Adsorption-Site-Dependent Electronic Structure of Catechol on the Anatase TiO2(101) Surface
Adsorption-Site-Dependent Electronic Structure of Catechol on the Anatase TiO2(101) Surface
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DOI：
10.1021/la201553k
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发表时间：
2011-07-19
期刊：
影响因子：
3.9
通讯作者：
Diebold, Ulrike
中科院分区：
文献类型：
--
作者：
Li, Shao-Chun;Losovyj, Yaroslav;Diebold, Ulrike
利用同步辐射紫外光电子能谱（UPS）、X射线光电子能谱（XPS）和扫描隧道显微镜（STM）研究了邻苯二酚（1，2-benzenediol）在TiO 2（101）表面的吸附。邻苯二酚以单位吸附系数吸附，苯环完整。STM揭示了在台阶边缘和次表面点缺陷处的优选成核，随后是ID生长和在全覆盖下形成2 × 1超结构。对于超过类似于0.4朗缪尔的剂量，观察到价带最大值以上类似于1 eV的带隙状态，但对于较低的覆盖率，不存在这样的状态。因此，带隙态的形成与在规则晶格位置的吸附和自组装超结构的发生相关。
The adsorption of catechol (1,2-benzendiol) on the anatase TiO2(101) surface was studied with synchrotron-based ultraviolet photoemission spectroscopy (UPS), X-ray photoemission spectroscopy (XPS), and scanning tunneling microscopy (STM). Catechol adsorbs with a unity sticking coefficient and the phenyl ring intact. STM reveals preferred nucleation at step edges and subsurface point defects, followed by ID growth and the formation of a 2 x 1 superstructure at full coverage. A gap state of similar to 1 eV above the valence band maximum is observed for dosages in excess of similar to 0.4 Langmuir, but such a state is absent for lower coverages. The formation of the band gap states thus correlates with the adsorption at regular lattice sites and the onset of self-assembled superstructures.