TEM and HAADF-STEM study of the structure of Au nano-particles on CeO2
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The structure and growth process of Au particles on CeO2 were observed by the transmission electron microscope (TEM) equipped with the high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) system. The growth of Au particles on CeO2 was shown to be mainly Ostwald ripening under heating at various temperatures, although it is suppressed in the hydrogen atmosphere. In the HAADF-STEM observation of Au/CeO2 interfaces with the orientation relationship of (111)[1–10]Au//(111)[1–10]CeO2, (111)[−110]Au//(111)[1–10]CeO2 and atomic columns of Au and Ce were successfully resolved, and the interface structure was analyzed in details for the first time.
KeywordsCeO2 Transmission Electron Microscope Image Transmission Electron Microscopy Observation Atomic Column Hydrogen Stream
This work was supported by the Japan Society for the Promotion of Science (JSPS-Grant-in-Aid for Scientific Research (B) 18360322). The authors are grateful to Drs. S. Ichikawa (Osaka University), K. Okazaki, and S. Tanaka (AIST) and Prof. M. Haruta (Tokyo Metropolitan University) for their valuable comments and stimulating discussion. The authors are also grateful to Ms. J. Maekawa and Ms. M. Makino for their assistance with sample preparation.