Structural and Optical Properties of Zno and Zno/PS Core-Shell Nano Composites Neha Narang 1,2 , Anand K. Tyagi 1 Department of Applied Science, S.SB.S.State technical Campus, Ferozpu(Punjab) Department of Physics, I.K. Gujral Punjab technical University, Kapurthala(Punjab) Abstract The Core-shell structured nanoparticles of ZnO-PS were successfully synthesized in PS matrix by wet chemical method and transparent thin films of these nano-hybrids were coated on substrates by using spin coating technique. The XRD spectra of ZnO nanoparticles demonstrates a series of characteristic peaks that were in accordance with the XRD pattern of wurtzite phase, hexagonal ZnO structure. The crystallite sizes in ZnO, and ZnO/PS, corresponding to 101 plane, are found. Structural and optical properties of all the nanocomposites samples were investigated by XRD, HRTEM, EDX, FTIR and UV-Visible spectroscopy. Keywords : Polystrence, ZnO, structural and optical parameters 1. Introduction Nano-particles are frequently delineated as engineering groups of less than 100 nm size with different shapes. The Nanoparticles have generally improved chemical, as well as, physical properties in comparison to the bulk polycrystalline materials or single crystals because of the large surface area per unit mass and possess high reactivity as a consequence of quantum dimensions[1,2]. Nanoparticles are rapidly gaining importance in various sectors, such as food and feed, health care, environmental health, mechanics, optics, specialties in the medical sciences, physics, chemical industries, drug and gene administration, industrial area, energy science, catalysis, optoelectronics, optical devices and photo electrochemical requisitions. Polystyrene (PS) is a universally useful, surely understood, every now and again used, light weight, renowned plastic with commendable dimensional accuracy, easy synthetic processing, simple handling and less cost[3, 4]. It has been generally used in gadgets, family unit machines, packing materials, and so on. Some of the very important metal oxide inorganic particles include Magnesium oxide (MgO), Zinc Oxide (ZnO) and Titania (TiO 2 ). Due to broad band gap, MgO Journal of University of Shanghai for Science and Technology ISSN: 1007-6735 Volume 22, Issue 12, December - 2020 Page-359