Wet Chemical Synthesis and Characterization of MnS Nanoparticles

The MnS nanoparticles were synthesized at ambient temperature by simple wet chemical technique. Manganese acetate (C4H6MnO4 center dot 4H(2)O) was used as source for Mn+2 ions and thioacetamide (C2H5NS) was used as source for S-2 ions. The energy dispersive analysis of X-ray (EDAX) and X-ray diffraction (XRD) were used for stoichiometric and structural characterization of the synthesized nanoparticles respectively. The crystallite size calculated from XRD using Scherrer's formula and Hall-Williamson relation came out to be of 6.81 mu and 5.27 nm respectively. The optical absorption spectra showed absorption edge at 325 mu corresponding to energy of 3.82 eV, which acknowledged the occurrence of blue shift. The photoluminescence spectra recorded for five different excitation wavelengths viz 250, 275, 280, 300 and 325 mu showed three emission peaks at 463 mu, 550 mu and 821 nm. The TEM and SEM analysis of the particles clearly shows the particles are spherical in shape. The selected area electron diffraction (SAED) pattern showed ring pattern, stating the nanoparticles to be polycrystalline. The obtained results are discussed in details.