Preparation of NiO modified ZnO gas sensing material and its gas sensing properties for ethyl acetate
Ethyl acetate is a major contributing component in industrial production processes such as printing,where VOCs products are used as raw materials,and a convenient detection of ethyl acetate is important.In this study,NiO was modified on the fabricated ZnO nanorods by chemical precipitation method,and XRD,XPS,SEM,TEM and BET were used to characterize their morphological structure,chemical composition and specific surface area,and their gas-sensitive properties were tested with ethyl acetate as the target gas.The results showed that the trace NiO modification could effectively improve the gas-sensitive property of ZnO,and the optimal modification ratio of NiO∶ZnO was 3∶100.The response of NiO∶ZnO=3∶100 to 393.33 mg.m-3 ethyl acetate reached 101(Ra/Rg)at 290 ℃,and the response had an excellent selectivity and stability.Subsequently,the mechanism of NiO∶ZnO=(3∶100)response to ethyl acetate was explored,and the results showed that a p-n heterojunction occurred between NiO and ZnO,and the surface of NiO∶ZnO=3∶100 material trapped more electrons and generated more oxygen,which improved the gas-sensitive performance.Finally,simulation experiments for the application of gas sensors in adsorption purification of ethyl acetate were conducted to conclude that gas sensors assisting in determining the degree of adsorbent saturation has a promising application.
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