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Interfacing colloidal graphene oxide sheets with gold nanoparticles

机译：胶体氧化石墨烯片与金纳米粒子的连接

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摘要

Aqueous solutions of graphene oxide (GO) and citrate-stabilised gold nanoparticles (AuNPs) are two classic, negatively charged colloids. Using the surface plasmon resonance spectra of AuNPs as a probe, we illustrate how the two like-charged colloids interact with each other and in so doing, reveal the unique solution behaviour of GO. We demonstrate that the electrical double layer of the GO sheets in water plays a key role in controlling the interaction between GO and AuNPs, which displays a one-way gate effect. It is shown that GO can capture and disperse AuNPs in water in a controllable fashion, without the need for additional chemical linkers. This discovery allows the successful synthesis of uncapped, yet solution-dispersible metal-nanoparticle assemblies. Such metal nanostructures have long been pursued for nano-plasmonics and sensing applications, but have remained difficult to prepare using conventional polymer dispersants. This work also makes clear that the combination of the two-dimensional conformation of GO along with its large molecular size and self-contained functional groups allows it to act as a unique soluble nanocarrier/substrate (the thinnest, functionalised flat substrate possible in nature) for the synthesis of new, soluble functional materials.
机译：氧化石墨烯（GO）和柠檬酸盐稳定的金纳米颗粒（AuNPs）的水溶液是两种经典的带负电荷的胶体。使用AuNPs的表面等离振子共振光谱作为探针，我们说明了两个带负电荷的胶体如何相互作用，并以此揭示了GO的独特溶液行为。我们证明了水中GO薄层的电双层在控制GO和AuNPs之间的相互作用中起着关键作用，这显示了单向门效应。结果表明，GO可以以可控的方式捕获和分散AuNPs在水中，而无需其他化学连接剂。这一发现可以成功合成未封端但可分散在溶液中的金属纳米粒子组件。这种金属纳米结构长期以来一直被追求用于纳米等离激元学和传感应用，但是仍然难以使用常规的聚合物分散剂来制备。这项工作还清楚地表明，GO的二维构象及其大分子尺寸和自包含的官能团的组合使其可以充当独特的可溶性纳米载体/底物（自然界中最薄，功能化的平坦底物）用于合成新的可溶性功能材料。

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