An ultrahigh-sensitivity and selective sensing material for ethanol: alpha-/gamma-Fe2O3 mixed-phase mesoporous nanofibers
An ultrahigh-sensitivity and selective sensing material for ethanol: alpha-/gamma-Fe2O3 mixed-phase mesoporous nanofibers
复制标题
乙醇超高灵敏度选择性传感材料：α-/γ-Fe2O3混相介孔纳米纤维
DOI：
10.1007/s12274-015-0867-y
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发表时间：
2015
期刊：
影响因子：
9.9
通讯作者：
Wu Qingsheng
中科院分区：
文献类型：
--
作者：
Yan Shuang;Zan Guangtao;Wu Qingsheng
A process for synthesizing Fe2O3based on electrospinning and the hard-template method was proposed such that the crystal phase of Fe2O3could be tailored with precision. Mesoporous γ-Fe2O3, α-/γ-Fe2O3, and α-Fe2O3nanofibers could be fabricated successfully by changing the synthesis parameters. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction analyses, Raman spectroscopy, and nitrogen adsorption–desorption analyses were used to characterize the structures of the synthesized products. The optimal calcination conditions for preparing α-/γ-Fe2O3nanofibers with the highest ethanol response were determined through ethanol-sensing measurements. The mixed-phase material exhibited a significantly higher sensitivity than the corresponding purephase ones. The superior ethanol-sensing performance of the α-/γ-Fe2O3nanofibers suggested that they may be suitable for use in alcohol sensing. Hence, a novel strategy for improving the sensing performance of metal oxide semiconductors is to assemble the different crystalline forms of the same metal oxide in one structure. Finally, the mechanism responsible for the sensing performance of α-/γ-Fe2O3being higher than those of γ-Fe2O3and α-Fe2O3was elucidated on the basis of data from X-ray photoelectron spectroscopy and resistance measurements.
