Photoresponse of surface oxygen defects on TiO2(110)
Photoresponse of surface oxygen defects on TiO2(110)
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DOI：
10.1016/j.apsusc.2004.10.117
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发表时间：
2005-05-15
影响因子：
6.7
通讯作者：
Li, YJ
中科院分区：
文献类型：
--
作者：
Komiyama, M;Li, YJ
利用扫描隧道显微镜（STM），在原子尺度上研究了金红石型TiO 2（110）表面的局域光响应。当325nm紫外光照射时，（110）面上几乎所有的区域都被激发，而与氧缺陷和“玫瑰花结”结构相关的台阶和（1×2）脊表现出更高的响应强度。先前提出的光激发机制，涉及在能带隙中的氧缺陷态的检查通过激发新创建的缺陷位点。这些位点确实对照明有反应，但有趣的是，当这些位点配对时，只有一个位点对可见光照明是活跃的。
Using scanning tunneling microscopy (STM), the local photoresponse of a rutile TiO2(110) surface was investigated on the atomic scale. While the illumination of 325nm ultraviolet (UV) light excited almost all the areas on the (110) surface, steps and (1×2) ridges that are associated with oxygen deficiencies and a “rosette” structure exhibited higher response intensities. Previously proposed photoexcitation mechanism involving oxygen defect states in the energy band gap is examined by exciting newly created defect sites. These sites did respond to the illumination, but interestingly, when the sites are being paired, only one of them were active for the visible light illumination.