Fabrication of Periodic Arrays of Highly Oriented Plasmonic Heterotrimers via Site-Specific Sequential Colloidal Assembly

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-05-08 DOI:10.1021/acs.nanolett.5c0137610.1021/acs.nanolett.5c01376

Huaining Zha, Shunsheng Ye, Yiting Zhang, Runshi Qiao, Di Zheng, Jing Tao, Yutian Tang, Yutao Sang* and Zhihong Nie*,

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Abstract

Plasmonic nanoarrays show applications in biosensors, nanolasers, and photodetectors, but precisely organizing and orienting nanoparticle (NP) trimers on substrates remains a grand challenge. Here, we present a self-assembly strategy to arrange metallic NPs with distinct diameters into centimeter-scale arrays of highly oriented linear trimers by modulating the balance between capillary forces and coordination–electrostatic interactions. We achieved an 88% yield of plasmonic trimers with ±10° orientation uniformity across 1 cm² substrates by optimizing the ionic strength of the NP solutions. The high uniformity and sub-3-nm interparticle gaps of trimers in arrays enabled the collective polarization-dependent optical responses and high-order plasmonic coupling. Our strategy offers a versatile platform for creating complex nanostructure arrays with heterogeneous assemblies for use in plasmonic devices.

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高取向等离子体异源三聚体周期阵列的位置特异性顺序胶体组装

等离子体纳米阵列在生物传感器、纳米激光器和光电探测器中有广泛的应用，但在衬底上精确地组织和定向纳米粒子三聚体仍然是一个巨大的挑战。在这里，我们提出了一种自组装策略，通过调节毛细力和配位静电相互作用之间的平衡，将不同直径的金属纳米粒子排列成厘米级的高度定向线性三聚体阵列。通过优化NP溶液的离子强度，我们在1 cm2的衬底上获得了88%的等离子体三聚体产率，取向均匀度为±10°。阵列中三聚体的高均匀性和亚3nm的粒子间隙使得集体偏振依赖的光学响应和高阶等离子体耦合成为可能。我们的策略提供了一个多功能平台，用于创建具有异构组件的复杂纳米结构阵列，用于等离子体器件。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.