The demand of medical materials for rapid and efficient elimination of bacteria has seen a dramatic surge over the past few years. In this study, antibacterial nanofilms with reactive oxygen species were generated by photocatalysis. To prepare these nanofilms, Ag and amorphous TiO2 nanoparticles decorated on polydopamine (PDA) were coated on three-dimensional (3D) nanopore arrays, which was fabricated on a substrate of anodized stainless steel. All the antibacterial tests were conducted with a household flashlight, which may be considered as a practical approach for antibacterial materials. The photoelectrochemical property of the 3D Ag/TiO2/PDA nanofilm on 316L stainless steel (Ag/TiO2/PDA SS) was about 15 times higher than that of the annealed Ag/TiO2/PDA SS, and consequently, it exhibited higher antibacterial activity. The enhanced photoelectrochemical property is attributed to the successful separation of electrons (amorphous TiO2) and holes (Ag nanoparticles). Further, when a plate containing 3D Ag/TiO2/PDA SS was irradiated with visible light just for 10 min, it immediately destroyed the bacteria in 106 CFU/mL without any bacterial colony. After five weeks, there were still no bacterial colonies in the plate corresponding to Ag/TiO2/PDA SS under visible light, while Ag/TiO2/PDA SS in dark had a negligible effect on the bacteria, i.e., the antibacterial mechanism through direct contact and ion dissolution was not efficient. The excellent antibacterial properties of 3D Ag/TiO2/PDA SS illuminated by flashlight provides an efficient, facile, and cost-effective technique for the development of antibacterial medical materials to meet the increasing demand of eliminating bacterial infections.

中文翻译：

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普通手电筒照射下Ag/TiO2/PDA纳米膜在阳极氧化316L不锈钢基板上的抗菌性能

在过去的几年中，对快速有效消除细菌的医疗材料的需求急剧增加。在这项研究中，通过光催化产生了具有活性氧的抗菌纳米膜。为了制备这些纳米薄膜，在聚多巴胺 (PDA) 上装饰的 Ag 和无定形 TiO2 纳米粒子被涂敷在三维 (3D) 纳米孔阵列上，该阵列是在阳极氧化的不锈钢基板上制造的。所有的抗菌测试都是用家用手电筒进行的，这可能被认为是抗菌材料的一种实用方法。3D Ag/TiO2/PDA 纳米薄膜在 316L 不锈钢 (Ag/TiO2/PDA SS) 上的光电化学性能是退火后的 Ag/TiO2/PDA SS 的 15 倍左右，因此表现出更高的抗菌活性。增强的光电化学性能归因于电子（无定形 TiO2）和空穴（Ag 纳米颗粒）的成功分离。此外，当含有 3D Ag/TiO2/PDA SS 的板仅用可见光照射 10 分钟时，它立即破坏了 106 CFU/mL 的细菌，没有任何细菌菌落。5周后，可见光下Ag/TiO2/PDA SS对应的平板中仍没有细菌菌落，而暗处Ag/TiO2/PDA SS对细菌的影响可以忽略不计，即直接接触的抗菌机制离子溶解效率不高。手电筒照射的 3D Ag/TiO2/PDA SS 的优异抗菌性能提供了一种高效、简便、