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Thermal decomposition of Mo(CO)6 on thin Al2O3 film: A combinatorial investigation by XPS and UPS
Authors:Zhiquan Jiang  Weixin Huang  Hong Zhao  Xinhe Bao
Institution:a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
b Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:A thin and homogeneous alumina film was prepared by deposition and oxidation of aluminum on a refractory Re(0 0 0 1) substrate under ultrahigh vacuum conditions. X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS) and high-resolution electron-energy-loss spectroscopy (HREELS) demonstrate that the oxide film is long-range ordered, essentially stoichiometric and free from surface hydroxyl groups. The chemisorption and thermal decomposition of Mo(CO)6 on the Al2O3 film were investigated by means of XPS and UPS. Mo(CO)6 adsorbs molecularly on the oxide film at 100 K; however, thermal decomposition of the adsorbate occurs upon annealing at high temperatures. Consequently the metallic molybdenum clusters are deposited on the thin alumina film via complete decarbonylation of Mo(CO)6.
Keywords:Molybdenum hexacarbonyl  Thin Al2O3 film  Thermal decomposition  X-ray photoelectron spectroscopy  Ultraviolet photoelectron spectroscopy
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