Delving antibacterial function of titanium-doped zinc oxide through electronic-structure analysis of Hydro-surface: a quantum DFT investigation

Abstract Zinc oxide nanoparticles are a type of nanomaterial that has been widely studied due to their unique physical and chemical features. When metal particles are doped with zinc oxide nanoparticles, it helps reduce toxicity and makes it easier to create very small particles with improved antibacterial and magnetic properties, which could be useful in biomedical uses. In this study, the differences between pure zinc oxide nanoparticles and titanium-doped zinc oxide nanoparticles were examined based on their structure and electronic behavior. The titanium-doped zinc oxide nanoparticles showed strong antibacterial effects against negative bacteria at every tested concentration. A detailed study was performed using DFT calculations at the CAM-B3LYP-D3/6-311+G (d,p) level to investigate how H 2 O is captured by a ZnO or ZnTiO heterocluster. The weak signal strength observed near the parallel edge of the nanocluster sample could be because of the non-spherical arrangement of these heteroclusters caused by H/OH binding. This hypothesis about energy absorption was supported by analyzing the density distributions of TDOS, PDOS, OPDOS, ESP for water-coated ZnO and ZnTiO heteroclusters. An isosurface map showed a larger area involved in H 2 O adsorption on the surface, leading to the formation of hydrated complexes of ZnO-(H + OH − ) and ZnTiO-(H + OH − ) with specific atoms labeled as O1, Zn/Ti, O27, H29, and H30. Based on this, it could be said that the Zn/Ti in the cubic heteroclusters, respectively has a greater ability to accept electrons during H 2 O adsorption. It’s also important to note that when all the surface elements of these heteroclusters are covered by OH − /H + ions, the semiconducting treatment is restored. These findings suggest that the electronic properties can be adjusted by controlling the adsorption position on the surface. Undoped and doped-ZnO with transition metals have shown benefits in medical uses, such as better antibacterial effects, improved imaging, and greater compatibility and stability of the nanoparticles in the body. The findings show that doping ZnO is a useful way to improve their medical properties compared to the normal version and also suggest new possibilities for using ZnO in nanomedicine.