STRUCTURAL AND OPTICAL STUDIES ON Zn0.98Mn0.02S NANOPARTICLES PREPARED BY CHEMICAL ROUTE WITH DIFFERENT CAPPING AGENTS

摘要

In this article we have reported the synthesis, structural and optical studies of zero dimensional nanostructures (nanoparticles) of ZnS:Mn2+capped with various organic stabilizers. Zinc acetate dihydride, Manganese acetate tetra hydride and sodium sulfide anhydrous were used as precursors in an aqueous medium to synthesize nanoparticles. The capping agents used were poly vinyl pyrrolidone (PVP), Thiophenol and Thiourea. The nanocrystallite powders were characterized by using x- ray diffraction (XRD), Scanning Electron Microscopy(SEM), Energy dispersive analysis of X-rays (EDAX), UV-VIS Spectrophotometer and Photoluminescence(PL) spectrophotometer. The Synthesized nanocrystallites with and without capping agent showed cubic zinc blende structure. The lattice strain and dislocation density were also calculated. The grain sizes estimated from the XRD data are 4.1nm, 2nm, 2.7 nm and 3.7nm respectively. Band gaps of these nanocrystallites were calculated from UV-VIS optical absorption spectra and quantum confinement effect also examined. The photoluminescence properties were studied and the emission peak was observ ed at 554 nm for all the nanoparticles irrespective of capping agent