151. Interference effect in surface modified ZnS nanoparticles / Poly (methylmethacrylate) nanocomposites.
- Author
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Romcevic, Nebojsa, Hadzic, Branka, Curcic, Milica, Radojevic, Vesna, Paunovic, Novica, and Romcevic, Maja
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ZINC sulfide , *METHYL methacrylate , *NANOPARTICLES , *NANOCOMPOSITE materials , *OPTICAL materials , *DIELECTRIC function , *OCHRATOXINS - Abstract
Surface modified ZnS nanoparticles / poly (methylmethacrylate) - (PMMA) nanocomposites were prepared by the solution casting method. The ZnS nanoparticles, as starting materials in the present study, were synthesized mechanochemically and their crystallite size was estimated as 2.3 nm. Surface modification of obtained nanoparticles was performed by 3-Mercaptopropyltrimethoxysilane. We investigate thin samples of the nanocomposite material and pure PMMA (about 290 μm) with a strong interference effect, and corresponding thick samples, as reference. The optical properties of this material were studied by far-infrared spectroscopy. The analysis of the far-infrared reflectivity spectra was made by the fitting procedure, according to the model for a thin plate of nanocomposites in the air. The dielectric function of the nanocomposites was modeled as a mixture of homogenous surface modified ZnS spherical inclusions in PMMA, by the Maxwell-Garnet formula. In the case of a PMMA thin sample, intense, well-defined interference was registered in the range of 90 to 200 cm− 1, while significantly weaker and less well-defined interference was registered in the range around 450 cm− 1. In the thin composite sample, in addition to the interference induced by sample thickness, interference induced by the existence of ZnS nanoparticles was also observed, located between the TO and LO phonons of ZnS. This opens the possibility of applying nanocomposites in interferometry. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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