BiFeO3/TiO2 core-shell structured nanocomposites as visible-active photocatalysts and their optical response mechanism

被引：130

作者：

Li, Shun ^{[1
,2
]}

Lin, Yuan-Hua ^{[1
]}

Zhang, Bo-Ping ^{[2
]}

Li, Jing-Feng ^{[1
]}

Nan, Ce-Wen ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 05期

关键词：

bismuth compounds; catalysts; nanocomposites; nanofabrication; nanoparticles; photochemistry; precipitation (physical chemistry); radiation effects; red shift; semiconductor materials; titanium compounds; ultraviolet spectra; visible spectra; HYDROGEN EVOLUTION; LIGHT; SURFACE; PHOTOELECTROLYSIS; PREDICTION; PARTICLES; ELECTRON; SYSTEMS; FILM;

D O I：

10.1063/1.3091286

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Anatase titania-coated bismuth ferrite nanocomposites (BiFeO3/TiO2) have been fabricated via a hydrothermal approach combined with a hydrolysis precipitation processing. Analysis of the microstructure and phase composition reveals that a core-shell BiFeO3/TiO2 structure can be formed, which results in a significant redshift in the UV-vis absorption spectra as compared to a simple mechanical mixture of BiFeO3-TiO2 nanopowders. The core-shell structured BiFeO3/TiO2 nanocomposites exhibit higher photocatalytic activity for photodegradation of Congo red under visible-light (lambda>400 nm) irradiation, which should be attributed to the enhancement of the quantum efficiency by separating the electrons and holes effectively. The obtained BiFeO3/TiO2 nanocomposites can be used as potential visible-light driven photocatalysts.

引用

页数：5

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