Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy

Daniel R Ward; Nathaniel K Grady; Carly S Levin; Naomi J. Halas; Yanpeng Wu; Peter Nordlander; Douglas Natelson

doi:10.1021/nl070625w

Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy

Daniel R Ward, Nathaniel K Grady, Carly S Levin, Naomi J. Halas, Yanpeng Wu, Peter Nordlander, Douglas Natelson

Research output: Contribution to journal › Article › peer-review

293 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	1396-400
Number of pages	5
Journal	Nano Letters
Volume	7
Issue number	5
DOIs	https://doi.org/10.1021/nl070625w
State	Published - May 2007

Keywords

Nanotechnology
Spectrum Analysis, Raman
Surface Properties
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

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title = "Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy",

abstract = "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.",

keywords = "Nanotechnology, Spectrum Analysis, Raman, Surface Properties, Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.",

author = "Ward, {Daniel R} and Grady, {Nathaniel K} and Levin, {Carly S} and Halas, {Naomi J.} and Yanpeng Wu and Peter Nordlander and Douglas Natelson",

year = "2007",

month = may,

doi = "10.1021/nl070625w",

language = "English (US)",

volume = "7",

pages = "1396--400",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "5",

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TY - JOUR

T1 - Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy

AU - Ward, Daniel R

AU - Grady, Nathaniel K

AU - Levin, Carly S

AU - Halas, Naomi J.

AU - Wu, Yanpeng

AU - Nordlander, Peter

AU - Natelson, Douglas

PY - 2007/5

Y1 - 2007/5

N2 - 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.

AB - 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.

KW - Nanotechnology

KW - Spectrum Analysis, Raman

KW - Surface Properties

KW - Journal Article

KW - Research Support, N.I.H., Extramural

KW - Research Support, Non-U.S. Gov't

KW - Research Support, U.S. Gov't, Non-P.H.S.

U2 - 10.1021/nl070625w

DO - 10.1021/nl070625w

M3 - Article

C2 - 17430009

SN - 1530-6984

VL - 7

SP - 1396

EP - 1400

JO - Nano Letters

JF - Nano Letters

IS - 5

ER -

Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy

Abstract

Keywords

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