Ag/ZnO-rGO 하이브리드 나노구조 기반 C2H2 가스센서의 제작과 그 특성
Fabrication of C2H2 Gas Sensors Based on Ag/ZnO-rGO Hybrid Nanostructures and Their Characteristics
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In this work, pure hierarchical ZnO structure was prepared using a simple hydrothermal method, and Ag nanoparticles doped hierarchical ZnO structure was synthesized uniformly through photochemical route. The reduced graphene oxide (rGO) has been synthesized by typical Hummer’s method and reduced by hydrazine. Prepared Ag/ZnO nanostructures are uniformly dispersed on the surface of rGO sheets using ultrasonication process. The synthesized samples were characterized by SEM, TEM, EDS, XRD and PL spectra. The average size of prepared ZnO microspheres was around 2~3 μm and showed highly uniform. The average size of doped-Ag nanoparticles was 50 nm and decorated into ZnO/rGO network. The C2H2 gas sensing properties of as-prepared products were investigated using resistivity-type gas sensor. Ag/ZnO-rGO based sensors exhibited good performances for C2H2 gas in comparison with the Ag/ZnO. The C2H2 sensor based on Ag/ZnO-rGO had linear response property from 3~1000 ppm of C2H2 concentration at working temperature of 200oC. The response values with 100 ppm C2H2 at 200oC were 22% and 78% for Ag/ZnO and Ag/ZnO-rGO, respectively. In additions, the sensor still shows high sensitivity and quick response/recovery to C2H2 under high relative humidity conditions. Moreover, the device shows excellent selectivity towards to C2H2 gas at optimal working temperature of 200oC.
Abstract
In this work, pure hierarchical ZnO structure was prepared using a simple hydrothermal method, and Ag nanoparticles doped hierarchical ZnO structure was synthesized uniformly through photochemical route. The reduced graphene oxide (rGO) has been synthesized by typical Hummer’s method and reduced by hydrazine. Prepared Ag/ZnO nanostructures are uniformly dispersed on the surface of rGO sheets using ultrasonication process. The synthesized samples were characterized by SEM, TEM, EDS, XRD and PL spectra. The average size of prepared ZnO microspheres was around 2~3 μm and showed highly uniform. The average size of doped-Ag nanoparticles was 50 nm and decorated into ZnO/rGO network. The C2H2 gas sensing properties of as-prepared products were investigated using resistivity-type gas sensor. Ag/ZnO-rGO based sensors exhibited good performances for C2H2 gas in comparison with the Ag/ZnO. The C2H2 sensor based on Ag/ZnO-rGO had linear response property from 3~1000 ppm of C2H2 concentration at working temperature of 200oC. The response values with 100 ppm C2H2 at 200oC were 22% and 78% for Ag/ZnO and Ag/ZnO-rGO, respectively. In additions, the sensor still shows high sensitivity and quick response/recovery to C2H2 under high relative humidity conditions. Moreover, the device shows excellent selectivity towards to C2H2 gas at optimal working temperature of 200oC.
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