Silver dendrites decorated filter membrane as highly sensitive and reproducible three dimensional surface enhanced Raman scattering substrates
Silver dendrites decorated filter membrane as highly sensitive and reproducible three dimensional surface enhanced Raman scattering substrates
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DOI：
10.1016/j.apsusc.2016.06.128
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发表时间：
2016-11-30
影响因子：
6.7
通讯作者：
Hao, Yaowu
中科院分区：
文献类型：
--
作者：
Zhao, Bin;Lu, Ya;Hao, Yaowu
我们报告了一种新颖且灵活的表面增强拉曼散射（SERS）基板，其基于装饰有银树枝状纳米结构的过滤膜。 SERS 活性基底是通过电沉积制造的，其中分层银枝晶均匀且牢固地沉积在多孔过滤膜内部和顶部。研究了不同沉积时间下银枝晶的形态演变，并研究了电解质成分的影响。进行有限差分时域 (FDTD) 模拟，揭示了银枝晶被 785 nm 光照射时的电场分布。这种3D SERS活性基底表现出极高的灵敏度和优异的再现性。经测试，罗丹明 6G 的拉曼信号灵敏度高达 1 x 10(-11) M，主拉曼峰的平均强度变化为 12%。此外，所合成的坚固基板在环境条件下几个月内仍表现出高稳定性。这种 3D 环保过滤膜基底不仅提供高密度的 SERS 热点，而且还提供非常大的区域来捕获目标分析物。它在检测环境中的痕量有机污染物方面具有潜在的应用。 (C) 2016 Elsevier B.V. 保留所有权利。
We report a novel and flexible surface enhanced Raman scattering (SERS) substrate based on filter membranes decorated with silver dendritic nanostructures. The SERS-active substrate was fabricated via electrodeposition, where hierarchical silver dendrites were uniformly and firmly deposited within and on the top of the porous filter membranes. The morphological evolution of silver dendrites was investigated at different deposition times, and the effect of the components of electrolyte was also studied. Finite difference time domain (FDTD) simulations were performed to reveal the distribution of electric filed when Ag dendrites were illuminated with 785 nm light. Such 3D SERS-active substrate exhibits extremely high sensitivity and excellent reproducibility. Raman signal sensitivity for rhodamine 6G was tested as high as 1 x 10(-11) M with 12% average intensity variations at the major Raman peak. Additionally, the as-synthesized robust substrate displays high stability under an ambient condition for several months. This 3D eco-friendly filter membrane-based substrate provides not only high density of SERS hot spots, but also a very large area for capturing target analytes. It has potential applications for the detection of trace organic contaminants in the environment. (C) 2016 Elsevier B.V. All rights reserved.