Proton conduction mechanisms in GPTMS/TEOS-derived organic/silica hybrid films prepared by sol-gel process

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorMonteiro, Daniela A. [UNESP]-
Autor(es): dc.creatorGozzi, Giovani [UNESP]-
Autor(es): dc.creatorChinaglia, Dante Luis [UNESP]-
Autor(es): dc.creatorOliveira, Osvaldo N.-
Autor(es): dc.creatorde Vicente, Fabio S. [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:34:41Z-
Data de disponibilização: dc.date.available2022-02-22T00:34:41Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-09-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.synthmet.2020.116448-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/201845-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/201845-
Descrição: dc.descriptionIn this work, we employed impedance spectroscopy measurements to investigate the electrical properties of hybrid films obtained with the sol-gel process using 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethylorthosilicate (TEOS) at different GPTMS/TEOS molar ratios and temperatures of thermal treatment. For the GPTMS/TEOS-derived samples with 1:1 composition, the DC conductivity (σdc) and charge carrier mobility (μdc) increased linearly with heat treatment temperature from 25 to 80 °C, while σdc increased from 3.2 to 22.4 nS/cm with a 7-fold increase in the GPTMS concentration. These results could be rationalized with the Miller-Abraham model using a charge carrier activation energy of 0.54 ± 0.03 eV. Using FTIR spectroscopy we demonstrated that the structural arrangement of the hybrid matrix involves epoxy ring opening, thus favoring proton conduction, which occurs as in the Grotthuss mechanism via hopping between nearest oxygen atoms of polymerized glycidoxypropyl groups. It is significant that electrical properties of organic/silica matrices can be predicted and tuned for tailored applications using the modeling presented here.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionDepartment of Physics Sao Paulo State University (UNESP) Institute of Geosciences and Exact Sciences-
Descrição: dc.descriptionSao Carlos Institute of Physics University of Sao Paulo (USP), CP 369-
Descrição: dc.descriptionDepartment of Physics Sao Paulo State University (UNESP) Institute of Geosciences and Exact Sciences-
Descrição: dc.descriptionFAPESP: 2011/18149-5-
Descrição: dc.descriptionFAPESP: 2013/14262-7-
Descrição: dc.descriptionCNPq: 427220/2018-1-
Descrição: dc.descriptionCNPq: 444810/2014-5-
Idioma: dc.languageen-
Relação: dc.relationSynthetic Metals-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectConduction mechanisms-
Palavras-chave: dc.subjectEpoxy polymerization-
Palavras-chave: dc.subjectImpedance spectroscopy-
Palavras-chave: dc.subjectOrganic/silica hybrids-
Palavras-chave: dc.subjectProton conductivity-
Palavras-chave: dc.subjectSol-gel-
Título: dc.titleProton conduction mechanisms in GPTMS/TEOS-derived organic/silica hybrid films prepared by sol-gel process-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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