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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Santos Pedroso, Cassio Cardoso [1] ; Junqueira, Vania [2] ; Lacerda Rubinger, Carla Patricia [2] ; Martins, Tereza Silva [1] ; Faez, Roselena [1, 3]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, LMH, BR-09913030 Diadema, SP - Brazil
[2] Univ Fed Itajuba, Inst Ciencias Exatas, Dept Fis & Quim, BR-37500903 Itajuba, MG - Brazil
[3] Univ Fed Sao Carlos, Lab Mat Polimer & Biossorventes, BR-13600970 Araras, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Synthetic Metals; v. 170, p. 11-18, APR 15 2013.
Web of Science Citations: 11
Abstract

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. (AU)