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首页> 外文会议>Symposium Proceedings vol.915; Symposium on Nanostructured Materials and Hybrid Composites for Gas Sensors and Biomedical Applications; 20060418-20; San Francisco,CA(US) >Synthesis, Characterisation of WO_3 Nanofibers and their Application in Chemical Gas Sensing
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Synthesis, Characterisation of WO_3 Nanofibers and their Application in Chemical Gas Sensing

机译：WO_3纳米纤维的合成，表征及其在化学气体传感中的应用

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摘要

WO_3 nanofibers have been produced by a simple method as electrospinnig. This is a process by which polymer nanofibers (with submicron scale diameters) can be formed when a droplet of viscoelastic polymer solution is subjected to high voltage electrostatic field. Polymer PMMA and WCl_6 solution mixtures were used as precursors. The nanofiber were characterized morphologically and chemically by XPS, SEM, and XRD measurements and it was found the formation of mixed WO_x/PMMA nanowires at room temperature that evolve after annealing at 300℃ towards pure WO_3 nanofibers as evidenced by XPS measurements. After the characterization the nanofibers have been deposited on the sensor devices to check their gas sensing properties. They show a semiconductor-like behaviour when they are heated and wide variation of the electrical resistance when they are exposure to NO_2 gas.
机译：WO_3纳米纤维已经通过简单的方法如静电纺丝法生产。这是当粘弹性聚合物溶液的液滴经受高压静电场时，可以形成聚合物纳米纤维（具有亚微米级直径）的过程。聚合物PMMA和WCl-6溶液混合物用作前体。通过XPS，SEM和XRD测量对纳米纤维进行了形态和化学表征，发现在室温下混合WO_x / PMMA纳米线的形成在300℃退火后逐渐演变为纯WO_3纳米纤维，这由XPS测量证明。在表征之后，纳米纤维已经沉积在传感器装置上以检查其气体感测特性。它们在加热时表现出类似半导体的行为，而在暴露于NO_2气体时则表现出很大的电阻变化。

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