摘要
探讨了氧化铋掺杂的SnO2纳米棒状晶粒气敏材料的制备,并测试了材料的气敏特性。氧化铋在高温形成液相,促进SnO2棒状晶粒的形成,同时氧化铋作为气敏材料的添加剂提高了对乙醇等气体的灵敏度。结果表明,采用液相沉淀法制备纳米粉体,在Bi添加量为10mol%,850℃保温2h的烧结条件下,得到的SnO2棒状晶粒直径约50nm,线径比为5,且较为均一。粉体经过稀硝酸溶液浸泡,其晶粒形貌及相结构不变,酸洗处理后的棒晶粉体制备的气敏元件,电阻值适中,对气体灵敏度提高。对乙醇、丙酮、汽油、苯和氨气的测试说明,氧化铋掺杂的SnO2棒状晶粒作为气敏材料,在不同温区对乙醇和丙酮的灵敏度较高,而且工作温度较低,对汽油、苯和氨气等气体有较好的选择性。
SnO2 nanorods doped with bismuth were prepared by Liquid-Phase Precipitation method and their gas-sensing properties studied. Samples with optimal qualities can be obtained by sintering the precipitation of Sn(OH)4 with 10 mol% bismuth oxide added. The nanorods are found to be of good uniformity and large aspect ratio (5:1). Subsequent nitrification treatment by dilute nitric acid does not alter the structure and morphology of the nanorods. The effect of bismuth on SnO2 gas sensors is twofold: the liquid phase of bismuth oxide assists the formation of rod-like particles at calcination temperatures (〉820℃), and as an additive it enhances the sensitivity of SnO2 to ethanol etc.. Experiments on various VOCs indicated that the nanorods have better sensitivity to ethanol and acetone in a wide temperature range than spherical SnO2 particles, hence lower working temperatures and better long-term stability.
出处
《传感技术学报》
CAS
CSCD
北大核心
2008年第6期920-923,共4页
Chinese Journal of Sensors and Actuators
基金
广州市科技计划项目资助(2007J1-C0341)
广州市属高校科技计划项目资助(62015)
关键词
二氧化锡
氧化铋
棒状晶粒
气敏
SnO2
nanorods
bismuth-oxide-doped
gas-sensing