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Large-Scale Hydrothermal Synthesis of Tungsten Trioxide Nanowires and Their Gas Sensing Properties

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Large scale polycrystalline nanowires of hexagonal tungsten trioxide were successfully prepared by a simple hydrothermal method. The crystal structure and morphology were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscope (HRTEM). Uniform hexagonal WO3 nanowires were obtained with diameter of about 6–15 nm and length of up to several micrometers. Thick-film gas sensors based on hexagonal WO3 nanowires were fabricated by screen-printing technology. CO and NH3 sensing properties at low concentrations (5–100 ppm) were investigated. It was found that the obtained sensing films exhibited excellent CO and NH3 gas response between 250 °C and 350 °C. Sensitivities (Ra/Rg) measured between 250 °C and 350 °C for 5–100 ppm CO and NH3 ranged from 4 to 145. Response time of the sensor was less than 5 seconds. Sensitivities increased almost linearly with increasing concentrations of CO and NH3. The reaction paths that explain the sensitivity changes to CO and NH3 were discussed in detail.
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Document Type: Research Article

Publication date: December 1, 2008

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