| 초록 |
With the development of industries, the amount of NO2 emission has increased rapidly since the main sources of NO2 include automobiles and combustion of fossil fuels in power plants. In this sense, flexible NO2 gas sensing platform that can be operated at room temperature is highly required. In this work, we synthesized Pt and ZnO sensitized nanoporous reduced graphene oxide (Pt-ZnO@NPRGO) derived from metal-organic framework (MOF) and graphene oxide (GO) as room temperature NO2 sensing layer. Zn based zeolite imidazole framework (ZIF-8) were grown on the GO due to the strong interaction between GO and ZIF clusters. Then, Pt ions were encapsulated in the cavity of ZIF-8 using polyvinylpyrrolidone as surfactant and reduced to Pt nanoparticles (NPs) by using sodium borohydride. During the carbonization, ZIF-8 were converted into ZnO NPs embedded porous carbon nanocage, while GO were thermally reduced thereby forming Pt-ZnO@NPRGO. Due to their exceptionally high surface area and catalytic performances of Pt and ZnO NPs, the Pt-ZnO@NPRGO exhibited excellent sensing performances toward NO2 in terms of sensitivity, selectivity, and reversible response/recovery kinetics even at room temperature. Moreover, owing to the two-dimensional nature of GO, Pt-ZnO@NPRGO exhibited superior stability in bending state on flexible sensing substrate, i.e., colorless polyimide, showing potential feasibility of Pt-ZnO@NPRGO for application of wearable chemiresistors. |
