Tuning Optical and Photochemical Sunscreen Properties Using Metal-phenolic Network Coatings
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초록
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This study introduces TiO2-metal-phenolic network hybrid nanoparticles (TiO2-MPN NPs), enhancing sunscreen performance through photochemical suppression and broadening the absorption spectrum. MPNs are formed by complexing tannic acid with metal ions, creating a robust coating shell. This hybridization extends absorption into the high-energy-visible (HEV) light range via a new ligand-to-metal charge transfer photoexcitation pathway, significantly boosting sun protection and ultraviolet-A protection factors by approximately four times. TiO2-MPN NPs reduce photoinduced reactive oxygen species under simulated solar irradiation, alleviating UV- and HEV-induced cytotoxicity in fibroblasts. This work offers an eco-friendly, biocompatible strategy for sunscreen agents, inhibiting their photocatalytic activities while broadening their optical spectrum.