Novel hexagonal WO3 nanopowder with metal decorated carbon nanotubes as NO2 gas sensor
Novel hexagonal WO3 nanopowder with metal decorated carbon nanotubes as NO2 gas sensor
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DOI：
10.1016/j.snb.2008.02.006
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发表时间：
2008-07-28
影响因子：
8.4
通讯作者：
Ionescu, Radu
中科院分区：
文献类型：
--
作者：
Balazsi, Csaba;Sedlackova, Katarina;Ionescu, Radu
采用酸沉淀法从钨酸钠溶液中制备了六方相氧化钨（hex-WO 3）纳米粉体。纳米粉体的TEM分析表明，六方纳米颗粒的平均尺寸为50-100 nm。通过将少量的碳纳米管嵌入到六方钨基体中，制备了新型的杂化复合材料。在碳纳米管中加入金属纳米团簇（Ag，Au），以提高薄膜的气敏性能。多壁碳纳米管的加入降低了六方钨纳米复合材料对NO2有害气体的敏感温度范围。相比之下，hex-WO 3对NO2的敏感性在150 ° C和250 ° C之间的温度范围内，而hex-WO 3/MWCNTs复合材料在室温下对NO2气体敏感。(C)2008 Elsevier B. V.保留所有权利。
In this work, hexagonal tungsten oxide (hex-WO3) nanopowders were prepared by acidic precipitation from a sodium tungstate solution. TEM analysis of nanopowders showed that the average size of the hexagonal nanoparticles was 50-100 nm. Novel hybrid composites were fabricated by embedding a low amount of carbon nanotubes into the hex-WO3 matrix. Metallic nanoclusters (Ag, Au) were added to the carbon nanotubes for improving the gas sensing properties of the films. The addition of MWCNTs lowered the temperature range of sensitivity of the hex-WO3 nanocomposites to NO2 hazardous gas. In comparison, the sensitivity of hex-WO3 to NO2 was in the temperature range between 150 degrees C and 250 degrees C, while the hex-WO3/MWCNTs composites were sensitive to NO2 gas at room temperature. (C) 2008 Elsevier B.V. All rights reserved.