石墨烯为载体的Pd/SnO2合成及其CO气敏性能研究

采用沉淀法和超声浸渍法制备出不同石墨烯(G)载体量(Gx%)的二氧化锡(SnO2)复合材料,并成功负载贵金属钯(Pd)得到Pd1.5%/SnO2/Gx%复合材料。分析比较Pd1.5%/SnO2纳米复合材料及其石墨烯载体量分别为0.1%、0.25%、0.5%、0.75%(质量分数)的Pd1.5%/SnO2/Gx%复合材料对CO气敏性能。结果表明:石墨烯的加入在抑制SnO2纳米颗粒团聚的同时也提高了其均匀分散程度,从而提升Pd1.5%/SnO2/Gx%对CO的灵敏度。其中,Pd1.5%/SnO2/G0.25%对CO表现出更好的传感特性。在最佳工作温度75℃下,该复合材料对115 mg/m^3CO的灵敏度值为56.2,响应时间和恢复时间分别为7 s和10 s,且当CO质量浓度降至5.75 mg/m^3时,该传感器仍对CO具有较好响应。

A carbon monoxide sensor based on single-walled carbon nanotubes doped with copper chloride

A carbon monoxide gas sensor based on single-walled carbon nanotube （SWCNT） has been developed for detection of carbon monoxide （CO） at room temperature. Copper chloride （CuC1） was mixed with SWNT by mechanical blending. The thin film was deposited on interdigitated electrodes by using airbrush technology. This paper described the fabrication of the sensor for detecting carbon monoxide with concentrations from 20 ppm to 100 ppm. The performance of CO gas sensor was measured by using relevant apparatus to obtain the continuous sensor electric resistance change on exposure to CO and air atmosphere at room temperature, respectively. The results exhibited that the senor presented a larger sensitivity and a good recoverability. The experimental results suggested the potential use of CuC1 doped SWCNT for CO detecting.