Water Adsorption on TiOx Thin Films Grown on Au(111)
Water Adsorption on TiOx Thin Films Grown on Au(111)
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DOI：
10.1021/acs.jpcc.5b00561
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发表时间：
2015-03
影响因子：
3.7
通讯作者：
M. Farstad;D. Ragazzon;L. E. Walle;A. Schaefer;A. Sandell;A. Borg
中科院分区：
文献类型：
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作者：
M. Farstad;D. Ragazzon;L. E. Walle;A. Schaefer;A. Sandell;A. Borg
利用高分辨光电子能谱研究了在Au（111）衬底上化学气相沉积的四种不同结构的TiOx薄膜的水吸附。两种结构是还原的TiOx单层相，分别形成蜂窝状（HC）和风车状（PW）结构。另外两个相具有TiO 2化学计量，一个为岛的形式，一个为TiO 2（B）（001）扩展层的形式。除了HC相之外的所有相都观察到部分水解离，并且解离倾向和吸附物热稳定性结构是由特定TiOx相的原子结构与制备中形成的缺陷之间的相互作用引起的。TiO2（B）薄膜上的解离主要与不同类型的缺陷位点有关。被解释为表面重构的金红石TiO2（100）的TiO2岛产生最高量的羟基，其行为与重构成混合的（100）和（110）终止一致。水分解
High resolution photoelectron spectroscopy has been used to investigate water adsorption on four different TiOx ultrathin film structures, grown on Au(111) by chemical vapor deposition. Two of the structures are reduced TiOx single layer phases, forming a honeycomb (HC) and a pinwheel (PW) structure, respectively. The other two phases have TiO2 stoichiometry, one in the form of islands and one in the form of a TiO2(B)(001) extended layer. Partial water dissociation is observed for all phases but the HC phase, and the dissociation propensity and adsorbate thermal stability structure result from interplay between the atomic structure of the particular TiOx phase and defects formed in the preparation. The dissociation on the TiO2(B) film is mainly related to different types of defect sites. The TiO2 islands, interpreted as surface reconstructed rutile TiO2(100), generate the highest amount of hydroxyls with a behavior consistent with reconstruction into a mixed (100) and (110) termination. Water dissociation...