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Nanometer-scale Coatings for Nano-structured Solids

机译：纳米结构固体的纳米级涂料

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The concept of surface coatings for property modification is not new, but when the bulk structure to be coated is itself < 100 nanometers in dimension, new challenges emerge. The coating thickness has to be substantially smaller than the bulk dimensions, yet be durable and effective. In this project, some of the plasma assisted functional coatings are being investigated. These coatings appear to be as effective in the 1-2 nm thickness range, as in thicker layers. Since these are deposited by non-line of sight techniques, they are capable of modifying nano-fibers, near net shape cellular foams, and other high porosity materials. Two types of coatings are focused upon initially: (ⅰ) those that make the surface inert and (ⅱ) those designed to enhance surface reactivity and bonding. The former has been achieved by forming 1-2 nm layer of -CF_2- (and/or CF3) groups on the surface, and the latter by creating a nano-layer of SiO_2-type compound. The initial stages of growth of these layers (from atomic clusters to complete mono-layers) have been studied. Quantitative XPS and AFM results appear to correlate very well with physical properties such as wettability, bond formation and fluid infiltration. These studies show that plasma-assisted chemical deposition can be a very viable approach to creating functional nano-coatings on surfaces of nano-structured solids.
机译：用于改性的表面涂层的概念并不是什么新鲜事物，但是当要涂层的整体结构本身的尺寸小于100纳米时，就会出现新的挑战。涂层厚度必须显着小于整体尺寸，但要持久且有效。在这个项目中，正在研究一些等离子体辅助功能涂层。这些涂层似乎在1-2 nm厚度范围内与在较厚的涂层中一样有效。由于这些是通过非视线技术沉积的，因此它们能够改性纳米纤维，近净形多孔泡沫以及其他高孔隙率材料。最初主要关注两种类型的涂料：（ⅰ）使表面呈惰性的涂料和（ⅱ）旨在增强表面反应性和粘结力的涂料。前者是通过在表面上形成1-2 nm的-CF_2-（和/或CF3）基团来实现的，后者是通过形成SiO_2型化合物的纳米层来实现的。已经研究了这些层的生长的初始阶段（从原子团簇到完整的单层）。 XPS和AFM的定量结果似乎与物理特性（如润湿性，键形成和流体渗透）非常相关。这些研究表明，等离子体辅助化学沉积可能是在纳米结构固体表面上创建功能性纳米涂层的一种非常可行的方法。

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