Csaba Visy - Academia.edu (original) (raw)

Uploads

Papers by Csaba Visy

Research paper thumbnail of Direct in situ conductance evidence for non-faradaic electrical processes in poly(3-methylthiophene)

Electrochimica Acta, Feb 1, 2000

ABSTRACT Registration of the conductance after the end of the electrochemical polymerisation of 3... more ABSTRACT Registration of the conductance after the end of the electrochemical polymerisation of 3-methylthiophene (PMT) indicated a large conductance increase at open circuit. Further in situ conductance measurements with the polymeric film in Bu4NPF6/acetonitrile base solution provided direct evidence for that — after the oxidation of the film — the final achievement, the accomplishment of the state of high conduction is not necessarily coupled with current flow any more. The non-faradaic step which may explain this observation is described as a chemical reorganisation within the film, which involves the transformation of solvated polymer segments to a more conjugated, non-solvated form.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Key role of the desolvation in the achievement of the quasi-metallic state of electronically conducting polymers

Electrochimica Acta, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of EQCM and in situ conductance studies on the polymerisation and redox features of thiophene co-polymers

Electrochimica Acta, Jul 1, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deprotonation and Dehydration of Pristine PPy/DS Films during Open-Circuit Relaxation: an Ignored Factor in Determining the Properties of Conducting Polymers

Journal of Physical Chemistry B, Jan 10, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characterization of polypyrrole/piperazine-1,4-bis(2-ethane sulfonate) film and its application for the immobilization of vitamin B12

Electrochimica Acta, Dec 1, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New phenomena observed during the electrochemical reduction of conducting polypyrrole films

Journal of Solid State Electrochemistry, Jun 7, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrosynthesis and comparative studies on carboxyl-functionalized polythiophene derivatives

Electrochimica Acta, Apr 1, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fixation of laccase enzyme into polypyrrole, assisted by chemical interaction with modified magnetite nanoparticles: A facile route to synthesize stable electroactive bionanocomposite catalysts

Electrochimica Acta, Mar 1, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Visible-Light-Enhanced Electrocatalytic Activity of a Polypyrrole/Magnetite Hybrid Electrode toward the Reduction of Dissolved Dioxygen

Journal of Physical Chemistry C, Oct 26, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Layer by layer growth of electroactive conducting polymer/magnetite hybrid assemblies

Synthetic Metals, May 1, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Synthesis and characterization of polypyrrole–magnetite–vitamin B12 hybrid composite electrodes

Journal of Solid State Electrochemistry, Mar 24, 2009

In this study vitamin B12 covered magnetite nanoparticles have been incorporated into a conductin... more In this study vitamin B12 covered magnetite nanoparticles have been incorporated into a conducting polypyrrole. This polymer was electrochemically synthesized in the presence of the B12-coated magnetite. The adsorption of B12 was demonstrated by the decrease in absorbance of the vitamin in the supernatant liquid after B12 has been in contact with magnetite sol overnight. The composition of the layers

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of the photoactivity of conducting polymer covered ZnO nanorod composite electrodes

Journal of Solid State Electrochemistry, Jul 27, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrochemical synthesis and characterization of poly(3-hexylthiophene)/single-walled carbon nanotube array hybrid materials

Journal of Solid State Electrochemistry, Jun 21, 2016

AbstractIn this study, we demonstrate that by directly employing single-walled carbon nanotube ar... more AbstractIn this study, we demonstrate that by directly employing single-walled carbon nanotube arrays (SWCNT-arrays)—grown on conductive substrates—as working electrodes, selective and uniform electrodeposition of a conducting polymer, namely poly(3-hexylthiophene), can be achieved on the surface of the nanotubes. The overall kinetic pattern of the electrodeposition was studied by separating the deposition charge from the one related to the redox transformation of the polymer film deposited during the precedent cycles. Both the structure and the electrochemical properties of the hybrid materials were studied as a function of the electrodeposition cycles, thus the amount of the formed polymer. The hybrids were characterized by electron microscopic (SEM, TEM) and vibrational spectroscopic (Raman spectroscopy) means. The obtained results were compared and contrasted with those gathered on macroscopic-sized multi-walled carbon nanotube array-based composites in our group recently. Overall, we conclude that electrochemical polymerization is an attractive tool to synthesize conducting polymer/SWCNT hybrid materials with controlled composition and morphology. Graphical abstractHighy organized nanostructures of conduction polymer/SWCNT array hybrids were obtained via electrodeposition

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrochemical synthesis and characterization of thiophene conducting polymer in aqueous micellar medium

Journal of Solid State Electrochemistry, Oct 16, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of simultaneous monitoring of the in situ impedance and optical changes on the redox transformation of two polythiophenes: Direct evidence for their non-identical conductance–charge carrier correlation

Electrochemistry Communications, Jul 1, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Polythiophene puzzle—a plausible solution

Journal of Electroanalytical Chemistry, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Synthesis and characterization of chemically and electrochemically prepared conducting polymer/iron oxalate composites

Electrochimica Acta, Apr 1, 2008

Poly(3-octyl-thiophene) (POT) and polypyrrole (PPy) iron oxalate composites were synthesized thro... more Poly(3-octyl-thiophene) (POT) and polypyrrole (PPy) iron oxalate composites were synthesized through a post-polymerization oxidative treatment. The composite of the latter has been prepared also by electrochemical polymerization. The samples have been characterized by X-ray diffraction (XRD), impedance spectroscopy, scanning electron microscope (SEM) combined with energy dispersive X-ray (EDX) spectroscopy, Mössbauer spectroscopy, cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). In

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrosynthesis and Simultaneously Performed In situ Impedance and UV-Vis-NIR Studies on Poly(3-Thiophene-Butyric-Acid)

Meeting abstracts, 2011

not Available.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fast redox switching into the conducting state, related to single mono-cationic/polaronic charge carriers only in cation exchanger type conducting polymers

Electrochemistry Communications, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solvation/desolvation during the redox transformation of poly(3-methylthiophene)

Journal of Solid State Electrochemistry, Apr 6, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Direct in situ conductance evidence for non-faradaic electrical processes in poly(3-methylthiophene)

Electrochimica Acta, Feb 1, 2000

ABSTRACT Registration of the conductance after the end of the electrochemical polymerisation of 3... more ABSTRACT Registration of the conductance after the end of the electrochemical polymerisation of 3-methylthiophene (PMT) indicated a large conductance increase at open circuit. Further in situ conductance measurements with the polymeric film in Bu4NPF6/acetonitrile base solution provided direct evidence for that — after the oxidation of the film — the final achievement, the accomplishment of the state of high conduction is not necessarily coupled with current flow any more. The non-faradaic step which may explain this observation is described as a chemical reorganisation within the film, which involves the transformation of solvated polymer segments to a more conjugated, non-solvated form.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Key role of the desolvation in the achievement of the quasi-metallic state of electronically conducting polymers

Electrochimica Acta, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of EQCM and in situ conductance studies on the polymerisation and redox features of thiophene co-polymers

Electrochimica Acta, Jul 1, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deprotonation and Dehydration of Pristine PPy/DS Films during Open-Circuit Relaxation: an Ignored Factor in Determining the Properties of Conducting Polymers

Journal of Physical Chemistry B, Jan 10, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characterization of polypyrrole/piperazine-1,4-bis(2-ethane sulfonate) film and its application for the immobilization of vitamin B12

Electrochimica Acta, Dec 1, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New phenomena observed during the electrochemical reduction of conducting polypyrrole films

Journal of Solid State Electrochemistry, Jun 7, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrosynthesis and comparative studies on carboxyl-functionalized polythiophene derivatives

Electrochimica Acta, Apr 1, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fixation of laccase enzyme into polypyrrole, assisted by chemical interaction with modified magnetite nanoparticles: A facile route to synthesize stable electroactive bionanocomposite catalysts

Electrochimica Acta, Mar 1, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Visible-Light-Enhanced Electrocatalytic Activity of a Polypyrrole/Magnetite Hybrid Electrode toward the Reduction of Dissolved Dioxygen

Journal of Physical Chemistry C, Oct 26, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Layer by layer growth of electroactive conducting polymer/magnetite hybrid assemblies

Synthetic Metals, May 1, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Synthesis and characterization of polypyrrole–magnetite–vitamin B12 hybrid composite electrodes

Journal of Solid State Electrochemistry, Mar 24, 2009

In this study vitamin B12 covered magnetite nanoparticles have been incorporated into a conductin... more In this study vitamin B12 covered magnetite nanoparticles have been incorporated into a conducting polypyrrole. This polymer was electrochemically synthesized in the presence of the B12-coated magnetite. The adsorption of B12 was demonstrated by the decrease in absorbance of the vitamin in the supernatant liquid after B12 has been in contact with magnetite sol overnight. The composition of the layers

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of the photoactivity of conducting polymer covered ZnO nanorod composite electrodes

Journal of Solid State Electrochemistry, Jul 27, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrochemical synthesis and characterization of poly(3-hexylthiophene)/single-walled carbon nanotube array hybrid materials

Journal of Solid State Electrochemistry, Jun 21, 2016

AbstractIn this study, we demonstrate that by directly employing single-walled carbon nanotube ar... more AbstractIn this study, we demonstrate that by directly employing single-walled carbon nanotube arrays (SWCNT-arrays)—grown on conductive substrates—as working electrodes, selective and uniform electrodeposition of a conducting polymer, namely poly(3-hexylthiophene), can be achieved on the surface of the nanotubes. The overall kinetic pattern of the electrodeposition was studied by separating the deposition charge from the one related to the redox transformation of the polymer film deposited during the precedent cycles. Both the structure and the electrochemical properties of the hybrid materials were studied as a function of the electrodeposition cycles, thus the amount of the formed polymer. The hybrids were characterized by electron microscopic (SEM, TEM) and vibrational spectroscopic (Raman spectroscopy) means. The obtained results were compared and contrasted with those gathered on macroscopic-sized multi-walled carbon nanotube array-based composites in our group recently. Overall, we conclude that electrochemical polymerization is an attractive tool to synthesize conducting polymer/SWCNT hybrid materials with controlled composition and morphology. Graphical abstractHighy organized nanostructures of conduction polymer/SWCNT array hybrids were obtained via electrodeposition

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrochemical synthesis and characterization of thiophene conducting polymer in aqueous micellar medium

Journal of Solid State Electrochemistry, Oct 16, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of simultaneous monitoring of the in situ impedance and optical changes on the redox transformation of two polythiophenes: Direct evidence for their non-identical conductance–charge carrier correlation

Electrochemistry Communications, Jul 1, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Polythiophene puzzle—a plausible solution

Journal of Electroanalytical Chemistry, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Synthesis and characterization of chemically and electrochemically prepared conducting polymer/iron oxalate composites

Electrochimica Acta, Apr 1, 2008

Poly(3-octyl-thiophene) (POT) and polypyrrole (PPy) iron oxalate composites were synthesized thro... more Poly(3-octyl-thiophene) (POT) and polypyrrole (PPy) iron oxalate composites were synthesized through a post-polymerization oxidative treatment. The composite of the latter has been prepared also by electrochemical polymerization. The samples have been characterized by X-ray diffraction (XRD), impedance spectroscopy, scanning electron microscope (SEM) combined with energy dispersive X-ray (EDX) spectroscopy, Mössbauer spectroscopy, cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). In

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrosynthesis and Simultaneously Performed In situ Impedance and UV-Vis-NIR Studies on Poly(3-Thiophene-Butyric-Acid)

Meeting abstracts, 2011

not Available.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fast redox switching into the conducting state, related to single mono-cationic/polaronic charge carriers only in cation exchanger type conducting polymers

Electrochemistry Communications, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solvation/desolvation during the redox transformation of poly(3-methylthiophene)

Journal of Solid State Electrochemistry, Apr 6, 2005

Bookmarks Related papers MentionsView impact

Log In