Research in the field of conducting organic polymers is currently attracting increasing attention, since these innovative smart materials are very promising for applications in different fields, from energetics to electronics and sensoristics. We have devoted special interest to the study of thiophene-based materials, paying attention, in particular, to the relationships between chemical structure and electronic properties [1,2]. Relevant results in this field can be successfully achieved with a systematic characterization of the materials through a combination of voltammetric and electrochemical impedance spectroscopy (EIS) techniques. EIS, in particular, is fundamental for clarifying the conductive behaviour, both electronic and ionic, of films of electroactive materials. In this frame, we are developing a systematic investigation of the role played by different experimental parameters on the charge transport mechanism in polythiophene-based systems, using the cyclopentadithiophene (CPDT) as the model monomer. There are two main reasons for this choice: CPDT molecule is planar and electronic conjugation is, by consequence, higher than that displayed by analogous compounds based on 2,2’-bithiophene. Furthermore, the C2v symmetry makes homotopic the two thiophene alpha-positions in CPDT, in the olygomers and in the polymers, thus assuring a full regioregularity to the materials resulting from the electroxidation process. The results of the EIS investigation on poly-CPDT will be presented, focusing attention in particular onto the effects of an increasing thickness of the film, of the different applied potentials, and of the addition of redox mediators (ferrocene and decamethylferrocene) to the working medium. References: [1] T. Benincori, M. Capaccio, F. De Angelis, L. Falciola, M. Muccini, P.Mussini, A. Ponti, S.Toffanin, P. Traldi, F. Sannicolò. Chem. Eur. J. 2008,14, 459-471 [2] T.Benincori, V. Bonometti, F. De Angelis, L. Falciola, M. Muccini, P. R. Mussini, T. Pilati, G. Rampinini, S. Rizzo, S. Toffanin, F. Sannicolò, Chem. Eur. J. 2010, 16 (30), 9086-9098

4H-cyclopenta[3,2-b]dithiophene (CPDT): a useful model for the study of conducting polymers via electrochemical impedance spectroscopy / F. Sannicolò, P.R. Mussini, M. Magni. ((Intervento presentato al 8. convegno ECHEMS meeting: Electrochemistry in Molecular Surface Science and Catalysis tenutosi a Bertinoro nel 2012.

4H-cyclopenta[3,2-b]dithiophene (CPDT): a useful model for the study of conducting polymers via electrochemical impedance spectroscopy

F. Sannicolò;P.R. Mussini;M. Magni
2012

Abstract

Research in the field of conducting organic polymers is currently attracting increasing attention, since these innovative smart materials are very promising for applications in different fields, from energetics to electronics and sensoristics. We have devoted special interest to the study of thiophene-based materials, paying attention, in particular, to the relationships between chemical structure and electronic properties [1,2]. Relevant results in this field can be successfully achieved with a systematic characterization of the materials through a combination of voltammetric and electrochemical impedance spectroscopy (EIS) techniques. EIS, in particular, is fundamental for clarifying the conductive behaviour, both electronic and ionic, of films of electroactive materials. In this frame, we are developing a systematic investigation of the role played by different experimental parameters on the charge transport mechanism in polythiophene-based systems, using the cyclopentadithiophene (CPDT) as the model monomer. There are two main reasons for this choice: CPDT molecule is planar and electronic conjugation is, by consequence, higher than that displayed by analogous compounds based on 2,2’-bithiophene. Furthermore, the C2v symmetry makes homotopic the two thiophene alpha-positions in CPDT, in the olygomers and in the polymers, thus assuring a full regioregularity to the materials resulting from the electroxidation process. The results of the EIS investigation on poly-CPDT will be presented, focusing attention in particular onto the effects of an increasing thickness of the film, of the different applied potentials, and of the addition of redox mediators (ferrocene and decamethylferrocene) to the working medium. References: [1] T. Benincori, M. Capaccio, F. De Angelis, L. Falciola, M. Muccini, P.Mussini, A. Ponti, S.Toffanin, P. Traldi, F. Sannicolò. Chem. Eur. J. 2008,14, 459-471 [2] T.Benincori, V. Bonometti, F. De Angelis, L. Falciola, M. Muccini, P. R. Mussini, T. Pilati, G. Rampinini, S. Rizzo, S. Toffanin, F. Sannicolò, Chem. Eur. J. 2010, 16 (30), 9086-9098
giu-2012
Electrochemical Impedance Spectroscopy (EIS) ; conducting organic polymers
Settore CHIM/02 - Chimica Fisica
Settore CHIM/06 - Chimica Organica
Settore CHIM/01 - Chimica Analitica
International Society of Electrochemistry
Electrochemical Society
Società Chimica Italiana
4H-cyclopenta[3,2-b]dithiophene (CPDT): a useful model for the study of conducting polymers via electrochemical impedance spectroscopy / F. Sannicolò, P.R. Mussini, M. Magni. ((Intervento presentato al 8. convegno ECHEMS meeting: Electrochemistry in Molecular Surface Science and Catalysis tenutosi a Bertinoro nel 2012.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/226550
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