Plasmonic Near-Field Localization of Silver Core–Shell Nanoparticle Assemblies via Wet Chemistry Nanogap Engineering,ACS Applied Materials & Interfaces

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Plasmonic Near-Field Localization of Silver Core–Shell Nanoparticle Assemblies via Wet Chemistry Nanogap Engineering
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1021/acsami.7b13965
Ramesh Asapu ₁ , Radu-George Ciocarlan ₂ , Nathalie Claes ₃ , Natan Blommaerts ₁ , Matthias Minjauw ₄ , Tareq Ahmad ₄ , Jolien Dendooven ₄ , Pegie Cool ₂ , Sara Bals ₃ , Siegfried Denys ₁ , Christophe Detavernier ₄ , Silvia Lenaerts ₁ , Sammy W. Verbruggen _{1,

5}

Affiliation

Silver nanoparticles are widely used in the field of plasmonics because of their unique optical properties. The wavelength-dependent surface plasmon resonance gives rise to a strongly enhanced electromagnetic field, especially at so-called hot spots located in the nanogap in-between metal nanoparticle assemblies. Therefore, the interparticle distance is a decisive factor in plasmonic applications, such as surface-enhanced Raman spectroscopy (SERS). In this study, the aim is to engineer this interparticle distance for silver nanospheres using a convenient wet-chemical approach and to predict and quantify the corresponding enhancement factor using both theoretical and experimental tools. This was done by building a tunable ultrathin polymer shell around the nanoparticles using the layer-by-layer method, in which the polymer shell acts as the separating interparticle spacer layer. Comparison of different theoretical approaches and corroborating the results with SERS analytical experiments using silver and silver–polymer core–shell nanoparticle clusters as SERS substrates was also done. Herewith, an approach is provided to estimate the extent of plasmonic near-field enhancement both theoretically as well as experimentally.

中文翻译：

通过湿化学纳米间隙工程对银核-壳纳米粒子组件的等离子近场定位

银纳米颗粒由于其独特的光学性质而广泛用于等离子体领域。依赖于波长的表面等离子体激元共振引起强烈增强的电磁场，特别是在位于金属纳米粒子组件之间的纳米间隙中的所谓热点处。因此，粒子间距离是等离子体应用（例如表面增强拉曼光谱法（SERS））中的决定性因素。在这项研究中，目的是使用便利的湿化学方法来设计银纳米球的粒子间距离，并使用理论和实验工具来预测和量化相应的增强因子。这是通过使用逐层方法在纳米颗粒周围构建可调节的超薄聚合物壳来完成的，其中聚合物壳用作分离的颗粒间间隔层。还比较了不同的理论方法，并使用银和银-聚合物核-壳纳米粒子簇作为SERS底物，通过SERS分析实验证实了结果。因此，提供了一种方法来在理论上和实验上估计等离子体近场增强的程度。

更新日期：2017-11-17

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