Abstract
Evolution of the UV-induced absorption within the polymer matrix possessing a highly soluble CdS precursor is studied. The initially optically transparent (polymethylmethacrylate based) samples are irradiated by a light-emitting diode operated at 365 nm for different intensities and different temperatures. In situ monitoring of the process is performed at a wavelength of 405 nm where the samples are initially transparent. The study shows that the increase in absorbance is temperature dependent, and at a fixed temperature it is determined by UV exposure rather than the intensity or irradiation time separately. TEM, HR TEM data, as well as data on absorption and luminescent spectra, allow the relation of the optical absorption evolution to the CdS nanoparticles growth process. This provides new valuable information on the kinetics of this phenomenon in UV irradiated polymer films with a soluble precursor.
Highlights
Self-assembly of the species originated from the light-induced precursor destruction can result in nanoparticle formation within the polymer matrix [1,2,3,4,5,6,7]
We have studied the combined effect of heating and UV irradiation on the TEDBCd/PMMA samples
We clarify both of these effects separately by performing the UV irradiation with different intensities and at different temperatures and following the kinetics of induced optical absorption
Summary
Self-assembly of the species originated from the light-induced precursor destruction can result in nanoparticle formation within the polymer matrix [1,2,3,4,5,6,7]. We study UV irradiation of polymer films with bis(1,1,5,5-tetraethyl-2,4dithiobiureto)cadmium(II) [Cd(N(SCNEt2)2)2] (TEDBCd) as a precursor This compound is readily soluble in many organic solvents and could be a very promising candidate as a precursor for photoinduced nanocomposites with polymethylmethacrylate (PMMA) matrix, offering an opportunity to prepare visually transparent PMMA films with a precursor content of up to 10% [24]. The effect of UV radiation on the sample is determined by the exposure (doze) rather than the light intensity and irradiation time separately This result may shed light on the mechanism of nanoparticle nucleation and growth in the photoinduced nanocomposites with soluble CdS precursors
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