Electrical conductivity response of poly(p-phenylene)/ZSM-5 composite

2007 7th IEEE Conference on Nanotechnology (IEEE NANO) Pub Date : 2007-08-01 DOI:10.1109/NANO.2007.4601372

P. Phumman, A. Sirivat

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Abstract

Poly(p-phenylene) (PPP) was chemically synthesized via the oxidative polymerization of benzene and doped with FeCl₃. Electrical conductivity response of doped PPP (dPPP) towards CO, H₂ and NH₃ was investigated. dPPP shows no response towards CO and H₂, but it shows a definite negative response to NH₃. The electrical conductivity sensitivity of dPPP increases with increasing NH₃ concentration. In order to improve sensitivity of the sensor, ZSM-5 zeolite is added into the conductive polymer matrix. The sensitivity of the sensor increases with increasing zeolite content up to 30%. Moreover, the effect of cation type residing in the zeolite pore is investigated: including Na⁺, K⁺, NH₄ ⁺ and H⁺. The electrical conductivity sensitivity of the composites with different cations in the zeolite can be arranged in this order; 50:1 dPPP(90)/KZ23 <50:1 dPPP<50:1 dPPP(90)/NaZ23<50:1 dPPP(90)/NH₄Z23<50:1 dPPP(90)/HZ23. The variation in sensitivity with cation type can be described in term of the acid-base interaction. The 50:1 dPPP(90)/HZ23 possesses the highest sensitivity of -0.36 since H⁺ has the highest acidity which induces more favorable NH₃ adsorption and interaction with the conductive polymer.

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聚(对苯)/ZSM-5复合材料的电导率响应

以苯为原料，以FeCl3为掺杂物，通过氧化聚合合成了聚对苯(PPP)。研究了掺杂PPP (dPPP)对CO、H2和NH3的电导率响应。dPPP对CO和H2没有响应，但对NH3有明显的负响应。dPPP的电导率随NH3浓度的增加而增加。为了提高传感器的灵敏度，在导电聚合物基体中加入ZSM-5沸石。传感器的灵敏度随沸石含量的增加而增加，最高可达30%。此外，还研究了Na+、K+、NH4 +和H+等阳离子类型对沸石孔洞的影响。沸石中不同阳离子的复合材料的电导率灵敏度可按此顺序排列;50:1 dPPP(90)/KZ23 4Z23+具有最高的酸度，诱导更有利的NH3吸附和与导电聚合物的相互作用。

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2007 7th IEEE Conference on Nanotechnology (IEEE NANO)

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