Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

Abstract

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 2θ= 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,a=7.1499(2) Å,b=13.9470(2) Å,c=17.3316(2) Å,α=90 Å,β=61.5640(2) Å andγ=90 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 “c” 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.

Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

“…Considering the XRD analysis shown in Figure(7), one notes that the position in 2θ of every probable Bragg reflections are shown in the XRD pattern of pristine EVA and its composites with different contents of CB/PPy. The appearance of the peaks at 2θ of 21.6 ±0.15 o and 23.8 ± 0.19 o is attributed to the scattering polypyrrole chains at the interplanar spacing according to the previous literature [20]. The broad X-ray peaks indicate the high disorder of PPy matrix and also that the chains of PPy have short range arrangement [21].…”

Nanostructured Polypyrrole-Based Ammonia and Volatile Organic Compound Sensors

“…According to the literature, ferric chloride (FeCl 3 ) is the most used oxidizing agent [93,94,95]. The reaction path is simple: after the addition of the Py in the aqueous solution of FeCl 3 , the anions from the solution come into contact with the neutral polymer matrix changing it into Py + cations spontaneously.…”

Removal of fluoride ions using a polypyrrole magnetic nanocomposite influenced by a rotating magnetic field

“…3b). 4,[28][29][30] The adsorption peaks observed at 1697, 1535, 1452, 1290, 1168, 1031, 957, 779 and 552 cm À1 were characteristic peaks of PPy/ Fe 3 O 4 nanocomposite before uoride adsorption. Aer uoride adsorption, most of the functional groups undergoes a red shi with the peaks of the PPy component of the nanocomposite shiing to 1699, 1542, 1463, 1297, 1168, 1089, 960, 785 and 552 cm À1 .…”