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Effect of High pH Variation on the Structural and Optical Properties of ZnS Nanoparticles synthesized by chemical route

Abstract

ZnS nanoparticles have been synthesized by chemical route at room temperature between zinc chloride and sodium sulfide in aqueous solution as source materials at different PH (8, 9.5, and 12) respectively. The characterization of the product is examined by X-ray diffraction method (XRD), UV-VIS absorption spectrophotometer, photoluminescence (PL) spectra, atomic force microscopy (AFM), and scanning electron microscopy (SEM). The particle size of ZnS nanoparticle samples are calculated from the XRD patterns for pH (8, 9.5&12) is (11.6, 14.5&12) nm respectively; while the average particle size obtained from the SEM is (16, 14,10) nm. Also, from SEM images the ZnS nanotubes are observed at pH=12. The optical absorption spectra for different values of pH show a strong absorption with a tendency towards the blue shift. The room temperature photoluminescence spectra of the solution show peaks centered at (317,319 &322) nm, indicating an energy gaps of (3.85, 3.88 &3.95) eV respectively.

Ghaida S Muhammed*, Manal M Abdulla

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