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Journal of Nanomaterials
Volume 2015 (2015), Article ID 129678, 8 pages
Research Article

Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

1Departamento de Física (DF), Universidade Federal do Amazonas (UFAM), 69077-000 Manaus, AM, Brazil
2Universidade de São Paulo (USP), Instituto de Física de São Carlos (IFSC), 13566-590 São Carlos, SP, Brazil

Received 28 April 2015; Accepted 28 July 2015

Academic Editor: Mohamed Bououdina

Copyright © 2015 Edgar 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.


Polypyrrole (PPY) powder was chemically synthesized using ferric chloride (FeCl3) and characterized by X-ray diffraction (XRD), Le Bail Method, Fourier Transform Infrared Spectrometry (FTIR), and Scanning Electron Microscopy (SEM). XRD pattern showed a broad scattering of a semicrystalline structure composed of main broad peaks centered at 2 = 11.4°, 22.1°, and 43.3°. Crystallinity percentage was estimated by the ratio between the sums of the peak areas to the area of amorphous broad halo due to the amorphous phase and showed that PPY has around 20 (1)%. FTIR analysis allowed assigning characteristic absorption bands in the structure of PPY. SEM showed micrometric particles of varying sizes with morphologies similar to cauliflower. Crystal data (monoclinic, space group P 21/c, (2) Å, (2) Å, (2) Å,  Å, (2) Å and  Å) were obtained using the FullProf package program under the conditions of the method proposed by Le Bail. Molecular relaxation was performed using the density functional theory (DFT) and suggests that tetramer polymer chains are arranged along the “” direction. Average crystallite size was found in the range of 20 (1) Å. A value of 9.33 × 10−9 S/cm was found for PPY conductivity.