Synthesis of composite nanopowder through Mn doped ZnS-CdS systems and its structural, optical properties

The design of new functional materials is a driving force for the development of advanced materials chemistry. Out of many new-style substances, the fabrication of composite nanopowders possesses attracted considerable attention in industry and academia, as they often exhibit significant advancement in the effect of materials estimate to typical macro and micro combinations. The developed ZnS-CdS composite nanopowders with unique and tailored properties for various applications in the fields of surface-improved catalysis, photonic crystals, nano-electronic and LED appliances, etc. In practice, Mn2+ ions doped ZnS-CdS mixed nanopowders are held in the lead 2-6 bulk solid-state mixture by the control bandwidth of 3.7 and 2.4 eV for ZnS and CdS at room temperature. The present research deals with the preparation, structural and spectral characterizations of transition metal ions doped ZnS-CdS composite nanopowders. X-ray diffraction patterns indexed to the cubic crystalline phase of both ZnS and CdS and the average crystallite size is evaluated using Scherer's formula is in the class of nanometer-range. Morphological images of Mn2+ ions ZnS-CdS composite nanopowders are in unequal mode structure with agglomerated fragment with nano-size. The spectra of optical absorption and EPR reveal the distorted octahedral symmetry. By correlating optical and EPR data, the evaluated bonding parameters suggested that the bonding between the doped ions and ligands are partially covalent. The luminescent spectrum gives the emission bands in UV, blue, and green regions. The calculated CIE chromaticity coordinates from emission spectra give the color perception of the prepared nanocomposites. FTIR spectrum shows the essential oscillating function of ZnS, CdS plus additional active groups. Enhanced paramagnetic nature is observed at room temperature of the prepared material which is intrinsically caused by exchange coupling between the spin of the carriers and local magnetic moments. (C) 2021 Published by Elsevier B.V.

Automated summary

The fabrication of composite nanopowders with tailored properties has attracted significant attention in various fields. The study focuses on transition metal ions doped ZnS-CdS composite nanopowders, analyzing their preparation, structural and spectral characterizations. The results show unique morphological features and covalent bonding between doped ions and ligands, with emission bands in UV, blue, and green regions.