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Selective binding of nanoparticles on surfaces and into polymeric matrices via directed hydrogen bonding interactions

机译：纳米粒子通过定向氢键相互作用选择性地结合在表面和聚合物基质中

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摘要

The attachment of nanoparticles (NPs) onto planar surfaces and into specific phases of block copolymers is an important prerequisite for exerting their function on/in matrices for application in the field of nanotechnology. Besides non-directional binding modes (i.e. interfacial ordering effects) most known methods rely on intermolecular ordering forces to mediate binding of NPs onto surfaces. The approach towards NP-binding onto surfaces relies on directed, multiple hydrogen bonding systems. In this study the modular generation of surfaces and bulk-phases with hydrogen bonding receptors and the stable binding of the NPs onto the derivatized surfaces by atomic force microscopy (AFM) are reported. To this respect surfaces presenting Hamilton-type receptors (displaying association constants > 3×10{sup}4M{sup}(-1)) using Sharpless-1,3-dipolar cycloaddition reactions are prepared in high efficiency. Nanoparticle binding is studied with Au-NPs surface modified with barbituric acid-receptors. Binding of the particles to a surface presenting 100 mol% of receptor shows a highly dense packed layer of Au-NPs on the surface as seen by AFM measurements. The density of the receptors is the important factor in controlling a selective binding process, achieving > 100 fold binding selectivity. The present approach opens an efficient and general mode to direct nanoparticle assembly onto nanoscaled surfaces.
机译：纳米颗粒（NP）在平面表面和嵌段共聚物特定相中的附着是在纳米技术领域中应用其功能的重要先决条件。除了非定向结合模式（即界面有序作用）外，大多数已知方法还依赖于分子间有序作用力来介导NP与表面的结合。将NP结合到表面上的方法依赖于定向的多个氢键系统。在这项研究中，通过原子力显微镜（AFM）报道了具有氢键受体的表面和本体相的模块化生成以及NP在衍生化表面上的稳定结合。为此，以高效率制备了使用Sharpless-1,3-偶极环加成反应的呈现汉密尔顿型受体（显示缔合常数> 3×10 {sup} 4M {sup}（-1））的表面。用巴比妥酸受体表面修饰的Au-NPs研究了纳米粒子的结合。如通过AFM测量所见，颗粒与呈现100mol％受体的表面的结合显示出在表面上的Au-NP的高密度堆积层。受体的密度是控制选择性结合过程，实现> 100倍结合选择性的重要因素。本方法打开了将纳米颗粒组装引导到纳米级表面上的有效且通用的模式。

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