Effect of Heterojunction on the Behavior of Photogenerated Charges in Fe3O4@Fe2O3 Nanoparticle Photocatalysts

被引：116

作者：

Wei, Xiao ^{[1
,2
]}

Xie, Tengfeng ^{[1
]}

Peng, Linlin ^{[1
]}

Fu, Wei ^{[2
]}

Chen, Jiesheng ^{[2
]}

Gao, Qian ^{[3
]}

Hong, Guangyan ^{[3
]}

Wang, Dejun ^{[1
]}

机构：

[1] Jilin Univ, Coll Chem, State Key Lab Theoret & Computat Chem, Changchun 130023, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China

[3] Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Rare Earth Chem & Phys, Changchun 130012, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 17期

基金：

中国国家自然科学基金;

关键词：

SURFACE; PHOTOVOLTAGE; CONDUCTION; EFFICIENT; GROWTH;

D O I：

10.1021/jp111250z

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The behavior of photogenerated charges in the Fe3O4@Fe2O3 core/shell nanoparticles with high photocatalytic activity have been investigated by surface photovoltage (SPV) spectroscopy and transient photovoltage (TPV) measurements. The single-phase Fe3O4 and Fe2O3 particles as references have been investigated simultaneously. The results demonstrate that the junction formation in the Fe3O4@Fe2O3 nanoparticles significantly affects the separation, transport, and recombination of photogenerated charges and even changes the transport direction and recombination velocity. And the mechanisms here have been discussed in detail. These results are helpful in understanding the photoelectric process of nanoscaled materials with the heterojunction structures and further utilizing the photoelectric materials and devices.

引用

页码：8637 / 8642

页数：6

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