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Journal of Electron Microscopy Advance Access originally published online on October 17, 2007
Journal of Electron Microscopy 2007 56(5):177-180; doi:10.1093/jmicro/dfm021
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

In situ High-Resolution Transmission Electron Microscopy of Photocatalytic Reactions by Excited Electrons in Ionic Liquid

Kenta Yoshida1,2,*, Tsutomu Nozaki2, Tsukasa Hirayama1 and Nobuo Tanaka3

1 Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
2 Department of Crystalline Materials Science, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
3 EcoTopia Science Institute, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan

* To whom correspondence should be addressed. E-mail: k_yoshida{at}jfcc.or.jp

A transmission electron microscope (TEM) sample for observing photocatalysis in a liquid was prepared by using N,N,N-trimetyl-N-propylammonium-bis(trifluoromethanesulfonyl)imide. The ionic liquid (IL) was used as a reaction solvent. Tetrachloroauric acid was dissolved in the IL as gold ion species. Rutile particles were added in the solution as a photocatalyst. The low vapor pressure of the IL enables a diffusing system in high vacuum of TEM. Rutile particles were UV irradiated in that liquid phase. After 3 h UV irradiation, a gold particle of 8 nm diameter was grown on the TiO2 surface. Photonucleation of Au/TiO2 system was discussed from the high-resolution TEM images.

Keywords     TEM, In-situ, ionic liquid, photocatalyst

Received      1 May 2007, accepted 17 July 2007


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