Optical properties study of hybrid nanocomposite ZnS/Polystyrene

 

R. Boulekroune, L. Bouhdjar, M. Sebais*, O. Halimi and B. Boudine

 

Crystallography Laboratory, Physics Department, Mentouri University, Aïn El-Bey Road, Constantine, Algeria

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The ideal optical properties of quantum dots (QDs) offer the possibility of using them as fluorescent probes in biological staining and diagnostics [1]. Synthesis of the nanoparticles has made great strides in the field of nanotechnologies particularly in optoelectronics. From fundamental research, several theories were proposed to explain the physical properties of this new class of materials techniques [2-3]. The combinations of inorganic and organic species generate new material for the development of new multifunctional devices [4]. Dispersion of inorganic nanoparticles in the polymer matrix is a novel route to synthesize hybrid inorganic– organic nanocomposites. Zinc sulphide (ZnS), a wide band gap II–VI compound semiconductor is a very promising material for its wide applications in electroluminescence and optoelectronic devices. In the present work, we investigated the structural and optical properties of polystyrene (PS) in the presence of ZnS nanoparticles. Zinc sulfide nanocrystals embedded in polystyrene matrix were successfully prepared by using spin coating method. The structural characterization was performed by X-ray diffraction. The ZnS nanocrystals are single crystals of wurtzite phase. The average diameter of the ZnS nanocrystals embedded in polystyrene  is  10.47 nm.  The  room  temperature  UV-visible  absorption  spectra  show  a displacement towards the higher energies of the absorption edge. The spectroscopic and photoluminescence studies were also carried out and the results are discussed.

 

Keywords:  hybrid   nanocomposites,  optical   properties,  spin   coating,  XRD,   UV-Vis,  photo- luminescence