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摘要
<jats:p>We report in this paper antibacterial activity of Ag-doped TiO<jats:sub>2</jats:sub> and Ag-doped ZnO nanoparticles (NPs) under visible light irradiation synthesized by using a sol-gel method. Structural, morphological, and basic optical properties of these samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectrum, and UV-Vis reflectance. Room temperature X-ray diffraction analysis revealed that Ag-doped TiO<jats:sub>2</jats:sub> has both rutile and anatase phases, but TiO<jats:sub>2</jats:sub> NPs only have the anatase phase. In both ZnO and Ag-doped ZnO NPs, the hexagonal wurtzite structure was observed. The morphologies of TiO<jats:sub>2</jats:sub> and ZnO were influenced by doping with Ag, as shown from the SEM images. EDX confirms that the samples are composed of Zn, Ti, Ag, and O elements. UV-Vis reflectance results show decreased band gap energy of Ag-doped TiO<jats:sub>2</jats:sub> and Ag-doped ZnO NPs in comparison to that of TiO<jats:sub>2</jats:sub> and ZnO. Pathogenic bacteria, such as <jats:italic>Staphylococcus aureus</jats:italic>, <jats:italic>Pseudomonas aeruginosa</jats:italic>, and <jats:italic>Escherichia coli</jats:italic>, were used to assess the antibacterial activity of the synthesized materials. The reduction in the viability of all the three bacteria to zero using Ag-doped ZnO occurred at 60 <jats:italic>μ</jats:italic>g/mL of culture, while Ag-doped TiO<jats:sub>2</jats:sub> showed zero viability at 80 <jats:italic>μ</jats:italic>g/mL. Doping of Ag on ZnO and TiO<jats:sub>2</jats:sub> plays a vital role in the increased antibacterial activity performance.</jats:p>
- 出版日期2018
