Antibacterial properties of metal polyphenol-based nanomaterials
Using tannic acid and a variety of different metals as raw materials,metal-polyphenol based nano-antibacterial materials(MPNs)were prepared by one-step blending method,and applied to the antibacterial of gram-negative bacteria(E.coli)and gram-positive bacteria(S.aureus).The results showed that MPNs could cooperate photothermal antibacterial strategy with photodynamic antibacterial strategy under light to effectively resist bacteria without triggering bacterial resistance.The metal doping in the MPNs system was helpful to the antibacterial performance of MPNs under light to a certain extent.Taking the antibacterial effect as an indicator,a metal-polyphenol based semiconductor nano-antibacterial material(TA@Fe-TiO2 MPN)with the best antibacterial effect(more than 98％)was screened out,and its antibacterial mechanism was explored through DRS and XPS analysis.The results indicated that due to the oxygen vacancy introduced by TA@Fe on TiO2,TA@Fe-TiO2 MPN had a wide range of light response and enhanced electronic activity which enabled TA@Fe-TiO2 MPN to have enhanced and sustained reactive oxygen production(hydroxyl radical OH and singlet oxygen 1O2)and nearly 100％antibacterial properties under full-band illumination.
metal polyphenol networkphotothermal antibacterial strategyphotodynamic antibacterial strategyantibiotic-free nano-antibacterial materialsoxygen vacancy
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