TEM observations of Au and Ir particles supported on CeO2.
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)[110]Au//(111)[110]CeO2 has been found for the first time.
Akita
Tomoki
T
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, AIST Kansai, Midorigaoka 1-8-31, Ikeda, Osaka 563-8577, Japan. t-akita@aist.go.jp
Okumura
Mitsutaka
M
Tanaka
Koji
K
Kohyama
Masanori
M
Tsubota
Susumu
S
Haruta
Masatake
M