pH sensitivity of polyaniline and its substituted derivatives

被引：235

作者：

Lindfors, T ^{[1
]}

Ivaska, A ^{[1
]}

机构：

[1] Abo Akad Univ, Proc Chem Grp, Analyt Chem Lab, SF-20500 Turku, Finland

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2002年 / 531卷 / 01期

基金：

芬兰科学院;

关键词：

polyaniline; substituted polyanilines; electropolymerization; conducting polymer; potentiometry; UV-vis spectroscopy; pH electrode; acid anion;

D O I：

10.1016/S0022-0728(02)01005-7

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The pH sensitivity of electrically conducting polyaniline (PANI) and its derivatives poly(o-methylaniline) (PoMeANI), poly(o-ethylaniline) (PoEtANI), poly(o-propylaniline) (PoPrANI) and poly(N-methylaniline) (PNMeANI) have been studied with potentiometry and UV-vis spectroscopy. The electropolymerisation of PANI was carried out either in hydrochloric acid (HCl), methanesulphonic acid (MSA), benzenesulphonic acid (BSA) or dodecylbenzenesulphonic acid (DBSA). It is shown that the pH sensitivity of PANI and its derivatives depend on the substituent and the size of the acid anion that is used in the electropolymerisation, PANI membranes prepared in HCl show a selective and slightly super-Nernstian potentiometric pH response (62.4 +/- 0.9 mV per pH, pH 2-9), while PNMeANI, PoPrANI and PANI prepared with DBSA have a strongly suppressed pH response. The hysteresis effect observed in the UV-vis measurements for all membrane types studied restrict the use of PANI-based optical pH sensors to the pH range of only 5-8. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：43 / 52

页数：10

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