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Journal of Electron Microscopy 48(4): 361-366 (1999)
© 1999 Oxford University Press

TEM analysis of Pt-particles embedded on TiO2 exhibiting high photocatalytic activity

Masahiko Tsujimoto1,*, Sakumi Moriguchi1, Seiji Isoda1, Takashi Kobayashi1 and Teruo Komatsu2

1 Institute for Chemical Research, Kyoto University Uji, Kyoto 611-0011
2 Faculty of Science, Osaka City University Sumiyoshi-ku, Osaka 558-0022, Japan

*To whom correspondence should be addressed. E-mail: tujimoto{at}eels.kuicr.kyoto-u.ac.jp

Fine particles of semiconductive rutile TiO2 supporting ultra-fine-particles of Pt were studied by high-resolution analytical electron microscopy. The embedded Pt particles were prepared by decomposing a colloidal organic-Pt complex. This particle system is known to exhibit remarkably high photocatalytic activities. In this study, the structural aspects of the high photoactivity were examined by high-resolution imaging, X-ray mapping by energy dispersive spectroscopy and electron energy-loss spectroscopy. As a result, the ultra-fine particles are composed only of Pt and their size distribution is narrow with a mean diameter of 3 nm. The Pt particles with nm-sizes were found to grow epitaxially on rutile TiO2 having the following crystallographic relationship; [110] (001 )Pt // [001] (110)TiO2. This result supports the expected mechanism that the photo-excited electrons efficiently transfer from TiO2 to Pt and promote the reduction of O2 to O2– ions which will be able to react with organic molecules at the surface.

Keywords     platinum particle, decomposing organic-metal colloid, epitaxial growth, high resolution imaging, X-ray mapping, electron energy-loss spectroscopy

Received      3 December 1998, accepted 27 April 1999


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