Synthesis of brush-like ZnO nanowires and their enhanced gas-sensing properties
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In this paper, brush-like ZnO nanowires were synthesized by two-step method combining electrospinning and hydrothermal. The phase purity, morphology, and structure of the brush-like ZnO hierarchical structures were characterized, which exhibited the improved surface area, comparing with ZnO nanofibers. The gas-sensing experiments were carried out on brush-like ZnO nanowires and ZnO nanofibers sensors under optimum working temperature. The highest response of brush-like ZnO nanowires to 100 ppm toluene and CO can reach to 12.7 and 5.9, respectively, which was much higher than that of ZnO nanofibers. Moreover, the brush-like ZnO nanowires sensor also shows fast response/recovery time to toluene (9/4 s) and CO (6/2 s), low detection limit (1 ppm to toluene). The measured results demonstrate that brush-like ZnO nanowires are potential as a novel sensing material for practical gas-sensing applications.
KeywordsComposite Nanofibers Hierarchical Nanostructures Unique Hierarchical Structure
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant Nos. 51205274 and 51205276), the Shanxi Province Science Foundation for Youths (Grant No. 2013021017-2), the Shanxi Scholarship Council of China (Grant No. 2013-035), Doctoral Fund of Ministry of Education of China (Grant No. 20121402120008), China Postdoctoral Science Foundation (Grant No. 2013M530894), Graduate Education Innovation Fund (Grant No. 02100738), Technology Foundation for Selected Overseas Shanxi Scholar ( 95), Science and Technology Major Project of the Shanxi Science and Technology Department (Grant No. 20121101004), and Key Disciplines Construction in Colleges and Universities of Shanxi (Grant No.  45).