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In this work, chemical oxidation was used to polymerize conjugated polymer "Polypyrrole" at room temperature Graphene nanoparticles were added by in situ-polymerization to get (PPY-GN) nano. Optical and Electrical properties were studied for the nanocomposites. optical properties of the nanocomposites were studied by UV-Vis spectroscopy at wavelength range (200 -800 nm). The result showed optical absorption spectra were normally determined and the result showed that the maximum absorbance wave length at 280nm and 590nm. The optical energy gap has been evaluated by direct transition and the value has decreased from (2.1 eV for pure PPy) to (1.3 eV for 5 %wt. of GN). The optical constants such as the band tail width ΔE was evaluated, the value of ΔE for pure PPy was (0.0949eV) while for 5 wt. % of GN it was (0.5156 eV), It has been observed that the Urbach tail for pure PPy was smaller than that for PPy/GN nanocomposites and it increase as GN concentration increases. The A.C electrical conductivity at range of frequency (103Hz-106Hz) was increased by increasing the frequency and GN concentration about four order of magnitude. The s value was about (0.653-0.962) which means that the mechanism of conductivity is correlated hopping mechanism (C. H. P.). The dielectric constant and dielectric lose were determined and found to decrease with increasing frequency.
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Stejskal J., Trchová M., Bober P., Morávková Z., Kopecký D., Vrňata M., Prokeš J., Varga M., and Watzlová E., Polypyrrole salts and bases: superior conductivity of nanotubes and their stability towards the loss of conductivity by deprotonation. RSC advances, 2016. 6(91): pp. 88382-88391.
Saxena R., Sharma K., Saxena N., and Sharma T., Effect of annealing on structural and optical properties of polypyrrole doped with different acids. Polymer composites, 2009. 30(6): pp. 820-826.
Gupta S., Price C., and Heintzman E., Conducting polymer nanostructures and nanocomposites with carbon nanotubes: Hierarchical assembly by molecular electrochemistry, growth aspects and property characterization. Journal of nanoscience nanotechnology, 2016. 16(1): pp. 374-391.
Pang A.L., Arsad A., and Ahmadipour M., Synthesis and factor affecting on the conductivity of polypyrrole: a short review. Polymers for Advanced Technologies, 2021. 32(4): pp. 1428-1454.
Ganguly S., Bhawal P., Ravindren R., and Das N.C., Polymer nanocomposites for electromagnetic interference shielding: a review. Journal of Nanoscience and Nanotechnology, 2018. 18(11): pp. 7641-7669.
Gill N., Gupta V., Tomar M., Sharma A.L., Pandey O., and Singh D.P., Improved electromagnetic shielding behaviour of graphene encapsulated polypyrrole-graphene nanocomposite in X-band. Composites Science Technology, 2020. 192: pp. 108113.
Hassan S.M., DC electrical conductivity of prepared pure and doped polyaniline salt. Iraqi Journal of Physics, 2017. 15(33): pp. 1-10.
Hassan S.M., Optical Properties of Prepared Polyaniline and polymethylmethacrylate blends. International Journal of Application or Innovation in Engineering Management, 2013. 2(9): pp. 232-235.
Ajmi A., Karoui K., Khirouni K., and Rhaiem A.B., Optical and dielectric properties of NaCoPO 4 in the three phases α, β and γ. RSC advances, 2019. 9(26): pp. 14772-14781.
Vandana M., Ashokkumar S., Vijeth H., Yesappa L., and Devendrappa H. Synthesis and characterization of polypyrrole-graphene quantum dots nanocomposites for supercapacitor application. in AIP Conference Proceedings. 2019. AIP Publishing LLC.
Abdullah N.J., Essa A.F., and Hasan S.M., Optical and Structural Properties of Prepared Polyaniline â€“Graphene (PANI/GN) Nanocomposite. Iraqi Journal of Science, 2021: pp. 138-146.
Hassan S., Ghareeb B., and Jafaar H., AC electrical condutivity for polyaniline prepared in different acidic medium. International journal of basic applied science, 2012. 1: pp. 352-362.