Pure and nickel doped copper sulfide (CuS) nanostructure were prepared by hydrothermal method for 5 h at [Formula: see text]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.

中文翻译：

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镍掺杂浓度对水热法制备纳米结构CuS抗菌活性的影响

纯镍掺杂硫化铜（CuS）纳米结构通过水热法在[公式：见正文]C下制备5小时。研究了 1%、2%、3%、4% 和 5% 的不同 Ni 掺杂浓度的 CuS 纳米结构的结构、形态和光学性质。X 射线衍射研究显示了多晶性质，具有六方相结构的 CuS 和 Ni：CuS 纳米结构。FE-SEM图像显示镍掺杂浓度影响纳米结构形态。然后在 350 nm 至 1000 nm 的波长范围内记录吸收光谱，其中 CuS 纳米结构在 NIR 中具有强吸收。样品的光学带隙能量随着镍浓度的增加而增加。特别是，它们的光学带隙能量分别为 3.25、3.48、3.49、3.49、3.45 和 3。对于浓度分别为 1%、2%、3%、4% 和 5% 的未掺杂和 Ni 掺杂的 CuS 纳米结构，为 44 eV。通过抑制区评估硫化铜纳米结构对铜绿假单胞菌、大肠杆菌和金黄色葡萄球菌的抗菌活性。试验表明，硫化铜纳米结构对革兰氏阳性菌的抗菌活性比对低浓度CuS的革兰氏阴性菌强。