钨氧化物纳米材料的制备、改性及气敏性能研究

发布时间：2018-01-17 12:49

  本文关键词：钨氧化物纳米材料的制备、改性及气敏性能研究　出处：《大连海事大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： WO_3 W_(18)O_(49) 石墨烯 气敏性能

【摘要】：钨氧化物(WOx)是一种多功能金属氧化物半导体材料,以良好的气敏性能被制成传感器并广泛地应用于各个领域。WO3、W18O49为常见的钨氧化物,它们独特的晶体结构使其具有气敏检测的潜力。制备WO3纳米管、WO3纳米片及W18O49纳米纤维三种不同结构的钨氧化物纳米材料,研究其气敏性能。石墨烯能加速电子在材料表面的迁移能力增强材料活性,将石墨烯掺杂入钨氧化物纳米材料改性,改善材料气敏性能。1.采用溶剂热法合成WO3纳米管,材料比表面积达34.61m2/g。将石墨烯掺杂到WO3中制备复合材料,制成的器件和纯WO3器件的最佳工作温度均340℃,气敏器件的灵敏度随气体浓度增加而增大且没有饱和趋势。掺杂了石墨烯的气敏器件敏性能优于纯WO3,对不同气体进行测试,发现器件对乙醇气体的选择性突出,灵敏度达13.1。2.EDTA铵盐辅助合成WO3纳米片,气敏测试结果显示气敏器件对乙醇的响应-恢复时间非常短,但灵敏度和选择性有待提高。添加石墨烯对WO3材料改性,气敏器件在工作温度300℃下表现突出的气敏性能,对100mg/L乙醇气体的灵敏度为14.8,是纯WO3材料2倍多,具检测乙醇气体的潜能。3.采用水热法合成W18O49纳米纤维,纯W18O49材料最佳工作温度为370℃,掺杂石墨烯改性后不仅仅使器件工作温度减小到340℃,且对100mg/L乙醇气体表现出较好的灵敏度,较纯W18O49材料高出2倍多,对乙醇、甲醇气样具有较好的选择性。掺杂石墨烯改性能有效地改善W18O49气敏器件工作温度高、灵敏度低的缺点。
[Abstract]:Tungsten oxide (WX) is a kind of multifunctional metal oxide semiconductor material, which has been made into sensors with good gas sensitivity and has been widely used in various fields. W18O49 is a common tungsten oxide, and its unique crystal structure makes it have the potential of gas sensitive detection. WO3 nanotubes are prepared. Three kinds of tungsten oxide nanomaterials with different structures, WO3 and W18O49 nanofibers, were studied. Graphene can accelerate the mobility of electrons on the surface of the materials and enhance the activity of the materials. WO3 nanotubes were synthesized by solvothermal method by modifying graphene with tungsten oxide nanomaterials to improve the gas sensitivity of the materials. The specific surface area is 34.61m2 / g. Graphene is doped into WO3 to prepare composites. The optimum working temperature of the fabricated devices and pure WO3 devices is 340 鈩，

本文编号：1436283