Abstract
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.
Highlights
Polypyrrole (PPy) is a chemical material consisted of a number of joined pyrrole rings [1]
Optical Properties The optical properties of PPy and PPy/GN were recorded by UV-visible spectra, in the wavelength range of (200-800) nm
It was observed that the maximum absorption at the UV region was shifted towards lower wavelengths with increasing the GN concentration, it was at 280 nm and 590 nm, respectively. 3.1.2
Summary
Polypyrrole (PPy) is a chemical material consisted of a number of joined pyrrole rings [1]. Polypyrrole (PPy) is a nondegenerate ground state polymer with two types of chain arrangement including repeating units of aromatic as well as quinoid [2], as shown in Figure (1). To the presence of the double bonds, doping adds charge carriers in the shape of extra electrons or holes into the polymer matrix which results in increasing its electrical conductivity [7, 8].
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