Effect of Cu-doping and thermal treatment on antibacterial potential of ZnS nanoparticles

Abstract

A zinc sulphide nanoparticle is important metal sulphide nanoparticles (NP) that have drawn much attention since last decades due to their properties which are tunable and thus their applications in various fields. The microorganisms have the ability to develop the drug degrading enzyme over the period of time. This is one of the biggest challenges for the researchers and scientist. ZnS NPs is a potential antibacterial material and thus can prevent the growth of various harmful microbes. We therefore have reported the annealing effect on synthesized Copper doped ZnS (Cu-ZnS) nanoparticles. We have investigated optical properties of Cu-ZnS nanoparticles with UV–Vis spectroscopy and Raman spectroscopy. XRD spectra and FESEM of synthesized sample have also been investigated. The particle size of synthesized nanoparticle that have been calculated by XRD analysis is about 2–18 nm. From UV– Vis spectra, the change in the energy of bandgap of Cu-ZnS NPs towards higher wavelength side observed due to the effect of annealing at different temperature. This research article provides the understanding of treatment of different temperature on Cu-doped ZnS nanoparticles. The synthesized materials exhibited good antibacterial properties against the tested bacterial strains like Escherichia Coli (Ec), Bacillus subtilis (Bs) and Staphylococcus aureus (Sa). We have reported that the antibacterial activity of Cu-ZnS NPs enhanced on increasing the annealing temperature, which make it potential candidate for antibacterial application.