Abstract
A nanocomposite (NC) of polycarbonate (PC), poly(methyl methacrylate) (PMMA), polyethylene oxide (PEO) and cadmium selenide (CdSe) nanoparticles (NP) was prepared using thermolysis and ex-situ casting techniques. The microstructure and shape of the CdSe NP were characterized with the Rietveld methodology and transmission electron microscopy (TEM). Rietveld refinement of x-ray data indicated that the prepared CdSe NP had the cubic zinc blend structure with a lattice parameter of 6.057 Å. TEM images showed the formation of a dotted shape of CdSe with a particle size around 2 nm, confirming the quantum dot size of the mother phase CdSe. Samples from the prepared PC/PMMA/PEO/CdSe NC films were irradiated with γ ray doses ranging from 5 to 80 kGy. We used UV-vis spectroscopy to investigate the resultant effects of the γ ray irradiation on the optical properties of the prepared films. The effect of the γ ray irradiation on the light absorbance, extinction coefficient, refractive index and optical conductivity of the PC/PMMA/PEO/CdSe NC films was studied. The absorbance of the NC films increased as they were irradiated with the γ ray doses up to 80 kGy, the maximum dose used. The increase in absorbance was accompanied with a decrease in the direct bandgap, from 5.31 to 4.05 eV, and an increase of Urbach energy from 0.44 to 0.89 eV. Also, we used the optical dielectric loss (ε”) to identify the type of microelectronic transition for the PC/PMMA/PEO/CdSe NC films, which was found to be a direct allowed transition. Furthermore, the optical color changes between the pristine and the irradiated films were evaluated using the International Commission on Illumination (CIE) color differences technique. The pristine film was uncolored. It showed significant color alterations when irradiated with γ radiation up to 80 kGy, the maximum dose used.
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