Tungsten Oxide Nanowires

Tungsten oxide is a surface resistance of controlled sensitive material, sensitive electronic mechanism of gas that caused the material after adsorption gas tungsten oxide crystal surface depletion layer changes, causing the change in resistance. Oxygen in the air adsorbed on the surface after the n-type oxide, tungsten, tungsten oxide by capturing the electronic guide to be formed in the oxygen-containing adsorption of negatively charged ions in the tungsten oxide surface. When the tungsten oxide NO2 contact with an oxidizing gas, NO2 gas molecules may be captured by the tungsten oxide conduction band electrons directly adsorbed on the tungsten oxide surface.

Solvothermal method utilizing a one-dimensional tungsten oxide nanowires, by incorporating an appropriate amount of single-walled carbon nanotubes (SWNT),tungsten oxide nano-composite structure -SWNT temperature sensitive components and to evaluate its sensitivity to temperature of the NO2 gas performance. By X-ray and scanning electron microscopy to characterize the microstructure of the material. Synthesis of tungsten oxide nanowire has a monoclinic structure of W₁₈O₄₉, SWNT composite material is embedded in the middle of the tungsten oxide nanowires. Gas sensing performance tests show that tungsten oxide nanowire composite structure -SWNT gas sensing components NO2 gas at room temperature showed a high sensitivity and fast response characteristics, lower incorporation of SWNT get good gas sensing performance favorable.

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