采用光电子能谱法研究氧与 Au/Ti(0001) 表面合金的相互作用。

Interaction of oxygen with Au/Ti(0001) surface alloys studied by photoelectron spectroscopy.

机构信息

Faculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic.

出版信息

J Phys Condens Matter. 2010 Jul 7;22(26):265002. doi: 10.1088/0953-8984/22/26/265002. Epub 2010 May 24.

DOI:10.1088/0953-8984/22/26/265002

PMID:21386468

Abstract

The interaction of oxygen with gold adsorbed on Ti(0001) was studied by synchrotron radiation photoelectron spectroscopy. Two kinds of surfaces were explored: as-deposited 0.38, 1.16 and 1.85 monolayer (ML) thick Au overlayers on the Ti(0001) surface, and the same samples after thermal treatment, which resulted in the formation of Au-Ti intermetallic surfaces. The Ti 3p core level was strongly affected by reaction with oxygen, while the Au 4f core level showed only minor changes other than a decrease in intensity. The Ti 3p peak was fitted with several components which were identified as Ti atoms in different oxidation states, namely TiO, Ti(2)O(3), TiO(2) and Ti-OH. Titanium oxide phase formation is accompanied by Au-Ti bond dissociation and outward diffusion of Ti. The presence of an Au-Ti intermetallic phase on the Ti(0001) surface promotes oxidation of the Ti atoms.

摘要

采用同步辐射光电子能谱研究了吸附在 Ti(0001)表面上的金与氧的相互作用。研究了两种表面：Ti(0001)表面上沉积的 0.38、1.16 和 1.85 单层（ML）厚的 Au 覆盖层，以及经过热处理后形成 Au-Ti 金属间化合物表面的相同样品。Ti 3p 芯能级受与氧反应的强烈影响，而 Au 4f 芯能级除强度降低外几乎没有变化。Ti 3p 峰拟合了几个成分，这些成分被鉴定为不同氧化态的 Ti 原子，即 TiO、Ti(2)O(3)、TiO(2)和 Ti-OH。氧化钛相的形成伴随着 Au-Ti 键的解离和 Ti 的向外扩散。Ti(0001)表面上存在 Au-Ti 金属间相促进了 Ti 原子的氧化。