聚吡咯/SnO_2复合材料气敏性能研究  

Study on gas sensitive performance of polypyrrole/SnO_2 composite materials

作　　者：范红青[1] 周建萍[1] 刘志雷[1] 

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《化工新型材料》2012年第5期139-141,共3页New Chemical Materials

基　　金：江西省教育厅青年基金项目(GJJ10723)

摘　　要：采用化学氧化聚合法合成了聚吡咯(PPy),并通过机械共混法制备了PPy/SnO2/PVA复合薄膜材料,研究其在室温下对乙醇和丙酮气体的敏感性。结果表明:PPy/SnO2/PVA材料随着SnO2的增加表现出较好的选择性,响应和恢复时间缩短,灵敏度下降。当SnO2为40%时,PPy/SnO2/PVA对乙醇气体响应时间比PPy/PVA缩短了65%,恢复时间缩短了68%,而灵敏度下降了39%,材料的稳定性得到提高。PPy/SnO2/PVA复合材料在乙醇和丙酮气体中显示出不同的气敏性和响应恢复时间,但灵敏度相差不大。膜厚易导致材料灵敏度降低和响应、恢复时间变长。此外,该类气敏复合材料具有良好的重复性、稳定性。Polypyrrole（ppy） was synthesized by chemical oxidation polymerization, then PPy/SnO2/PVA composite thin films were prepared by mechanical mixing. The sensitivities of films to gases of ethanol and acetone at room tempera- ture were studied. The results showed that with the increase of SnO2, the composite showed good selectivity and response- recover time was very shot and recovery time was reduced. When the amount of SnO2 was 40%, the time of PPy/SnO2 / PVA composite responses to ethanol than PPy/PVA reduced by 65 %, recovery time reduced by 68 %, sensitivity decreased by 39%, and stability of materials was significantly improved. In the same concentration, the composite showed a different gas sensitivity and recovery time in two gases. But the difference in sensitivity was not significant. The composite showed good repeated acts. The sensitivity was decreased and the response-recovery time got longer when the film became thicker.

关 键 词：聚吡咯 SNO2 PVA 导电复合材料 气敏性 

分 类 号：TB381[一般工业技术—材料科学与工程]