Institute of Condensed Matter Physics, Linyi University, Linyi, Shandong 276000, China.
School of science, Linyi University, Linyi, Shandong 276000, China.
Sci Rep. 2017 Mar 2;7:43887. doi: 10.1038/srep43887.
Gas sensors with high sensitivity at and below room temperature, especially below freezing temperature, have been expected for practical application. The lower working temperature of gas sensor is better for the manufacturability, security and environmental protection. Herein, we propose a HS gas sensor with high sensitivity at and below room temperature, even as low as -30 °C, based on CuO/CoO nano/microstructure heteroarrays prepared by 2D electrodeposition technique. This heteroarray was designed to be a multi-barrier system, and which was confirmed by transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy and scanning probe microscopy. The sensor demonstrates excellent sensitivity, sub-ppm lever detection, fast response, and high activity at low temperature. The enhanced sensing property of sensor was also discussed with the CuO/CoO p-p heterojunction barrier modulation and CuS conductance channel. We realize the detection of the noxious HS gas at ultra-low temperature in a more security and environmental protection way.
人们一直期待能够获得在室温甚至是更低温度（尤其是在冰点以下）下具有高灵敏度的气体传感器，因为更低的工作温度更有利于气体传感器的制造、使用安全和环保。在此，我们提出了一种基于二维电沉积技术制备的 CuO/CoO 纳米/微米结构异质结构的 HS 室温甚至是低温（低至-30°C）下具有高灵敏度的气体传感器。该异质结构设计为多势垒系统，这一结构通过透射电子显微镜、扫描电子显微镜、X 射线光电子能谱和扫描探针显微镜得到了证实。该传感器在低温下表现出优异的灵敏度、亚ppm 级检测下限、快速响应和高活性。还通过 CuO/CoO p-p 异质结势垒调制和 CuS 电导通道讨论了传感器增强的传感性能。我们以更加安全和环保的方式实现了对超低温有害 HS 气体的检测。
