Preparation, characterization and electrical conduction mechanism of polyaniline/ordered mesoporous silica composites

Preparation, characterization and electrical conduction mechanism of polyaniline/ordered mesoporous silica composites

Autor Santos Pedroso, Cassio Cardoso Autor UNIFESP Google Scholar
Junqueira, Vania Google Scholar
Lacerda Rubinger, Carla Patricia Google Scholar
Martins, Tereza Silva Autor UNIFESP Google Scholar
Faez, Roselena Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Univ Fed Itajuba
Universidade Federal de São Carlos (UFSCar)
Resumo In this work, we have shown the preparation of polyaniline (PANI) and mesoporous ordered silica (SBA-15) composites. PANI/SBA-15 composites with different weight ratios were prepared in order to evaluate the electrical conduction mechanism. the analysis of the differential activation energy was carried out for composites, allowing the classification of the variable range hopping as one dimensional for the composites. the hopping parameter as a function of the sample mass ratio indicates that the insertion of aniline into the mesopores improves its intrinsic conductivity. A fibrilar morphology of the conducting PANI is formed by a controlled amount of the added polymer into SBA-15. It was confirmed by SEM and TEM analysis that the composites prepared with different PANI contents have different morphologies, indicating that the amount of polyaniline is crucial to obtain distinct morphologies. SAXS, NAI, TEM and SEM show that SBA-15 maintains its structure even after the polymerization process and the polymer is dispersed on the inorganic matrix. the parameters determined by the investigation of variable range hopping conduction by the differential activation energy method show that the PANI produced in these composites have higher electrical conductivity than pure PANI, possibly due to the improvement of the interparticle, interchain and intrachain processes for the charge transport, which are intimately related to the polymer morphology, fact coherent with SEM and TEM data. (C) 2013 Elsevier B.V. All rights reserved.
Palavra-chave Conducting materials
Polymers
Ordered mesoporous silica
Hopping conduction
Idioma Inglês
Financiador Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
INEO/INCT
Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Número do financiamento FAPESP: 2007/50742-2
CNPq: 577315/2008-0
Data de publicação 2013-04-15
Publicado em Synthetic Metals. Lausanne: Elsevier Science Sa, v. 170, p. 11-18, 2013.
ISSN 0379-6779 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 11-18
Fonte http://dx.doi.org/10.1016/j.synthmet.2013.02.014
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000318667500003
Endereço permanente http://repositorio.unifesp.br/handle/11600/36213

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