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Enhanced room temperature gas sensing properties of low temperature solution processed ZnO/CuO heterojunction

机译：低温固溶处理的ZnO / CuO异质结的增强的室温气体传感特性

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摘要

The development of room temperature gas sensors having response towards a specific gas is attracting researchers nowadays in the field. In the present work, room temperature (29 °C) ethanol sensor based on vertically aligned ZnO nanorods decorated with CuO nanoparticles was successfully fabricated by simple cost effective solution processing. The heterojunction sensor exhibits better sensor parameters compared to pristine ZnO. The response of the heterojunction sensor to 50 ppm ethanol is, at least, 2-fold higher than the response of the ZnO bare sensor. Also the response and recovery time of ZnO/CuO sensor to 50 ppm ethanol are of 9 and 420 s whereas the values are 16 and 510 s respectively for ZnO sensor. The vertical alignment of ZnO nanorods as well as its surface modification by CuO nanoparticles increased the effective surface area of the device and the formation of p-CuO-ZnO junction at the interface are the reasons for the improved performance at room temperature. In addition to ethanol, the fabricated device has the capability to detect the presence of reducing gases like hydrogen sulfide and ammonia at room temperature.
机译：对特定气体有反应的室温气体传感器的发展吸引了当今该领域的研究人员。在当前的工作中，通过简单的具有成本效益的溶液处理成功地制造了基于垂直排列的，用CuO纳米颗粒装饰的ZnO纳米棒的室温（29°C）乙醇传感器。与原始ZnO相比，异质结传感器具有更好的传感器参数。异质结传感器对50 ppm乙醇的响应至少比ZnO裸传感器的响应高2倍。 ZnO / CuO传感器对50 ppm乙醇的响应和恢复时间分别为9和420 s，而ZnO传感器的响应和恢复时间分别为16和510 s。 ZnO纳米棒的垂直排列及其通过CuO纳米颗粒进行的表面修饰增加了器件的有效表面积，并且在界面处形成p-CuO / n-ZnO结是室温下性能提高的原因。除乙醇外，制造的装置还具有在室温下检测还原性气体（如硫化氢和氨气）的能力。

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