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Self assembly of plasmonic core-satellite nano-assemblies mediated by hyperbranched polymer linkers

机译:超支化聚合物接头介导的等离激元核-卫星纳米组装体的自组装

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摘要

The morphology of plasmonic nano-assemblies has a direct influence on optical properties, such as localised surface plasmon resonance (LSPR) and surface enhanced Raman scattering (SERS) intensity. Assemblies with core-satellite morphologies are of particular interest, because this morphology has a high density of hot-spots, while constraining the overall size. Herein, a simple method is reported for the self-assembly of gold NPs nano-assemblies with a core-satellite morphology, which was mediated by hyperbranched polymer (HBP) linkers. The HBP linkers have repeat units that do not interact strongly with gold NPs, but have multiple end-groups that specifically interact with the gold NPs and act as anchoring points resulting in nano-assemblies with a large (~48 nm) core surrounded by smaller (~15 nm) satellites. It was possible to control the number of satellites in an assembly which allowed optical parameters such as SPR maxima and the SERS intensity to be tuned. These results were found to be consistent with finite-difference time domain (FDTD) simulations. Furthermore, the multiplexing of the nano-assemblies with a series of Raman tag molecules was demonstrated, without an observable signal arising from the HBP linker after tagging. Such plasmonic nano-assemblies could potentially serve as efficient SERS based diagnostics or biomedical imaging agents in nanomedicine.
机译:等离子体纳米组件的形态直接影响光学性能,例如局部表面等离子体共振(LSPR)和表面增强拉曼散射(SERS)强度。具有核心卫星形态的组件特别受关注,因为这种形态具有高密度的热点,同时又限制了整体大小。在这里,报告了一种简单的方法,用于具有核-卫星形态的金NP纳米组件的自组装,这是由超支化聚合物(HBP)接头介导的。 HBP接头具有不与金NP强烈相互作用的重复单元,但是具有多个末端基团,这些末端基团与金NP特异性相互作用并充当锚定点,从而导致纳米组件具有较大的(〜48 nm)核,并被较小的核包围(〜15 nm)卫星。可以控制组件中的卫星数量,从而可以调整光学参数,例如SPR最大值和SERS强度。发现这些结果与有限差分时域(FDTD)模拟一致。此外,证明了纳米组件与一系列拉曼标签分子的多路复用,而在加标签后没有HBP接头产生可观察到的信号。这样的等离激元纳米组件可以潜在地充当纳米医学中基于有效SERS的诊断或生物医学成像剂。

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