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

Date
2013-04-15Author
Santos Pedroso, Cassio Cardoso [UNIFESP]
Junqueira, Vania
Lacerda Rubinger, Carla Patricia
Martins, Tereza Silva [UNIFESP]
Faez, Roselena [UNIFESP]
Type
ArtigoISSN
0379-6779Is part of
Synthetic MetalsDOI
10.1016/j.synthmet.2013.02.014Metadata
Show full item recordAbstract
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.
Citation
Synthetic Metals. Lausanne: Elsevier Science Sa, v. 170, p. 11-18, 2013.Sponsorship
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)
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