Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy

被引：291

作者：

Ward, Daniel R.

Grady, Nathaniel K.

Levin, Carly S.

Halas, Naomi J.

Wu, Yanpeng

Nordlander, Peter

Natelson, Douglas

机构：

[1] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[2] Rice Univ, Appl Phys Grad Program, Houston, TX 77005 USA

[3] Rice Univ, Dept Chem, Houston, TX 77005 USA

[4] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[5] Rice Univ, Rice Quantum INst, Houston, TX 77005 USA

来源：

NANO LETTERS | 2007年 / 7卷 / 05期

关键词：

D O I：

10.1021/nl070625w

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Single-molecule detection with chemical specificity is a powerful and much desired tool for biology, chemistry, physics, and sensing technologies. Surface-enhanced spectroscopies enable single-molecule studies, yet reliable substrates of adequate sensitivity are in short supply. We present a simple, scaleable substrate for surface-enhanced Raman spectroscopy (SERS) incorporating nanometer-scale electromigrated gaps between extended electrodes. Molecules in the nanogap active regions exhibit hallmarks of very high Raman sensitivity, including blinking and spectral diffusion. Electrodynamic simulations show plasmonic focusing, giving electromagnetic enhancements approaching those needed for single-molecule SERS.

引用

收藏

页码：1396 / 1400

页数：5

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