Anodic release of anions from polypyrrole

An XPS and AFM study of polypyrrole coating on mild steel

“…Carbonyl groups may exist either at b-or a-carbons ; the latter case leads either to the termination of the polymer chain or to the structural changes (a-C to b-C coupling of the monomers instead of the classical a-C to a-C) and, hence, to threedimensional growth. Overoxidation might be one reason for the good adhesion of the thin Ðlm, because Beck et al 43 suggest that overoxidation may enhance adhesion due to the increased polarity of the polymer chain. Furthermore, the selectivity and sensitivity of Ppy can be changed through electrochemical overoxidation of the polymer.…”

Voltammetric behavior and determination of isoniazid in pharmaceuticals by using overoxidized polypyrrole glassy carbon modified electrode

“…Indeed, the FT-IR spectra of the colloidal particles prepared at different pH levels demonstrated increasing intensity of a carbonyl stretching vibration at 1670 cm À1 with an increase in the pH on polymerization. It has further been shown that small doping anions can be ejected from OPPy, this is caused a porous structure could be formed on the electrode [17]. OPPy, has aroused special interest in the last few years as a means of constructing protective coatings in order to improve selectivity; in fact, cation permselective behavior and the efficiency of OPPy in suppressing interfering electroactive species and avoiding electrode fouling make this type of polymer particularly suitable for determinations in biological media [16].…”

Two reduction processes of conducting polypyrrole tosylate film in aqueous solutions

“…The electrochemical properties of conducting polymers have attracted much attention in the past 20 years, [1][2][3][4][5][6][7] due to the novel doping/dedoping mechanism of its electrochemical processes and its promising electrochemical applications, such as in batteries, electrochromic displays, electrocatalysis, and electrochemical sensors. Among the conducting polymers, conducting polypyrrole (PPy) film has drawn special interest in electrochemical studies 1,3-9 because of its high conductivity, high stability in air, and the easy preparation of PPy films by electropolymerization.…”