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Journal of Electron Microscopy 2005 54(supplement 1):i81-i85; doi:10.1093/jmicro/54.suppl_1.i81
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© The Author 2005. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please email: journals.permissions@oupjournals.org

Article

TEM observations of Au and Ir particles supported on CeO2

Tomoki Akita1,*, Mitsutaka Okumura2, Koji Tanaka1, Masanori Kohyama1, Susumu Tsubota3 and Masatake Haruta3

1 Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, AIST Kansai, Midorigaoka 1-8-31, Ikeda, Osaka 563-8577, 2 Department of Chemistry, Graduate School of Science, Osaka Univ. Machikaneyama 1-1, Toyonaka, Osaka 560-0043 and 3 Research Institute for Green Technology, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba, Onogawa 16-1, Tsukuba, Ibaraki 035-8569, Japan

* To whom correspondence should be addressed. E-mail: t-akita{at}aist.go.jp

Abstract

Au/CeO2 and Ir/CeO2 catalysts were observed by a transmission electron microscope in order to investigate the nano-structures of Au and Ir particles and CeO2 grains and the interface structure between metallic particles and CeO2. An annular dark field scanning transmission electron microscope (ADF-STEM) and an energy dispersive X-ray spectroscopy (EDS) revealed that the metallic particles smaller than 2 nm in diameter are highly dispersed on CeO2 supports in both catalysts. For model samples of larger CeO2 particles with flat facets of low-index surfaces, high resolution transmission electron microscopy observations of Au/CeO2 and Ir/CeO2 interfaces were made and the epitaxial relationship between Au and CeO2, (111)[10]Au//(111)[10]CeO2 has been found for the first time.

Keywords     TEM, ADF-STEM, catalyst, Au and Ir, CeO2

Received     22 August 2004, accepted 15 October 2004


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