Self-Assembly of Au@Ag Core-Shell Nanocuboids into Staircase Superstructures by Droplet Evaporation
Self-Assembly of Au@Ag Core-Shell Nanocuboids into Staircase Superstructures by Droplet Evaporation
复制标题
通过液滴蒸发将 Au@Ag 核壳纳米立方体自组装成楼梯上部结构
DOI：
10.1039/c7nr05767a
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发表时间：
2018
期刊：
影响因子：
6.7
通讯作者：
Wenjie Liang
中科院分区：
文献类型：
--
作者：
Xianzhong Yang;Wenjie Liang
等离激元纳米材料及其组件由于其深刻的光学特性而提供了许多应用。在这项工作中，我们报告了 Au@Ag 核壳纳米立方体（NC）通过两阶段液滴蒸发在垂直和水平方向上自组装成楼梯上部结构。每个楼梯都由均匀排列良好的单层 NC 组成。使用乙醇清洗方法可以大大缩小NC之间的间隙距离，以提高相应的表面增强拉曼散射（SERS）性能。通过时域有限差分 (FDTD) 模拟计算组装的 NC 的 SERS 性能，并使用 4-巯基苯甲酸作为拉曼报告分子对步数进行研究。 EF 随着层数的增加而增加，证明等离激元模式在我们均匀排列的组件中传播良好。
Plasmonic nanomaterials, along with their assemblies, provide numerous applications due to their profound optical properties. In this work, we report the self-assembly of Au@Ag core–shell nanocuboids (NCs) into staircase superstructures in both vertical and horizontal orientations through two-stage droplet evaporation. Each stair is composed of a uniform well-aligned monolayer of NCs. The gap distance between NCs can be greatly shrunk to boost the corresponding surface-enhanced Raman scattering (SERS) performance using an ethanol wash method. The SERS performance of the assembled NCs is calculated by finite-difference time-domain (FDTD) simulation, and studied against the step number using 4-mercaptobenzoic acid as a Raman reporter molecule. The increasing EF with the increase of layer number proves that the plasmon mode propagates well in our uniformly aligned assemblies.