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采用化学氧化聚合法合成了不同有机磺酸掺杂的聚苯胺(PAn),采用傅里叶红外光谱和TG-DTA技术对PAn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PAn气敏性能的影响。结果表明,有机磺酸掺杂的PAn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1000ppm(10-6)NH3的灵敏度达到了15.47,而且响应恢复时间短。测试了不同酸掺杂PAn灵敏度的长期稳定性,结合TG-DTA的分析结果表明,与PAn-HCl相比,有机磺酸掺杂的PAn具有更好的环境稳定性。
Polyaniline doped with different organic sulfonic acids (PAn) was synthesized by chemical oxidation polymerization. The structure and thermal stability of PAn before and after doping were investigated by Fourier transform infrared spectroscopy and TG-DTA. The effects of different proton doping on the gas sensing properties of PAn were investigated. The results show that organic sulfonic acid-doped PAn has better sensitivity to target gas than PAn-HCl, and the best PAn-SSA achieves a sensitivity of 15.47 to 1000ppm (10-6) NH3 at room temperature, and Response recovery time is short. The long-term stability of PAn sensitivities with different acid doping was tested. The results of TG-DTA analysis showed that organic sulfonic acid-doped PAn has better environmental stability than PAn-HCl.