Reproducible electrochemical etching of silver probes with a radius of curvature of 20 nm for tip-enhanced Raman applications

被引：17

作者：

Lloyd, J. S. ^{[1
]}

Williams, A. ^{[1
]}

Rickman, R. H. ^{[1
]}

McCowen, A. ^{[2
]}

Dunstan, P. R. ^{[1
]}

机构：

[1] Swansea Univ, Coll Sci, Dept Phys, Swansea SA2 8PP, W Glam, Wales

[2] Swansea Univ, Coll Engn, Swansea SA2 8PP, W Glam, Wales

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 14期

基金：

英国工程与自然科学研究理事会;

关键词：

boundary-elements methods; etching; optimisation; probes; Raman spectroscopy; SCANNING-TUNNELING-MICROSCOPY; SPECTROSCOPY; SURFACE; TERS;

D O I：

10.1063/1.3646106

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The performance of tip-enhanced Raman spectroscopy (TERS) largely depends on probe optimisation. An electrochemical etch using nitric acid and ethanol produces sharp silver probes with radius of curvature between 20 and 60 nm. Optimisation also identified controllable tapers; rough or smooth. Boundary element method simulations comparing the response to 532 nm excitation of silver and gold probes reveal no discernable field enhancement at the gold apex, but strong localised enhancement is observed at the silver apex. The motivation for employing this method of etching silver probes can also be seen in the signal enhancement observed in preliminary TERS data presented. (C) 2011 American Institute of Physics. [doi:10.1063/1.3646106]

引用

页数：3

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