Excess Sulphur Induced Structural and Optical Properties of Green Synthesized CuS Nanostructures

S Kr, Nath, P Kalita
Journal of Basic and Applied Engineering Research   unpublished
In the present work, the Cu/S ratio was maintained by mixing the respective ion complex (0.005M) in volumetric ratio during the synthesis. Both starch and glucose capped CuS show a superior structural and optical properties, when the ratio is kept at 1:2 and 2:3 respectively. The XRD exhibits the formation of polycrystalline CuS with hexagonal structure. The HRTEM shows a spectacular spindle type particle distribution for CuS/starch whereas a well defined distribution of nanorods for
more » ... rods for CuS/glucose. The UV-vis absorption studies show good blue shift of absorption edge for all synthesized materials with an enhancement of band gap to 3-3.4eV as visible from the Tao-plot. The photoluminescence (PL) shows a near UV emission around 367 nm to 396nm. The glucose capped CuS exhibits a spectacular enhancement of PL intensity compared to that of CuS/starch.The Cu/S volumetric ratio is also confirmed from the compositional analysis of EDAX.