폴리피롤과 산화주석 복합재료를 이용한 센서의 가스 검지 특성
Gas sensing property of polypyrrole and SnO2 composite
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Abstract
Conducting polymer (Polypyrrole) and Tin oxide (SnO2) composite films have been fabricated with layer-by-layer technique. SnO2 layer was screen-printed on Al2O3 substrate and then was dip-coated with polypyrrole (Ppy). The microstructures of composite films were evaluated by a field emission scanning electron microscope (FE-SEM) and FT-IR spectral analysis. The change in sensitivity to various VOCs was observed. The target VOCs were methanol, ethanol, benzene and toluene. The sensitivities of the Ppy/SnO2 sensor to benzene and toluene were very low at 1000ppm (2.1%, 1.5%), while the sensitivities to methanol and ethanol was high (9%, 11%). It indicates that the sensors have selectivity to alcoholic gases such as methanol and ethanol.
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