Potentiometric and UV-vis characterisation of N-substituted polyanilines

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Lindfors T, Ivaska A
Publisher: ELSEVIER SCIENCE SA
Publication year: 2002
Journal: Journal of Electroanalytical Chemistry
Journal acronym: J ELECTROANAL CHEM
Volume number: 535
Issue number: 1-2
Start page: 65
End page: 74
Number of pages: 10
ISSN: 0022-0728


Abstract

Poly(N-methylaniline) (PNMeANI), poly(N-ethylaniline) (PNEtANI), poly(N-propylaniline) (PNPrANI) and poly(N-butylani-line) (PNBuANI) films were polymerised on glassy carbon and tin oxide (TO) substrates in 1.0 M HClO4. The pH sensitivity of the polymer films was investigated with potentiometry and UV-vis measurements in aqueous buffer solutions with pH 2-9. The results of these measurements were compared with polyaniline (PANI) prepared in 1.0 M HCl In this study, the potential and the UV-vis spectrum of the different polymer films deposited on TO were measured simultaneously. These optopotentiometric measurements give information about the surface and bulk processes in the N-substituted polyaniline films when they are in contact with the buffer solutions of different pH. It was shown that the N-substituted polyaniline films were not pH sensitive. The suppressed potentiometric pH sensitivity of the N-substituted polyanilines, which were observed when changing pH, are caused by reduction of the polymer films from their emeraldine to leucoemeraldine oxidation state. Polymerisation of PNMeANI in 0.1 M dodecylbenzenesulphonic acid (DBSA) solution is also reported in this paper. (C) 2002 Elsevier Science B.V. All rights reserved.


Keywords

conducting polymer, DBSA, electropolymerisation, N-substituted polyanilines, pH sensitivity, potentiometry, UV-vis spectroscopy

Last updated on 2019-18-09 at 05:48