Ultrafast and Reversible Gas-Sensing Properties of ZnO Nanowire Arrays Grown by Hydrothermal Technique

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• 作者：Madhumita Sinha ; Rajat Mahapatra ; Biswanath Mondal ; Takahiro Maruyama ; Ranajit Ghosh
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：February 11, 2016
• 年：2016
• 卷：120
• 期：5
• 页码：3019-3025
• 全文大小：379K
• ISSN：1932-7455

文摘

High-quality single-crystal ZnO nanowire arrays with diameter ranging from 30 to 110 nm were synthesized using a two-step process: (1) synthesis of ZnO thin film by sol–gel technique, which was used as seed layer, and (2) oriented ZnO nanowire arrays were grown on ZnO seed layer using a hydrothermal reaction process at a low temperature of 90 °C. Experimental results reveal an ultrahigh sensitivity of ～98% to 100 ppm of H<sub>2sub> gas and 93% to 200 ppm of CO gas, an ultrafast recovery of 1 to 2 ms to CO gas with high repeatability. The current transients demonstrate the reversible type sensing to reducing gas (H<sub>2sub> or CO) detection using as-grown ZnO nanowire arrays sensor. The hydrothermally grown ZnO nanowire-array-based gas sensors may have potential application in industry without much modification.