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Journal of Electron Microscopy 50:473-477 (2001)
© 2001 Oxford University Press

Paper

TEM and HAADF-STEM study of a Au catalyst supported on a TiO2 nano-rod

Tomoki Akita, Koji Tanaka, Kayoko Okuma, Tsuguo Koyanagi and Masatake Haruta

National Institute of Advanced Industrial Science and Technology (previously called the Osaka National Research Institute), Midorigaoka 1-8-31, Ikeda, 563-8577, Japan
Catalyst and Chemical Ind. Co. Ltd, Kitaminato-machi 13-2, Wakamatsu-ku, Kitakyushu, Fukuoka, Japan

Gold nanoparticles were deposited on TiO2 nano-rods by a deposition precipitation method. This Au/TiO2 nano-rods catalyst is active for CO oxidation even at temperatures less than 273K and is as active as the catalyst of Au supported on conventional TiO2 particles. Transmission electron microscopy (TEM) showed that the TiO2 nano-rods were composed of a single anatase crystal and had a pillar shape with an axis along the <111> direction surrounded by flat four {101} planes. High angle annular dark field scanning TEM (HAADF-STEM) also revealed that a Au platelet with a thickness of 0.5–1 nm was formed at the interface between TiO2 nano-rods. The Au platelet was not observed when conventional round particles of TiO2 were used as a support.

Keywords     Au nanoparticle, TiO2 nano-rod, CO oxidation catalyst, HRTEM, HAADF-STEM


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