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

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Publikationens författare: Tom Lindfors, Johan Bobacka, Ari Ivaska
Förläggare: ELSEVIER SCIENCE BV
Publiceringsår: 1997
Tidskrift: Analytica Chimica Acta
Tidskriftsakronym: ANAL CHIM ACTA
Volym: 355
Nummer: 2-3
Artikelns första sida, sidnummer: 217
Artikelns sista sida, sidnummer: 225
Antal sidor: 9
ISSN: 0003-2670
eISSN: 1873-4324


Abstrakt

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.


Nyckelord

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

Senast uppdaterad 2019-16-12 vid 02:23