Novel (1 × 1)-reconstructions and native defects of TiO2 anatase (101) surface
Novel (1 × 1)-reconstructions and native defects of TiO2 anatase (101) surface
复制标题
新颖的 (1 × 1)-TiO2 锐钛矿 (101) 表面的重建和原生缺陷
DOI:
10.1016/j.apsusc.2017.02.052
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发表时间:
2017-05
影响因子:
6.7
通讯作者:
Yuanxu Wang
中科院分区:
文献类型:
--
作者:
Qinggao Wang;Fengzhu Ren;Huafeng Dong;Yuanxu Wang
In this paper, reconstructions and native defects of TiO2anatase (101) surface are studied using the state-of-the-art theoretical method. We find that O interstitials are dominated defects at an oxidization environment. These O interstitials induce acceptor energy levels, corresponding to an indirect-direct band transition and a bandgap narrowing. And thus, the experimental result that an O-rich anatase TiO2has the higher photocatalytic activity can be understood. The formation of O vacancies and Ti interstitials becomes feasible at a reduced condition, and reconstructed TiO2anatase (101)-(1 × 1) structures present with increasing reduction degree. Furthermore, the Fermi levels of defected and reconstructed TiO2anatse (101) can be modulated in a wide range (i.e., nearly the whole band gap), which are different from those of TiO2rutile (110).
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