Changes induced by electrochemical oxidation of poly(9,9-dioctylfluorene-alt-thiophene): towards a correlation between charge transport, molecular structure modifications and degradation

Barbosa, Camila Gouveia; Bento, Danielly Cristina; Péres, Laura O.; Louarn, Guy; Santana, Henrique de

doi:10.1007/s10854-016-5107-z

Cited by 8 publications

(8 citation statements)

References 33 publications

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“…As already reported in in situ Raman experiments [13], in which the potential was applied under same the conditions as those used for obtaining the EIS in the present study, it was observed that the intensity of the band at 1446 cm -1 suddenly dropped and a new band at 1474 cm -1 was simultaneously observed. This behavior was characterized by the formation of the radical cation in the thiophene ring.…”

Section: Resultssupporting

confidence: 87%

“…The values obtained for the LB films were 2.57 eV (copolymer in solution), 2.53 eV (monolayer), 2.52 eV (5 layers) and 2.52 eV (9 layers). The same band gap value for the copolymer in solution has already been reported in the literature [13].…”

Section: Resultssupporting

confidence: 86%

“…As seen Fig. 1a (spectrum of the pure copolymer dissolved in chloroform), the wide absorption band centered on 430 nm is related to the absorption of the PDOF-co-Th copolymer [13]. One possible explanation for the shift and change observed in the films prepared by the LB and LS techniques is related to the presence of aggregates in these samples, characterized by changes in the absorption and emission spectra, which can be vibronically resolved [14].…”

Section: Characterizationmentioning

confidence: 87%

“…Against this backdrop, the aim of this study was to evaluate the properties of poly[(9,9-dioctylfluorene)-cothiophene] (PDOF-co-Th) deposited on ITO using the Langmuir-Blodgett and Langmuir-Schaeffer techniques. Because of its high fluorescence quantum yield [7,13], the optical properties of this material were investigated by UV-Vis, fluorescence and measurement of luminescence decay time as a function of thickness. The decay time measurements were carried out to complement the photoluminescence results.…”

Section: Introductionmentioning

confidence: 99%

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Thin films of poly[(9,9-dioctylfluorene)-co-thiophene] deposited on ITO by the Langmuir–Schaefer and Langmuir–Blodgett techniques

Bento

Barbosa

Roncaselli

et al. 2016

J Mater Sci: Mater Electron

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The copolymer, poly[(9,9-dioctylfluorene)-cothiophene] (PDOF-co-Th), prepared by the Suzuki reaction, was deposited as thin films on ITO substrates using the Langmuir-Blodgett and Langmuir-Schaefer techniques. The optical properties of the films were studied by UV-Vis reflectance, photoluminescence and time-resolved photoluminescence, and the electrical properties by electrochemical impedance spectroscopy as a function of film thickness. Raman spectroscopy and atomic force microscopy (AFM) were also used with the aim of elucidating the interactions between layers and the morphology of the PDOF-co-Th thin films at the interface with the ITO. The absorption and emission spectra showed shifts and alterations in the intensities of the bands as a function of film thickness, related to the formation of aggregates and increases in the radiation selfabsorption effect. The Nyquist and Bode phase diagrams revealed that the charge transfer process at the ITO/PDOFco-Th/electrolyte interfaces was enhanced as the number of layers increased. Raman spectra of monolayer films revealed a preferential interaction between the fluorine rings and the electrode surface that was not strong enough to alter the optical and electrical properties of the copolymer. However, as shown in the AFM images of the PDOF-co-Th film surfaces, there is an increase in roughness and compaction that proves that the material agglomerates as the number of layers increases, suggesting that the thiophene rings also come closer together on the substrate surface, enhancing the charge transfer process at this interface.

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 86%

Section: Characterizationmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Thin films of poly[(9,9-dioctylfluorene)-co-thiophene] deposited on ITO by the Langmuir–Schaefer and Langmuir–Blodgett techniques

Bento

Barbosa

Roncaselli

et al. 2016

J Mater Sci: Mater Electron

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“…Moreover, under higher excitation wavelength (λ exc varying for 320 to 440 nm) a broader unstructured emission profile was obtained for both oligomers. Meanwhile, going from OMPA to OMFA a red-shift of the maximum emission was obtained, indicating an enhancement of the effective conjugation lengths [24,25].…”

Section: Iv-4-steady-state Photoluminescence Spectroscopymentioning

confidence: 95%

Photo-physical effects of the chemical insertion of the dimethyl-amine moiety on the newly synthesized oligophenylene (OMPA)

Chemek¹,

Amor

Taouali³

et al. 2021

Journal of Molecular Structure

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Experimental and Theoretical Examination of the Radical Cations Obtained from the Chemical and Electrochemical Oxidation of 5‐Aminothiazoles

et al. 2017

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Chemical or electrochemical one‐electron oxidation of 5‐N‐arylaminothiazoles was found to afford stable radical cations. For chemical oxidation, 1 equivalent of [(4‐BrC6H4)3N][SbCl6] (Magic Blue, MB) was added to CH2Cl2 solutions of the thiazoles, and the thus‐obtained radicals showed light absorption in the near‐infrared region. Electrochemical oxidation also led to bathochromic shifts in the absorption bands, and the obtained spectra were similar to those derived from the chemically oxidized species. These radicals afforded electron paramagnetic resonance (EPR) spectra that are consistent with the notion of stable nitrogen radicals (half‐life≤385 h). The EPR spectrum of a thiazole containing 4‐dimethylaminophenyl groups on the nitrogen atom at the 5‐position changed significantly upon adding >3 equivalents of MB. Details of the electronic structures of the experimentally obtained radical cations were generated from theoretical calculations.

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Changes induced by electrochemical oxidation of poly(9,9-dioctylfluorene-alt-thiophene): towards a correlation between charge transport, molecular structure modifications and degradation

Cited by 8 publications

References 33 publications

Thin films of poly[(9,9-dioctylfluorene)-co-thiophene] deposited on ITO by the Langmuir–Schaefer and Langmuir–Blodgett techniques

Thin films of poly[(9,9-dioctylfluorene)-co-thiophene] deposited on ITO by the Langmuir–Schaefer and Langmuir–Blodgett techniques

Photo-physical effects of the chemical insertion of the dimethyl-amine moiety on the newly synthesized oligophenylene (OMPA)

Experimental and Theoretical Examination of the Radical Cations Obtained from the Chemical and Electrochemical Oxidation of 5‐Aminothiazoles

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