Abstract
A novel approach combining atomic layer deposition (ALD) and photodeposition was proposed to prepare stable and antibacterial organic–inorganic composited membrane. These composited membranes were fabricated by atomic-scale coating of titanium on the surface of a commercial polyvinylidene fluoride (PVDF) membrane under vacuum, followed by Au photosensitization under ultraviolet (UV) irradiation. Thus, as-prepared Au-TiO2/PVDF composite membrane could exhibit similar mechanical stability and separation performance as pristine PVDF membrane because of chemisorbing between PVDF and TiO2. We have studied the antibacterial mechanism of increasing surface hydrophilicity to prevent bacterial adhesion and cytotoxic reactive oxygen sterilization. The results showed that light-induced reactive oxygen species dominate the antibacterial process. Additionally, Au-TiO2/PVDF composite membranes have potential degradation ability of dye, such as trace methyl orange in aqueous solution. Our present approach demonstrates great potential for the controllable preparation of inorganic modification on inert organic surface with different compositions and shapes for various applications.
Published Version
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