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

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dc.citation.issue10
dc.citation.volume27
dc.contributor.authorBarbosa, Camila Gouveia [UNIFESP]
dc.contributor.authorBento, Danielly Cristina
dc.contributor.authorPeres, Laura Oliveira [UNIFESP]
dc.contributor.authorLouarn, Guy
dc.contributor.authorde Santana, Henrique
dc.coverageDordrecht
dc.date.accessioned2020-07-31T12:47:42Z
dc.date.available2020-07-31T12:47:42Z
dc.date.issued2016
dc.description.abstractIn 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.en
dc.description.affiliationUniv Fed Sao Paulo, Lab Hybrid Mat, Sao Paulo, Brazil
dc.description.affiliationUniv Estadual Londrina, Dept Quim, CCE, BR-86051990 Londrina, Parana, Brazil
dc.description.affiliationUniv Nantes, CNRS, Inst Mat Jean Rouxel, F-44322 Nantes, France
dc.description.affiliationUnifespLaboratory of Hybrid Materials, Universidade Federal de São Paulo (UNIFESP), Diadema, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipCNPq program/special visiting researcher (PVE) [401109/2014-3, 441689/2014-0]
dc.description.sponsorshipIDCNPq: 401109/2014-3
dc.description.sponsorshipIDCNPq: 441689/2014-0
dc.format.extent10259-10269
dc.identifierhttp://dx.doi.org/10.1007/s10854-016-5107-z
dc.identifier.citationJournal Of Materials Science-Materials In Electronics. Dordrecht, v. 27, n. 10, p. 10259-10269, 2016.
dc.identifier.doi10.1007/s10854-016-5107-z
dc.identifier.issn0957-4522
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/57024
dc.identifier.wosWOS:000384418600037
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofJournal Of Materials Science-Materials In Electronics
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.titleChanges induced by electrochemical oxidation of poly(9,9-dioctylfluorene-alt-thiophene): towards a correlation between charge transport, molecular structure modifications and degradationen
dc.typeinfo:eu-repo/semantics/article
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