Novel hexagonal WO₃ nanopowder with metal decorated carbon nanotubes as NO₂ gas sensor

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• 作者：Csaba Balá ; zsi ; Katarí ; na Sedlá ; cková ; Eduard Llobet ; Radu Ionescu
• 关键词：Hexagonal WO₃ ; Carbon nanotube ; Sensing properties ; TEM
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2008
• 出版时间：28 July 2008
• 年：2008
• 卷：133
• 期：1
• 页码：151-155
• 全文大小：523 K

文摘

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 °C and 250 °C, while the hex-WO₃/MWCNTs composites were sensitive to NO₂ gas at room temperature.