Reversible Assembly and Dynamic Plasmonic Tuning of Ag Nanoparticles Enabled by Limited Ligand Protection,Nano Letters

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Reversible Assembly and Dynamic Plasmonic Tuning of Ag Nanoparticles Enabled by Limited Ligand Protection
Nano Letters ( IF 9.6 ) Pub Date : 2018-07-13 00:00:00 , DOI: 10.1021/acs.nanolett.8b02325
Luntao Liu ₁ , Zongpeng Gao ₁ , Baolai Jiang ₁ , Yaocai Bai ₂ , Wenshou Wang ₁ , Yadong Yin ₂

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Dynamic manipulation of optical properties through the reversible assembly of plasmonic nanoparticles offers great opportunities for practical applications in many fields. The previous success, however, has been limited to Au nanoparticles. Reversible assembly and plasmonic tuning of Ag nanoparticles (AgNPs) have remained a significant challenge due to difficulty in finding an appropriate surface agent that can effectively stabilize the particle surface and control their interactions. Here, we overcome the challenge by developing a limited-ligand-protection (LLP) strategy for introducing poly(acrylic acid) with precisely controlled coverage to the AgNP surface to not only sufficiently stabilize the nanoparticles but also enable effective control over the surface charge and particle interaction through pH variation. The as-synthesized AgNPs can be reversibly assembled and disassembled and accordingly display broadly tunable coupling of plasmonic properties. Compared to the Au-based system, the success in the reversible assembly of AgNPs represents a significant step toward practical applications such as colorimetric pressure sensing because they offer many advantages, including broader spectral tuning range, higher color contrast, a one-pot process, and low materials and production cost. This work also highlights LLP as a new avenue for controlling the interparticle forces, their reversible assembly, and dynamic coupling of physical properties.

中文翻译：

有限配体保护实现的银纳米粒子的可逆组装和动态等离子调谐

通过可逆的等离激元纳米粒子的组装来动态控制光学性能，为许多领域的实际应用提供了巨大的机会。然而，先前的成功仅限于金纳米颗粒。由于难以找到合适的表面活性剂来有效稳定颗粒表面并控制其相互作用，Ag纳米颗粒（AgNPs）的可逆组装和等离子体调节仍然是一项重大挑战。在这里，我们通过开发有限配体保护（LLP）策略来克服挑战，该策略用于将具有精确控制的覆盖率的聚丙烯酸引入到AgNP表面，不仅可以充分稳定纳米颗粒，还可以有效控制表面电荷和pH值变化引起的颗粒相互作用。合成后的AgNP可以可逆地组装和拆卸，因此可以显示出广泛可调谐的等离激元性质耦合。与基于金的系统相比，可逆组装AgNP的成功代表了向实际应用（例如比色压力传感）迈出的重要一步，因为它们具有许多优势，包括更宽的光谱调谐范围，更高的色彩对比度，一锅法，而且材料和生产成本低。这项工作还强调了LLP是控制粒子间力，其可逆组装以及物理性质动态耦合的新途径。AgNPs可逆组装的成功代表了向实际应用（例如比色压力传感）迈出的重要一步，因为它们具有许多优势，包括更宽的光谱调谐范围，更高的色差，一锅法以及较低的材料和生产成本。这项工作还强调了LLP是控制粒子间力，其可逆组装以及物理性质动态耦合的新途径。AgNPs可逆组装的成功代表了向实际应用（例如比色压力传感）迈出的重要一步，因为它们具有许多优势，包括更宽的光谱调谐范围，更高的色差，一锅法以及较低的材料和生产成本。这项工作还强调了LLP是控制粒子间力，其可逆组装以及物理性质动态耦合的新途径。

更新日期：2018-07-13

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