纳米线
材料科学
电阻率和电导率
扫描电子显微镜
脉冲激光沉积
化学气相沉积
光电子学
分析化学(期刊)
电导率
汽-液-固法
锌
纳米技术
薄膜
复合材料
化学
冶金
物理化学
色谱法
电气工程
工程类
作者
D. Zhang,S.K. Lee,Sirisha Chava,Christine Berven,V. Katkanant
标识
DOI:10.1016/j.physb.2011.06.001
摘要
Zinc oxide (ZnO) nanowires have been synthesized by using tubular furnace chemical vapor deposition technique. The morphology, chemical composition and crystal structure of as-synthesized ZnO nanowires were examined by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) techniques. Four-terminal current–voltage (I–V) measurements were employed to study the electrical conductance of ZnO nanowires under various testing gas environments for gas sensing purpose. The I–V curves at temperature ranging from 150 to 300 K were recorded in the testing chamber under vacuum. The Arrhenius plot shows perfect linear relationship between the logarithm of the current I and inverse temperature 1/T. The donor level of the semiconducting nanowires is about 326 meV. The I–V behaviors were found to be reversible and repeatable with testing gases. The electrical conductivity was enhanced by a factor of four with ambient CO gas compared to that in vacuum and other testing gases. The optoelectronic properties of the ZnO nanowires were obtained by two-terminal I–V measurement method while the nanowires were illuminated by a ruby laser. The electrical conductivity was increased by 60% when the laser was present in comparison to that when the laser was off. Those significant changes suggest that nano-devices constructed by the ZnO nanowires could be used in gas sensing and optical switching applications.
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