Abstract
Abstract Pure and Mo-doped ZnO hollow nanofibers were prepared by single capillary electrospinning and their gas sensing characteristicstoward 5 ppm ethanol, trimethylamine (TMA), CO and H 2 were investigated. The gas responses and responding kinetics were depen-dent upon sensing temperature and Mo doping. Mo-doped ZnO hollow nanofibers showed high response to 5 ppm TMA ( R a /R g = 111.7,R a : resistance in air, R g : resistance in gas) at 400 o C, while the responses of pure ZnO hollow nanofibers was low (R a /R g = 47.1). In addi-tion, the doping of Mo enhanced selectivity toward TMA. The enhancement of gas response and selectivity to TMA by Mo dopingto ZnO nanofibers was discussed in relation to the interaction between basic analyte gas and acidic additive materials. Keywords: ZnO nanofiber, Molybdenum, Gas sensor, Oxide semiconductor, Electrospinning 1. 서론 폭발성가스, 환경가스, 독성가스, 농수산물에서 발생되는 가스등의 미량검지를 위해서 감도 및 선택성이 우수한 가스센서가요구되고 있다. 산화물 반도체형 가스센서는 감응물질의 표면과피검 가스의 반응에 의한 저항 변화를 이용하여 가스를 검출한다[1]. 가스 감응물질로 SnO
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