期刊
ACS PHOTONICS
卷 2, 期 10, 页码 1482-1488出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00369
关键词
gold nanorods; supercrystal; superlattice; method of moments; MLFMA; SERS; surface enhanced Raman scattering; electron tomography
类别
资金
- European Research Council (ERC) [267867, 335078]
- Spanish Ministerio de Economia y Competitividad [MAT2013-46101-R, MAT2014-58201-C2-1-R, MAT2014-58201-C2-2-R]
- European Regional Development Fund (ERDF)
- ERDF
- Galician Regional Government (AtlantTIC) [CN2012/279, CN2012/260]
- Plan I2C
- Extremadura Regional Government [IB13185]
Gold nanorod supercrystals have been widely employed for the detection of relevant bioanalytes with detection limits ranging from nano- to picomolar levels, confirming the promising nature of these structures for biosensing. Even though a relationship between the height of the supercrystal (i.e., the number of stacked nanorod layers) and the enhancement factor has been proposed, no systematic study has been reported. In order to tackle this problem, we prepared gold nanorod supercrystals with varying numbers of stacked layers and analyzed them extensively by atomic force microscopy, electron microscopy and surface enhanced Raman scattering. The experimental results were compared to numerical simulations performed on real-size supercrystals composed of thousands of nanorod building blocks. Analysis of the hot spot distribution in the simulated supercrystals showed the presence of standing waves that were distributed at different depths, depending on the number of layers in each supercrystal. On the basis of these theoretical results, we interpreted the experimental data in terms of analyte penetration into the topmost layer only, which indicates that diffusion to the interior of the supercrystals would be crucial if the complete field enhancement produced by the stacked nanorods is to be exploited. We propose that our conclusions will be of high relevance in the design of next generation plasmonic devices.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据