论文部分内容阅读
采用简单水热法制备了六方相氧化钨纳米线,并采用X射线粉末衍射仪、扫描电镜、透射电镜、X射线光电子分光仪和Brunauer-Emmett-Teller法等分析手段和方法表征纳米线的各项性能。研究了水热反应时间对水热反应产物结构、形貌和比表面积的影响。将该纳米线用丝网印刷法制备成敏感膜,经350℃烧结1h后,测试了其在200～350℃的温度范围内对低浓度[(1～100)×10-6]CO气体的气敏性能,结果表明:敏感膜具有良好的响应恢复特性和较高的稳定性及重复性,在350℃时,其灵敏度高达4.8;对同种浓度的CO气体,经多次重复测试后其电阻值仍能升高或降低到同一水平;随测试温度的升高,该纳米线敏感膜的灵敏度基本上呈线性增加的趋势。
Hexagonal tungsten oxide nanowires were prepared by a simple hydrothermal method and characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller method Item performance. The effects of hydrothermal reaction time on the structure, morphology and specific surface area of hydrothermal reaction products were investigated. The nanowires were prepared by the screen printing method into a sensitive film. After being sintered at 350 ° C. for 1 h, the nanofibers were tested for their low concentration of [(1~100) × 10 -6] CO gas in the temperature range of 200~350 ° C. The results show that the sensitive membrane has good response and recovery characteristics, high stability and repeatability, and its sensitivity is as high as 4.8 at 350 ℃. For the same concentration of CO gas, The resistance value can still be increased or decreased to the same level. With the increase of the test temperature, the sensitivity of the nanowire-sensitive film tends to increase substantially linearly.