De Silva Indrasekara Agampodi S, Norton Stephen J, Geitner Nicholas K, Crawford Bridget M, Wiesner Mark R, Vo-Dinh Tuan
Langmuir. 2018 Dec 4;34(48):14617-14623. doi: 10.1021/acs.langmuir.8b02792. Epub 2018 Nov 20.
The use of plasmonic nanoplatforms has received increasing interest in a wide variety of fields ranging from theranostics to environmental sensing to plant biology. In particular, the development of plasmonic nanoparticles into ordered nanoclusters has been of special interest due to the new chemical functionalities and optical responses that they can introduce. However, achieving predetermined nanocluster architectures from bottom-up approaches in the colloidal solution state still remains a great challenge. Herein, we report a one-pot assembly approach that provides flexibility in precise control of core-satellite nanocluster architectures in the colloidal solution state. We found that the pH of the assembly medium plays a vital role in the hierarchy of the nanoclusters. The architecture along with the size of the satellite gold nanoparticles determines the optical responses of nanoclusters. Using electron microscopy and optical spectroscopy, we introduce a set of design rules for the synthesis of distinct architectures of silica-core gold satellites nanoclusters in the colloidal solution state. Our findings provide insight into advancing the colloidal solution state nanoclusters formation with predictable architectures and optical properties.
等离子体纳米平台在从诊疗到环境传感再到植物生物学等广泛领域受到了越来越多的关注。特别是，将等离子体纳米颗粒发展成有序纳米团簇引起了特别的兴趣，因为它们可以引入新的化学功能和光学响应。然而，在胶体溶液状态下通过自下而上的方法实现预定的纳米团簇结构仍然是一个巨大的挑战。在此，我们报道了一种一锅组装方法，该方法在胶体溶液状态下对核-卫星纳米团簇结构的精确控制方面提供了灵活性。我们发现组装介质的pH值在纳米团簇的层级结构中起着至关重要的作用。卫星金纳米颗粒的结构以及尺寸决定了纳米团簇的光学响应。利用电子显微镜和光谱学，我们介绍了一套在胶体溶液状态下合成不同结构的二氧化硅核金卫星纳米团簇的设计规则。我们的发现为推进具有可预测结构和光学性质的胶体溶液状态纳米团簇的形成提供了见解。
