Colloidal plasmonic nanostar antennas with wide range resonance tunability.
Colloidal plasmonic nanostar antennas with wide range resonance tunability.
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DOI：
10.26434/chemrxiv.6552743.v2
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发表时间：
2019-05
期刊：
影响因子：
6.7
通讯作者：
Ted V. Tsoulos;Supriya Atta;M. Lagos;M. Beetz;P. Batson;G. Tsilomelekis;L. Fabris
中科院分区：
文献类型：
--
作者：
Ted V. Tsoulos;Supriya Atta;M. Lagos;M. Beetz;P. Batson;G. Tsilomelekis;L. Fabris
金纳米星具有出众的场增强特性和可调谐的共振模式，可用于创建有效的成像标签、光治疗剂和基于热电子的光催化平台。尽管在共振强度和可调性方面已经成为等离子体纳米粒子的基石，但一些众所周知的限制阻碍了它们的技术实现。在这里，我们提出了一种新的6尖峰纳米星，作为具有大范围等离子体可调谐的三维等离子体纳米天线的缩影，解决了这些公认的固有弱点，这些弱点源于络合物，从而导致了不可计算的形态和有限的样品单分散性。我们协同的计算和实验工作表明，这些纳米星结合了自上而下制造的纳米结构和自下而上合成的纳米结构的独特优势，展示了一种独特的等离子体响应，从单个粒子到整体基本上保持不变。此外，它们表现出多个分离良好的窄共振，其中最强的共振在空间中延伸得比以前在胶体纳米结构周围观察到的任何等离子体模都要远得多。重要的是，形貌和等离子体响应之间独特的密切关联导致这些粒子的共振模式在600到2000 nm之间可调，这是一个独特的特征，可以在尖端技术应用中找到相关性。
Gold nanostars display exceptional field enhancement properties and tunable resonant modes that can be leveraged to create effective imaging tags, phototherapeutic agents, and hot electron-based photocatalytic platforms. Despite having emerged as the cornerstone among plasmonic nanoparticles with respect to resonant strength and tunability, some well-known limitations have hampered their technological implementation. Herein we tackle these recognized intrinsic weaknesses, which stem from the complex, and thus computationally untreatable morphology and the limited sample monodispersity, by proposing a novel 6-spike nanostar, which we have computationally studied and synthetically realized, as the epitome of 3D plasmonic nanoantenna with wide range plasmonic tunability. Our concerted computational and experimental effort shows that these nanostars combine the unique advantages of nanostructures fabricated from the top-down and those synthesized from the bottom-up, showcasing a unique plasmonic response that remains largely unaltered on going from the single particle to the ensemble. Furthermore, they display multiple, well-separated, narrow resonances, the most intense of which extends in space much farther than that observed before for any plasmonic mode localized around a colloidal nanostructure. Importantly, the unique close correlation between morphology and plasmonic response leads the resonant modes of these particles to be tunable between 600 and 2000 nm, a unique feature that could find relevance in cutting edge technological applications.