Structural and Conductivity Relationship of Binary and Ternary Composites of Polypyrrole, Montmorillonite and Silver

Autor(es)

Franca, Debora ^[1] ; Rebessi, Ana Claudia ^[1] ; Lacerda Rubinger, Carla Patricia ^[2] ; Ribeiro, Geraldo Mathias ^[3] ; Camilo, Fernanda Ferraz ^[4] ; Faez, Roselena ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Lab Polymer Mat & Biosorbents, Campus Araras, Rodovia Anhanguera, Km 174-SP-330, BR-13600970 Araras, SP - Brazil

^[2] Univ Fed Itajuba, Phys & Chem Inst, BR-13610180 Itajuba - Brazil

^[3] Univ Fed Minas Gerais, Phys Dept, Belo Horizonte, MG - Brazil

^[4] Univ Fed Sao Paulo, Lab Hybrid Mat, BR-31270901 Diadema - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Nanoscience and Nanotechnology; v. 17, n. 12, p. 9203-9210, DEC 2017.
• Citações Web of Science: 1

Resumo

This work focuses on the synthesis of binary composites of polypyrrole and silver and of ternary composites of polypyrrole, silver and organomontmorillonite performed in the presence of mixtures of two surfactants, sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB), in aqueous media. Polypyrrole-silver composites were obtained easily by the direct oxidation of pyrrole by silver nitrate using surfactant mixture. These samples exhibited polypyrrole doped with dodecylsulfate and nitrate and silver contents varied between 60 and 90 wt.%. The electrical conductivity is highly dependent on SDS/CTAB presence and proportions. NO3- acts as the main dopant in the absence of surfactants and the resistivity reaches the highest for PPy-OMt composites compared to silver-content ones. Besides the dopant effect, the surfactants mixtures have noticeable influence on silver particle size and morphology. In ternary composites the silver nanoparticles were spherically (around 100-200 nm) and well dispersed in the polymeric matrix. Activation energy, density of states and hopping characteristic length were calculated and it was found to be influenced by intercalating doped polypyrrole into the layers of montmorillonite in the presence of the Ag and surfactant. One-dimensional Mott's variable range hopping process was observed and interpreted in terms of straightening and linearization of the polymer chains. (AU)

• Processo FAPESP: 11/23742-7 - NBR/Polipirrol-montmorilonita: síntese, processamento e caracterização
• Beneficiário: Débora França
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 07/50742-2 - Preparação, caracterização e avaliação de propriedades de polímeros condutores híbridos nano-estruturados em meio não convencional
• Beneficiário: Roselena Faez
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores