Search Results 1-20 of 169

  • ELECTRONIC PROPERTIES AND CHEMICAL REACTIVITY OF DEFECT-INTRODUCED GRAPHENE AS A PROMISING DEHYDROGENATION CATALYST  [in Japanese]

    重久 雄大

    … Hydrogen adsorption to Graphene is one of the most important examples in terms of applications for the transistor devices accompanied with band gap opening technology and hydrogen storage materials. … Meanwhile, defect-introducing is one of the interesting strategies to give additional adsorption sites to graphene in view of enhancing the interactions between hydrogen and graphene. …

    法政大学大学院紀要. 理工学・工学研究科編 (61), 1-2, 2020-03-24

    IR  DOI 

  • MAGNETIC EVALUATION OF NOx ADSORPTION ON GRAPHENE EDGE STRUCTURE  [in Japanese]

    日景 結理奈

    … Adsorption properties and chemical reactivity of magnetic NO molecules and its derivatives in host material was investigated in terms of spin magnetism. … However, NO adsorption is prevented by pre-adsorption of water vapor, where NO molecules reacts with edges of nanographene in ACFs slowly. …

    法政大学大学院紀要. 理工学・工学研究科編 (61), 1-2, 2020-03-24

    IR  DOI 

  • IRAS of Pt(111) electrode modified with nanographene in the sulfuric acid solution  [in Japanese]

    Endo Osamu , Matsui Fumihiko , Nakamura Masashi , Chun Wang J , Amemiya Kenta , Ozaki Hiroyuki

    <p>白金(111)面に形成したグラフェンはプロトンのみ透過することが知られている。本研究では〜10 nmのナノグラフェンで修飾した白金(111)電極の硫酸水溶液中の振る舞いをサイクリックボルタンメトリー(CV)と赤外反射吸収分光(IRAS)によって解析した。CVではプロトン透過に相当する電流が観測された。IRASにより高電位側でSO伸縮振動に帰属できる吸収バンドが観測され硫酸イオンの …

    Abstract book of Annual Meeting of the Japan Society of Vacuum and Surface Science 2020(0), 55, 2020

    J-STAGE 

  • Preparation and Organic Solvent Adsorption of PTFE Fabric Reinforced GO/SiO<sub>2</sub> Aerogel

    Yan Wenqian , Zhu Kunmeng , Wu Xiaodong , Li Boya , Cui Sheng , Shen Xiaodong

    … <p>The adsorption capacity of SiO<sub>2</sub> … aerogel has been greatly improved with the cross-linking of graphene and composition of PTFE fabric via sol-gel method and CO<sub>2</sub> … In terms of adsorption capacity, the result shows that it can reach the value of 10.87 g/g for NMP and 9.24 g/g for cyclohexane. … Furthermore, it can still retain the initial adsorption of 78.3% to 85.9% after several cycles. …

    Chemistry Letters 49(11), 1324-1328, 2020

    J-STAGE 

  • Nitrate Ion Adsorption Characteristics of Activated Carbon Fibers with and without Quaternary Nitrogen Effective for Anion Adsorption

    Tsuchiya Yukiyoshi , Amano Yoshimasa , Machida Motoi

    … <p>By comparing the two types of activated carbon fibers (ACFs), characteristics of adsorption sites for nitrate ion other than quaternary nitrogen (N-Q) were investigated. … We assessed the amount of functional groups, elemental composition, porous properties, and model of unit crystal size of graphene. …

    Chemical and Pharmaceutical Bulletin 68(10), 1001-1007, 2020

    J-STAGE 

  • Development of Transfer Process of Graphene Sheet on a Soft Substrate for Strain-controlled Highly Sensitive Gas Sensors

    Qia Xiangyu , Zhang Qinqiang , Suzuki Ken , Miura Hideo

    The Proceedings of Conference of Tohoku Branch 2020.55(0), 179_paper, 2020

    J-STAGE 

  • Oxygen Reduction Reaction Activity of Pt Sub-nano Clusters Supported on Graphene  [in Japanese]

    HASEGAWA Shun , KUNISADA Yuji , SAKAGUCHI Norihito

    … Pt<sub>3</sub>) on pristine and various light-element doped graphene using first-principles calculations based on density functional theory. … We revealed that ORR activity of these systems shows so-called volcano plot with adsorption energy of an OH which is an ORR intermediate as well as bulk metal catalysts. … and Pt<sub>3</sub>, and a support effect caused by light-elements doped graphene is more clearly observed in the cases of Pt<sub>1</sub>. …

    Vacuum and Surface Science 63(8), 413-418, 2020

    J-STAGE 

  • Amino-modified Graphene Oxide/Fe<sub>3</sub>O<sub>4</sub> for Dispersive Solid-Phase Extraction of Cadmium Ions in Rice, Lentil, and Water Samples

    MEHDINIA Ali , SALAMAT Maede , JABBARI Ali

    … <p>In this study, amino groups were directly coated on reduced graphene oxide sheets and applied for the extraction of cadmium(II) ions from well water, aqueduct (water coming from mountain), lentils and rice prior to measurements by flame atomic absorption spectrometry. … Some parameters related to the adsorption and desorption stages were optimized. …

    Analytical Sciences 36(3), 317-322, 2020

    J-STAGE 

  • An optical ammonia gas sensor with adjustable sensitivity using a silicon microring resonator covered with monolayer graphene

    Kishikawa Hiroki , Sato Masayasu , Goto Nobuo , Yanagiya Shin-ichiro , Kaito Takamasa , Liaw Shien-Kuei

    … Integrated optic ammonia gas sensor using graphene covered silicon microring resonator is proposed. … Ammonia gas adsorption increases the Fermi energy of graphene. … By applying voltage to the graphene, the Fermi energy is controlled to adjust the sensitivity and the range of detectable concentration. …

    Japanese Journal of Applied Physics 58(SJ), SJJD05, 2019-07-18

    IR 

  • Benzo-Fused Periacenes or Double Helicenes? Different Cyclodehydrogenation Pathways on Surface and in Solution

    Qigang Zhong , Yunbin Hu , Kaifeng Niu , Haiming Zhang , Biao Yang , Daniel Ebeling , Jalmar Tschakert , Tao Cheng , André Schirmeisen , Akimitsu Narita , Klaus Müllen , Lifeng Chi

    … Controlling the regioselectivity of C-H activation in unimolecular reactions is of great significance for the rational synthesis of functional graphene nanostructures, which are called nanographenes. … Here, we demonstrate that the adsorption of tetranaphthyl-p-terphenyl precursors on metal surfaces can completely change the cyclodehydrogenation route and lead to obtaining planar benzo-fused perihexacenes rather than double [7]helicenes during solution synthesis. …

    Journal of the American Chemical Society 141(18), 7399-7406, 2019-04-16

    IR 

  • Suppression of protein adsorption on a graphene surface by phosphorylcholine functionalization

    Taniguchi Yoshiaki , Miki Tsubasa , Ohno Yasuhide , Nagase Masao , Arakawa Yukihiro , Imada Yasushi , Minagawa Keiji , Yasuzawa Mikito

    Japanese Journal of Applied Physics 58(5), 055001-055001, 2019-04-10

    DOI 

  • HYDROGEN ADSORPTION EFFECTS ON CHEMICAL STRUCTURE AND ELECTRONIC PROPERTIES OF DEFECT-INTRODUCED GRAPHENE  [in Japanese]

    小幡 吉徳

    … According to a theoretical calculation, hydrogenated atomic vacancies in graphene were predicted to have a low energy barrier and little adsorption heat for additional hydrogen molecules. … In this study, defects were introduced into epitaxial graphene by ion beam irradiation, and their chemical structure was investigated using XPS, Raman spectroscopy, and Elastic Recoil Detection Analysis (ERDA). …

    法政大学大学院紀要. 理工学・工学研究科編 (60), 1-2, 2019-03-31

    IR  DOI 

  • Effect of Strain on the Gas Adsorption of Graphene: A First Principle Study  [in Japanese]

    GUAN Yizhao , QIAO Xiangyu , ZHANG Qinqiang , SUZUKI Ken , MIURA Hideo

    … <p>The graphene based gas sensor was proposed as the next generation sensor which have the high sensitivity to detect gases with concentration smaller than 1 p.p.m, along with fast response time and low thermal noise. … At the same time, the strain effect on graphene have been studied in detail. …

    The Proceedings of The Computational Mechanics Conference 2019.32(0), 181, 2019

    J-STAGE 

  • Dispersion of Graphene in an Aqueous Solution with Poly(sodium 4-styrenesulfonate) Monitored by Capillary Electrophoresis

    TAKAYANAGI Toshio , MIZUTA Yuto , BECCHAKU Yuta , MIZUGUCHI Hitoshi

    … <p>Graphene was dispersed in an aqueous solution with poly(sodium 4-styrenesulfonate) as a dispersant. … The charge of the graphene came to be apparently negative by the adsorption of poly(4-styrenesulfonate) ion (PSS). … Capillary electrophoresis was used to evaluate the dispersion of the apparently anionic graphene in an aqueous solution. … A broad signal corresponding to the dispersed graphene was detected in the electropherograms. …

    CHROMATOGRAPHY 40(3), 121-126, 2019

    IR  J-STAGE 

  • Spectroscopy of N-doped graphene catalyst surface toward ORR under reaction conditions  [in Japanese]

    Kubo Kazufumi , Santosh Singh K. , Furukawa Moeko , Hikita Yusuke , Takeyasu Kotaro , Nakamura Junji

    <p>本研究ではピリジン型窒素含有分子触媒および，疎水性を強化した窒素ドープグラフェン触媒における酸性条件下のORR素過程を調べるためにラマン分光法・赤外分光法・DFT計算を用いた。これによりORR初期過程においてピリジン型窒素のプロトン化が確認された。同時に対アニオンが吸着していることも示唆された。DFT計算の結果と合わせて，ORRに先立って窒素が水素化され酸素吸着を促進していると考 …

    Abstract book of Annual Meeting of the Japan Society of Vacuum and Surface Science 2019(0), 3Cp02, 2019

    J-STAGE 

  • Investigation of the mechanical flexibility and electrochemical stabilities of nanoporous materials consisting of single-layer graphene  [in Japanese]

    Nomura Keita

    <p>グラフェンは<i>sp</i><sup>2</sup>炭素から成る1枚のシートであり，1原子分の薄さから高い比表面積(2630 m<sup>2</sup>/g)や機械的柔軟性をもち，またその化学的な安定性は非常に高く，導電性も有する魅力的な材料である。しかし，グラフェンは二次元のシートであるために，<i …

    TANSO 2019(289), 172-173, 2019

    J-STAGE 

  • A Label-free Cardiac Troponin T Electrochemiluminescence Immunosensor Enhanced by Graphene Nanoplatelets

    NOOR AZAM Nura Fazira , MOHAMMAD Nur Afina , LIM Syazana Abdullah , AHMED Minhaz Uddin

    … <p>In this study, a direct and label-free immunosensor was designed and constructed by modifying the screen-printed electrode with graphene nanoplatelets (GNPs) for the detection of the cardiac troponin T (cTnT). … physical adsorption; …

    Analytical Sciences 35(9), 973-978, 2019

    J-STAGE  Ichushi Web 

  • Determination of Phosphate in Human Serum with Zirconium/Reduced Graphene Oxide Modified Electrode

    POURBEYRAM Sima , SOLTANPOUR Maryam , FATHALIPOUR Soghra

    … <p>An electrochemical phosphate sensor based on zirconium and reduced graphene oxide modified pencil graphite electrode (Zr/rGO-PGE) is proposed. … Cyclic voltammetry showed the immobilized rGO was highly stable and had high activity toward zirconium adsorption. …

    Analytical Sciences 35(7), 739-743, 2019

    J-STAGE  Ichushi Web 

  • Theoretical Study of Metal Atom Adsorption States on Graphene  [in Japanese]

    HASEGAWA Shun , KUNISADA Yuji , SAKAGUCHI Norihito

    … <p>We investigated the adsorption states and diffusion behavior of Pt and Fe atoms on pristine and various light-element-doped graphene using first-principle calculations based on density functional theory to reveal the support that can keep particle size of metal clusters for a long time. … We show a weak interaction between Pt, Fe atoms and pristine graphene. …

    Vacuum and Surface Science 62(6), 344-349, 2019

    J-STAGE 

  • Borocarbonitrides, B<sub>x</sub>C<sub>y</sub>N<sub>z</sub>, 2D Nanocomposites with Novel Properties

    Rao C. N. R. , Pramoda K.

    … <p>Chemical doping of graphene is necessary to generate a band gap that is valuable for a range of applications. … Chemical doping of graphene with elements like nitrogen and boron gives rise to useful properties. … The products obtained show evidence for the presence of B-C and C-N bonds besides B-N and C-C bonds (but no N-N bonds), and possible occurrence of random BCN networks in addition to graphene and BN domains. …

    Bulletin of the Chemical Society of Japan 92(2), 441-468, 2019

    J-STAGE 

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