National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania.
Microbiology Immunology Department, Faculty of Biology, University of Bucharest, Aleea Portocalelor 1-3, 060101, Bucharest, Romania.
Sci Rep. 2023 Jul 3;13(1):10698. doi: 10.1038/s41598-023-37953-w.
Nanostructured surfaces based on silver nanoparticles decorated ZnO-CuO core-shell nanowire arrays, which can assure protection against various environmental factors such as water and bacteria were developed by combining dry preparation techniques namely thermal oxidation in air, radio frequency (RF) magnetron sputtering and thermal vacuum evaporation. Thus, high-aspect-ratio ZnO nanowire arrays were grown directly on zinc foils by thermal oxidation in air. Further ZnO nanowires were coated with a CuO layer by RF magnetron sputtering, the obtained ZnO-CuO core-shell nanowires being decorated with Ag nanoparticles by thermal vacuum evaporation. The prepared samples were comprehensively assessed from morphological, compositional, structural, optical, surface chemistry, wetting and antibacterial activity point of view. The wettability studies show that native Zn foil and ZnO nanowire arrays grown on it are featured by a high water droplet adhesion while ZnO-CuO core-shell nanowire arrays (before and after decoration with Ag nanoparticles) reveal a low water droplet adhesion. The antibacterial tests carried on Escherichia coli (a Gram-negative bacterium) and Staphylococcus aureus (a Gram-positive bacterium) emphasize that the nanostructured surfaces based on nanowire arrays present excellent antibacterial activity against both type of bacteria. This study proves that functional surfaces obtained by relatively simple and highly reproducible preparation techniques that can be easily scaled to large area are very attractive in the field of water repellent coatings with enhanced antibacterial function.
基于银纳米粒子修饰的 ZnO-CuO 核壳纳米线阵列的纳米结构表面，通过结合干法制备技术，如空气热氧化、射频（RF）磁控溅射和热真空蒸发，开发了这种表面。这些技术可以确保其能够抵抗各种环境因素，如水分和细菌的侵害。因此，高纵横比的 ZnO 纳米线阵列可以通过空气热氧化直接在锌箔上生长。进一步通过 RF 磁控溅射在 ZnO 纳米线上包覆一层 CuO 层，通过热真空蒸发在所得的 ZnO-CuO 核壳纳米线阵列上修饰 Ag 纳米粒子。从形貌、组成、结构、光学、表面化学、润湿性和抗菌活性等方面对制备的样品进行了综合评估。润湿性研究表明，天然 Zn 箔和在其上生长的 ZnO 纳米线阵列的水滴附着力很高，而 ZnO-CuO 核壳纳米线阵列（在修饰 Ag 纳米粒子之前和之后）的水滴附着力很低。对大肠杆菌（革兰氏阴性菌）和金黄色葡萄球菌（革兰氏阳性菌）的抗菌测试强调，基于纳米线阵列的纳米结构表面对这两种类型的细菌均具有优异的抗菌活性。这项研究证明，通过相对简单且高度可重复的制备技术获得的功能表面，可以很容易地扩展到大面积，在具有增强抗菌功能的疏水性涂层领域具有很大的吸引力。
