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

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

Author Franca, Debora Google Scholar
Rebessi, Ana Claudia Google Scholar
Lacerda Rubinger, Carla Patricia Google Scholar
Ribeiro, Geraldo Mathias Google Scholar
Camilo, Fernanda Ferraz Autor UNIFESP Google Scholar
Faez, Roselena Google Scholar
Abstract 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.
Keywords Electrical Conductivity
Silver Nanoparticles
Polypyrrole
In Situ Polymerization
Surfactant
xmlui.dri2xhtml.METS-1.0.item-coverage Valencia
Language English
Sponsor FAPESP
FAPEMIG
CAPES
CNPq
Grant number FAPESP: 2007/50742-2
FAPESP: 2011/23742-7
Date 2017
Published in Journal Of Nanoscience And Nanotechnology. Valencia, v. 17, n. 12, p. 9203-9210, 2017.
ISSN 1533-4880 (Sherpa/Romeo, impact factor)
Publisher Amer Scientific Publishers
Extent 9203-9210
Origin http://dx.doi.org/10.1166/jnn.2017.14302
Access rights Closed access
Type Article
Web of Science ID WOS:000417111000075
URI https://repositorio.unifesp.br/handle/11600/58108

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