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

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

Author Barbosa, Camila Gouveia Autor UNIFESP Google Scholar
Bento, Danielly Cristina Google Scholar
Peres, Laura Oliveira Autor UNIFESP Google Scholar
Louarn, Guy Google Scholar
de Santana, Henrique Google Scholar
Abstract 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 (R-CT) 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.
xmlui.dri2xhtml.METS-1.0.item-coverage Dordrecht
Language English
Sponsor CNPq program/special visiting researcher (PVE) [401109/2014-3, 441689/2014-0]
Grant number CNPq: 401109/2014-3
CNPq: 441689/2014-0
Date 2016
Published in Journal Of Materials Science-Materials In Electronics. Dordrecht, v. 27, n. 10, p. 10259-10269, 2016.
ISSN 0957-4522 (Sherpa/Romeo, impact factor)
Publisher Springer
Extent 10259-10269
Origin http://dx.doi.org/10.1007/s10854-016-5107-z
Access rights Closed access
Type Article
Web of Science ID WOS:000384418600037
URI https://repositorio.unifesp.br/handle/11600/57024

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