Details of the Researcher

PHOTO

Takeru Okada
Section
Graduate School of Engineering
Job title
Associate Professor
Degree

  • 博士（工学）（東北大学）

  • 修士（理学）（東北大学）

Professional Memberships 3

  • 応用物理学会

    2003 - Present

  • Materials Research Society

  • フラーレン・ナノチューブ・グラフェン学会

Research Areas 1

  • Nanotechnology/Materials / Nanomaterials /

Awards 5

  1. 講演奨励賞

    2021/01　2020年 応用物理学東北支部　グラフェン上における液体流動発電の出力密度定量

  2. 2次元半導体シートと液相界面の新規動電現象の発現・機構解明と発電デバイスの開発

    2019/11　一般財団法人石田實記念財団

  3. 講演奨励賞

    2017/03　第64回応用物理学会春季学術講演会　ナノ電気化学セル顕微鏡によるグラフェン/グラファイト構造における電気化学活性の局所電気化学測定と可視化

  4. 応用物理学会プラズマエレクトロニクス分科会 第7回プラズマエレクトロニクス賞

    2009/03　応用物理学会プラズマエレクトロニクス分科会

  5. 日本電気学会優秀発表賞

    2007/08　日本電気学会

Papers 96

  1. Photocatalytic decomposition of methylene blue using a zinc–tungsten oxide compound prepared by co-sputtering and calcination International-journal Peer-reviewed

    Sho Kakuta, Kosuke TAKENAKA, makoto Takahashi, Yuichi Setsuhara, Takeru Okada

    Japanese Journal of Applied Physics　64　04SP07-1-04SP07-5　2025/03/17

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/adc139 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract In this study, we investigated the formation and photocatalytic activity of ZnWO4/WO3 bilayer-like composites prepared by co-sputtering and calcination. The tungsten-doping concentration affects crystal formation and photoluminescence, and transmission electron microscopy revealed that WO3 forms an underlying layer of ZnWO4, forming a bilayer-like structure at high tungsten concentrations. We attribute the formation of this bilayer to segregation during deposition, and we found it to have effective photocatalytic activity for the degradation of methylene blue by hetero junction formation.

  2. Investigating the correlation between flow dynamics and flow-induced voltage generation International-journal Peer-reviewed

    Hikaru Takeda, Naoya Iwamoto, Mitsuhiro Honda, Masaki Tanemura, Ichiro Yamashita, Atsuki Komiya, Takeru Okada

    Applied Physics Letters　125　(18)　2024/10/28

    Publisher: AIP Publishing

    DOI： 10.1063/5.0230115 　

    ISSN： 0003-6951

    eISSN： 1077-3118

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    The conversion of water current to voltage generation through graphene has gained interest in both basic physics and applications such as sensors and electricity generation systems. However, many aspects of the mechanism remain unclear. Recently, quantum-based momentum transfer theories have been reported, but these often do not account for flow conditions. In this study, we investigated the correlation between the flow conditions of a liquid medium and the electrical conduction of graphene through experiments and numerical calculations. Our results suggest that the necessary condition is that the flow must be neither irregular nor purely laminar; instead, graphene responds to the transition process of the fluid. This finding supports the extension of current theories and presents valuable insights for both basic science and industrial applications.

  3. Comprehensive electrochemical imaging analyses of redox activities correlated to multilayer graphene and graphite structures Peer-reviewed

    Akichika Kumatani, Chiho Miura, Hiroki Ida, Yasufumi Takahashi, Yuichi Ikuhara, Hitoshi Shiku, Tomokazu Matsue, Takeru Okada

    Electrochimica Acta　144688-144688　2024/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.electacta.2024.144688 　

    ISSN： 0013-4686

  4. Electrochemical catalysis of aluminum diboride thin film fabricated by radio-frequency magnetron sputtering Peer-reviewed

    Kazuki Nashimoto, Yoshiko Horiguchi, Akichika Kumatani, Takeru Okada

    Japanese Journal of Applied Physics　2024/03/04

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ad2fde 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract This study explores a novel ambient-condition method as a potential alternative to the Haber-Bosch process for ammonia synthesis. Aluminum diborides thin films were deposited using sputtering and calcination techniques to investigate the relationship between crystallinity and various properties including electrochemical catalysis, electrical conductivity, surface morphology, and bonding states. The results indicate that the calcined films reduce the electrical resistivity and exhibit enhanced crystallinity, and catalytic activity, particularly for ammonia synthesis. The findings highlight the significant impact of crystallinity on electrocatalysis in this context.

  5. Formation of ZnWO4/WO3 composite film by RF magnetron sputtering and calcination International-journal Peer-reviewed

    Sho Kakuta, Takeru Okada

    Journal of Vacuum Science & Technology A　42　(1)　2024/01/01

    Publisher: American Vacuum Society

    DOI： 10.1116/6.0003180 　

    ISSN： 0734-2101

    eISSN： 1520-8559

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    This study demonstrates the formation of ZnWO4/WO3 composite that are engendered by cosputtering deposition followed by calcination. The concentrations of the tungsten dopant are found to have a profound effect on crystal formation, composition, and photoluminescence. The quantum efficiency measurements investigating different excitation light directions indicate that WO3 can form an underlayer of ZnWO4 at high dopant concentrations. The formation of bilayerlike films is caused by segregation, resulting from time evolution of sputtering yield due to temperature changes at the surface of the sputtering target.

  6. Zeta potential variations in bonding states of fluorocarbon films deposited by plasma-enhanced chemical vapor deposition Peer-reviewed

    Toru Takeya, Huanwen Han, Ichiro Yamashita, Takeru Okada

    Japanese Journal of Applied Physics　62　(SL)　SL1007-SL1007　2023/05/09

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/accde7 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract The interactions between a solid and a liquid at their interface often produce exotic effects that could be used in energy-related applications. To this end, understanding which properties control the zeta potentials at the interface promises to advance the application of these effects. In this study, we fabricated fluorocarbon films by plasma-enhanced CVD to investigate the interaction of the film with an aqueous solution. We found that the properties of the films can be controlled by the deposition pressure, and the zeta potential correlates with the bonding states within the films. The control of the interfacial potential between the solid material and the aqueous solution can be a factor in maximizing energy output and optimizing device design.

  7. Comparative Study on Formation of Boride Thin Films Deposited by Co-sputtering with Molybdenum

    Kazuki Nashimoto, Yoshiko Horiguchi, Akichika Kumatani, Takeru Okada

    Proceedings of ICRP-11/GEC2022　HW6.00108　2022/10

  8. Investigation of optical property of tungsten-doped zinc oxide films deposited by sputtering

    Sho Kakuta, Takeru Okada, Katsuyoshi Washio

    Proceedings of ICRP-11/GEC2022　HW6.00105　2022/10

  9. Investigation of Material Properties of Fluorocarbon Films Deposited by Plasma-Enhanced Chemical Vapor Deposition

    Toru Toru, Takeru Okada

    Proceedings of ICRP-11/GEC2022　HT4.00078　2022/10

  10. A comparative study of the antibacterial properties of copper-based transparent oxides at the solid–liquid interface Peer-reviewed

    Takeru Okada, Kotaro Ohno, Makoto Kanzaki, Katsuyoshi Washio

    Japanese Journal of Applied Physics　61　(10)　108001-108001　2022/09/27

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ac9169 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract This study investigates the antibacterial properties of CuCrO2 (CCO) films fabricated by sputter deposition followed by calcination. The effects of the doped magnesium and the film fabrication in nitrogen atmosphere on both CCO crystallinity and antibacterial properties are compared. The antibacterial properties are evaluated using the plate counting method, and the crystallinity of the films are analyzed by X-ray diffraction. The results show the proliferation of Escherichia coli colonies that can be suppressed within 3 h, with magnesium-doped CCO showing the best antibacterial properties of all samples. This is explained by the formation of CuO byproduct during fabrication.

  11. Synergy effects of Al-V-co-doping and oxygen reactive sputtering on electrical and optical properties of ZnO films International-journal Peer-reviewed

    Takeru Okada, Chisato Tateyama, Kotaro Hoshino, Tomoyuki Kawashima, Katsuyoshi Washio

    Japanese Journal of Applied Physics　60　(3)　035503-035503　2021/03/01

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/abe2b8 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  12. Aluminum and vanadium co-doping effects on the optical and electrical properties of oriented ZnO films International-journal Peer-reviewed

    Takeru Okada, Chisato Tateyama, Kotaro Hoshino Tomoyuki Kawashima, Katsuyoshi Washio

    Materials Research Express　8　(1)　016402-016402　2021/01/07

    Publisher: IOP Publishing

    DOI： 10.1088/2053-1591/abd5d8 　

    eISSN： 2053-1591

  13. Investigation of crystallinity, electrical conductivity, and optical transmittance of Mg-doped CuCrO2 deposited on buffer layer International-journal Peer-reviewed

    Takeru Okada, Shoya Usui, Tomoyuki Kawashima, Katsuyoshi Washio

    Materials Science in Semiconductor Processing　134　106030-106030　2021

    Publisher: Elsevier BV

    DOI： 10.1016/j.mssp.2021.106030 　

    ISSN： 1369-8001

  14. Effect of forming gas annealing on improvement in crystal orientation of solid-phase calcined CuCrO2 thin film International-journal Peer-reviewed

    Kotaro Ohno, Takeru Okada, Tomoyuki Kawashima, Katsuyoshi Washio

    Thin Solid Films　714　138386-138386　2020/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.tsf.2020.138386 　

    ISSN： 0040-6090

  15. Output density quantification of electricity generation by flowing deionized water on graphene International-journal International-coauthorship Peer-reviewed

    Kei Kuriya, Kotaro Ochiai, Golap Kalita, Masaki Tanemura, Atsuki Komiya, Gota Kikugawa, Taku Ohara, Ichiro Yamashita, Fumio S. Ohuchi, M. Meyyappan, Seiji Samukawa, Katsuyoshi Washio, Takeru Okada

    Applied Physics Letters　117　(12)　123905-123905　2020/09/21

    Publisher: AIP Publishing

    DOI： 10.1063/5.0018862 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  16. Effects of ZnO buffer layers on growth, electrical properties and crystallinity of vanadium-doped ZnO Peer-reviewed

    Takeru Okada, Tomoyuki Kawashima, Tatsuya Mori, Katsuyoshi Washio

    Thin Solid Films　701　137954-137954　2020/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.tsf.2020.137954 　

    ISSN： 0040-6090

  17. Neutral Beam Aided Surface Modification for Controlling Triboelectric Behavior

    Wook Kim, Takeru Okada, Seiji Samukawa, Dukhyun Choi

    Lecture Notes in Electrical Engineering　346-350　2019/08/31

    Publisher: Springer Singapore

    DOI： 10.1007/978-981-32-9437-0_38 　

    ISSN： 1876-1100

    eISSN： 1876-1119

  18. Controlling Nitrogen Dose Amount in Atmospheric-Pressure Plasma Jet Nitriding Peer-reviewed

    Ryuta Ichiki, Masayuki Kono, Yuka Kanbara, Takeru Okada, Tatsuro Onomoto, Kosuke Tachibana, Takashi Furuki, Seiji Kanazawa

    Metals　9　(6)　714-714　2019/06/25

    Publisher: MDPI AG

    DOI： 10.3390/met9060714 　

    eISSN： 2075-4701

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    A unique nitriding technique with the use of an atmospheric-pressure pulsed-arc plasma jet has been developed to offer a non-vacuum, easy-to-operate process of nitrogen doping to metal surfaces. This technique, however, suffered from a problem of excess nitrogen supply due to the high pressure results in undesirable formation of voids and iron nitrides in the treated metal surface. To overcome this problem, we have first established a method to control the nitrogen dose amount supplied to the steel surface in the relevant nitriding technique. When the hydrogen fraction in the operating gas of nitrogen/hydrogen gas mixture increased from 1% up to 5%, the nitrogen density of the treated steel surface drastically decreased. As a result, the formation of voids were suppressed successfully. The controllability of the nitrogen dose amount is likely attributable to the density of NH radicals existing in the plume of the pulsed-arc plasma jet.

  19. Effects of nitrogen-dopant bonding states on liquid-flow-induced electricity generation of graphene: A comparative study International-journal Peer-reviewed

    Takeru Okada, Golap Kalita, Masaki Tanemura, Ichiro Yamashita, Fumio S. Ouchi, M. Meyyappan, Seiji Samukawa

    Results in Physics　12　1291-1293　2019/03

    DOI： 10.1016/j.rinp.2019.01.023 　

    ISSN： 2211-3797

  20. Surface modification of triboelectric materials by neutral beams Peer-reviewed

    Wook Kim, Takeru Okada, Hyun-Woo Park, Jihye Kim, Sungsoo Kim, Sang-Woo Kim, Seiji Samukawa, Dukhyun Choi

    Journal of Materials Chemistry A　7　(43)　25066-25077　2019

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/c9ta09990e 　

    ISSN： 2050-7488

    eISSN： 2050-7496

  21. Role of Doped Nitrogen in Graphene for Flow-Induced Power Generation International-journal Peer-reviewed

    Takeru Okada, Golap Kalita, Masaki Tanemura, Ichiro Yamashita, M. Meyyappan, Seiji Samukawa

    Advanced Engineering Materials　20　(11)　1800387-1800387　2018/11

    DOI： 10.1002/adem.201800387 　

    ISSN： 1438-1656

  22. Nanoscale Electrochemical Imaging of Aligned Semiconducting and Metallic Single-Walled Carbon Nanotube Bundles

    Akichika Kumatani, Takeru Okada, Takahashi Yasufumi, Miyu Shimura, Hitoshi Shiku, Seiji Samukawa, Tomokazu Matsue

    ECS Meeting Abstracts　{MA}2018-02　(9)　564-564　2018/07/23

    Publisher: The Electrochemical Society

    DOI： 10.1149/ma2018-02/9/564 　

    ISSN： 2151-2043

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    <jats:p> Carbon nanotubes have been studied in the variety of research fields from electronic devices to energy harvesting applications [1]. In general, their unique properties come from their ideal one-dimensional structure and tremendous metallic or semiconducting behavior depending upon their chirality. For energy application, it is an important issue to develop a good separation technique for the metallic and semiconducting single-walled carbon nanotubes (SWNTs) in large volume and to understand their electrochemical activities of both types of nanotubes. Recent progress for separation between metallic and semiconducting of has been developed. For example, a gel-based separation technique reported by Tanaka and co-workers [2]. Also, Unwin’s group has revealed the electrochemical activities for each type of the individual SWNT by scanning electrochemical cell microscopy [3]. </jats:p> <jats:p>In this study, we have at first created aligned SWNT bundles by dielectrophoresis [4] using by the commercially available suspension created by a gel separation technique. The aligned nanotube samples were prepared from either semiconducting or metallic nanotube suspension. Then, scanning electrochemical cell microscopy with a single-barrel nanopipette [5] was applied to each sample for the detection of the existence of the other property of the nanotube, referring to the difference in electrochemical activities between semiconducting and metallic nanotubes [3]. </jats:p> <jats:p>[1] M. F. L. De Volder et al., Science 339, 535, (2013). [2] T. Tanaka et al., Nano Lett. 9, 1497 (2009). [3] A. G. Guel et al., Nano Lett., 14, 220 (2014). [4] R. Krupke et al., Science 301, 344 (2003). [5] Y. Takahashi et al. Nat. Comm. 5:6450 (2014). </jats:p>

  23. Low-temperature InGaAs oxidation using oxygen neutral beam Peer-reviewed

    Chang-Yong Lee, Akio Higo, Cédric Thomas, Takeru Okada, Takuya Ozaki, Masakazu Sugiyama, Yoshiaki Nakano, Seiji Samukawa

    Japanese Journal of Applied Physics　57　(7)　070305-070305　2018/07/01

    DOI： 10.7567/jjap.57.070305 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  24. Energy control of neutral oxygen particles passing through an aperture electrode Peer-reviewed

    Takeo Ohno, Daiki Nakayama, Takeru Okada, Seiji Samukawa

    Results in Physics　8　169-171　2018/03/01

    DOI： 10.1016/j.rinp.2017.12.001 　

    ISSN： 2211-3797

  25. Nitrogen doping effect on flow-induced voltage generation from graphene-water interface Peer-reviewed

    Takeru Okada, Golap Kalita, Masaki Tanemura, Ichiro Yamashita, M. Meyyappan, Seiji Samukawa

    Applied Physics Letters　112　(2)　023902-023902　2018/01/08

    DOI： 10.1063/1.5007273 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  26. Room-Temperature Synthesis of GaN Driven by Kinetic Energy beyond the Limit of Thermodynamics Peer-reviewed

    Takane Imaoka, Takeru Okada, Seiji Samukawa, Kimihisa Yamamoto

    ACS Applied Materials and Interfaces　9　(48)　41629-41633　2017/12/06

    DOI： 10.1021/acsami.7b13694 　

    ISSN： 1944-8252 1944-8244

    eISSN： 1944-8252

  27. Fabrication of germanium nanodisk array by neutral beam etching with protein as etching mask Peer-reviewed

    Takuya Fujii, Takeru Okada, Taiga Isoda, Mohd Erman Syazwan, Mohamed-Tahar Chentir, Kohei M. Itoh, Ichiro Yamashita, Seiji Samukawa

    Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena　35　(2)　021801-021801　2017/03

    DOI： 10.1116/1.4976524 　

    ISSN： 2166-2746

    eISSN： 2166-2754

  28. Effect of flux and energy of hydrogen neutral beam on hydrogenation process of graphene Peer-reviewed

    T. Okada, C. Thomas, M. Meyyappan, S. Samukawa

    16th International Conference on Nanotechnology - IEEE NANO 2016　297-298　2016/11/21

    DOI： 10.1109/NANO.2016.7751304 　

  29. Bonding state and defects of nitrogen-doped graphene in oxygen reduction reaction Peer-reviewed

    Takeru Okada, Kumi Y. Inoue, Golap Kalita, Masaki Tanemura, Tomokazu Matsue, M. Meyyappan, Seiji Samukawa

    Chemical Physics Letters　665　117-120　2016/11/16

    DOI： 10.1016/j.cplett.2016.10.061 　

    ISSN： 0009-2614

    eISSN： 1873-4448

  30. Investigation of carbon-nitrogen bonding state in graphene on catalytic activity

    T. Okada, K. Y. Inoue, T. Matsue, G. Kalita, M. Tanemura, M. Meyyappan, S. Samukawa

    17th International Conference on the science and technology nanotubes and low-dimensional materials　2016/08

  31. Formation of Ge oxide film by neutral beam postoxidation using Al metal film Peer-reviewed

    Takeo Ohno, Daiki Nakayama, Takeru Okada, Seiji Samukawa

    JAPANESE JOURNAL OF APPLIED PHYSICS　55　(4)　04EJ03-04EJ03　2016/04

    DOI： 10.7567/JJAP.55.04EJ03 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  32. Selective in-plane nitrogen doping of graphene by an energy-controlled neutral beam International-journal Peer-reviewed

    Takeru Okada, Seiji Samukawa

    Nanotechnology　26　(48)　485602-485602　2015/11/12

    DOI： 10.1088/0957-4484/26/48/485602 　

    ISSN： 1361-6528 0957-4484

    eISSN： 1361-6528

  33. Effects of Flux and Energy of Neutral Beam on Hydrogenation of Graphene Peer-reviewed

    Takeru Okada, Seiji Samukawa

    9th International Conference on Reactive Plasmas / 68th Gaseous Electronics Conference / 33rd Symposium on Plasma Processing　2015/10/16

  34. Etching of GaAs materials by chlorine neutral beam for quantum nanodisks fabrication Peer-reviewed

    Cedric Thomas, Akio Higo, Takeru Okada, Seiji Samukawa

    9th International Conference on Reactive Plasmas / 68th Gaseous Electronics Conference / 33rd Symposium on Plasma Processing　2015/10/16

  35. Single carbon nanotube-based reversible regulation of biological motor activity Peer-reviewed

    Yuichi Inoue, Mitsunori Nagata, Hiroshi Matsutaka, Takeru Okada, Masaaki K. Sato, Akihiko Ishijima

    ACS Nano　9　(4)　3677-3684　2015/04/28

    DOI： 10.1021/nn505607c 　

    ISSN： 1936-086X 1936-0851

    eISSN： 1936-086X

  36. Selective nitrogen doping of graphene by energy-controlled neutral beam International-journal Peer-reviewed

    Takeru Okada, Seiji Samukawa

    IEEE-NANO 2015 - 15th International Conference on Nanotechnology　1247-1249　2015

    DOI： 10.1109/NANO.2015.7388856 　

  37. Effect of miniband formation in a quantum dot super lattice fabricated by combination of bio-template and neutral beam etching for high efficiency quantum dot solar cells Peer-reviewed

    Mohammad Maksudur Rahman, Makoto Igarashi, Weiguo Hu, Mohd Erman Syazwan, Takeru Okada, Yusuke Hoshi, Noritaka Usami, Seiji Samukawa

    2014 IEEE 40th Photovoltaic Specialist Conference, PVSC 2014　1092-1095　2014/10/15

    DOI： 10.1109/PVSC.2014.6925105 　

  38. Germanium nano disk array fabrication by combination of bio template and neutral beam etching for solar cell application Peer-reviewed

    Takuya Fujii, Takeru Okada, Mohd Erman Syazwan, Taiga Isoda, Hirotaka Endo, Mohammad Maksudur Rahman, Kohei Ito, Seiji Samukawa

    2014 IEEE 40th Photovoltaic Specialist Conference, PVSC 2014　1033-1036　2014/10/15

    DOI： 10.1109/PVSC.2014.6925090 　

  39. Fabrication of Two-Dimensional 10 nm Graphene Dot Array and Optical Characterization International-journal Peer-reviewed

    T. Okada, K. Igarashi, P. Han, T. Hitosugi, C.H. Huang, C.Y. Su, S. Samukawa

    Extended Abstracts of the 2014 International Conference on Solid State Devices and Materials　2014/09/09

    Publisher: The Japan Society of Applied Physics

    DOI： 10.7567/ssdm.2014.h-2-4 　

  40. Estimation of activation energy and surface reaction mechanism of chlorine neutral beam etching of GaAs for nanostructure fabrication Peer-reviewed

    C. Thomas, Y. Tamura, T. Okada, A. Higo, S. Samukawa

    Journal of Physics D: Applied Physics　47　(27)　275201-275201　2014/07/09

    DOI： 10.1088/0022-3727/47/27/275201 　

    ISSN： 1361-6463 0022-3727

    eISSN： 1361-6463

  41. Bio-Template and Neutral Beam Etching Technique applied for Germanium Nanowires Fabrication Peer-reviewed

    Moahmed-Tahar Chentir, Takeru Okada, Naoyuki Kawai, Kazumi Wada, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  42. Development of damage-free neutral beam processes for future nano-devices Peer-reviewed

    Takuya Ozaki, Takeru Okada, Tomohiro Kubota, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  43. Fabrication of High Density Sub-10nm Germanium Nanodisk Array Using Bio-template and Neutral Beam Etching for Solar Cell Application Peer-reviewed

    Takuya Fujii, Takeru Okada, Mohd Erman Syazwan, Taiga Isoda, Hirotaka Endo, Mohammad, Maksudur Rahman, Kohei Ito, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  44. Fundamental mechanisms of neutral beam etching for III-V quantum dots fabrication Peer-reviewed

    Cedric Thomas, Yosuke Tamura, Takeru Okada, Akio Higo, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  45. GaAs/AlGaAs quantum nanodisks by using neutral beam etching and their optical response Peer-reviewed

    Yosuke Tamura, Akio Higo, Takayuki Kiba, Cedric Thomas, Takeru Okada, Wang Yunpeng, Hassanet Sodabanlu, Masakazu Sugiyama, Yoshiaki Nakano, Akihiro Murayama, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  46. Graphene dots fabrication by a bio-template and a neutral beam etching Peer-reviewed

    Koki Igarashi, Takeru Okada, Patrick Han, Katsuaki Sugawara, Taro Hitosugi, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  47. Neutral beam induced nitridation of multi-layer graphene International-journal Peer-reviewed

    Takeru Okada, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  48. Damage-free AlGaN/GaN Recess-Gate Etching using Cl2 Neutral Beam for High-Performance HEMTs Peer-reviewed

    Halubai Sekhar, Tomohiro Kubota, Takeru Okada, Yosuke Tamura, ChangYong Lee, Jitsuo Ohta, Hiroshi Fujioka, Seiji Samukawa

    The 3rd International Symposiumon Next-Generation Electronics　2014/05

  49. Novel ArF photoresist polymer to suppress the formation of roughness in plasma etching processes Peer-reviewed

    Takuji Uesugi, Takeru Okada, Akira Wada, Keisuke Kato, Atsushi Yasuda, Shinichi Maeda, Seiji Samukawa

    Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films　31　(6)　061301-061301　2013/11

    DOI： 10.1116/1.4815829 　

    ISSN： 0734-2101

    eISSN： 1520-8559

  50. Ultra-low Damage Fabrication of Graphene Nanoribbons by Neutral Beam Etching Peer-reviewed

    T. Okada, C.Y. Su, C.H. Huang, K. Igarashi, A. Wada, L.J. Li, K.I. Ho, P.W. Li, I.H. Chen, C.S. Lai, S. Samukawa

    Extended Abstracts of the 2013 International Conference on Solid State Devices and Materials　2013/09/26

    Publisher: The Japan Society of Applied Physics

    DOI： 10.7567/ssdm.2013.c-4-3 　

  51. Ultra-low-edge-defect graphene nanoribbons patterned by neutral beam International-journal Peer-reviewed

    Chi-Hsien Huang, Ching-Yuan Su, Takeru Okada, Lain-Jong Li, Kuan-I Ho, Pei-Wen Li, Inn-Hao Chen, Chien Chou, Chao-Sung Lai, Seiji Samukawa

    Carbon　61　229-235　2013/09

    DOI： 10.1016/j.carbon.2013.04.099 　

    ISSN： 0008-6223

    eISSN： 1873-3891

  52. Novel ArF photoresist polymer to suppress the roughness formation in plasma etching processes Peer-reviewed

    Keisuke Kato, Atsushi Yasuda, Shin-ichi Maeda, Takuji Uesugi, Takeru Okada, Akira Wada, Seiji Samukawa

    Advances in Resist Materials and Processing Technology XXX　2013/03/29

    DOI： 10.1117/12.2011096 　

    ISSN： 0277-786X

  53. Damage-less graphene etching by oxygen neutral beam for graphene nanoribbon fabrication Peer-reviewed

    Akira Wada, Koki Igarashi, Takeru Okada, Seiji Samukawa

    Proceedings of the IEEE Conference on Nanotechnology　917-920　2013

    DOI： 10.1109/NANO.2013.6720888 　

    ISSN： 1944-9399 1944-9380

  54. Dependence of polymer main-chain structure on roughness formation of ArF photoresists in the plasma etching processes Peer-reviewed

    Takuji Uesugi, Takeru Okada, Akira Wada, Keisuke Kato, Atsushi Yasuda, Shinichi Maeda, Seiji Samukawa

    Journal of Physics D: Applied Physics　45　(9)　095201-095201　2012/03/07

    DOI： 10.1088/0022-3727/45/9/095201 　

    ISSN： 0022-3727 1361-6463

    eISSN： 1361-6463

  55. The effects of polymer side-chain structure on roughness formation of ArF photoresist in plasma etching processes Peer-reviewed

    Takuji Uesugi, Takeru Okada, Akira Wada, Keisuke Kato, Atsushi Yasuda, Shinichi Maeda, Seiji Samukawa

    Journal of Physics D: Applied Physics　45　(7)　075203-075203　2012/02/22

    DOI： 10.1088/0022-3727/45/7/075203 　

    ISSN： 0022-3727 1361-6463

    eISSN： 1361-6463

  56. 1A1412 Thermal response of myosin motors on single carbon nanotubes(Molecular Motors I,Oral Presentation,The 50th Annual Meeting of the Biophysical Society of Japan)

    Nagata Mitsunori, Matsutaka Hiroshi, Okada Takeru, Ishijima Akihiko, Inoue Yuichi

    Seibutsu Butsuri　52　S19　2012

    Publisher: The Biophysical Society of Japan General Incorporated Association

    DOI： 10.2142/biophys.52.S19_2 　

  57. 3M1322 Local heating of myosin motors using single carbon nanotubes(Molecular motor5,The 49th Annual Meeting of the Biophysical Society of Japan)

    Nagata Mitsunori, Matsutaka Hiroshi, Inoue Yuichi, Okada Takeru, Ishijima Akihiko

    Seibutsu Butsuri　51　S152　2011

    Publisher: The Biophysical Society of Japan General Incorporated Association

    DOI： 10.2142/biophys.51.S152_4 　

  58. 3P334 Direct Observation of Carbon Nanotubes in Solution by Surfactant-terminated Fluorescent Labeling(Bioimaging,The 48th Annual Meeting of the Biophysical Society of Japan)

    Matsutaka Hiroshi, Okada Takeru, Inoue Yuichi, Fukuoka Hajime, Khan Shahbaz, Yoshimura Shige H., Ishijima Akihiko

    Seibutsu Butsuri　50　(2)　S204　2010

    Publisher: The Biophysical Society of Japan General Incorporated Association

    DOI： 10.2142/biophys.50.S204_2 　

  59. DNA encapsulated single-walled carbon nanotubes formed by DNA ion irradiation in electrolyte plasmas Peer-reviewed

    R. Hatakeyama, T. Okada, T. Kaneko

    4th Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices, FNANO 2007　273-277　2007/12

  60. Conversion of toluene into carbon nanotubes using arc discharge plasmas in solution Peer-reviewed

    T. Okada, T. Kaneko, R. Hatakeyama

    Thin Solid Films　515　(9)　4262-4265　2007/03/12

    DOI： 10.1016/j.tsf.2006.02.067 　

    ISSN： 0040-6090

  61. Investigation of gas-liquid interface in atmospheric-pressure micro plasma with solution Peer-reviewed

    Kazuhiko Baba, Takeru Okada, Toshiro Kaneko, Rikizo Hatakeyama, Hiroyuki Yoshiki

    Thin Solid Films　515　(9)　4308-4311　2007/03/12

    DOI： 10.1016/j.tsf.2006.02.090 　

    ISSN： 0040-6090

  62. Negative differential resistance in tunneling transport through C-60 encapsulated double-walled carbon nanotubes Peer-reviewed

    Y. F. Li, R. Hatakeyama, T. Kaneko, T. Kato, T. Okada

    APPLIED PHYSICS LETTERS　90　(7)　073106-073106　2007/02

    DOI： 10.1063/1.2535817 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  63. DNA encapsulation inside carbon nanotubes using micro electrolyte plasmas Peer-reviewed

    T. Kaneko, T. Okada, R. Hatakeyama

    Contributions to Plasma Physics　47　(1-2)　57-63　2007

    DOI： 10.1002/ctpp.200710009 　

    ISSN： 0863-1042 1521-3986

    eISSN： 1521-3986

  64. Encapsulation of Biomolecules into Single-Walled Carbon Nanotubes Using Electrolyte Plasmas Peer-reviewed

    T. Kaneko, T. Okada, Y. Hirotsu, R. Hatakeyama

    Proceedings of 18th International Symposium on Plasma Chemistry　27P-136　2007

  65. Formation of C60- Encapsulated Double-Walled Carbon Nanotubes  with Novel Electrical Transport Properties Based on Plasma  Technology Peer-reviewed

    LI Yongfeng, HATAKEYAMA Rikizo, KANEKO Toshiro, KATO Toshiaki, OKADA Takeru

    Plasma and Fusion Research　2　017-17　2007

    Publisher: The Japan Society of Plasma Science and Nuclear Fusion Research

    DOI： 10.1585/pfr.2.017 　

    ISSN： 1880-6821

    More details Close

    The encapsulation of C60 molecules inside double-walled carbon nanotubes (DWNTs) is realized by means of a plasma ion-irradiation method. Transmission electron microscopy observations confirm that DWNTs have been filled with C60 fullerenes having amorphous morphology. More importantly, electrical transport measurements indicate that C60-encapsulated metallic DWNTs exhibit a novel negative differential resistance behavior.

  66. Growth of vertically aligned carbon nanotube bundles using atmospheric-pressure microplasma Peer-reviewed

    Hiroyuki Yoshiki, Takeru Orada, Kazuhiko Hirai, Rikizo Hatakeyama

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　45　(12)　9276-9279　2006/12/15

    DOI： 10.1143/JJAP.45.9276 　

    ISSN： 0021-4922 1347-4065

    eISSN： 1347-4065

  67. Atmospheric pressure glow-discharge plasmas with gas-liquid interface Peer-reviewed

    Kazuhiko Baba, Takeru Okada, Toshiro Kaneko, Rikizo Hatakeyama

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　45　(10 B)　8286-8289　2006/10/21

    DOI： 10.1143/JJAP.45.8286 　

    ISSN： 0021-4922 1347-4065

    eISSN： 1347-4065

  68. Single-stranded DNA insertion into single-walled carbon nanotubes by ion irradiation in an electrolyte plasma Peer-reviewed

    Takeru Okada, Toshiro Kaneko, Rikizo Hatakeyama

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　45　(10 B)　8335-8339　2006/10/21

    DOI： 10.1143/JJAP.45.8335 　

    ISSN： 0021-4922 1347-4065

    eISSN： 1347-4065

  69. Modification of double-walled carbon nanotubes by Cs plasma ion irradiation Peer-reviewed

    Yongfeng Li, Takeshi Izumida, Takeru Okada, Toshiaki Kato, Rikizo Hatakeyama, Jieshan Qiu

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　45　(10B)　8330-8334　2006/10

    DOI： 10.1143/JJAP.45.83301 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  70. Synthesis and electronic properties of ferrocene-filled double-walled carbon nanotubes Peer-reviewed

    Y. F. Li, R. Hatakeyama, T. Kaneko, T. Izumida, T. Okada, T. Kato

    Nanotechnology　17　(16)　4143-4147　2006/08/28

    DOI： 10.1088/0957-4484/17/16/025 　

    ISSN： 0957-4484 1361-6528

    eISSN： 1361-6528

  71. Synthesis of Cs-filled double-walled carbon nanotubes by a plasma process Peer-reviewed

    Yongfeng Li, Rikizo Hatakeyama, Takeru Okada, Toshiaki Kato, Takeshi Izumida, Takamichi Hirata, Jieshan Qiu

    Carbon　44　(8)　1586-1589　2006/07

    DOI： 10.1016/j.carbon.2006.02.012 　

    ISSN： 0008-6223

  72. Investigation of Gas-Liquid Interface in Microplasmas Contacting with Solvent Peer-reviewed

    K. Hirai, T. Okada, T. Kato, T. Kaneko, R. Hatakeyama

    Proceedings of 3rd International Workshop on Microplasmas　86　2006/05

  73. Nano Sized Magnetic Particles with Diameters Less than 1 nm Encapsulated in Single-Walled Carbon Nanotubes Peer-reviewed

    Yongfeng Li, Rikizo Hatakeyama, Toshiro Kaneko, Takeru Okada

    Japanese Journal of Applied Physics　45　(No. 15)　L428-L431　2006/04/07

    DOI： 10.1143/jjap.45.l428 　

    ISSN： 0021-4922

  74. Electrically triggered insertion of single-stranded DNA into single-walled carbon nanotubes Peer-reviewed

    Takeru Okada, Toshiro Kaneko, Rikizo Hatakeyama, Kazuyuki Tohji

    Chemical Physics Letters　417　(4-6)　288-292　2006/01/10

    DOI： 10.1016/j.cplett.2005.10.030 　

    ISSN： 0009-2614

  75. Electrical properties of ferromagnetic semiconducting single-walled carbon nanotubes Peer-reviewed

    Y. F. Li, R. Hatakeyama, T. Kaneko, T. Izumida, T. Okada, T. Kato

    Applied Physics Letters　89　(8)　083117-083117　2006

    DOI： 10.1063/1.2337872 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  76. Electronic transport properties of Cs-encapsulated double-walled carbon nanotubes Peer-reviewed

    Y. F. Li, R. Hatakeyama, T. Kaneko, T. Izumida, T. Okada, T. Kato

    Applied Physics Letters　89　(9)　093110-093110　2006

    DOI： 10.1063/1.2339931 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  77. Conversion of Hydrocarbon Solvents into Carbon-Based Nanomaterials Using an Atmospheric Arc Discharge Plasma in Liquid Peer-reviewed

    T. Okada, T. Kaneko, R. Hatakeyama

    Proceedings of the 6th International Conference on Reactive Plasmas and 23rd Symposium on Plasma Processing (ICRP-6/SPP-23)　2006

  78. Gas-Liquid Interface of Glow Discharge Micro Plasma with Solvent Peer-reviewed

    K. Hirai, T. Okada, T. Kaneko, R. Hatakeyama, H. Yoshiki

    Proceedings of the 6th International Conference on Reactive Plasmas and 23rd Symposium on Plasma Processing (ICRP-6/SPP-23)　2006

  79. Synthesis of Functional Double-Walled Carbon Nanotubes using Plasma Method Peer-reviewed

    Y. F. Li, T. Okada, T. Kato, T. Izumida, R. Hatakeyama, J. Qiu

    Proceedings of the 6th International Conference on Reactive Plasmas and 23rd Symposium on Plasma Processing (ICRP-6/SPP-23)　2006

  80. Negative Ion Irradiation in Electlyte Plasma for the Formation of DNA Encapsulated Carbon Nanotubes Peer-reviewed

    T. Okada, T. Kaneko, R. Hatakeyama

    Proceedings of the 6th International Conference on Reactive Plasmas and 23rd Symposium on Plasma Processing (ICRP-6/SPP-23)　2006

  81. Formation of DNA Encapsulated Carbon Nanotubes by Control of Ion Species in Electrolyte Plasmas Peer-reviewed

    T. Okada, T. Kaneko, R. Hatakeyama

    Proceedings of the International Symposium on Bio- and Nano-Electronics　2006

  82. A Micro Plasma with Interfacial Region on Organic Solvent Peer-reviewed

    K. Hirai, T. Okada, T. Kaneko, R. Hatakeyama

    Proceedings of the International Symposium on Bio- and Nano-Electronics　2006

  83. DNA Encapsulation inside Carbon Nanotubes by Microplasmas Peer-reviewed

    R. Hatakeyama, T. Okada, T. Kaneko

    Proceedings of the 3rd International Workshop on Microplasma　2006

  84. Bio Applications of Micro Plasmas Peer-reviewed

    R. Hatakeyama, T. Okada, T. Kaneko

    Proceedings of the 2006 Annual Meeting Record I.E.E. Japan　2006

  85. DNA negative ion irradiation toward carbon nanotubes in micro electrolyte plasmas Peer-reviewed

    Takeru Okada, Toshiro Kaneko, Rikizo Hatakeyama

    Transactions of the Materials Research Society of Japan　31　(2)　459-462　2006

  86. Creation of Carbon Nanomaterials Based on Plasma Science and Future Prospects Invited Peer-reviewed

    R. Hatakeyama, T. Hirata, T. Okada, T. Kato, T. Izumida, W. Oohara, T. Kaneko

    Journal of The Institute of Engineers on Electrical Discharges in Japan　48　(2)　14-20　2005/02

  87. Development of a Plasma Source Using Atmospheric-Pressure Glow Discharge in Contact with Solution Peer-reviewed

    Kazuhiko HIRAI, Takeru OKADA, Toshiro KANEKO, Rikizo HATAKEYAMA, Hiroyuki YOSHIKI

    Journal of Plasma and Fusion Research　81　(6)　417-418　2005

    Publisher: Japan Society of Plasma Science and Nuclear Fusion Research

    DOI： 10.1585/jspf.81.417 　

    ISSN： 0918-7928

  88. Development of ARC discharge method, in organic solvents for the formation of DNA encapsulated carbon nanotubes Peer-reviewed

    Takeru Okada, Toshiro Kaneko, Rikizo Hatakeyama

    Novel Materials Processing by Advanced Electromagnetic Energy Sources　71-74　2005

    Publisher: Elsevier

    DOI： 10.1016/B978-008044504-5/50014-3 　

  89. Formation of Carbon Nanotubes Using Arc Discharge Plasmas in Organic Solvents as Carbon Sources Peer-reviewed

    T. Okada, T. Kaneko, R. Hatakeyama

    Proceedings of Plasma Science Symposium 2005 and the 22nd Symposium on Plasma Processing (PSS2005/SPP-22)　2005

  90. Generation of Atmospheric Pressure Plasma in Contact with Solution Peer-reviewed

    K. Hirai, T. Okada, T. Kaneko, R. Hatakeyama, H. Yoshiki

    Proceedings of Plasma Science Symposium 2005 and the 22nd Symposium on Plasma Processing (PSS2005/SPP-22)　2005

  91. Nanocarbon Formation Using Arc Discharge Plasma in Hydrocarbon Solvents as a Carbon Source Peer-reviewed

    T. Kaneko, T. Okada, R. Hatakeyama

    Proceedings of 27th International Conference on Phenomena in Ionized Gases　2005

  92. Investigation on the Generation of Atmospheric-Pressure Glow Discharge Plasmas in Contact with Solution Peer-reviewed

    K. Hirai, T. Okada, T. Kaneko, R. Hatakeyama, H. Yoshiki

    Proceedings of 27th International Conference on Phenomena in Ionized Gases　2005

  93. Nanocarbon formation by using arc discharge plasmas in DNA dispersed organic solvents

    T. Okada, T. Kaneko, R. Hatakeyama, K. Tohji

    Proceedings - Electrochemical Society　PV 2004-12　160-167　2004/12/01

  94. Fullerene negative ion irradiation toward double-walled carbon nanotubes using low energy magnetized plasma Peer-reviewed

    G.-H. Jeong, T. Okada, T. Hirata, R. Hatakeyama, K. Tohji

    Thin Solid Films　464-465　299-303　2004/10

    DOI： 10.1016/j.tsf.2004.06.001 　

    ISSN： 0040-6090

  95. The Formation of DNA Encapsulated Nanocarbons by Using Arc Discharge Plasmas in Organic Solvents Peer-reviewed

    T. Okada, T. Kaneko, R. Hatakeyama

    The 21st Symposium on Plasma Processing (SPP-21) Proceedings　2004

  96. Laser-induced molecular implantation at the focus of an objective lens: a comparative study among anthracene derivatives Peer-reviewed

    T. Okada, K. Hatanaka, J. Hobley, H. Fukumura, M. Kishimoto

    Technical Digest. CLEO/Pacific Rim 2001. 4th Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.01TH8557)　2001

    DOI： 10.1109/cleopr.2001.967724 　

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Misc. 12

  1. Synthesis of Magnetic Metal Encapsulated Carbon Nanotubes Using Arc Discharge Micro Plasmas in Liquid

    K. Uchida, T. Okada, K. Baba, T. Kaneko, R. Hatakeyama

    Abstracts of 4th International Workshop on Microplasmas　87-88　2007/10

  2. Formation of Ionic Liquids Encapsulated Single-Walled Carbon Nanotubes

    Y. Hirotsu, T. Okada, K. Baba, K. Uchida, T. Kaneko, R. Hatakeyama

    Abstracts of 4th International Workshop on Microplasmas　89-90　2007/10

  3. Construction of Bio-Devices Based on Nanoscopic Plasma Processes

    HIRATA Takamichi, HATAKEYAMA Rikizo, KANEKO Toshiro, OKADA Takeru, AKIYA Masahiro, SHIMATANI Yuichi, ICHIKI Takanori, AKAGI Takanori

    Journal of plasma and fusion research　83　(8)　647-657　2007/08/25

    Publisher: プラズマ・核融合学会

    ISSN： 0918-7928

  4. 液中プラズマを利用した新規内包ナノカーボン創製

    金子 俊郎, 馬場 和彦, 岡田 健, 畠山 力三

    12-19　2007/03

  5. Formation of Novel Structured Nanocarbons Using Arc Discharge Plasma in Liquid

    K. Uchida, T. Okada, K. Baba, T. Kaneko, R. Hatakeyama

    Abstracts of the 2nd International Symposium on Bio- and Nano-Electronics in Sendai　117-118　2006/12

  6. マイクロプラズマのDNA超分子システム創製への応用 (特集 マイクロプラズマ技術のナノ・バイオ材料工学への応用(Part2))

    畠山 力三, 岡田 健, 金子 俊郎

    機能材料　26　(6)　15-22　2006/06

    Publisher: シーエムシー出版

    ISSN： 0286-4835

  7. Insertion of DNA molecules into Carbon Nanotubes by Ion Irradiation in Electrolyte Plasmas

    T. Okada, T. Kaneko, R. Hatakeyama

    The Papers of Technical Meeting on Plasma Science and Technology, IEE Japan　PST-06　(24)　23-28　2006/01/13

  8. プラズマベースのナノカーボン材料の創製と展望 (特集 放電学会春季合同シンポジウム「未来を拓く放電技術」) -- (プラズマを用いたナノカーボン創製と応用)

    畠山 力三, 平田 孝道, 岡田 健

    放電研究　48　(2)　14-20　2005/05

    Publisher: 放電学会

    ISSN： 0911-8713

  9. 30aC03 Formation of DNA Encapsulated Carbon Nanotubes by Electric-Field-Induced DNA Negative Ion Irradiation in Electrolyte Plasma

    OKADA Takeru, KANEKO Toshiro, HATAKEYAMA Rikizo

    (22)　158-158　2005

    Publisher: プラズマ・核融合学会

  10. 02aB15P Atmospheric-Pressure Micro Plasma Source Using Mesh Electrode with Organic Solvent

    HIRAI Kazuhiko, OKADA Takeru, KANEKO Toshiro, HATAKEYAMA Rikizo

    (22)　251-251　2005

    Publisher: プラズマ・核融合学会

  11. 24aB07P Formation of Functional Carbon Nanotubes Using Arc Discharge Plasmas in Polymer Dispersed Solution

    OKADA Takeru, KANEKO Toshiro, HATAKEYAMA Rikizo

    (21)　153-153　2004

    Publisher: プラズマ・核融合学会

  12. 26aB22P Nano-Bio Fusion Research Using Novel Plasma : Formation of DNA Encapsulated Carbon Nanotubes

    OKADA Takeru, HATAKEYAMA Rikizo, KANEKO Toshiro, JEONG Goo-Hwan, YOSHIKI Hiroyuki

    (20)　136-136　2003

    Publisher: プラズマ・核融合学会

Show all ︎Show first 5

Books and Other Publications 3

  1. マイクロ・ナノプラズマ技術とその産業応用

    橘, 邦英, 寺嶋, 和夫

    シーエムシー出版　2006/12

    ISBN: 4882316579

  2. Novel materials processing by advanced electromagnetic energy sources (MAPEES'04) : Proceedings of the International Symposium on Novel Materials Processing by Advanced Electromagnetic Energy Sources, March 19-22, 2004, Osaka, Japan

    Miyake, S., Proceedings of the International Symposium on Novel Materials Processing

    Elsevier　2005

    DOI： 10.1016/B978-0-08-044504-5.X5000-4 　

    ISBN: 0080445047

  3. プラズマベースのカーボンナノ材料の創製と展望

    畠山 力三, 平田 孝道, 岡田 健, 加藤 俊顕, 泉田 健, 大原 渡, 金子 俊郎

    放電研究　2005

Presentations 79

  1. Correlation between Flow-induced Electricity Generation on Graphene and Flow Dynamics International-presentation

    T. Okada, M. Honda, M. Tanemura, I. Yamashita, A. Komiya

    The 25th International Conference on the Science and Applications of Nanotubes and Low-Dimensional Materials　2025/06/18

  2. Evaluation of Thermoelectric Effect on EMFs at a Water-Graphene Interface International-presentation

    N. Iwamoto, T. Okada, A. Komiya

    21st International Conference on Flow Dynamics　2024/11/19

  3. Formation of ZnWO4/WO3 composite by RF Magnetron Sputtering International-presentation

    S. Kakuta, K. Takenaka, Y. Setsuhara, T. Okada

    45th International Symposium on Dry Process　2024/11/15

  4. Electricity generation by interaction between graphene and fluid Invited

    T. Okada

    THERMEC‘2023　2023/07/03

  5. Comparative Study on Formation of Boride Thin Films Deposited by Co-sputtering with Molybdenum

    Kazuki Nashimoto, Yoshiko Horiguchi, Akichika Kumatani, Takeru Okada

    75th Annual Gaseous Electronics Conference / 11th International Conference on Reactive Plasmas　2022/10/05

  6. Investigation of optical property of tungsten-doped zinc oxide films deposited by sputtering

    Sho Kakuta, Takeru Okada, Katsuyoshi Washio

    75th Annual Gaseous Electronics Conference / 11th International Conference on Reactive Plasmas　2022/10/05

  7. Investigation of Material Properties of Fluorocarbon Films Deposited by Plasma-Enhanced Chemical Vapor Deposition

    Toru Takeya, Takeru Okada

    75th Annual Gaseous Electronics Conference / 11th International Conference on Reactive Plasmas　2022/10/04

  8. 水の流れがつくるグラフェンの電気伝導 Invited

    岡田 健

    第136回黒鉛化合物研究会　2022/06/24

  9. Bonding state selective doping of graphene and its application International-presentation Invited

    T. Okada

    Material Research Meeting 2021　2021/12/16

  10. Electricity generation from flowing water over graphene Invited

    Takeru Okada

    2021/10/18

  11. Energy harvesting application of water/graphene interface by elecctrokinetic phenomenon International-presentation International-coauthorship Invited

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, F.S. Ohuchi, M. Meyyappan, S. Samukawa

    Thermec'2021　2021/06/04

  12. Energy harvesting application of electrokinetic phenomenon an the solid-liquid interface Invited

    Takeru Okada

    Plasma forum　2020/02/19

  13. Electrokinetics at the Interface between Graphene and Moving Water Droplet International-presentation

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, F. S. Ohuchi, M. Meyyappan, S. Samukawa

    8th International Symposium on Control of Semiconductor Interfaces　2019/11/29

  14. Power Generation from the Interface between Graphene and Flowing Liquid Water International-presentation

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, F. S. Ohuchi, M. Meyyappan, S. Samukawa

    32nd International Microprocesses ad Nanotechnology Conference　2019/10/29

  15. Energy harvesting application of nitrogen-doped graphene International-presentation Invited

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, F.S. Ohuchi, M. Meyyappan, S. Samukawa

    12th International WorkShop on New Group IV Semiconductor Nanoelectronics, I-11　2018/12/07

  16. Electricity generation from interface between flowing water and graphene International-presentation

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, M. Meyyappan, S. Samukawa

    Materials Research Society 2018 Fall Meeting & Exhibit　2018/11/29

  17. Development of Low-Temperature Plasma Process for Nitride and Oxide Functional Films Formation International-presentation

    K. Takenaka, G. Uchida, Y. Setsuhara, T. Okada

    Fifteenth International Conference of Flow Dynamics　2018/11/08

  18. Nitrogen Doping to Narrow Holes by Atmospheric-Pressure Plasma Jet with Flow Induction International-presentation

    R. Ichiki, K. Toda, S. Akamine, S. Kanazawa, T. Okada

    Fifteenth International Conference of Flow Dynamics　2018/11/08

  19. Electricity generation by water flow on nitrogen-doped graphene International-presentation Invited

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, M. Meyyappan, S. Samukawa

    Fifteenth International Conference of Flow Dynamics　2018/11/07

  20. Power generation from moving water droplet on nitrogen doped graphene International-presentation

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, M. Meyyappan, S. Samukawa

    19th International Conference on the Science and Application of Nanotubes and Low-dimensional Materials　2018/07/15

  21. Investigation of doped nitrogen in graphene on flow-induced voltage generation from graphene-water interface International-presentation

    T. Okada, G. Kalita, M. Tanemura, I. Yamashita, M. Meyyappan, S. Samukawa

    European Material Research Society Spring Meeting and Exhibits　2018/06/19

  22. Spatially Resolved Electrochemical Analysis for Redox Activities of Graphene/Graphite Surface Structures International-presentation

    A. Kumatani, C. Miura, Y. Takahashi, T. Okada, H. Ida, H. Shiku, S. Samukawa, T. Matsue

    22nd Topical Meeting of the International Society of Electrochemistry　2018/04/15

  23. Nanoscale Electrochemical Imaging of Redox Activities on Metallic and Semiconducting Single-Walled Carbon Nanotubes International-presentation

    M. Shimura, A. Kumatani, C. Miura, Y. Takahashi, T. Okada, H. Ida, H. Shiku, S. Samukawa, T. Matsue

    22nd Topical Meeting of the International Society of Electrochemistry　2018/04

  24. Energy Harvesting Application of Graphene -Power Generation from Graphene-water Interface- Invited

    OKADA Takeru

    Mini-Symposium of Multi-Energy Innovation Center　2018/03/28

  25. Selective Formation of Nitrogen-Doped Graphene by Neutral Nitrogen Beam Invited

    OKADA Takeru

    27th Annual Meeting of MRS-J (The Material Research Society of Japan)　2017/12/06

  26. 運動エネルギーで駆動される窒素固定反応によるGaNの室温合成 Invited

    今岡享稔, 岡田健, 寒川誠二, 山元公寿

    応用物理学会 シリコンナノテクノロジー分科会　2017/11/15

  27. ナノ電気化学セル顕微鏡を用いたグラフェン/グラファイト表面構造における電気化学活性の評価 Invited

    三浦 千穂, 熊谷 明哉, 岡田 健, 寒川 誠二, 珠玖 仁, 高橋 康史, 末永 智一

    第78回応用物理学会 秋季学術講演会　2017/09/06

  28. Visualization of Electrochemical Activity at Graphene/Graphite Edges

    C. Miura, A. Kumatani, T. Okada, S. Samukawa, H. Shiku, Y. Yasufumi, T. Matsue

    WPI-AIMR International Symposium 2017　2017/02

  29. Effect of Flux and Energy of Hydrogen Neutral Beam on Hydrogenation Process of Graphene International-presentation

    T. Okada, C. Thomas, M. Meyyappan, S. Samukawa

    IEEE 16th International Conference on Nanotechnology　2016/08

  30. Investigation of carbon-nitrogen bonding state in graphene on catalytic activity International-presentation

    T. Okada, K. Y. Inoue, T. Matsue, G. Kalita, M. Tanemura, M. Meyyappan, S. Samukawa

    17th International Conference on the science and technology nanotubes and low-dimensional materials　2016/08

  31. Effects of Flux and Energy of Neutral Beam on Hydrogenation of Graphene International-presentation

    T. Okada, S. Samukawa

    9th International Conference on Reactive Plasmas / 68th Gaseous Electronics Conference / 33rd Symposium on Plasma Processing　2015/10/16

  32. Etching of GaAs materials by chlorine neutral beam for quantum nanodisks fabrication International-presentation

    9th International Conference on Reactive Plasmas / 68th Gaseous Electronics Conference / 33rd Symposium on Plasma Processing　2015/10/16

  33. Selective nitrogen doping of graphene by energy-controlled neutral beam International-presentation

    T. Okada, S.Samukawa

    The 15th IEEE International Conference on Nanotechnology　2015/07/30

  34. 超低損傷中性粒子ビームエッチングによる無損傷グラフェンナノ構造の形成とデバイス展開 Invited

    岡田 健, 寒川 誠二

    Plasma Conference 2014　2014/11/18

  35. Modification of Graphene by Neutral Beam Irradiation and Edge Structure Analysis International-presentation

    T. Okada, S. Samukawa

    American Vacuum Society 61st International Symposium & Exhibition　2014/11

  36. Fabrication of Two-Dimensional 10 nm Graphene dot array and Optical Characterization International-presentation

    T. Okada, K. Igrarashi, P. Han, T. Hitosugi, C-H. Huang, C-Y. Su, S. Samukawa

    2014 International Conference on Solid State Devices and Materials　2014/09

  37. Fundamental mechanisms of neutral beam etching for III-V quantum dots fabrication International-presentation

    C. Thomas, Y. Tamura, T. Okada, A. Higo, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  38. GaAs/AlGaAs quantum nanodisks by using neutral beam etching and their optical response International-presentation

    Y. Tamura, A. Higo, T. Kiba, C. Thomas, T. Okada, W. Yunpeng, H. Sodabanlu, M. Sugiyama, Y. Nakano, A. Murayama, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  39. Neutral beam induced nitridation of multi-layer graphene International-presentation

    T. Okada, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  40. Bio-Template and Neutral Beam Etching Technique applied for Germanium Nanowires Fabrication International-presentation

    M.-T. Chentir, T. Okada, N. Kawai, K. Wada, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  41. Graphene dots fabrication by a bio-template and a neutral beam etching International-presentation

    K. Igarashi, T. Okada, P. Han, K. Sugawara, T. Hitosugi, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  42. Effect of Miniband in a Solar Cell with Quantum Dot Superlattice Fabricated with Bio-templates and Neutral Beam Etching Methods International-presentation

    M. M. Rahman, T. Okada, N. Usami, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  43. Development of damage-free neutral beam processes for future nano-devices International-presentation

    T. Ozaki, T. Okada, T. Kubota, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  44. Fabrication of High Density Sub-10nm Germanium Nanodisk Array Using Bio-template and Neutral Beam Etching for Solar Cell Application International-presentation

    T. Fujii, T. Okada, M. E. Syazwan, T. Isoda, H. Endo, M. M. Rahman, K. Ito, S. Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014　2014/07

  45. a-Germanium Nano Disk Array Fabrication by Combination of Bio Template and Neutral Beam Etching for Solar Cell Application International-presentation

    T. Fujii, T. Okada, M. E. Syazwan, T. Isoda, H. Endo, M. M. Rahman, K. Ito, S. Samukawa

    IEEE Photovolatic Specialists Conference　2014/06

  46. Effect of Miniband Formation in a Quantum Dot Super Lattice Fabricated by Combination of Bio-Template and Neutral Beam Etching for High Efficiency Quantum Dot Solar Cells International-presentation

    M. M. Rahman, M. Igarashi, W. Hu, M. E. Syazwan, T. Okada, Y. Hoshi, N. Usami, S. Samukawa

    IEEE Photovolatic Specialists Conference　2014/06

  47. 中性粒子ビームによるグラフェンの微細加工 Invited

    岡田 健

    電気学会マイクロマシン・センサシステム研究会　2014/05/27

  48. Damage-free AlGaN/GaN Recess-Gate Etching using Cl2 Neutral Beam for High-Performance HEMTs International-presentation

    H. Sekhar, T. Kubota, T. Okada, Y. Tamura, C.-Y. Lee, J. Ohta, H. Fujioka, S. Samukawa

    The 3rd International Symposiumon Next-Generation Electronics　2014/05

  49. Damage-free Etching of Graphene using Oxygen Neutral Beam towards Edge State Control International-presentation

    T. Okada, K. Igarashi, S. Samukawa

    AVS 60th International Symposium & Exhibition　2013/10/31

  50. Ultra-low-edge-defect graphene nanoribbons patterned by a neutral beam International-presentation

    C-H. Huang, T. Okada, K. Igarashi, C-S Lai, S. Samukawa

    IEEE Nanotechnology Materials and Devices Conference　2013/10

  51. Ultra-low Damage Fabrication of Graphene Nanoribbons by Neutral Beam Etching International-presentation

    T. Okada, C-Y. Su, C-H. Huang, K. Igarashi, A. Wada, L-J. Li, K-I Ho, P-W. Li, I-H. Chen, C-S. Lai, S. Samukawa

    2013 Internatinal Conference on Solid State Devices and Materials　2013/09/26

  52. High Density and High Aspect Ratio GaAs/AlGaAs Nanopillar array Fabricated by Fusion of Bio-Template and Neutral Beam Etching International-presentation

    Y. Tamura, A. Higo, T. Kiba, Y. Wang, C. Thomas, T. Okada, W. Hu, A. Murayamaa, M. Sugiyama, Y. Nakano, S. Samukawa

    2013 Internatinal Conference on Solid State Devices and Materials　2013/09/25

  53. Fabrication of Defect-Free Sub-20-nm Germanium Nanodisk Structure Using Bio-template and Neutral Beam Etching International-presentation

    M. E. Fauzi, T. Okada, M. M. Rahman, Y. Hoshi, K. Sawano, I. Yamashita, N. Usami, S. Samukawa

    2013 JSAP-MRS Joint Symposia　2013/09/19

  54. Top-down formation of 2D array of GaAs nano-pillars by using bio-template and neutral beam etching International-presentation

    C. Thomas, Y. Tamura, A. Higo, W. Hu, T. Okada, N. Okuda, I. Yamashita, S. Samukawa

    2013 JSAP-MRS Joint Symposia　2013/09/19

  55. Damage-less Graphene Etching by Oxygen Neutral Beam for Graphene Nanoribbon Fabrication International-presentation

    A. Wada, K. Igarashi, T. Okada, S. Samukawa

    The 13th IEEE International Conference on Nanotechnology　2013/08/08

  56. Simulation of Type-II Ge/Si Quantum Dot Solar Cells International-presentation

    W. Hu, M. M. Rahman, T. Okada, A. Higo, Y. Li, S. Samukawa

    16th International Workshop on Computational Electronics　2013/06/06

  57. Novel ArF resist polymer to suppress the roughness formation in plasma etching processes International-presentation

    K. Kato, A. Yasuda, S. Maeda, T. Uesugi, T. Okada, A. Wada, S. Samukawa

    SPIE Advanced Lithography 2013　2013/02

  58. 高分子溶液中におけるカーボンナノチューブの拡散運動解析 Invited

    岡田 健

    九州工業大学セミナー　2010/11/11

  59. 高分子溶液中におけるカーボンナノチューブの拡散運動 Invited

    岡田 健

    九州大学理学研究院物理学部門セミナー　2010/11/10

  60. 水溶液中におけるカーボンナノチューブの拡散運動解析 Invited

    岡田 健

    京都大学基礎物理学研究所 基研セミナー（物性）　2010/09/29

  61. Diffusional motion analysis of water-dispersible and uniform carbon nanotubes in solution for drug delivery application International-presentation

    T. Okada, Y. Inoue, H. Orikasa, T. Kyotani, A. Ishijima

    3rd Carbon Nanotube Biology, Medicine and Toxicology Satellite Symposium 11th International Conference on the Science and Application of Nanotubes (NT10)　2010/06/06

  62. Construction of heat measurement system using bimetal cantilever under an optical microscope International-presentation

    T. Okada, A Ishijima

    International workshop on biological application of carbon nanotubes　2009/09

  63. Single-Stranded DNA Insertion into Carbon Nanotubes by Electro- and Dielectro-Phoresis International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama, K. Tohji

    210th Meeting of the Electrochemical Society　2006/10

  64. Encapsulation of DNA Negative Ions into Carbon Nanotubes Using Electric Fields in Electrolyte Plasmas International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    8th Asia-Pacific Conference on Plasma Science and Technology and 19th Symposium on Plasma Science for Materials　2006/07

  65. Electric Fields Induced Inside Modification of Carbon Nanotubes Using Negatively Charged Single-Stranded DNA International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama, K. Tohji

    International Conference on the Science and Application of Nanotubes (NT 06)　2006/06

  66. Formation of DNA Encapsulated Carbon Nanotubes by Control of Ion Species in Electrolyte Plasmas International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    International Symposium on Bio- Nano-Electronics　2006/05

  67. DNA Encapsulation inside Carbon Nanotubes by Microplasmas International-presentation Invited

    R. Hatakeyama, T. Okada, T. Kaneko

    3rd International Workshop on Microplasmas 2006　2006/05

  68. Negative Ion Irradiation in Electrolyte Plasma for the Formation of DNA Encapsulated Carbon Nanotubes International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    6th International Conference on Reactive Plasmas & 23rd Symposium on Plasma Processing　2006/01

  69. Conversion of Hydrocarbon Solvents into Carbon-Based Nanomaterials Using Atmospheric Arc Discharge Plasma in Liquid International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    6th International Conference on Reactive Plasmas & 23rd Symposium on Plasma Processing　2006/01

  70. DNA Encapsulated Carbon Nanotube Formation by Using Ion Irradiation Method in Electrolyte Plasmas International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    The 3rd Student-Organizing International Mini-Conference on Information Electronics System　2005/10

  71. Single-Stranded DNA Insertion into Single-Walled Carbon Nanotubes Using Direct Current and Radio Frequency Electric Fields International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama, K. Tohji

    International Conference on the Science and Application of Nanotubes (NT 05)　2005/06

  72. Electrochemical Synthesis of Single-Stranded DNA Encapsulated Single-Walled Carbon Nanotubes International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama, K. Tohji

    207th Meeting of the Electrochemical Society　2005/05

  73. Functional Nanocarbon Formation Using Arc Discharge Plasmas in Solution Phase International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    The 2nd Student-Organizing International Mini-Conference on Information Electronics System　2004/10

  74. Nanocarbon Formation from Hydrocarbon Solvents Using Arc Discharge Plasma in Liquid Phase International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    Asia Pacific Conference on Plasma Science and Technology & Symposium on Plasma Science for Materials (7th APCPST & 17th SPSM)　2004/07

  75. Formation of Carbon-Nanotube/DNA Composite Materials by Using Novel Plasmas International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama, K. Tohji

    International Conference on the Science and Application of Nanotubes (NT 04)　2004/07

  76. Nanocarbon Formation by Using Arc Discharge Plasmas in DNA Dispersed Organic Solvents International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama, K. Tohji

    The 205th Meeting of the Electrochemical Society　2004/05

  77. Development of Arc Discharge Method in Organic Solvents for the Formation of DNA Encapsulated Carbon Nanotubes International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    Novel Materials Processing by Advanced Electromagnetic Energy Sources 2004　2004/03

  78. Formation of DNA encapsulated nanocarbons by using novel plasmas International-presentation

    T. Okada, T. Kaneko, R. Hatakeyama

    The 1st Student-organizing International Mini-Conference on Information Electronics System　2003/11

  79. Laser-induced Molecular Implantation at the Focus of an Objective Lens: A Comparative Study among Anthracene Derivatives International-presentation

    T. Okada, K. Hatakana, J. Hobley, H. Fukumura, M. Kishimoto

    The 4th Pacific Rim Conference on Laser and Electro-Optics　2001/07

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Research Projects 6

  1. 非熱平衡流動相界面における起電力の解明と低温排熱利用

    岡田 健, 小宮 敦樹, 梶本 真司

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2024/04 - 2027/03

  2. 液体流動と電子材料界面における動電現象解明と新規電子デバイス創成 Competitive

    岡田 健

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 東北大学

    2021/04 - 2024/03

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    本年度は当初の計画通りナノ流路を用いた実験系の構築と微細加工改質技術によるナノ流路の作製、および流路内へのグラフェンと電極のアッセンブリを行った。半導体微細加工プロセス（一部では精密機械加工プロセス）を用いて流路の鋳型を作製した。作製した鋳型にPDMS（ポリジメチルシロキサン）を流しこみ固化することで流路部とした。液体流動と界面を形成するグラフェンは化学気相蒸着法によって合成し、すでに確立された任意基板へのグラフェン転写プロセスを適用することでガラス、または熱酸化膜シリコンへグラフェンを転写した。このプロセスにおけるグラフェンのリンクル形成を抑制するため基板表面を0.1N水酸化カリウム水溶液による親水化が重要であることが明らかになった。また、グラフェン転写後の電極アッセンブリによってグラフェンを内壁にもつナノ流路を作製することができた。このようにプロセスの最適化によって再現性よく定量評価に耐えられる評価デバイスの作製に成功している。 さらに流動によってグラフェンに生じる起電力計測を行った。温度、湿度、パーティクルを制御した清浄な環境を電気ノイズを遮断できる壁材料を用いて作製することでマイクロボルトレベルの微小電気シグナル計測が可能であることが実証された。また、流水印加ポンプ、送液チューブ、コネクタなどの適切な選定によって脈動がなく一様な流れを印加することが可能であることが実証できた。 以上のように、当初の目的を概ね達成できたと考える。

  3. Investigation of electrokinetics at flowing water on doped graphene Competitive

    OKADA Takeru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2018/04 - 2021/03

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    Liquid-flow-induced electricity generation from graphene-water interface has received attention for novel energy harvesting. In this research, we have obtained electricity generation from a single water droplet motion on graphene, and investigated the effect of the graphene surface condition on the electricity generation, which is controlled by heteroatom doping. As a result, nitrogen-doped graphene shows 3 times higher voltage generation compared to pristine graphene due to the doping-induced surface charging.The surface potential tuning is shown to play an important role. Furthermore, to investigate the mechanism and quantification of power density, we have fabricated micro-flow-chip which induces controlled-flow. The output performance per unit contact area between water and graphene is found to be proportional to the flow speed, with an electromotive force density of 0.0025 microvolt. The ability to quantify output density will help to construct guidelines for future applications.

  4. Bond state selective synthesis of doped-graphene Competitive

    Okada Takeru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2015/04 - 2018/03

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    In this study, hetero atom doping of graphene was investigated. Doping was carried out by neutral beam process that enables to irradiate energy-controlled beam. In the case of nitrogen doping in graphene, it is found that the formation of nitrogen-carbon bond depends on energy of irradiated beam, thus CN double bond (pyridinic nitrogen) is formed under higher energy (12 eV) and CN single bond (graphitic nitrogen) is formed under 7 eV. Furthermore, nitrogen doped graphene shows catalytic activity of oxygen reduction reaction, and graphitic nitrogen has higher activity.

  5. グラフェンナノリボンの原子配列構造を活用した電子デバイス Competitive

    Han Patrick, 渡邊 源規, 岡田 健

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(C)

    Category: 基盤研究(C)

    Institution: 東北大学

    2016/04 - 2017/03

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    The aim of this proposal is to advance graphene nanoribbon (GNR) fabrication by self-assembly for the purpose of transport-devices fabrication that can elucidate the unique effects of the exact graphene atomic structures on its electromagnetic properties. We have obtained both theoretical and experimental results that are pertinent towards the goal of fabricating the first precise zigzag-edge GNR device, with properties directly accessible from the macroscopic scale. Both these results address the effects of chemical functional groups of the precursor molecules on the length of the final GNR product after self-assembly. We have developed a new mathematical equivalence sampling method to model the assembly of precursor molecules with arbitrary functional groups, to predict the final morphology of the GNR products. We have also used experiments to test the effects of select functional groups on the precursor molecules to determine the actual effects of these functional groups on the morphology of the final GNR products. From these two sets of results, we have elucidated the mechanism of GNR fabrication by self-assembly using select precursor molecules. These results directly contribute to the ultimate goal of this project.

  6. 新領域プラズマ利用DNA内包カーボンナノチューブの創製

    岡田 健

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 東北大学

    2005 - 2006

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    電解質マイクロプラズマを用いて,DNA内包カーボンナノチューブの創製とその特性評価に関する実験を行った. 1.電解質マイクロプラズマ利用DNA内包カーボンナノチューブ創製実験 (1)昨年度確立したDNA負イオンを含む電解質マイクロプラズマ中イオン照射法を用いて,DNA内包カーボンナノチューブ創製実験を行った.DNAを構成する4種の塩基(アデニン,グアニン,チミン,シトシン)はそれぞれ異なる特性を有しているため,塩基独自の特性をカーボンナノチューブに反映させることが可能になると考えられるため,本年度はDNAの塩基配列に着目し実験を行った. (2)異なる励起波長によるラマンスペクトルによってDNAを内包したカーボンナノチューブを評価した結果,塩基の種類によって異なるカーボンナノチューブのラマンスペクトル変化が観測された.この結果は,DNAがカーボンナノチューブに内包している間接的な根拠であると言える.特に,グアニンを含むDNAを内包させた場合,その著しいスペクトル変化が確認された.グアニンは他の塩基に比べて電気的特性が異なり,このことが反映されたものと考えられる. (3)透過型電子顕微鏡中におけるDNA内包カーボンナノチューブの元素分析を行った結果,DNAを構成するリン酸基に由来すると考えられるリンを検出した. 2.DNA内包カーボンナノチューブの特性評価 (1)DNA内包カーボンナノチューブの電気特性評価に先立ち,DNAを構成する塩基とカーボンナノチューブ間の相互作用を明らかにする実験を行った.半導体単層カーボンナノチューブが架橋したマイクロ電極上に塩基分子をそれぞれ添加し,カーボンナノチューブの電気特性変化を観察した結果,グアニンの場合にのみカーボンナノチューブの電気特性に大きな変化が確認された.この結果は、これまで得られた研究結果を支持するものである. (2)上記(1)で得られた結果を元に,塩基配列を制御したDNA内包カーボンナノチューブの電気特性評価を行った.これまでに,グアニンとアデニンが交互に並んだ塩基配列を持つDNAを内包した場合、定量的解析には至っていないものの,カーボンナノチューブの電気特性変化が確認されている.

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Social Activities 6

  1. ナノ材料のエネルギーハーベスティング応用

    2019/09/12 - 2019/09/12

  2. 東北大学片平まつり

    2013 - 2017

  3. Nanotech

    2012 - 2016

  4. 東北大学イノベーションフェア

    2013 - 2015

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    流体科学研究所ナノ・マイクロクラスターの研究紹介

  5. Semicon

    2012 - 2015

  6. 東北大学広報誌 まなびの杜

    2013 - 2013

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Media Coverage 3

  1. わずかな水流から効率的に電気を

    中日新聞

    2024/12/09

    Type: Newspaper, magazine

  2. 微小水流が新たなエネルギー源に Myself

    東北大学 プレスリリース

    2024/11/01

    Type: Internet

  3. Graphene turns water current into electrical current

    AIP Publishing　Scilight

    2020/09/25

    Type: Internet