Cristea Daniel, Cunha Luis, Gabor Camelia, Ghiuta Ioana, Croitoru Catalin, Marin Alexandru, Velicu Laura, Besleaga Alexandra, Vasile Bogdan
Materials Science and Engineering Faculty, Transilvania University, Eroilor 29, 500036 Brașov, Romania.
Physics Center, Minho University, Gualtar Campus, 4710-057 Braga, Portugal.
Nanomaterials (Basel). 2019 Mar 23;9(3):476. doi: 10.3390/nano9030476.
Tantalum oxynitride thin films have been deposited by reactive magnetron sputtering, using a fixed proportion reactive gas mixture (85% N₂ + 15% O₂). To produce the films, the partial pressure of the mixture in the working atmosphere was varied. The characteristics of the produced films were analyzed from three main perspectives and correspondent correlations: the study of the bonding states in the films, the efficiency of photo-degradation, and the antibacterial/antibiofilm capacity of the coatings against . X-ray Photoelectron Spectroscopy results suggest that nitride and oxynitride features agree with a constant behavior relative to the tantalum chemistry. The coatings deposited with a higher reactive gas mixture partial pressure exhibit a significantly better antibiofilm capacity. Favorable antibacterial resistance was correlated with the presence of dominant oxynitride contributions. The photocatalytic ability of the deposited films was assessed by measuring the level of degradation of an aqueous solution containing methyl orange, with or without the addition of H₂O₂, under UV or VIS irradiation. Degradation efficiencies as high as 82% have been obtained, suggesting that tantalum oxynitride films, obtained in certain configurations, are promising materials for the photodegradation of organic pollutants (dyes).
采用反应磁控溅射法，使用固定比例的反应气体混合物（85% N₂ + 15% O₂）沉积氮氧化钽薄膜。为了制备薄膜，改变了工作气氛中混合物的分压。从三个主要方面及相应的相关性对所制备薄膜的特性进行了分析：薄膜中的键合状态研究、光降解效率以及涂层对……的抗菌/抗生物膜能力。X射线光电子能谱结果表明，氮化物和氮氧化物特征与钽化学的恒定行为相符。在较高反应气体混合物分压下沉积的涂层表现出明显更好的抗生物膜能力。良好的抗菌抗性与主要的氮氧化物贡献的存在相关。通过测量在紫外或可见光照射下，添加或不添加H₂O₂的含甲基橙水溶液的降解水平，评估了沉积薄膜的光催化能力。已获得高达82%的降解效率，这表明在某些配置下获得的氮氧化钽薄膜是用于光降解有机污染物（染料）的有前景的材料。
