Currently, there is tremendous interest in the development of surface coatings for outdoor applications that are self-cleaning with strong antibacterial properties. Herein, aniline was polymerized in situ with silver–N-doped TiO2 composites to fabricate PANI–Ag–N–TiO2 nanocomposites, which were then mixed with an acrylic resin to form coatings on type 316L stainless steel. Under UV–Vis light illumination, the PANI–Ag–N–TiO2 coatings delivered a stable photocathodic potential of − 0.79 V, a much larger negative potential than was realized using PANI–N–TiO2 (− 0.55 V) or PANI–TiO2 (− 0.40 V) coatings. The addition of Ag nanoparticles thus greatly enhanced the photo-cathodic response. Antimicrobial experiments demonstrated that the PANI–Ag–N–TiO2 coating offers good antibacterial activity (> 95% inhibition) against E. coli under UV–Vis light irradiation for 30 min, due to the generation of hydrogen peroxide or other reactive oxygen species capable of damaging the membrane of E. coli cells. Results suggest that PANI–Ag–N–TiO2 composite coatings offer good antifouling performance in marine environments.

中文翻译：

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增强聚苯胺-Ag-N 掺杂 TiO2 涂层的光阴极防污/抗菌性能

目前，人们对开发具有强抗菌性能的自清洁户外应用的表面涂层产生了极大的兴趣。在此，苯胺与银-N 掺杂的 TiO2 复合材料原位聚合以制备 PANI-Ag-N-TiO2 纳米复合材料，然后将其与丙烯酸树脂混合以在 316L 型不锈钢上形成涂层。在紫外-可见光照射下，PANI-Ag-N-TiO2 涂层提供了稳定的光阴极电位 - 0.79 V，比使用 PANI-N-TiO2 (- 0.55 V) 或 PANI-TiO2 实现的负电位大得多。 − 0.40 V) 涂层。Ag纳米粒子的添加因此大大增强了光阴极响应。抗菌实验表明，PANI-Ag-N-TiO2 涂层对大肠杆菌具有良好的抗菌活性（> 95% 抑制）。大肠杆菌在紫外-可见光照射下 30 分钟，因为产生过氧化氢或其他能够破坏大肠杆菌细胞膜的活性氧。结果表明，PANI-Ag-N-TiO2 复合涂层在海洋环境中具有良好的防污性能。