A new route to synthesize high degree polythiophene in a room temperature melt medium

Conducting polymers suffer from folds and kinks because of random nucleation and solvation of a free radical cation to yield a cross linked/disordered polymer and therefore a solvent free electrochemical polymerization in a room temperature melt medium is adopted to yield a high degree polymer with...

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Bibliographic Details
Published inSynthetic metals Vol. 155; no. 1; pp. 232 - 239
Main Authors Geetha, S., Trivedi, D.C.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.10.2005
Amsterdam Elsevier Science
New York, NY
Subjects
Applied sciences
Conductivity
Electrosynthesis
Exact sciences and technology
Physicochemistry of polymers
Polymerization
Polymers and radiations
Polythiophene
Room temperature melt
Conductivity
Electrosynthesis
Room temperature melt
Polythiophene
Electrical conductivity
Electrical properties
Iminium compounds
Molten electrolyte
Experimental study
Electrochemical polymerization
Thermal stability
Ionic liquid
Conducting polymers
Morphology
Preparation
Reaction mechanism
Aluminium chloride
Thiophene polymer
Room temperature
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Summary:Conducting polymers suffer from folds and kinks because of random nucleation and solvation of a free radical cation to yield a cross linked/disordered polymer and therefore a solvent free electrochemical polymerization in a room temperature melt medium is adopted to yield a high degree polymer with high electronic conductivity. Electropolymerization of thiophene was performed on platinum/ITO substrates using cyclic voltametry or galvenostatic mode in chloroaluminate room temperature melt medium to obtain a reddish brown free standing film which can be peeled off from the electrode surface after a minimum of 10 cycles. The conductivity was found to be around 10 2 S/cm. The degree of polymerization was calculated to be around 44 from IR studies. A layered structure supportive for high degree of polymerization was witnessed from potential step technique. From UV spectra the charge carriers were found to be bipolarons. The morphology of the film was found to be crystalline from SEM and XRD studies. Capacitative impedance properties for doped samples were interpreted from impedance spectroscopy.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2005.08.003