Research On Key Technology And Performance Optimization Of Nano-copper Oxide Gas Sensors

Driven by Industry 4.0,the rise of the Internet of Things has put forward new requirements for sensing technology.In order to meet the needs of rapid development of sensing technology,this paper aims to fabricate gas sensors which have high response.We synthesized the nano-CuO materials with high gas-sensing properties.Afterwards,we optimized and sensitized it by decorating noble metal on the surface of CuO and synthetizing nanocomposites in order to solve the problems of low response and inadequate selectivity of gas sensors.The specific research contents are as follows:The research status of gas sensors was analyzed,and the shortcomings and development direction of gas sensor were summarized.The mechanism of working and improvement of sensitivity of gas sensors were discussed by combining the adsorption theory,catalytic theory and heterojunction theory.We synthesized the CuO nanoclusters material which assembled from nanoparticles by solvothermal method.It was applied to resistive side-heating gas sensor and its related gas sensing performance was systematically tested.It was found that the sensor based on the nanocluster CuO had a lower detection limit which had a response of 1.6 to 10 ppm ethanol gas.Besides,the sensor also shown high response to formaldehyde,acetone and other tested gases.The noble metals Au,Pt and Ag were modified the surface of three-dimensional nano-CuO material,which was orderly assembled from Nano-sheets.The results shown that the noble metals Au,Pt and Ag can effectively improve the response of the device to ethanol gas.In addition,the response of the device to methanol,formaldehyde and acetone was significantly reduced by the Au nanoparticles.It increased the disparity of response to different gases and had obvious optimization effect on the selectivity.The CuO-ZnO nanocomposites were prepared by electrochemical method,and the effect of composite on the performance of gas sensors was researched.The CuO-ZnO nanocomposites effectively improved the response of devices to organic gases such as ethanol,formaldehyde and acetone.And the response and recovery rate of the device to ethanol gas were increased obviously.