摘要
采用溶胶－凝胶法制备了α－Ｆｅ２Ｏ３－Ａｌ２Ｏ３－Ｎａ２Ｏ复合超微粉，对微粉及其烧结后的物相及粒度进行了分析。湿敏特性测试结果表明：纳米级α－Ｆｅ２Ｏ３－Ａｌ２Ｏ３－Ｎａ２Ｏ陶瓷元件的感湿灵敏度高于简单氧化物机械混合后制成的α－Ｆｅ２Ｏ３－Ａｌ２Ｏ３－Ｎａ２Ｏ陶瓷元件，并具有较快的响应特性及较好的稳定性。
Ultrafine powders of nanometer sized α Fe 2O 3 Al 2O 3 Na 2O were prepared by Sol gol method. and the phase composition and grain size were studied. The experiment results showed that the sensitivity of humidity sensor made of nanometer sized α Fe 2O 3 Al 2O 3 Na 2O ceramic is higher than that of common α Fe 2O 3 Al 2O 3 Na 2O ceramic. A typicalresistance of the sensor changes from 10 7 to 10 3 for 11%￣95% relative humidity. The response characteristics and the stability of the sensor are good.
基金
国家自然科学基金
关键词
纳米级
湿敏材料
氧化铁
氧化铝
氧化钠
陶瓷
nanometer
α Fe 2O 3
sol gol
humidity sesitivity
relative humidity
