Evidence for the Predominance of Subsurface Defects on Reduced Anatase TiO2(101)

被引：187

作者：

He, Yunbin ^{[1
]}

Dulub, Olga ^{[1
]}

Cheng, Hongzhi ^{[2
]}

Selloni, Annabella ^{[2
]}

Diebold, Ulrike ^{[1
]}

机构：

[1] Tulane Univ, Dept Phys, New Orleans, LA 70118 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 10期

基金：

美国国家科学基金会;

关键词：

WATER; PHOTOCATALYSIS; FERROMAGNETISM; DISSOCIATION; PRINCIPLES; SURFACES; TIO2;

D O I：

10.1103/PhysRevLett.102.106105

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Scanning tunneling microscopy (STM) images taken on a freshly cleaved anatase TiO2(101) sample show an almost perfect surface with very few subsurface impurities and adsorbates. Surface oxygen vacancies are not typically present but can be induced by electron bombardment. In contrast, a reduced anatase (101) crystal shows isolated as well as ordered intrinsic subsurface defects in STM, consistent with density functional theory (DFT) calculations which predict that O vacancies (V-O's) at subsurface and bulk sites are significantly more stable than on the surface.

引用

页数：4

共 27 条

[1] Visible-light photocatalysis in nitrogen-doped titanium oxides [J].