Low temperature solution-based synthesis of porous flower-like α-Fe2O3 superstructures and their excellent gas-sensing properties

被引：82

作者：

Yan, Wei ^{[1
]}

Fan, Huiqing ^{[1
]}

Zhai, Yuchun ^{[1
]}

Yang, Chao ^{[1
]}

Ren, Pengrong ^{[1
]}

Huang, Limei ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2011年 / 160卷 / 01期

关键词：

alpha-Fe2O3; Low-temperature synthesis; Porous architectures; Gas sensors; PHOTOCATALYTIC PROPERTIES; FORMATION MECHANISM; FACILE ROUTE; GROWTH; NANOSTRUCTURES; NANOTUBES; HEMATITE; NANORODS; DUMBBELL; SENSOR;

D O I：

10.1016/j.snb.2011.09.080

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A facile solution approach was employed to synthesize flower-like alpha-FeOOH precursors by using FeSO4 center dot 7H(2)O and CO(NH2)(2) as raw materials at 80 degrees C for 6h without any template and surfactant. After annealing in air at 500 degrees C for 2h, the porous flower-like alpha-Fe2O3 superstructures were successfully obtained, whose morphological feature is characterized as self-assembled by porous nanorods with an average length of 0.1-1.0 mu m and diameter of 50-150 nm. Transmission electron microscopy (TEM) images show that there are many porous walls with a pore size of about 10 nm on the surface. As a demonstration of potential application for gas-sensing materials, the porous flower-like superstructures exhibited short response/recovery time within 6/3s. and presented a much higher gas response than alpha-Fe2O3 nanoparticles aggregations towards different concentrations of ethanol, methanol and acetone. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：1372 / 1379

页数：8

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