Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (06): 1080-1084.doi: 10.3866/PKU.WHXB20080629

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Gas Sensing Properties of Single ZnO Nanowire at Room Temperature

ZHENG Kai-Bo; LI Jing-Lei; SHEN Hao-Ting; SUN Da-Lin; CHEN Guo-Rong   

  1. Department of Materials Science, Fudan University, Shanghai 200433, P. R. China
  • Received:2007-12-12 Revised:2008-03-16 Published:2008-06-03
  • Contact: CHEN Guo-Rong

Abstract: ZnO nanowires with (002) oriented direction was synthesized via modified CVD method. Bottom-up assembly including photolithography/lift off was employed to fabricate gas sensor based on single ZnO nanwire with 50-300 nm in diameter and 2-10 μm in length. The as-prepared device showed gas sensitivities of 1.3 and 1.2 to oxygen and ethanol gases with concentration of 500 μL·L-1 at room temperature, and the corresponding temporal responses were 10 and 5 s, respectively. The improved gas sensing properties were attributed to the enhancement of the current-induced heating on the quasi-one-dimensional nanostructure.

Key words: ZnO, Nanowire, Gas sensor


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