Background: Nanotechnology is believed to be a future for new human generations.
Among different emerging materials, the nanocomposites (NCs) would be on front line. The aim of
the current study is provide a way to synthesis the ZnS-polyacrylamide NCs with emphasizes on the
effect of aging in polymer on its various physical properties.
Objectives: To prepare and study the properties of ZnS-Polymer NCs with drying time in polymer
Methods: ZnS-polyacrylamide NCs samples were synthesized by adding aqueous suspension of ZnS
nanoparticles (NPs) in Sol of acrylamide: bisacrylamide copolymer. These samples were characterized
by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), thermogravimetric analysis
(TGA), Fourier transform infrared (FT-IR), UV-Vis, and Photoluminescence (PL) spectroscopy.
Results: From XRD data analysis, nano phase and zinc blend structure of the material is confirmed.
From SEM images, the pristine ZnS NPs show spherical morphology, and this texture is still preserved
in the polymer composites. FT-IR confirms that there is strong interaction between polymer
chain and ZnS NPs. The TGA results indicate that the incorporation of the NPs impacts the thermal
properties of the ZnS-polymer NCs and displaying higher thermal stability than the pure polymer
matrix. The optical data predicts the band gap and Quantum Confinement Effect (QCE) and reduction
of ZnS NPs within the polymer matrix. These NCs show emission in blue region with decreases
in intensity with drying time.
Conclusion: ZnS NPs incorporated in polyacrylamide ware prepared by copolymer technique. Structural
analysis confirms zinc blend structure. The vibration spectra of composites samples predicts
an interaction between different functional groups of polymer with the metal sulfide. These NCs
show an enhanced thermally stability. The observed optical band show a red shift and quantum confinement
effect. Size calculated by XRD and optical data shows good correlation with each other.
The PL spectra of the NCs exhibits a broad blue emission with excitation (λex = 320 nm). The visible
region emission could be originating from the radiative recombination involving defect states within
the ZnS nanocrystals energy band.