Improved selective acetone sensing properties of Co-doped ZnO nanofibers by electrospinning |
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Authors: | Li LiuAuthor Vitae Shouchun LiAuthor VitaeJuan ZhuangAuthor Vitae Lianyuan WangAuthor VitaeJinbao ZhangAuthor Vitae Haiying LiAuthor VitaeZhen LiuAuthor Vitae Yu HanAuthor VitaeXiaoxue JiangAuthor Vitae Peng ZhangAuthor Vitae |
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Affiliation: | a State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Qianjing Street 2699#, Changchun 130012, PR China b School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, PR China c College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130012, PR China |
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Abstract: | Pure and Co-doped (0.3 wt%, 0.5 wt%, and 1 wt%) ZnO nanofibers are synthesized by an electrospinning method and followed by calcination. The as-synthesized nanofibers are characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray (EDX) spectroscopy. Comparing with pure ZnO nanofibers, Co-doped nanofibers exhibit improved acetone sensing properties at 360 °C. The response of 0.5 wt% Co-doped ZnO nanofibers to 100 ppm acetone is about 16, which is 3.5 times larger than that of pure nanofibers (about 4.4). The response and recovery times of 0.5 wt% Co-doped ZnO nanofibers to 100 ppm acetone are about 6 and 4 s, respectively. Moreover, Co-doped ZnO nanofibers can successfully distinguish acetone and ethanol/methanol, even in a complicated ambience. The high response and quick response/recovery are based on the one-dimensional nanostructure of ZnO nanofibers combining with the Co-doping effect. The selectivity is explained by the different optimized operating temperatures of Co-doped ZnO nanofibers to different gases. |
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Keywords: | ZnO Semiconductors Electrospinning Nanofibers Gas sensors |
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