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Yh, Chang
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article
High UV-Vis-NIR Light-Induced Antibacterial Activity by Heterostructured TiO<sub>2</sub>-FeS<sub>2</sub> Nanocomposites.
Abstract
<h4>Purpose</h4>Antibiotic resistance issues associated with microbial pathogenesis are considered to be one of the most serious current threats to health. Fortunately, TiO<sub>2</sub>, a photoactive semiconductor, was proven to have antibacterial activity and is being widely utilized. However, its use is limited to the short range of absorption wavelength.<h4>Methods</h4>In this work, heterostructured TiO<sub>2</sub>-FeS<sub>2</sub> nanocomposites (NCs) were successfully prepared by a facile solution approach to enhance light-induced antibacterial activity over a broader absorption range.<h4>Results</h4>In TiO<sub>2</sub>-FeS<sub>2</sub> NCs, FeS<sub>2</sub> NPs, as light harvesters, can effectively increase light absorption from the visible (Vis) to near-infrared (NIR). Results of light-induced antibacterial activities indicated that TiO<sub>2</sub>-FeS<sub>2</sub> NCs had better antibacterial activity than that of only TiO<sub>2</sub> nanoparticles (NPs) or only FeS<sub>2</sub> NPs. Reactive oxygen species (ROS) measurements also showed that TiO<sub>2</sub>-FeS<sub>2</sub> NCs produced the highest relative ROS levels. Unlike TiO<sub>2</sub> NPs, TiO<sub>2</sub>-FeS<sub>2</sub> NCs, under light irradiation with a 515-nm filter, could absorb light wavelengths longer than 515 nm to generate ROS. In the mechanistic study, we found that TiO<sub>2</sub> NPs in TiO<sub>2</sub>-FeS<sub>2</sub> NCs could absorb ultraviolet (UV) light to generate photoinduced electrons and holes for ROS generation, including ⋅O<sub>2</sub> <sup>-</sup> and ⋅OH; FeS<sub>2</sub> NPs efficiently harvested Vis to NIR light to generate photoinduced electrons, which then were transferred to TiO<sub>2</sub> NPs to facilitate ROS generation.<h4>Conclusion</h4>TiO<sub>2</sub>-FeS<sub>2</sub> NCs with superior light-induced antibacterial activity could be a promising antibacterial agent against bacterial infections.