INFLUENCE OF NICKEL DOPING CONCENTRATION ON THE CHARACTERISTICS OF NANOSTRUCTURE CuS PREPARED BY HYDROTHERMAL METHOD FOR ANTIBACTERIAL ACTIVITY

Pure and nickel doped copper sulfide (CuS) nanostructure were prepared by hydrothermal method for 5 h at 150 degrees C. Structural, morphological and optical properties of the CuS nanostructure were studied for different Ni-doping concentration of 1%, 2%, 3%, 4%, and 5 %. X-ray diffraction studies showed the polycrystalline nature with hexagonal phase structure of CuS and Ni: CuS nanostructure. FE-SEM image showed that nickel doping concentration affected the nanostructure morphology. The absorbance spectra were then recorded at wavelengths ranging from 350 nm to 1000 nm, where the CuS nanostructures have strong absorbance in the NIR. The optical band gap energy of the samples increased as nickel concentration increasing. In particular, their optical band gap energies were 3.25, 3.48, 3.49, 3.49, 3.45 and 3.44 eV for undoped and Ni-doped CuS nanostructure with concentrations (1%, 2%, 3%, 4% and 5%), respectively. The antibacterial activity of Copper sulfide nanostructure against P. aeruginosa, E. coli, and S. aureus was evaluated by zone of inhibition. The test revealed that copper sulfide nanostructure have a strong antibacterial activity against gram-positive than for gram-negative with low concentration of CuS.

Automated summary

Pure and nickel-doped copper sulfide nanostructures were prepared by hydrothermal method and their structural, morphological, and optical properties were studied. It was found that nickel doping concentration influenced the morphology of the nanostructures, and the optical band gap energy of the samples increased with increasing nickel concentration. The antibacterial activity of copper sulfide nanostructures against different bacteria was evaluated, showing stronger activity against gram-positive bacteria at low concentrations.