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Abstract
Nanoparticles form a link between molecular and bulk state ofmatter and exhibit size dependent physical and chemical properties. In the present work we aimed to prepare zinc sulfide (ZnS) nanoparticles by chemical precipitation method using sodium sulfide (Na2S.x H2O) as sulfur source and Zinc acetate dihydrate ((CH3COO)2Zn.2H2O) as a source of zinc . Characterization was performed by UV–Vis Spectroscopy, X-ray diffraction (XRD) , Fourier transform infrared spectra (FTIR) and transmission electron microscopy (TEM). X-ray Diffraction revealed that the Prepared ZnS nanoparticles comprise a Cubic structure and the average grain size of ZnS is 6.41 nm. UV–Vis spectrum exhibits quantum confinement effect by a very sharp peak around 345 nm remarkably blue shifted compared to its bulk counterpart. The optical band gap of the ZnS nanoparticles was found to be as 4.5 ev which is blue shifted from that of bulk ZnS (340 nm, Eg = 3.7 eV) , TEM micrograph depicts the spherical particles which are agglomerated with size 7.9 nm .
Highlights
Nowadays, there has been considerable concern in semiconductors of nanomaterials because of the quantum size effect that they display
We report the synthesis of zinc sulfide (ZnS) nanoparticles by chemical precipitation method using Sodium sulfide (Na2S.x H2O) as a sulfur source
The cubic ZnS is stable at room temperature, while the hexagonal ZnS is formed at high temperatures. (Kole and Kumbhakar. 2012) The most intense diffraction peak centered at 2θ=28.5o, this set of peaks is characteristic of ZnS in cubic phase which all are in good agreement with, primary reference Calculated from NIST using POWD-12++, Space group: F-43m, The broadening peaks in the X-ray diffraction (XRD) patterns indicates the formation of ZnS nanocrystals of small size
Summary
There has been considerable concern in semiconductors of nanomaterials because of the quantum size effect that they display. Nanocrystalline semiconductors have properties intermediate between those of molecular objects and macrocrystalline solids. Nanocrystalline semiconductors show unusual properties due to the three-dimension confinement of electrons ( Abbas et al 2013). Zinc sulphide (ZnS) is a significant member of the II-VI group inorganic semiconducting material. The interest in ZnS nanoparticles has increased due to their great properties, as direct recombination and large band-gap energy. It is a direct bandgap material and has been used in infrared windows, sensors, photodetectors, and solar cells because of its stability and controllable morphological properties (Lu et al 2004, Yi et al 2019)
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