Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 160, Issue 1, Pages 1372-1379Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.09.080
Keywords
alpha-Fe2O3; Low-temperature synthesis; Porous architectures; Gas sensors
Funding
- National Nature Science Foundation [51172187]
- SPDRF
- MOE [B08040]
- Xi'an Science and Technology Foundation [XA-AM-201003]
- Fundamental Research Foundation [NPU-FFR-200703]
- Doctorate Foundation of NPU [CX201006]
- SKLSP of China [40-QZ-2009]
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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.
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