Growth and Electronic Properties of Ag Nanoparticles on Reduced CeO2-x（111） Films

• Published in: 化学物理学报 Vol. 25; no. 6; pp. 713 - 718
• Main Author: Dan-dan Kong Yong-he Pan Guo-dong Wang Hai-bin Pan Jun-fa Zhu
• Format: Journal Article
• Language: Chinese
• Published: 2012
• Subjects: CeO2; 二氧化铈; 共振增强; 生长发育; 电子性质; 薄膜; 银纳米粒子; 颗粒密度
• ISSN: 1674-0068; 2327-2244

Ag nanoparticles grown on reduced CeO2-x thin films have been studied by X-ray plhotoelec- tron spectroscopy and resonant photoelectron spectroscopy of the valence band to understand the effect of oxygen vacancies in the CeO2-x thin films on the growth and interracial elec- tronic properties of Ag. Ag grows as three-dimensional particles on the CeO2-x （111） surface at 300 K. Compared to the fully oxidized ceria substrate surface, Ag favors the growth of smaller particles with a larger particle density on the reduced ceria substrate surface, which can be attributed to the nucleation of Ag on oxygen vacancies. The binding energy of Ag3d increases when the Ag particle size decreases, which is mainly attributed to the final-state screening. The interracial interaction between Ag and CeO2_x（lll） is weak. The resonant enhancement of the 4f level of Ce3＋ species in RPES indicates a partial Ce4＋--＋Ce3＋ reduction after Ag deposited on reduced ceria surface. The sintering temperature of Ag on CeO 1.85 （111） surface dur