Changes induced by electrochemical oxidation of poly(9,9-dioctylfluorene-alt-thiophene): towards a correlation between charge transport, molecular structure modifications and degradation
| Autor: | Danielly Cristina Bento, Guy Louarn, Camila Gouveia Barbosa, Henrique de Santana, Laura Oliveira Péres |
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| Přispěvatelé: | Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Departamento de Química, Londrina, State University of Londrina = Universidade Estadual de Londrina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Band gap Analytical chemistry Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry Electrochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Dielectric spectroscopy chemistry.chemical_compound chemistry Electron affinity [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Thiophene Electrical and Electronic Engineering Cyclic voltammetry 0210 nano-technology Spectroscopy ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Materials Science: Materials in Electronics Journal of Materials Science: Materials in Electronics, Springer Verlag, 2016, 27 (10), pp.10259-10269. ⟨10.1007/s10854-016-5107-z⟩ |
| ISSN: | 1573-482X 0957-4522 |
| Popis: | In this work, an alternating copolymer of fluorene and thiophene, the poly(9,9-dioctylfluorene-alt-thiophene) (PDOF-alt-Th), was synthesized by the Suzuki coupling reaction. To confirm its molecular structure, the copolymer was characterized by means of photoelectron, vibrational and optical spectroscopies. Raman scattering and infrared absorption spectra were fully interpreted, with the support of DFT modeling. It was found that the incorporation of thiophene units along the poly(9,9-dioctylfluorene) chain caused a red shifted emission, and thus the UV–Vis spectroscopy was also used to determine the value of the optical band gap and electron affinity. Electrochemical and electrical properties were then investigated by means of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The values of ionization potential (Ip) and the charge transfer resistance (RCT) at different potentials were determined. The EIS results showed an increase of conductivity at the first oxidation potential peak of the compound which was related with the formation of the thiophene radical cation. Consequently, the electroactive behavior of the copolymer was complemented by means of UV–Vis ex situ and Raman-spectroelectrochemical analysis. Finally, electrical, electrochemical and optical changes induced by electrochemical oxidation were presented, and the relationship between molecular structure modifications and charge generation are discussed. |
| Databáze: | OpenAIRE |
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