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作 者:谢英男[1] 詹自力[1] 张红芹[1] 蒋登高[1]
出 处:《电子元件与材料》2008年第3期5-8,共4页Electronic Components And Materials
基 金:河南省重点科技攻关资助项目(No.0423021700);河南省科技攻关资助项目(No.0624220059)
摘 要:以苯胺为单体,过硫酸铵为氧化剂,采用化学氧化聚合法分别在十二烷基苯磺酸(DBSA)和盐酸中合成了聚苯胺(PAn),并用傅里叶红外光谱和TGA-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。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:十二烷基苯磺酸掺杂的聚苯胺,比普通盐酸掺杂的聚苯胺对目标气体具有更好的灵敏性。当r(S:N)为0.4~0.5时,在室温下其对1000×10-6NH3的灵敏度达到了10.43,响应时间为30s,恢复时间为3min。且与盐酸相比,十二烷基苯磺酸掺杂的聚苯胺具有更好的环境稳定性。Aniline was oxidized by ammonium persulfate (APS) in dodecylbenzenesulfonic acid (DBSA) and HC1 separately for the synthesis of polyaniline. By means of FT-IR spectra and TGA-DTA, the structural changes and thermal stability of intrinsic and doped polyaniline were measured: The influences of the doped different protonic acid on the gas-sensing properties of polyaniline were also investigated. The results reveal that the gas sensors based on PAn-DBSA have better sensitivity than PAn-HC1. The sensitivity of PAn-DBSA to 1 000xl0^-6 NH3 reaches 10.43, the response time is 30 s, recovery time is 3 rain, at 20 ℃, when r(S:N) is 0.4-0.5. Long-term stability of sensitivity of acid doped polyaniline were also investigated. It can be concluded that DBSA doped polyaniline have better environmental stability.
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