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Abstract
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This study synthesised nanocomposites by incorporating selenium
nanoparticles into polymeric materials, specifically polyethylene oxide
(PEO), polyvinyl alcohol (PVA), and poly(methyl methacrylate) (PMMA).
The investigation focused on their linear, nonlinear, structural, and
formal optical properties. The properties of nanocomposites can be
enhanced by incorporating them into polymeric materials appropriate
for various applications. Nanocomposites are significant in nonlinear
optics (NLO) owing to their substantial nonlinear response and broad
spectral transparency. The three nanocomposites, Se+PEO, Se+PVA and
Se+PMMA, were prepared and characterised through XRD, FESEM,
EDX, FTIR, RSS, and PL techniques. The linear optical properties of the
prepared samples were analysed using UV-VIS spectroscopy at various
concentrations achieved through the addition of different polymers. The
results indicated that an increase in concentration corresponded with a
rise in absorbance at the same wavelength, with Se+PMMA exhibiting a
higher absorbance compared to the other compounds. The fluorescence
of all prepared samples was measured, and the results indicated that an
increase in concentration led to a decrease in fluorescence. The Z-Scan
technique, encompassing both open and closed aperture measurements,
was employed to determine the nonlinear refractive index (n2) and the
nonlinear absorption coefficient (β). The experiment utilised a solid-state
diode laser operating at a wavelength of 405 nm and a power output of
2.94 mW. The Se+PMMA composite exhibits superior nonlinear behaviour
compared to the other nanocomposites.
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