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Antifungal activity of ZnO thin films prepared by glancing angle deposition

机译：掠角沉积制备的ZnO薄膜的抗真菌活性

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摘要

Thin films of zinc oxide (ZnO) were produced by reactive DC magnetron sputtering with incidence angles of alpha = 0 degrees, 40 degrees, 60 degrees and 80 degrees (glancing angle deposition configuration), aiming to be tested against the opportunist pathogenic fungus Candida albicans. The results showed the formation of stoichiometric ZnO thin films, with inclined columns for incidence angles equal to or > 40 degrees. All thin films presented high transparency in the visible range above the bandgap region (near 380 nm). The deposition conditions gave rise to a three-fold increase of the surface porosity with the increment of the incidence angle. Noteworthy, is the formation of different types of pores distributions, from micro-, through meso-, to macropores. Regarding the biological effect, the thin films produced with inclined columns presented a significant antifungal activity, with the inhibition of viable cell growth by 68%. Moreover, the formation of mesoporous films enhanced the antifungal properties of ZnO thin films against Candida albicans. The overall behaviour indicates that these thin films are promising candidates to be applied in antimicrobial surfaces, as well as to be used in further studies to determine the molecular mechanisms involved in the antimicrobial action of ZnO.
机译：通过反应性直流磁控溅射法制备入射角为0度，40度，60度和80度（掠角沉积构型）的氧化锌（ZnO）薄膜，旨在针对机会病原性真菌白色念珠菌进行测试。结果表明形成了化学计量的ZnO薄膜，入射角等于或大于40度时具有倾斜的圆柱。所有薄膜在带隙区域（380 nm附近）的可见光范围内均表现出高透明度。沉积条件使表面孔隙率随入射角的增加而增加了三倍。值得注意的是，形成了从微孔，中孔到大孔的不同类型的孔分布。关于生物学效应，用倾斜柱制备的薄膜表现出显着的抗真菌活性，对活细胞生长的抑制作用为68％。而且，中孔膜的形成增强了ZnO薄膜对白色念珠菌的抗真菌性能。总体行为表明，这些薄膜是有希望的候选物，可用于抗菌表面，以及用于进一步研究以确定与ZnO抗菌作用有关的分子机理。

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