Electrosynthesis of polypyrrole in iodide solution. Film growth, redox behaviour and potentiometric response

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Tom Lindfors, Johan Bobacka, Ari Ivaska
Publisher: ELSEVIER SCIENCE BV
Publication year: 1997
Journal: Analytica Chimica Acta
Journal acronym: ANAL CHIM ACTA
Volume number: 355
Issue number: 2-3
Start page: 217
End page: 225
Number of pages: 9
ISSN: 0003-2670
eISSN: 1873-4324


Abstract

Electrosynthesis of polypyrrole (PPy) was studied in aqueous lithium iodide solution. The electrochemical polymerization showed features of two-dimensional growth and the reaction was catalyzed by the I-2/I- couple. The potentiometric response of PPy doped with iodide (PPy(I)) was studied both in iodide solutions and solutions containing the redox couple I-2/I- with a fixed concentration ratio 0.4 but varying the initial concentration of iodide in the range 10(-5)-1.0 M. Linear, anionic response was observed in the concentration range 10(-1)-10(-3) M when only iodide species was present. However, contribution of the redox response to the overall potentiometric response increased with increasing concentration of I-2 although the concentration ration between iodine/iodide was kept constant. The influence of phosphate buffer on the electroactivity of PPy doped with iodide was also studied.


Keywords

iodide, iodine, phosphate buffer, polypyrrole, potentiometry, two-dimensional growth

Last updated on 2019-22-09 at 02:24