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Journal of Nanomaterials
Volume 2011, Article ID 697071, 7 pages
Research Article

Structural Characterization of Emeraldine-Salt Polyaniline/Gold Nanoparticles Complexes

1Institute of Physics of São Carlos (IFSC), University of São Paulo (USP), P.O. Box 369, 13560-970 São Carlos, SP, Brazil
2Institute of Chemistry of São Carlos (IQSC), University of São Paulo (USP), P.O. Box 780, 13560-970 São Carlos, SP, Brazil

Received 21 July 2011; Accepted 29 September 2011

Academic Editor: Chunyi Zhi

Copyright © 2011 E. A. Sanches 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.


Gold nanoparticles (Au NPs) stabilized with polyamidoamine dendrimers (Au-PAMAM) or sodium citrate (Au-CITRATE) were synthesized and complexed with polyaniline emeraldine-salt form (ES-PANI). The complexes were characterized using structural and morphological techniques, including X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Zeta Potential analyses, and Fourier-Transformed Infrared spectroscopy (FTIR). When the Au-CITRATE NPs are added to the polymeric solution, the formation of a precipitate is clearly observed. The precipitate exhibited a different morphology from that found for ES-PANI and Au-CITRATE NPs, suggesting the formation of ES-PANI coating over the surface of Au-CITRATE NPs. On the other hand, when the Au-PAMAM NPs are incorporated into the ES-PANI solution, none interaction was observed, probably due to the repulsive electrostatic interactions, being the organization of the ES-PANI chains unaffected by the presence of the Au-PAMAM NPs.