Porous α-Fe2O3 decorated by Au nanoparticles and their enhanced sensor performance

被引：109

作者：

Liu, Xianghong ^{[1
]}

Zhang, Jun ^{[1
]}

Guo, Xianzhi ^{[1
]}

Wu, Shihua ^{[1
]}

Wang, Shurong ^{[1
]}

机构：

[1] Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China

来源：

NANOTECHNOLOGY | 2010年 / 21卷 / 09期

基金：

中国国家自然科学基金;

关键词：

GAS SENSORS; DOPED ALPHA-FE2O3; CO OXIDATION; METAL-OXIDES; HOLLOW SPHERES; PARTICLES; NANORODS; OXYGEN; SNO2; ROUTE;

D O I：

10.1088/0957-4484/21/9/095501

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Porous alpha-Fe2O3 was synthesized by simple calcination of a beta-FeOOH precursor derived from a facile hydrothermal method. In the hydrothermal process, only FeCl3 center dot 6H(2)O was used as the source material and no templates or pore-directing agents were needed. The as-prepared porous alpha-Fe2O3 was further employed as a support for loading Au nanoparticles (AuNPs). Due to the advantages of porous nanostructures (large surface area and facile gas diffusion) and the catalytic capability of AuNPs, the derived AuNP-supported porous alpha-Fe2O3 was further investigated for gas sensor applications using ethanol as a probe molecule. Obtained results showed that the AuNP-supported porous alpha-Fe2O3 exhibited a much higher response in comparison to pure alpha-Fe2O3. The enhanced sensor properties are attributed to the unique porous structures of the alpha-Fe2O3 support and active AuNPs for promoting sensing reactions, as well as the synergic electronic interaction between Au and alpha-Fe2O3. It is expected that noble metals such as Ag, Pt and Pd can also be supported on other porous metal oxide semiconductors to explore superior properties of functional nanomaterials.

引用

页数：8

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