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Dopants dependent ion sensitivity of polypyrrole‐modified electrode: Case of pH sensing
Author(s) -
Pandey P. C.,
Singh G.
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27361
Subject(s) - polypyrrole , dopant , cyclic voltammetry , materials science , electrode , polyaniline , conductive polymer , scanning electron microscope , polymerization , electrochemistry , analytical chemistry (journal) , inorganic chemistry , doping , chemistry , polymer , composite material , organic chemistry , optoelectronics
The polypyrrole (PPY)‐modified electrode made through electropolymerization of pyrrole monomer is found sensitive to different cations depending on the dopants present within microstructure of polymeric domain. When p ‐toluenesulfonate (PTS) anion is doped, the modified electrode is sensitive to proton whereas, under similar conditions, in the presence of tetraphenylborate (TPB) anion, the same is sensitive to zinc ion. A comparative study on ion sensing behavior of PPY‐modified electrodes is reported in this communication. The electro‐polymerization of PTS‐doped PPY‐modified electrode, made under both potentiodynamic and potentiostatic conditions, are studied. The modified electrode is characterized by scanning electron microscopy and cyclic voltammetry and compared with those recorded for TPB‐doped PPY‐modified electrode made under similar conditions. The results based on scanning electron microscopy and cyclic voltammetry suggested; (i) dependence of microstructure based on mode of electropolymerization; (ii) dopant‐dependant ion sensitivity of PPY‐modified electrode, (iii) variation in the redox behavior of the PPY‐modified electrode based on dopants and mode of electropolymerization. Typical results on pH sensing together stability of PPY‐based pH sensor are reported and compared with those recorded for polyaniline (PANI)‐based pH sensor. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008