摘要
Semiconducting metal oxides have been considered as effective approach for designing highperformance chemical sensing materials.In this paper,a kind of metal-organic frameworks ZIF-8 was used as sacrificed template to prepare porous ZnO hollow nanocubes for the application in gas sensing.It is found that changing calcination temperature and solvent can greatly influence the morphology of the material,which finally affects the gas sensing performance.Acetylene-sensing properties of the sensors were investigated in detail.It can be clearly seen that the material used methanol as reaction solvent with the decomposition at 350℃for 2 h(ZnO-350-M)showed the optimal formaldehyde-sensing behaviors compared with other materials prepared in this experiment.The dynamic transients of the ZnO-350-M-based sensors demonstrated a high response value(about 10),fast response and recovery rate(4 s and 4 s,respectively)and good selectivity towards 100 ppm(part per million)formaldehyde as well as a low detectable limit(1 ppm).As exemplified for the sensing inve stigation towards formaldehyde,the porous ZnO hollow nanocubes showed a significantly improved chemical sensitivity due to the highly syne rgistic effects from the well exposed surfaces,defect states and the robust ZnO.
基金
National Natural Science Foundation of China(Nos.61874048,11874348,U1831113,61974175,61974055)
Project of Science and Technology Plan of Jilin Province(No.20180414020GH)
Project of Jilin Provincial Development and Reform Commission(No.2018C040-2)。
