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New Findings from University of Tokyo in the Area of Photocatalytics Described (Electron-Hole Recombination Time at TiO2 Single-Crystal Surfaces:...

July 8, 2014



New Findings from University of Tokyo in the Area of Photocatalytics Described (Electron-Hole Recombination Time at TiO2 Single-Crystal Surfaces: Influence of Surface Band Bending)

By a News Reporter-Staff News Editor at Physics Week -- New research on Photocatalytics is the subject of a report. According to news reporting originating from Kashiwa, Japan, by VerticalNews correspondents, research stated, "Photocatalytic activity is determined by the transport property of photoexcited carriers from the interior to the surface of photocatalysts."

Our news editors obtained a quote from the research from the University of Tokyo, "Because the carrier dynamics is influenced by a space charge layer (SCL) in the subsurface region, an understanding of the effect of the potential barrier of the SCL on the carrier behavior is essential. Here we have investigated the relaxation time of the photoexcited carriers on single-crystal anatase and rutile TiO2 surfaces by time-resolved photoelectron spectroscopy and found that carrier recombination, taking a nanosecond time scale at room temperature, is strongly influenced by the barrier height of the SCL."

According to the news editors, the research concluded: "Under the flat-band condition, which is realized in nanometer-sized photocatalysts, the carriers have a longer lifetime on the anatase surface than the rutile one, naturally explaining the higher photocatalytic activity for anatase than rutile."

For more information on this research see: Electron-Hole Recombination Time at TiO2 Single-Crystal Surfaces: Influence of Surface Band Bending. Journal of Physical Chemistry Letters, 2014;5(11):1953-1957. Journal of Physical Chemistry Letters can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry Letters - www.pubs.acs.org/journal/jpclcd)

The news editors report that additional information may be obtained by contacting K. Ozawa, University of Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan. Additional authors for this research include M. Emori, S. Yamamoto, R. Yukawa, S. Yamamoto, R. Hobara, K. Fujikawa, H. Sakama and I. Matsuda.

Keywords for this news article include: Asia, Japan, Kashiwa, Physics, Photocatalyst, Electron Holes, Nanotechnology, Emerging Technologies

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Source: Physics Week


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