Chemiresistive NO gas sensor based on zinc oxide nanorods

Chia Yu Lin, Po Chin Nien, Wei Yi Feng, Chii Wann Lin, Jim Tunney, Kuo Chuan Ho

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

The synthesis of zinc oxide (ZnO) nanorods and their sensing properties with respect to nitric oxide (NO) gas were studied. The ZnO nanorods were grown by the hydrothermal method onto a ZnO thin film (∼ 150 nm), which was designated as the ZnO thin film/ZnO nanorods. The ZnO thin film was pre-sputtered on the Au interdigitated electrode. By repeating the growth in a fresh precursor from one cycle to four cycles, the aspect ratio of the nanorods increased approximately from 10 to 33. For NO gas sensor application, however, the sensitivity decreased as the aspect ratio of the ZnO nanorods increased. It's very likely that higher density and higher aspect ratio of ZnO nanorods prevent NO gas from penetrating into the ZnO nanorods. The optimal operation temperature for the ZnO thin film/ZnO nanorods with an aspect ratio of 10 was found to be 240 °C for sensing NO gas. The limit of detection reached 2 ppb which is applicable for asthma diagnosis. To simulate human breath, cross-sensitivities with respect to CO2 and O2 have been tested.

原文English
頁(從 - 到)102-108
頁數7
期刊Journal of Bionanoscience
2
發行號2
DOIs
出版狀態Published - 2008 12月

All Science Journal Classification (ASJC) codes

  • 生物技術
  • 生物材料
  • 生物醫學工程

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