研究者詳細

顔写真

ベイガ　リオネル　セバスチアン
Veiga Lionel Sebastian
Veiga Lionel Sebastian
所属
高等研究機構材料科学高等研究所　数学連携グループ
職名
特任助教（研究）
学位

  • 博士（工学）（東京大学）

e-Rad 研究者番号
21047285

論文 14

  1. Effects of Ohmic Contact Formation between GaN Photocatalyst and Pt Cocatalyst

    Takaya OCHIAI, Meita ASAMI, Lionel VEIGA, Shingi YAMAGUCHI, Masakazu SUGIYAMA, Tsutomu MINEGISHI

    Electrochemistry　2025年

    DOI： 10.5796/electrochemistry.25-72091 　

  2. A novel particulate photocathode composed of CdTe–ZnTe solid solutions with a composition gradient for solar hydrogen evolution from water

    Lionel S. Veiga, Mamiko Nakabayashi, Takenori Fujii, Masakazu Sugiyama, Tsutomu Minegishi

    Chemical Science　2025年

    DOI： 10.1039/D5SC02472B 　

  3. Enhanced Charge Separation and Hydrogen Evolution from Water over ZnTe-CdTe Solid Solution Based Photocathode with a Composition Gradient

    Lionel Sebastian Sebastian Veiga, Masakazu Sugiyama, Tsutomu Minegishi

    ECS Meeting Abstracts　2024年11月22日

    DOI： 10.1149/MA2024-02593924mtgabs 　

  4. Efficient hydrogen evolution from water over a thin film photocathode composed of solid solutions with a composition gradient of ZnTe and CdTe

    Lionel S. Veiga, Hiromu Kumagai, Masakazu Sugiyama, Tsutomu Minegishi

    Sustainable Energy & Fuels　2024年

    DOI： 10.1039/d4se00067f 　

    ISSN：2398-4902

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    <jats:p>Photocathode composed of solid solutions with a composition gradient of ZnTe and CdTe shows significantly enhanced solar hydrogen evolution from water over bilayer and/or monolayer photocathodes.</jats:p>

  5. Mass-production of water-based ferrofluids capable of developing spike-like structures

    Denisse Jara, Lionel S. Veiga, Octavio Garate, Gabriel Ybarra, Pablo Tancredi

    Journal of Magnetism and Magnetic Materials　2023年4月

    DOI： 10.1016/j.jmmm.2023.170622 　

    ISSN：0304-8853

  6. Nanomaterial-based multifunctional inks for the fabrication of printed biosensors

    Lionel S. Veiga, Octavio Garate, Gustavo Giménez, Gabriel Ybarra, Leandro N. Monsalve

    Smart Multifunctional Nano-inks　2023年

    DOI： 10.1016/b978-0-323-91145-0.00018-9 　

  7. High-performance non-enzymatic hydrogen peroxide electrochemical sensor prepared with a magnetite-loaded carbon nanotube waterborne ink

    Octavio Garate, Lionel S. Veiga, Pablo Tancredi, Anahí V. Medrano, Leandro N. Monsalve, Gabriel Ybarra

    Journal of Electroanalytical Chemistry　2022年6月

    DOI： 10.1016/j.jelechem.2022.116372 　

    ISSN：1572-6657

  8. Understanding the electrochemical sensors’ figures of merit using a H2O2 sensitive, low-cost ferrite powder first generation electrode

    Octavio Federico Garate, Lionel Sebastian Veiga, Pablo Tancredi, Gabriel Ybarra

    Educación Química　2022年4月18日

    DOI： 10.22201/fq.18708404e.2022.2.80070 　

    ISSN：1870-8404 0187-893X

  9. Fully Inkjet-Printed Biosensors Fabricated with a Highly Stable Ink Based on Carbon Nanotubes and Enzyme-Functionalized Nanoparticles

    Mijal Mass, Lionel S. Veiga, Octavio Garate, Gloria Longinotti, Ana Moya, Eloi Ramón, Rosa Villa, Gabriel Ybarra, Gemma Gabriel

    Nanomaterials　2021年6月23日

    DOI： 10.3390/nano11071645 　

    ISSN：2079-4991

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    <jats:p>Enzyme inks can be inkjet printed to fabricate enzymatic biosensors. However, inks containing enzymes present a low shelf life because enzymes in suspension rapidly lose their catalytic activity. Other major problems of printing these inks are the non-specific adsorption of enzymes onto the chamber walls and stability loss during printing as a result of thermal and/or mechanical stress. It is well known that the catalytic activity can be preserved for significantly longer periods of time and to harsher operational conditions when enzymes are immobilized onto adequate surfaces. Therefore, in this work, horseradish peroxidase was covalently immobilized onto silica nanoparticles. Then, the nanoparticles were mixed into an aqueous ink containing single walled carbon nanotubes. Electrodes printed with this specially formulated ink were characterized, and enzyme electrodes were printed. To test the performance of the enzyme electrodes, a complete amperometric hydrogen peroxide biosensor was fabricated by inkjet printing. The electrochemical response of the printed electrodes was evaluated by cyclic voltammetry in solutions containing redox species, such as hexacyanoferrate (III/II) ions or hydroquinone. The response of the enzyme electrodes was studied for the amperometric determination of hydrogen peroxide. Three months after the ink preparation, the printed enzyme electrodes were found to still exhibit similar sensitivity, demonstrating that catalytic activity is preserved in the proposed ink. Thus, enzyme electrodes can be successfully printed employing highly stable formulation using nanoparticles as carriers.</jats:p>

  10. Magnetic mesoporous silica nanospheres with dual probe & release fluorescent functionality

    Pablo Tancredi, Patricia C Rivas-Rojas, Lionel S Veiga, Octavio Garate, Leandro M Socolovsky, Diego Muraca, Gabriel Ybarra

    Nanotechnology　31　(49)　495603-495603　2020年12月4日

    出版者・発行元： {IOP} Publishing

    DOI： 10.1088/1361-6528/abb2c1 　

    ISSN：0957-4484 1361-6528

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    <jats:title>Abstract</jats:title> <jats:p>The combination of different nanomaterials through step-by-step synthesis procedures has turned into a promising alternative to fabricate high-quality nanosystems in order to satisfy the increasingly demanding requirements of the biomedical field. In this work, we report a detailed study on the synthesis and characterization of a complex nanosystem composed of nanoparticles with a single magnetic nanoparticle core and a shell of dense and mesoporous silica arranged in layers. The procedure designed to fabricate these systems lead us to the formation of a dispersion of non-agglomerated spherical nanoparticles of nearly 100 nm. The structural characterization performed over the final samples confirmed both the prevalence of single-core systems and the presence of the mesoporous silica shell in the outer layer. The performance of the nanosystem in a specific technological application was tested by sequentially loading two different fluorescents molecules by covalent and non-covalent bonding strategies. Due to the distinct loading strategies, the resulting nanosystem presented a magnetically-assisted probe &amp; release functionality as analyzed in a magnetophoretic experiment.</jats:p>

  11. One-Pot Ultrafast Microwave-Assisted Synthesis of Copper and Copper Oxide Nanoparticles

    Lionel Veiga, Octavio Garate, Paulina Lloret, Carlos Moina, Gabriel Ybarra

    International Journal of Nanoscience　2019年12月

    DOI： 10.1142/s0219581x18500345 　

    ISSN：0219-581X 1793-5350

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    <jats:p> A method of synthesis is presented for the rapid preparation of copper, copper oxide and mixed copper oxide-copper nanoparticles employing a conventional home microwave oven. The nanoparticles were characterized by SEM, XRD and UV-visible spectroscopy. The size and the composition of the nanoparticles were controlled by the heating time. Cuprous oxide nanoparticles were obtained at short heating times and copper nanoparticles at longer times, while mixed cuprous oxide-copper nanoparticles where obtained in an in between window of time. </jats:p>

  12. Magnetophoretic mobility of iron oxide nanoparticles stabilized by small carboxylate ligands

    Pablo Tancredi, Lionel S. Veiga, Octavio Garate, Gabriel Ybarra

    Colloids and Surfaces A: Physicochemical and Engineering Aspects　2019年10月

    DOI： 10.1016/j.colsurfa.2019.123664 　

    ISSN：0927-7757

  13. Introducción a los fenómenos ópticos de nanopartículas metálicas a través simulaciones computacionales en línea

    Octavio Federico Garate

    Educación Química　2019年2月7日

    DOI： 10.22201/fq.18708404e.2019.1.64777 　

    ISSN：1870-8404 0187-893X

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    <jats:p>&lt;p&gt;Al introducir las propiedades dependientes del tamaño de los nanomateriales, uno de los tópicos más atractivos lo constituyen las propiedades ópticas de las nanopartículas, debido al impacto inmediato que generan sobre el observador. No obstante, por lo general no resulta posible introducir un tratamiento riguroso de los fenómenos de absorción y dispersión de luz, debido al complejo marco teórico asociado a las interacciones entre la radiación electromagnética y las nanopartículas. Utilizando una herramienta de simulación en línea como Nmie-Nanohub, se propone una secuencia pedagógica que permita analizar la dependencia de estos fenómenos ópticos con los parámetros relevantes, tales como la longitud de onda de la radiación incidente, el tamaño y material de las nanopartículas, y el medio en el cual se encuentran inmersas.&lt;/p&gt;</jats:p>

  14. Waterborne carbon nanotube ink for the preparation of electrodes with applications in electrocatalysis and enzymatic biosensing

    Octavio Garate, Lionel Veiga, Anahí V. Medrano, Gloria Longinotti, Gabriel Ybarra, Leandro N. Monsalve

    Materials Research Bulletin　2018年10月

    DOI： 10.1016/j.materresbull.2018.05.015 　

    ISSN：0025-5408

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