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

被引：82

作者：

Balazsi, Csaba ^{[1
]}

Sedlackova, Katarina ^{[1
]}

Llobet, Eduard ^{[2
]}

Ionescu, Radu ^{[2
]}

机构：

[1] Hungarian Acad Sci, Res Inst Tech Phys & Mat Sci, H-1121 Budapest, Hungary

[2] Univ Rovira & Virgili, Dept Elect Engn, MINOS, Tarragona 43007, Spain

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2008年 / 133卷 / 01期

关键词：

hexagonal WO3; carbon nanotube; sensing properties; TEM;

D O I：

10.1016/j.snb.2008.02.006

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：151 / 155

页数：5

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