Ambient Pressure Synthesis of Nanostructured Tungsten Oxide Crystalline Films
H. X. Zhang, B. Q. Yang, P. X. Feng
Journal of Nanomaterials
Abstract
We report the results of the ambient pressure synthesis of tungsten oxide nanowires and nanoparticles on AlN substrates using the hot lament CVD techniques. The morphologic surface, crystallographic structures, chemical compositions, and bond structures of the obtained samples have been investigated using scanning electron microscopy (SEM), X-ray diraction (XRD), energy dispersive X-ray spectroscopy (EDX), and Raman scattering, respectively. Dierent morphologies were observed for dierent substra...Morete temperatures, but otherwise identical growth conditions. The experimental measurements reveal the evolutions of the crystalline states and bond structures following the substrate temperatures. Besides, dierent substrate materials also aected the tungsten oxide nanostructures. Bundles of wire-type tungsten oxide nanowires with a length of up to 5 mm were obtained on Al2O3 substrate. Furthermore, the sensitive properties of the super long nanowires to the gas and dierent temperature were investigated. The dependence of the sensitivity of tungsten oxide nanowires to the methane as a function of the time was obtained. The sensitive properties of the tungsten oxide nanowires have almost linear relationship with the temperature.
keywords:EDX; hot filament; sensitive properties; Ambient Pressure; Nanostructured Tungsten Oxide; tungsten oxide nanowires; different substrate
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