有机磺酸掺杂聚苯胺的气敏性能  

Gas-Sensing Properties of Organic Sulfonic Acid Doped Polyaniline

作　　者：谢英男[1,2] 詹自力[1] 张红芹[1] 蒋登高[1] 

机构地区：[1]郑州大学化工学院,河南郑州450002 [2]南阳理工学院,河南南阳473004

出　　处：《高校化学工程学报》2009年第1期154-159,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：河南省重点科技攻关项目(0423021700);河南省科技攻关项目(0624220059)

摘　　要：采用化学氧化聚合法,以苯胺为单体,过硫酸铵为氧化剂,在不同的酸性介质中合成了聚苯胺(PAn),采用傅里叶红外光谱和TG-DTA技术对聚苯胺掺杂前后的结构变化和热稳定性进行了分析,结果表明,掺杂剂的加入降低了聚苯胺分子链的分解温度,与HCl掺杂相比,有机磺酸掺杂的聚苯胺具有更好的热稳定性。研究了不同质子酸掺杂对聚苯胺气敏性能的影响,结果表明有机磺酸掺杂的聚苯胺比PAn-HCl对目标气体具有更好的灵敏性,其中结果最好的PAn-SSA在室温下对1000×10-6NH3的灵敏度达到了15.47,而且响应时间小于20s,恢复时间小于2min,响应恢复性能良好。测试了不同酸掺杂聚苯胺灵敏度的长期稳定性,结合TG-DTA的分析结果,说明与PAn-HCl相比,有机磺酸掺杂的聚苯胺具有更好的环境稳定性。Through oxy-polymerization method, the polyaniline （PAn） was synthesized in acidic aqueous solution by using aniline as monomer and ammonium persulfate （APS） as oxidizer. With the help of FT-IR spectra and TG-DTA, the structural changes and the thermal stability of the polyanilines before and after doping were studied respectively. The results show that the dopants reduce the molecule chain decompose temperature of PAn, and the organic sulfonic acid doped PAn has better thermal stability than that of HCI doped PAn. The influence of the doped acid on the NH3 sensitivity of polyaniline was also investigated; the results reveal that the gas sensors based on organic sulfonic acid doped polyanilines have better gas sensitivity than that based on PAn-HCI; especially the sensitivity of PAn-SSA （PAn doped with 5-sulphosalicylic acid） to 1000×10^-6 NH3 reaches 15.47, and its response time is less than 20 s, recovery time is less than 2 min. The tong-term NH3 sensitivity of acid doped polyanilines were also investigated; combining with the analysis result of TG-DTA, it can be concluded that the organic acid doped polyanilines have better environmental stability than that of PAn-HC1.

关 键 词：聚苯胺 有机磺酸 掺杂 气敏特性 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] O633[自动化与计算机技术—控制科学与工程]