pH sensitivity of polyaniline and its substituted derivatives

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Lindfors T, Ivaska A
Publication year: 2002
Journal: Journal of Electroanalytical Chemistry
Journal acronym: J ELECTROANAL CHEM
Volume number: 531
Issue number: 1
Start page: 43
End page: 52
Number of pages: 10
ISSN: 0022-0728


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.


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

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