Facile fabrication of configuration controllable self-assembled Al nanostructures as UV SERS substrates
Facile fabrication of configuration controllable self-assembled Al nanostructures as UV SERS substrates
复制标题
轻松制造配置可控的自组装 Al 纳米结构作为 UV SERS 基底
DOI：
10.1039/c8nr08555b
复制
发表时间：
2018-12-28
期刊：
影响因子：
6.7
通讯作者：
Li, Ming-Yu
中科院分区：
文献类型：
--
作者：
Su, Dong;Jiang, Shenglin;Li, Ming-Yu
紫外光激发的Al纳米结构近表面电磁场的共振增强为获得高达单分子量级的复杂混合物的振动信息提供了一种有效而精确的途径。在这项工作中，我们提出了一种简单、经济和大规模的方法来制备自组装的Al NSS，并为SERS衬底的制备提供了系统的结构和尺寸可控的方法。在Volmer-Weber模型的基础上直接利用石笋形状的Al纳米颗粒(NPs)，并随着热处理温度的变化而急剧发展，具有可调的光学性质，导致腺嘌呤分子的振动拉曼信号的最大增强因子高达3.49×10(7)。在相同的温度下，随着沉积厚度的变化，自组装的Al纳米颗粒敏感地从石笋状纳米颗粒演化为蠕虫状纳米颗粒，由于散射引起的光消耗增加，这必然导致Ef显著降低，这是由于稀疏分布的NSS之间的等离子体耦合减少所致。通过FDTD模拟从理论上讨论了SERS衬底的增强效应，为其在生物传感技术中的应用提供了有益的参考。
The resonantly enhanced near-surface electromagnetic field of Al nanostructures (NSs) excited with UV light offers an effective and precise approach to obtain vibration information in complex mixtures up to a single-molecule magnitude. In this work, we propose a facile, cost-effective and large-scale way to fabricate self-assembled Al NSs with systematically controllable configuration and size for the preparation of SERS substrates. The stalagmite-shaped Al nanoparticles (NPs) are directly utilized based on the Volmer-Weber model and drastically develop as a function of the annealing temperature with tunable optical properties, resulting in a maximum enhancement factor of the vibrational Raman signal from adenine molecules up to 3.49 x 10(7). With a variation of the deposition thickness at an identical temperature, the self-assembled Al NSs sensitively evolve from stalagmite-shaped NPs to worm-like nano-mounds with increased light consumption induced by scattering, which inherently leads to a noticeable reduction in the EF due to the reduced plasmon coupling between NSs with the sparse distribution. The enhancement effect of the SERS substrates is theoretically discussed with the FDTD simulation, providing an instructive reference for promising applications in the bio-sensing technique.