纳米SnO_2微粉的制备与性能

Preparation and Properties of Nanometer-Sized SnO_2 Powder

纳米ＳｎＯ_２微粉的制备与性能刘杏芹，陶善文，沈瑜生（中国科学技术大学材料科学与工程系合肥２３００２６）关键词纳米微粉，二氧化锡，溶胶－凝胶法，气敏性能ＳｎＯ２作为一种功能基体材料，在气敏、湿敏、光学技术等方面已有广泛的应用，而ＳｎＯ２微粉或超微粉的?..

Ultra-fine SnO_2 powder with mean size of 2～3 nm was prepared by a sol-gel process.The structure and properties of the powder were studied.It is found that the tetragonal tin dioxide formed essentially during the gel drying at 70℃,and further crystallized on heating at 240～330℃,which was much lower than the temperature reported for the powder prepared with other method.The temperature dependent curue of conductivity for the thick film gas sensors made of this ultrafine powders showed a peak at 130℃,which was obviously lower than that reported in literature.The gas sensing layer of the element exhibited good strength and good resistivity stability as well as high sensitivity to H_2 and C_2H_2 gases.