Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 143, Issue 2, Pages 754-758Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.10.016
Keywords
ZnO; Gas detector; Cr2O3-sensitized; Electrospinning; Nanofibers
Funding
- National 863 Project [2007AA03Z324]
- National 973 Project [2007CD936203]
- NSFC [20674027, 50873045]
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Certain amount of Cr2O3 has been in si tu added to ZnO nanofibers during the electrospinning process and subsequent calcination to form Cr2O3-sensitized ZnO (C-s-Z) nanofibers. The morphology and structure of the as-prepared nanofibers have been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and X-ray diffraction (XRD). The effect of the Cr2O3 component in C-s-Z nanofibers on the gas sensing properties has been evaluated by the responses to ethanol vapor. The results have showed that the C-s-Z nanofibers containing 4.5 wt% Cr2O3 exhibit the best sensing properties to ethanol vapor. The response to 1 ppm ethanol vapor is as high as 3.6, and the response and recovery time ate about 1 and 5 s, respectively. In addition, the as-prepared sensors exhibit excellent selectivity and stability. These results indicate that the C-s-Z electrospun composite nanofibers can be used in fabricating high performance gas sensors. (C) 2009 Elsevier B.V. All rights reserved.
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