Deposition of polyaniline on glass and platinum by autocatalytic oxidation of aniline with dichromate

Mažeikienė, Regina; Malinauskas, Albertas

doi:10.1016/s0379-6779(99)00172-1

Cited by 48 publications

(33 citation statements)

References 25 publications

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“…9 -11 Polyaniline and polyaniline derivatives can be synthesized both chemically and electrochemically by using suitable protonation media. [12][13][14][15] Some researchers showed that the protonation media tend rather to acidity of media in X-ray photoelectron spectroscopy (XPS) works done on polyaniline and polyaniline derivatives. 16,17 Moreover, they demonstrated that this protonation level in e Ϫ acceptor groups is lower according to aniline and alkylanilines.…”

Section: Introductionmentioning

confidence: 99%

Chemical synthesis and characterization of some conducting polyaniline derivatives: Investigation of the effect of protonation medium

Gök

Sarı

2002

J of Applied Polymer Sci

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Poly(o-toluidine) (POT) and poly(2-chloroaniline) (P2ClAn) emeraldine salts were synthesized chemically by using formic (HCOOH), acetic (CH 3 COOH), propionic (C 2 H 5 COOH), and boric (H 3 BO 3 ) acids. Ultraviolet-visible absorption spectra (UV-Vis) analysis results indicated that POT has the better protonation effects than P2ClAn. Among the POTs synthesized using the four different acids, POT(H 3 BO 3 ) showed the least protonation effect. The conductivities of prepared polymers were measured by a four-probe technique. The highest conductivities were obtained in POTs synthesized by using formic, acetic, and propionic acids. Magnetic susceptibility measurements of the polymer salts were analyzed by using Gouy scale and it was found that POT(CH 3 COOH) and POT(C 2 H 5 COOH) salts are of bipolaron structure; other polymer salts are of polaron structure. The characterization of the polymers were investigated by Fourier infrared spectroscopy (FTIR), UV-Vis, thermogravimetric analysis, and scanning electron microscopy. It was observed from UV-Vis spectra of the emeraldine salt of POT that wavelengths belonging to 3 * transitions shifted to shorter wavelengths with increasing pKa values of acids. POT and P2ClAn synthesized in four different protonation media decomposed with three-step and three-or two-step weight loss, respectively.

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Section: Introductionmentioning

confidence: 99%

Chemical synthesis and characterization of some conducting polyaniline derivatives: Investigation of the effect of protonation medium

Gök

Sarı

2002

J of Applied Polymer Sci

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“…This reaction is catalyzed by reaction products, most probably oligomers of aniline. [16] In this respect, the chemical polymerization is closely similar to electrochemical polymerization, where the thin layer of PANi electrodeposited on electrode acts as an electrocatalyst for further electropolymerization. As for the two other PANi polymerizations, the growth acceleration observed in the case of electroless deposition is believed also to be the result of an autocatalytic polymerization by the preformed PANi.…”

Section: Resultsmentioning

confidence: 99%

Electroless deposition of polyaniline: synthesis and characterization

Attout

Yunus

Bertrand

2008

Surface & Interface Analysis

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Polyaniline (PANi), as conductive polymer, constitutes an attractive material for electronic and optical applications. Different from electropolymerization and chemical oxidative polymerization, electroless deposition is another method for synthesizing PANi. Aniline can polymerize slowly and spontaneously on platinum or palladium surface in an aqueous acid solution of the monomer. This reaction proceeds via an electrochemical mechanism that involves the reduction of dissolved oxygen as cathodic and oxidation of aniline as anodic half-reactions at the metal/solution interface. PANi, obtained by electroless synthesis, was compared to chemical oxidative and electropolymerized ones by XPS and SEM. The product of electroless deposition is found to be chemically similar to the others but its morphology is different. The PANi film growth and morphology are studied as a function of time and temperature.

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“…Amine-cured epoxy systems exhibit autocatalysis because the attack on the epoxy group is catalyzed by OH, and one OH is produced for every epoxy group that reacts [29][30][31]. The synthesis of polyaniline by oxidation of aniline has been shown to be autocatalytic if performed electrochemically [32] or by the direct chemical oxidation [33,34].…”

Section: Sources Of Feedbackmentioning

confidence: 99%