Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 155, Issue 2, Pages 782-788Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.01.047
Keywords
ZnO; Semiconductors; Electrospinning; Nanofibers; Gas sensors
Funding
- Department of Environmental Protection of Jilin Province [2009-22]
- Jilin Provincial Science & Technology Department [20100344]
- National Innovation Experiment Program for University Students [2009C65125, 2010C65188]
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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 degrees 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 4s, 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. (C) 2011 Elsevier B.V. All rights reserved.
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