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首页> 外文会议>Conference on Biomedical Applications of Micro-and Nanoengineering, Dec 16-18, 2002, Melbourne, Australia >Spatially controlled surface chemistry by excimer laser ablation of thin films
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Spatially controlled surface chemistry by excimer laser ablation of thin films

机译：准分子激光烧蚀薄膜的空间控制表面化学

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摘要

Two-dimensional control over the surface chemistry of substrate materials is of interest to a wide range of applications from microelectronics to biomedical diagnostics. Here, we describe a general principle for creating spatially controlled surface chemistries by subsequent deposition of thin plasma polymer coatings followed by laser ablation. The creation of surfaces with spatially controlled wettability was used as an example. Plasma polymerization of n-heptylamine produced a hydrophilic surface on silicon wafer substrates while subsequent plasma polymerization of perfluoro-1,3-dimethylcyclohexane produced a hydrophobic surface. Excimer laser ablation at an energy density of 125 ml/cm~2 was used to remove a defined thickness of the two-layer coating, completely removing the upper layer without exposing the substrate material. Excimer laser ablation resulted in two-dimensional control over the surface chemistry with a resolution of ca. 1 μm. Surface modifications were characterized by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Contact angle measurements were used to estimate the wettability of modified surfaces. The method was shown to be suitable for the precise control over the location of droplets containing aqueous solutions. In conclusion, the method described here represents an effective tool for the production of substrates with spatially controlled surface chemistry and wettability.
机译：从微电子学到生物医学诊断，对基材材料表面化学的二维控制是广泛应用的兴趣所在。在这里，我们描述了通过随后的薄等离子聚合物涂层的沉积以及随后的激光烧蚀来创建空间受控的表面化学的一般原理。以在空间上控制润湿性的表面的创建为例。正庚胺的等离子体聚合在硅片基板上产生亲水性表面，随后全氟-1,3-二甲基环己烷的等离子体聚合产生疏水性表面。使用能量密度为125 ml / cm〜2的受激准分子激光烧蚀来去除两层涂层的确定厚度，从而完全去除上层而不暴露基板材料。准分子激光烧蚀导致表面化学的二维控制，分辨率约为。 1微米表面改性通过X射线光电子能谱（XPS）和原子力显微镜（AFM）进行表征。接触角测量用于估计改性表面的润湿性。结果表明该方法适用于精确控制含有水溶液的液滴的位置。总之，这里描述的方法代表了一种有效的工具，用于生产具有空间受控的表面化学和可湿性的基材。

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