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Hybridization of Nickel Oxide Nanoparticle with Carbon Dots and its Application for Antibacterial Activities.

Nickel oxide nanoparticles (NiO NPs), composite with carbon dots (C-dots), (NiO NPs@C-dots) were synthesized, characterized and then its antibacterial activity was evaluated. NiO NPs was prepared using Buddleja polystachya Fresen leaf extract and Ni (NO3 )2 .6H2 O as precursors. The C-dots were synthesized from benzene-1-4-diammine and citric acid. The cubic in phase of NiO NPs and NiO NPs@C-dots with their average particle sizes distributions of 21.47+0.56 and 21.61+0.34 nm were shown, respectively. The surface morphology of NiO NPs@C-dots by FE-SEM also revealed a large surface area, which is advantageous for the titled application. The XRD result indicated cubic face wurtzite structure and crystalline nature of NiO NPs. The carbon-doped compounds have no influence on crystal structure of NiO compound and no new peaks were observed. The antibacterial activity of a composite made up of NiO NPs@C-dots was tested, as well as the antibacterial activities of produced compounds, against human photogenic bacterial strains. Both NiO NPs and NiO NPs@C-dots are found to be powerful against all bacterial strains, according to the bioassay results. NiO nanoparticles and NiO@C-dots appeared to display strong to inhibitory effect (14-20 mm) and (17-23mm), respectively.