【摘要】 通过热分解法，可制备出平均晶粒尺寸＜100 nm的WO3材料，在此材料中掺入适 量的用溶胶-凝胶法制备的SiO2可制得对NH3有较好灵敏度的气敏元件.该元件选择性 好，响应时间短，可作为理想的氨敏元件.更多还原

【Abstract】 The nanosized material of WO3 are prepared by thermat decomposition ,its avera ge grain size is smaller than 100 nm. WO３ gas sensing materials doped with Si O２ has high gas sensitivity to NH３, the SiO２ powder is made by sol-gel method. It is shown that the sensor can be used as NＨ３ gas sensor, and i t has good gas selectivity and short response time.更多还原