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RISS 인기검색어
- 검색키워드
- 저자 : Tadaoki Mitani (검색결과 2 건)
- 무료
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- 유료
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Photoluminescence of C60 Aggregates in Solvent Mixtures
Jeung Sun Ahn,Hwa-Min Kim,Keisuke Suzuki,Koo-Chul Je,Tadaoki Mitani,Young-Jin Kang 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
Temperature dependence of the photoluminescence of C$_{60}$ in CS$_{2}$, as a typical example of the formation of C$_{60}$ aggregates by the liquid-solid transition of solution, and the photoluminescence of C$_{60}$ in room-temperature benzene-ethanol mixtures of different compositions are presented. By comparing the photoluminescence spectra of C$_{60}$ in benzene-ethanol mixtures with those of C$_{60}$ in solution (toluene, benzene and CS$_{2}$) and C$_{60}$ single-crystal, it has been found that the drastic spectral change in photoluminescence spectra of C$_{60}$ in benzene-ethanol mixtures of different compositions are strongly ascribed to the formation of C$_{60}$ aggregates. Moreover, it has been found that the energy of maximum intensity and the spectral shape in the room-temperature photoluminescence of C$_{60}$ aggregates in benzene-ethanol mixtures are not sensitive to the ethanol volume fraction.
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Roles of Surface Steps on Pt Nanoparticles in Electro-oxidation of Carbon Monoxide and Methanol
Lee, Seung Woo,Chen, Shuo,Sheng, Wenchao,Yabuuchi, Naoaki,Kim, Yong-Tae,Mitani, Tadaoki,Vescovo, Elio,Shao-Horn, Yang American Chemical Society 2009 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.131 No.43
<P>Design of highly active nanoscale catalysts for electro-oxidation of small organic molecules is of great importance to the development of efficient fuel cells. Increasing steps on single-crystal Pt surfaces is shown to enhance the activity of CO and methanol electro-oxidation up to several orders of magnitude. However, little is known about the surface atomic structure of nanoparticles with sizes of practical relevance, which limits the application of fundamental understanding in the reaction mechanisms established on single-crystal surfaces to the development of active, nanoscale catalysts. In this study, we reveal the surface atomic structure of Pt nanoparticles supported on multiwall carbon nanotubes, from which the amount of high-index surface facets on Pt nanoparticles is quantified. Correlating the surface steps on Pt nanoparticles with the electrochemical activity and stability clearly shows the significant role of surface steps in enhancing intrinsic activity for CO and methanol electro-oxidation. Here, we show that increasing surface steps on Pt nanoparticles of approximately 2 nm can lead to enhanced intrinsic activity up to approximately 200% (current normalized to Pt surface area) for electro-oxidation of methanol.</P>
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