Likius S. Daniel, Moses T. Joseph, Veikko Uahengo, Marius Hedimbi
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引用次数: 0
摘要
为了研究金属银纳米粒子/二氧化钛(Ag-NP)/二氧化钛复合薄膜对大肠埃希氏菌(ATCC 25922)的抗菌效果,我们采用分子前驱体法,在 600 °C 的温度下在石英玻璃基底上制备了含不同量 Ag(10 mol% ≤ n ≤ 80 mol%)的 COMP-Agn。通过 X 射线衍射、X 射线光电子学、扫描电子显微镜、透射电子显微镜、光致发光和紫外可见光技术对薄膜进行了表征。分析表明,薄膜由嵌入锐钛矿和金红石混合物基质中的金属 Ag-NPs 组成,银的体积分数在 0.18 到 0.68 之间。TiO2 薄膜和 COMP-Agn 的抗菌活性是通过盘扩散和活细胞计数法测定的。在暗光和可见光下,纯二氧化钛和纯银薄膜都没有表现出明显的抗菌性。据观察,复合薄膜中的银含量在最大增加 70% 时仍具有抗菌性。该模型是在 Ag NPs 向 COMP-Agn 的 TiO2 传导带进行光激发电子转移的基础上提出的,阐明了影响光响应的主要因素,并通过表面等离子体共振实现了对可见光的优异响应。
Antibacterial Activity of Visible Light Responsive-Silver-Nanoparticle/Titania Composite Thin Films with Unprecedently Higher Amounts of Silver
To study the antibacterial efficacy of metallic Ag nanoparticle/titania (Ag-NP)/TiO2 composite thin films against Escherichia coli (ATCC 25922), COMP-Agn with various amounts of Ag (10 mol% ≤ n ≤ 80 mol%) are fabricated on a quartz glass substrate at 600 °C using the molecular precursor method. The films are characterized by X-ray diffraction, X-ray photoelectron, scanning electron microscopy, transmission electron microscopy, photoluminescence, and UVvis techniques. The analysis reveals that the films are composed of metallic Ag-NPs embedded in a mixture of anatase and rutile matrix, with a volumetric fraction of Ag ranging from 0.18 to 0.68. The antibacterial activity of the TiO2 thin film and COMP-Agn are determined by disk diffusion and viable cell count methods. Neither pure TiO2 nor pure Ag films exhibit any discernible antibacterial under dark and visible light. The antibacterial of Ag content in composite films is observed to persist for a maximum increase of 70%. The model is proposed on the basis of photoexcited electron transfer from Ag NPs to the TiO2 conduction band of COMP-Agn, which clarifies the main factors affecting the photoresponse and the excellent response to visible light via surface plasmon resonance.
期刊介绍:
Advanced Materials Interfaces publishes top-level research on interface technologies and effects. Considering any interface formed between solids, liquids, and gases, the journal ensures an interdisciplinary blend of physics, chemistry, materials science, and life sciences. Advanced Materials Interfaces was launched in 2014 and received an Impact Factor of 4.834 in 2018.
The scope of Advanced Materials Interfaces is dedicated to interfaces and surfaces that play an essential role in virtually all materials and devices. Physics, chemistry, materials science and life sciences blend to encourage new, cross-pollinating ideas, which will drive forward our understanding of the processes at the interface.
Advanced Materials Interfaces covers all topics in interface-related research:
Oil / water separation,
Applications of nanostructured materials,
2D materials and heterostructures,
Surfaces and interfaces in organic electronic devices,
Catalysis and membranes,
Self-assembly and nanopatterned surfaces,
Composite and coating materials,
Biointerfaces for technical and medical applications.
Advanced Materials Interfaces provides a forum for topics on surface and interface science with a wide choice of formats: Reviews, Full Papers, and Communications, as well as Progress Reports and Research News.