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Optical Response Properties of Stable and Controllable Au Nanorod Monolayer Meta-Arrays
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-05-24 , DOI: 10.1021/acs.jpcc.9b02700
Renming Liu 1 , Li Jiang 2 , Guanghui Liu 1 , Gengyan Chen 3 , Junyu Li 1 , Jin Liu 1 , Xue-Hua Wang 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-05-24 , DOI: 10.1021/acs.jpcc.9b02700
Renming Liu 1 , Li Jiang 2 , Guanghui Liu 1 , Gengyan Chen 3 , Junyu Li 1 , Jin Liu 1 , Xue-Hua Wang 1
Affiliation
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Ordered assemblies of individual metal nanoparticle building blocks have been important platforms in exploring plasmon-based light–matter interactions. Despite the fact that such assemblies have been extensively constructed, the systemic investigations of their optical response properties are lacking. In addition, the poor structural stability of these assembled metastructures treated with organic or inorganic solvents is another issue. Here, we develop a facile and robust approach for constructing structurally stable and controllable Au nanorod monolayer meta-arrays (NRMMAs) vertically aligned on a silicon substrate, via evaporation-induced self-assembly and electron beam exposure. By precisely controlling ζ-potential on the surface of Au nanorods (NRs) and the Debye length of the colloidal dispersion, we demonstrate a good manipulation of the edge-to-edge gap distance between the NRs, which agrees well with our theoretical predictions. Based on this precise control, far- and near-field optical responses of the Au NRMMAs are systematically demonstrated. These controllable and stable vertically aligned Au NRMMAs with abundant, uniform, and tunable “hot spots” provide useful optical material for practical applications.
中文翻译：
稳定和可控的金纳米棒单层元阵列的光学响应特性。
单个金属纳米粒子构件的有序组装已成为探索基于等离激元的光-质相互作用的重要平台。尽管已经广泛地构造了这样的组件，但是仍缺乏对其光学响应特性的系统研究。另外，用有机或无机溶剂处理的这些组装的亚结构的差的结构稳定性是另一个问题。在这里，我们通过蒸发诱导的自组装和电子束曝光，开发了一种结构简单且健壮的方法来构造在硅基板上垂直对齐的结构稳定且可控的Au纳米棒单层元阵列（NRMMA）。通过精确控制金纳米棒（NRs）表面的ζ电位和胶体分散体的德拜长度，我们展示了对NR之间的边到边间隙距离的良好操纵，这与我们的理论预测相吻合。基于这种精确控制，系统地展示了Au NRMMA的远场和近场光学响应。这些可控且稳定的垂直排列的Au NRMMA具有丰富，均匀且可调的“热点”，为实际应用提供了有用的光学材料。
更新日期：2019-05-24
中文翻译：
稳定和可控的金纳米棒单层元阵列的光学响应特性。
单个金属纳米粒子构件的有序组装已成为探索基于等离激元的光-质相互作用的重要平台。尽管已经广泛地构造了这样的组件，但是仍缺乏对其光学响应特性的系统研究。另外，用有机或无机溶剂处理的这些组装的亚结构的差的结构稳定性是另一个问题。在这里，我们通过蒸发诱导的自组装和电子束曝光，开发了一种结构简单且健壮的方法来构造在硅基板上垂直对齐的结构稳定且可控的Au纳米棒单层元阵列（NRMMA）。通过精确控制金纳米棒（NRs）表面的ζ电位和胶体分散体的德拜长度，我们展示了对NR之间的边到边间隙距离的良好操纵，这与我们的理论预测相吻合。基于这种精确控制，系统地展示了Au NRMMA的远场和近场光学响应。这些可控且稳定的垂直排列的Au NRMMA具有丰富，均匀且可调的“热点”，为实际应用提供了有用的光学材料。
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