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利用溶剂热法合成了一维的氧化钨纳米线,通过掺入适量单壁碳纳米管(SWNT)制备了基于氧化钨纳米线-SWNT复合结构的室温气敏元件并评价了其对NO_2气体的室温敏感性能.利用X射线与扫描电子显微镜表征了材料的微结构,结果表明,合成的氧化钨纳米线具有单斜的W_(18)O_(49)结构,复合材料中SWNT被包埋在氧化钨纳米线中间.气敏性能测试结果表明,氧化钨纳米线-SWNT复合结构气敏元件在室温下对NO_2气体表现出了高的灵敏度和超快的响应特性;较低的SWNT掺入量对获得好的气敏性能有利.分析了基于复合结构材料气敏元件的可能的气敏机理,认为元件良好的室温敏感性能与SWNT掺入在复合结构材料中引入大量的贯穿气孔和p-n异质结有关.
A one-dimensional tungsten oxide nanowire was synthesized by solvothermal method. The room temperature gas sensor based on the tungsten oxide nanowire-SWNT composite structure was prepared by adding appropriate amount of single-wall carbon nanotubes (SWNTs) The results show that the synthesized tungsten oxide nanowires have a monoclinic W 18 O 49 structure, and the SWNTs in the composites are embedded in the oxidized Tungsten nanowires intermediate gas sensitization test results show that the tungsten oxide nanowires -SWNT composite structure of gas sensor for NO 2 gas at room temperature showed high sensitivity and ultrafast response characteristics; lower SWNT incorporation of Good gas sensing performance is obtained.A possible gas sensing mechanism based on composite structure gas sensors is analyzed and it is considered that the good room temperature sensitivity of the device and the introduction of SWNT into the composite structure material introduce a large number of through pores and pn heterojunction related.