当前位置: X-MOL 学术J. Raman Spectrosc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Nanopipette‐based electrochemical SERS platforms: Using electrodeposition to produce versatile and adaptable plasmonic substrates
Journal of Raman Spectroscopy ( IF 2.5 ) Pub Date : 2020-08-24 , DOI: 10.1002/jrs.5974
Vitor Brasiliense 1 , Ji Eun Park 1 , Zhu Chen 1 , Richard P. Van Duyne 1 , George C. Schatz 1
Affiliation  

A method for fabricating localized EC‐SERS probes based on nanopipettes and electrodeposition is described. Gold particles of fractal geometry with excellent SERS performance are produced, reliably and at low cost. By adapting the electrodeposition procedure, nanostructures of different sizes can be obtained, allowing the SERS platform to be tailored to many experimental configurations. In particular, by producing unique SERS platforms of dimensions comparable to the laser spot, quantitative comparison with electrochemical current is possible. By analyzing hundreds of samples, we thoroughly characterize the resulting geometry of the structures and their ability to enhance Raman signal, providing guidelines for the fabrication of optimized platforms. Control over the probes' surface potential also allows convenient modulation of surface‐analyte affinity and enable chemically unstable materials, such as Cu, to be reliably used. These are demonstrated by showing that Cu particles exposed to air can be easily re‐reduced, with no detriment in SERS performance.

中文翻译:

基于纳米移液器的电化学SERS平台:使用电沉积来生产通用且适应性强的等离子基板

描述了一种基于纳米移液管和电沉积的局部EC-SERS探针的制造方法。分形几何形状的金颗粒具有出色的SERS性能,可可靠且低成本地生产。通过调整电沉积程序,可以获得不同尺寸的纳米结构,从而使SERS平台适合许多实验配置。特别是,通过生产尺寸与激光点相当的独特SERS平台,可以与电化学电流进行定量比较。通过分析数百个样本,我们彻底表征了结构的最终几何形状及其增强拉曼信号的能力,从而为优化平台的制造提供了指导。控制探针的 表面电势还可以方便地调节表面分析物的亲和力,并能够可靠地使用化学不稳定的材料(例如Cu)。通过证明可以很容易地减少暴露在空气中的铜颗粒,而不会损害SERS性能,证明了这些。
更新日期:2020-08-24
down
wechat
bug