EFFECT OF HE-NE AND DIODE LASER INDUCED NANOPOWDER ZINC SULFIDE (ZnS)

Abstract

Materials have unique optical, electronic or mechanical properties, with the structure at the nano scale. The major advantage of laser processing is that it produces a better quality product with minimum distortion at a high rate. In this work we investigated the nanopowder zinc sulfide and its dealing with He-Ne laser and Diode laser are studied. Zinc sulfide or Zinc sulphide (ZnS) is an inorganic compound , where it mainly occurs in the minerals sphalerite and wurtzite. Both sphalerite and wurtzite are intrinsic, wide band gap semiconductors. ZnS is white in color and it is transparent. In this study, we record the impact of laser processing nanopowder zinc sulfide. The laser irradiated samples are characterized and identified by UV-visible absorption, FTIR spectra, Fluorescence Spectroscopy, DLS studies, SEM and X-ray diffraction. In the UV visible spectrum, it certified the presence of ZnS with the average band gap energy 6.14-6.34 eV. From the analysis of XRD and SEM we can say that the nano particle ZnS has the tetrahedral structure and crystalline size in the range of 24.79 nm to 35.04 nm (XRD) and approximately 200 nm diameters and more than 1 µm in length (SEM). From the DLS studies the particle size varies from 93.7 nm to 142.9 nm. At room temperature the excitation wavelength (λexc) varies between 570.00 nm and 570.29 nm from Fluorescence spectroscopy studies. In the FTIR spectra it has been found various functional groups present in the ZnS. The results of XRD and SEM are nearly equal values.