氧化锡纳米线的制备及其乙醇气体敏感性能

采用热蒸发法成功制备氧化锡纳米线。用X射线衍射、扫描电子显微镜和透射电子显微镜对所制备纳米线的晶格结构和表面形貌进行表征。所制材料为金红石氧化锡单晶结构,纳米线直径为50~200nm,长度为5~15μm,符合气-液-固生长机制。以氧化锡为气敏材料,制备了旁热式结构气敏元件,测试该元件对浓度范围为25×10^-6 ~500×10^-6 的乙醇气体环境的敏感性能。结果表明,该元件的最佳工作温度约为260℃;在25×10^-6 和500×10^-6 的乙醇气体中,灵敏度分别为7.54和111.01,响应时间为2~20s,恢复时间为5~33s;在测试范围内灵敏度与气体浓度具有良好的线性关系;7天内重复测量误差在5%以内,稳定性较好。

Preparation and ethanol gas sensor properties of SnO2 nanowires

Tin oxide nanowires were successful prepared using thermal evaporation method. The crystal structure and surface morphology of the nanowires were characterized by X-ray diffraction, scanning electron microscope and transmission electron microscope. The as-prepared nanowires are rutile single crystal SnO2 structure, with diameter in 50-200nm, and length of 5-15μm, conforming to the gas-liquid-solid growth mechanism. The heater structure gas sensor was prepared using SnO2 nanowires as the gas sensitive material. The gas sensitive performance of the samples was tested in ethanol gas concentration range of 25×10^-6 -500×10^-6 . The results show that the best working temperature of the sensor is about 260℃;in the 25×10^-6 and 500×10^-6 ethanol gas environment, the sensitivity is 7.54 and 111.01 respectively, response time of the sensor is 2-20s, and recovery time is 5-33s;the sensitivity and the gas concentration has a good linear relationship within the measuring range;the sensor has favourable stability with less than 5% repeated measurement error in 7 days.