Low-temperature growth and ethanol-sensing characteristics of quasi-one-dimensional ZnO nanostructures |
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Authors: | Nguyen Van Hieu Nguyen Duc Chien |
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Institution: | a International Training Institute for Materials Science (ITIMS), Vietnam b Hanoi Advanced School of Science and Technology (HAST), Vietnam c Institute of Engineering Physics (IEP), Hanoi University of Technology, No. 1 Dai Co Viet, Hanoi, Vietnam |
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Abstract: | ZnO nanorods, nanobelts, nanowires, and tetrapod nanowires were synthesized via thermal evaporation of Zn powder at temperatures in the range 550-600 °C under flow of Ar or Ar/O2 as carrier gas. Uniform ZnO nanowires with diameter 15-25 nm and tetrapod nanowires with diameter 30-50 nm were obtained by strictly controlling the evaporation process. Our experimental results revealed that the concentration of O2 in the carrier gas was a key factor to control the morphology of ZnO nanostructures. The gas sensors fabricated from quasi-one-dimensional (Q1D) ZnO nanostructures exhibited a good performance. The sensor response to 500 ppm ethanol was up to about 5.3 at the operating temperature 300 °C. Both response and recovery times were less than 20 s. The gas-sensing mechanism of the ZnO nanostructures is also discussed and their potential application is indicated accordingly. |
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Keywords: | Nanowires Nanorods Nanobelts Gas sensor |
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