Matrix rank analysis of spectral studies on the electropolymerisation and discharge process of conducting polypyrrole/dodecyl sulfate films

Emese Kriván, G. Peintler, C. Visy

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11 Citations (Scopus)

Abstract

The polymerisation of pyrrole in aqueous sodium dodecyl sulfate (SDS) solution was studied systematically by in situ spectroelectrochemical technique including the optical changes during the reduction of the freshly prepared film. In order to determine the number of species formed during the anodic oxidation, the spectra registered during the deposition and the electrochemical reduction were evaluated by matrix rank analysis (MRA). This treatment of the data led to the conclusion that the spectral changes can be interpreted only by assuming five independent absorbing species, which could be uniformly detected during both the regular and irregular reduction reported in our recent work. The results were completed by a study on the pH and SDS concentration dependence of the solution phase oligomerisation during the chemical 'aging' of the monomer solution, which leads to a product absorbing also in the visible range. On the basis of the observations, the two extra species found beyond the neutral, monocationic and dicationic species were identified as a protonated neutral segment and its oxidized form.

Original languageEnglish
Pages (from-to)1529-1535
Number of pages7
JournalElectrochimica Acta
Volume50
Issue number7-8
DOIs
Publication statusPublished - Feb 15 2005

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Electropolymerization
Polypyrroles
Sodium dodecyl sulfate
Sodium Dodecyl Sulfate
Oligomerization
Pyrroles
Anodic oxidation
Aging of materials
Monomers
Polymerization
Sulfates
polypyrrole
dodecyl sulfate

Keywords

  • Electropolymerisation
  • Matrix rank analysis
  • Protonation
  • Pyrrole
  • UV-vis spectroelectrochemistry

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

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abstract = "The polymerisation of pyrrole in aqueous sodium dodecyl sulfate (SDS) solution was studied systematically by in situ spectroelectrochemical technique including the optical changes during the reduction of the freshly prepared film. In order to determine the number of species formed during the anodic oxidation, the spectra registered during the deposition and the electrochemical reduction were evaluated by matrix rank analysis (MRA). This treatment of the data led to the conclusion that the spectral changes can be interpreted only by assuming five independent absorbing species, which could be uniformly detected during both the regular and irregular reduction reported in our recent work. The results were completed by a study on the pH and SDS concentration dependence of the solution phase oligomerisation during the chemical 'aging' of the monomer solution, which leads to a product absorbing also in the visible range. On the basis of the observations, the two extra species found beyond the neutral, monocationic and dicationic species were identified as a protonated neutral segment and its oxidized form.",
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T1 - Matrix rank analysis of spectral studies on the electropolymerisation and discharge process of conducting polypyrrole/dodecyl sulfate films

AU - Kriván, Emese

AU - Peintler, G.

AU - Visy, C.

PY - 2005/2/15

Y1 - 2005/2/15

N2 - The polymerisation of pyrrole in aqueous sodium dodecyl sulfate (SDS) solution was studied systematically by in situ spectroelectrochemical technique including the optical changes during the reduction of the freshly prepared film. In order to determine the number of species formed during the anodic oxidation, the spectra registered during the deposition and the electrochemical reduction were evaluated by matrix rank analysis (MRA). This treatment of the data led to the conclusion that the spectral changes can be interpreted only by assuming five independent absorbing species, which could be uniformly detected during both the regular and irregular reduction reported in our recent work. The results were completed by a study on the pH and SDS concentration dependence of the solution phase oligomerisation during the chemical 'aging' of the monomer solution, which leads to a product absorbing also in the visible range. On the basis of the observations, the two extra species found beyond the neutral, monocationic and dicationic species were identified as a protonated neutral segment and its oxidized form.

AB - The polymerisation of pyrrole in aqueous sodium dodecyl sulfate (SDS) solution was studied systematically by in situ spectroelectrochemical technique including the optical changes during the reduction of the freshly prepared film. In order to determine the number of species formed during the anodic oxidation, the spectra registered during the deposition and the electrochemical reduction were evaluated by matrix rank analysis (MRA). This treatment of the data led to the conclusion that the spectral changes can be interpreted only by assuming five independent absorbing species, which could be uniformly detected during both the regular and irregular reduction reported in our recent work. The results were completed by a study on the pH and SDS concentration dependence of the solution phase oligomerisation during the chemical 'aging' of the monomer solution, which leads to a product absorbing also in the visible range. On the basis of the observations, the two extra species found beyond the neutral, monocationic and dicationic species were identified as a protonated neutral segment and its oxidized form.

KW - Electropolymerisation

KW - Matrix rank analysis

KW - Protonation

KW - Pyrrole

KW - UV-vis spectroelectrochemistry

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JO - Electrochimica Acta

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