Synthesis of Conductive PPy-SiO2 Aerogels Nanocomposites by In Situ Polymerization of PyrroleReport as inadecuate




Synthesis of Conductive PPy-SiO2 Aerogels Nanocomposites by In Situ Polymerization of Pyrrole - Download this document for free, or read online. Document in PDF available to download.

Journal of Nanomaterials - Volume 2015 2015, Article ID 658476, 6 pages -

Research Article

Polymer and Composites Laboratory, Department of Mechanical Engineering, Federal University of Santa Catarina, 88040-900 Florianópolis, SC, Brazil

Laboratory of Electrical Materials, Department of Electrical Engineering, Federal University of Santa Catarina, 88040-900 Florianópolis, SC, Brazil

Received 11 January 2015; Revised 2 April 2015; Accepted 4 April 2015

Academic Editor: Ungyu Paik

Copyright © 2015 Daliana Muller et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Electrical conductive nanocomposite aerogels were synthesized through in situ oxidative polymerization of pyrrole Py using ammonium persulfate APS as an oxidizing agent in SiO2 gels. The effect of Py concentration on the electrical conductivity and physical and morphological properties of aerogels SiO2-PPy was evaluated. B.E.T. analysis indicated that the surface area of the composite SiO2-PPy decreases with increasing concentration of Py. CHN analysis showed an increase in the amount of PPy, from 13 wt.% to 23 wt.%, with increasing concentration of pyrrole synthesis. FTIR-ATR analysis of the composites revealed bands in the region of 1500–1400 cm

, indicating the presence of the conductive polymer in the silica aerogel as well as the characteristic bands of Si-O-Si and Si-OH covalent bonds. TEM micrographs revealed the presence of particles of PPy with the increased size of the nanoparticles. The composites were successfully applied as passive components, in RC circuits, for low-pass frequency filters. The filters exhibited a cutoff frequency at approximately 435 Hz. The aerogels obtained in this work exhibited suitable electrical conductivity for use in various other applications in electronics.





Author: Daliana Muller, Geneviève K. Pinheiro, Tatiana Bendo, Alberto J. Gutiérrez Aguayo, Guilherme M. O. Barra, and Carlos R. Ram

Source: https://www.hindawi.com/



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