pH sensitivity of polyaniline and its substituted derivatives

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Lindfors T, Ivaska A
Förläggare: ELSEVIER SCIENCE SA
Publiceringsår: 2002
Tidskrift: Journal of Electroanalytical Chemistry
Tidskriftsakronym: J ELECTROANAL CHEM
Volym: 531
Nummer: 1
Artikelns första sida, sidnummer: 43
Artikelns sista sida, sidnummer: 52
Antal sidor: 10
ISSN: 0022-0728


Abstrakt

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.


Nyckelord

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

Senast uppdaterad 2019-14-12 vid 04:42