Electron-induced oxygen desorption from the TiO2(011)-2x1 surface leads to self-organized vacancies
Electron-induced oxygen desorption from the TiO2(011)-2x1 surface leads to self-organized vacancies
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DOI：
10.1126/science.1144787
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发表时间：
2007-08-24
期刊：
影响因子：
56.9
通讯作者：
Diebold, Ulrike
中科院分区：
文献类型：
--
作者：
Dulub, Olga;Batzill, Matthias;Diebold, Ulrike
当低能电子撞击二氧化钛表面时，可能会导致表面氧的解吸。通过扫描隧道显微镜分析了用能量为 300 电子伏特的电子照射 TiO2(011)-2x1 表面而产生的氧空位。从原始表面解吸氧气的横截面被发现为 9 (+/- 6) x 10(-17) 平方厘米，这意味着初始电子激发以接近一致的概率转化为原子运动。一旦 O 空位形成，其最近和次近氧邻居的解吸截面分别减少 100 和 10 倍。这种特定位置的解吸概率导致了氧空位的一维阵列。
When low-energy electrons strike a titanium dioxide surface, they may cause the desorption of surface oxygen. Oxygen vacancies that result from irradiating a TiO2(011)-2x1 surface with electrons with an energy of 300 electron volts were analyzed by scanning tunneling microscopy. The cross section for desorbing oxygen from the pristine surface was found to be 9 (+/- 6) x 10(-17) square centimeters, which means that the initial electronic excitation was converted into atomic motion with a probability near unity. Once an O vacancy had formed, the desorption cross sections for its nearest and next-nearest oxygen neighbors were reduced by factors of 100 and 10, respectively. This site-specific desorption probability resulted in one-dimensional arrays of oxygen vacancies.