Ag가 도핑된 계층적 ZnO 나노구조 기반 C2H2 가스센서의 제작과 그 특성
Fabrication of C2H2 Gas Sensors Based on Ag-Doped Hierarchical ZnO Nanostructures and Their Characteristics
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This paper describes the fabrication and characteristics of C2H2 gas sensor based on Ag-doped hierarchical ZnO nanostructures. In this work, a pure hierarchical ZnO structure was prepared using a simple hydrothermal method, and Ag anoparticles doped the hierarchical ZnO structure were uniformly synthesized through photochemical route. The synthesized samples were characterized by SEM, TEM, EDS, XRD and PL spectra. Average size of prepared ZnO structures was around 2~3 μm and showed highly uniform. The average size of Ag nanoparticles was 70 nm. The gas sensing properties of as-prepared products were investigated using resistivity-type gas sensors. 5 at% Ag-doped ZnO based sensors exhibited good performances for C2H2 gas in comparison with the un-doped one. The sensor based on Ag-doped hierarchical ZnO structures had linear response property from 5~1000 ppm of C2H2 concentration at working temperature of 200°C. The response values with 100 ppm C2H2 at 200°C were 10% and 75% for pure and 5 at% Ag-doped hierarchical ZnO nanostructures, respectively. Moreover, the device showed excellent selectivity towards to C2H2 gas at optimal working temperature of 200°C.
Abstract
This paper describes the fabrication and characteristics of C2H2 gas sensor based on Ag-doped hierarchical ZnO nanostructures. In this work, a pure hierarchical ZnO structure was prepared using a simple hydrothermal method, and Ag anoparticles doped the hierarchical ZnO structure were uniformly synthesized through photochemical route. The synthesized samples were characterized by SEM, TEM, EDS, XRD and PL spectra. Average size of prepared ZnO structures was around 2~3 μm and showed highly uniform. The average size of Ag nanoparticles was 70 nm. The gas sensing properties of as-prepared products were investigated using resistivity-type gas sensors. 5 at% Ag-doped ZnO based sensors exhibited good performances for C2H2 gas in comparison with the un-doped one. The sensor based on Ag-doped hierarchical ZnO structures had linear response property from 5~1000 ppm of C2H2 concentration at working temperature of 200°C. The response values with 100 ppm C2H2 at 200°C were 10% and 75% for pure and 5 at% Ag-doped hierarchical ZnO nanostructures, respectively. Moreover, the device showed excellent selectivity towards to C2H2 gas at optimal working temperature of 200°C.
참고문헌 (12)
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