Structural, Morphological, Vibrational, Thermal and Optical Properties of ZnS Quantum Dots in the Polymer Matrix | Bentham Science

摘要

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 ofthe current study is provide a way to synthesis the ZnS-polyacrylamide NCs with emphasizes on theeffect of aging in polymer on its various physical properties.Objectives: To prepare and study the properties of ZnS-Polymer NCs with drying time in polymermatrix.Methods: ZnS-polyacrylamide NCs samples were synthesized by adding aqueous suspension of ZnSNanoparticles (NPs) in Sol of acrylamide: bisacrylamide copolymer. These samples were characterizedby 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 preservedin the polymer composites. FT-IR confirms that there is strong interaction between polymerchain and ZnS NPs. The TGA results indicate that the incorporation of the NPs impacts the thermalproperties of the ZnS-polymer NCs and displaying higher thermal stability than the pure polymermatrix. The optical data predicts the band gap and Quantum Confinement Effect (QCE) and reductionof ZnS NPs within the polymer matrix. These NCs show emission in blue region with decreasesin intensity with drying time.Conclusion: ZnS NPs incorporated in polyacrylamide ware prepared by copolymer technique. Structuralanalysis confirms zinc blend structure. The vibration spectra of composites samples predictsan interaction between different functional groups of polymer with the metal sulfide. These NCsshow an enhanced thermally stability. The observed optical band show a red shift and quantum confinementeffect. 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 visibleregion emission could be originating from the radiative recombination involving defect states withinthe ZnS nanocrystals energy band.