title: TEM observations of Au and Ir particles supported on CeO2.
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)[110]Au//(111)[110]CeO2 has been found for the first time.
authors.affiliation: 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
authors.forename: Tomoki
authors.initials: T
authors.lastname: Akita
authors.forename: Mitsutaka
authors.initials: M
authors.lastname: Okumura
authors.forename: Koji
authors.initials: K
authors.lastname: Tanaka
authors.forename: Masanori
authors.initials: M
authors.lastname: Kohyama
authors.forename: Susumu
authors.initials: S
authors.lastname: Tsubota
authors.forename: Masatake
authors.initials: M
authors.lastname: Haruta