X-ray absorption reveals surface structure of titanium dioxide nanoparticles

被引：143

作者：

Chen, LX ^{[1
]}

Rajh, T ^{[1
]}

Jäger, W ^{[1
]}

Nedeljkovic, J ^{[1
]}

Thurnauer, MC ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA

来源：

JOURNAL OF SYNCHROTRON RADIATION | 1999年 / 6卷

关键词：

XANES; XAFS; nanoparticles; titanium dioxide; semiconductor;

D O I：

10.1107/S090904959801591X

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The structures of TiO2 nanoparticles with a 19 Angstrom diameter have been probed using Ti K-edge XANES, revealing severe distortions in Ti site environments compared to those octahedral Ti sites in bulk anatase. The distorted Ti sites are likely to adopt a pentacoordinate square pyramid geometry due to the truncation of the lattice. Upon binding ascorbic acid on the surfaces of the 19 Angstrom particles, the octahedral Ti site observed in the bulk TiO2 is largely restored. This discovery shows that the distortions in TiO2 lattice are mainly located on the surface of the particles. The distorted Ti surface sites are responsible for the binding with other small molecules, which is often a prerequisite in surface chemistry.

引用

页码：445 / 447

页数：3

共 11 条

[1] XAFS studies of surface structures of TiO2 nanoparticles and photocatalytic reduction of metal ions [J].