Etude du Polythiophene Par Spectrometrie Raman

Lère‐Porte, Jean‐Pierre; Sauvajol, Jean‐Louis; Hasoon, Salah Abdulla; Chenouni, D.; Caltier, M.; Pétrissans, J.

doi:10.1080/00268948808070250

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…4,5 The doping levels of CP films depend strongly on the experimental conditions such as applied potential, electrolyte, supporting salt, and monomer structure. 6,7 The color and morphology of the CP film are known to change during the film growth process. [8][9][10][11][12] However, little work has concerned the thickness dependence of the doping level of electrochemically deposited CP films.…”

Section: Introductionmentioning

confidence: 99%

“…Electrochemical polymerization is an useful and widely applied technique for synthesizing conducting polymer (CP) films. − The CP films prepared by this technique are usually formed in an oxidized (doped) state and used without further treatment. , The doping levels of CP films depend strongly on the experimental conditions such as applied potential, electrolyte, supporting salt, and monomer structure. , The color and morphology of the CP film are known to change during the film growth process. − However, little work has concerned the thickness dependence of the doping level of electrochemically deposited CP films. Recently, we found that the CP films such as polypyrrole, poly( para -phenylene) and polythiophenes (PTs) were formed almost in a neutral state initially and then the doping levels increased gradually to constant values.…”

Section: Introductionmentioning

confidence: 99%

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Raman Spectroscopic and Electrochemical Studies on the Doping Level Changes of Polythiophene Films during Their Electrochemical Growth Processes

Shi

2001

J. Phys. Chem. B

115

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Polythiophene (PT), poly(3-chlorothiophene) (PCT), and poly(3-methylthiophene) (PMeT) have been electrochemically deposited on mirrorlike stainless steel (SS) electrode surfaces by direct oxidative polymerization of corresponding monomers in boron trifluoride diethyl etherate (BFEE) solution. The doping levels of as-grown thin films have been determined electrochemically. The results demonstrated that PTs were formed nearly in neutral state initially and their doping levels increased during electrochemical growth processes. Monomer structure and electrolyte have strong effects on the doping levels of PTs with a given thickness. Raman spectroscopic studies also confirmed these findings. Furthermore, it is found that the oxidized species of polythiophene and poly(3-chlorothiophene) are mainly presented in radical cations, while dications are favored to be formed in poly(3-methylthiophene) with a doping level higher than ca. 5%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopic and Electrochemical Studies on the Doping Level Changes of Polythiophene Films during Their Electrochemical Growth Processes

Shi

2001

J. Phys. Chem. B

115

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“…[1][2][3] The CP films prepared by this technique are usually formed in an oxidized (doped) state, 4,5 and the doping levels of the as-grown CP films depend strongly on the experimental conditions such as the value of applied potential, solvent and supporting salt. 6,7 The color and morphology of the CP film are known to depend on film thickness. [8][9][10][11][12] However, as far as we know, no work concerning the doping level change of conducting polymer during its electrochemical growth process has been reported.…”

Section: Introductionmentioning

confidence: 99%

Doping level change of polythiophene film during its electrochemical growth process

Shi

Chen

et al. 2002

Phys. Chem. Chem. Phys.

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Polythiophene (Pth) films have been electrochemically deposited on mirror-like stainless steel (SS) (or gold) electrode surfaces by direct oxidation of thiophene in boron trifluoride diethyl etherate (BFEE) solutions at a constant applied potential of 1.3 V (vs. Ag/AgCl). The Raman spectra of Pth films have been investigated by excitation with a 514, 633 or 785 nm laser beam. The 633 nm laser beam was found to be the best among the three excitation lights tried for studying the doping level change of Pth film. The overall features of 633 nm excited resonance Raman spectra of as-grown Pth films depend strongly on film thickness. Raman and X-ray photoelectron energy spectroscopic (XPS) results and electrochemical studies demonstrated that the doping level of the Pth film increased with the increase of film thickness. Furthermore, successive cyclic voltammetric scanning was found to be a more effective approach than applying a constant positive potential for doping a thin compact conducting polymer film.

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“…These bands have been used in previous studies to evaluate the quality of the polymer. 21,22,24 In the 700 cm 1 spectral region, four bands are observed; two normal modes 6 and 7 , assigned to in-plane ring deformations, and two defect modes D 4 and D 5 (see Fig. 1).…”

Section: Sers On Ag and Cu Massive Electrodes Ex Situ Sers Analysesmentioning

confidence: 99%

Ex situ and in situ SERS analyses of polybithiophene using roughened Ag and Cu electrodes and multilayer SERS‐active systems

Bazzaoui¹,

Aubard

Félidj

et al. 2005

J Raman Spectroscopy

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Electrochemical deposition of polybithiophene (PbT) films on suitably roughened silver and copper electrodes enabled us to record surface-enhanced Raman scattering (SERS) spectra of oxidized and reduced species showing the important changes in the spectral features of the different oxidation states of the polymer film. The comparison between SERS spectra and Raman spectra of PbT electrosynthesized on platinum allowed the identification of vibrational modes which are the most sensitive to the surface enhancement effect. The orientation and the anchorage mode of the polymer rings, during the first stages of electropolymerization, were estimated according to the SERS selection rules. In situ SERS analyses revealed that the spectral changes observed during the doping process are due to a transition from aromatic to quinoid structure and to an increase in structural defects along the polymer chain. Ex situ and in situ SERS studies were also carried out using various multilayer SERS-active systems in which the polymer is either electrodeposited on a thin layer of a SERS-active metal coating an iron electrode or sandwiched between the thin SERS-active layer and the iron support.

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Etude du Polythiophene Par Spectrometrie Raman

Cited by 5 publications

References 6 publications

Raman Spectroscopic and Electrochemical Studies on the Doping Level Changes of Polythiophene Films during Their Electrochemical Growth Processes

Raman Spectroscopic and Electrochemical Studies on the Doping Level Changes of Polythiophene Films during Their Electrochemical Growth Processes

Doping level change of polythiophene film during its electrochemical growth process

Ex situ and in situ SERS analyses of polybithiophene using roughened Ag and Cu electrodes and multilayer SERS‐active systems

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