Three-layer substrates for surface-enhanced Raman scattering: Preparation and preliminary evaluation

Shawn P. Mulvaney, Lin He, Michael J. Natan, Christine Dolan Keating

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

In surface-enhanced Raman scattering (SERS), the magnitude of enhancement is highly dependent on the nanometer-scale morphological and optical properties of the substrate employed. This paper reports the development of an improved SERS-active substrate that is based on a combination of nanoparticle assembly and evaporated thin films. Highly enhancing, three-layer SERS-active substrates were constructed by evaporation of an Ag film over an Ag-clad colloidal Au submonolayer; the distinguishing feature of the three-layer substrate is the formation of evaporated Ag islands between the surface-bound colloidal particles. UV-visible absorption spectroscopy, atomic force microscopy and field emission scanning electron microscopy were used to characterize the substrate morphology. The thickness of the evaporated layer was varied in order to determine the optimal substrate architecture. The estimated enhancement factor for the optimized substrate architecture was 7 × 104. Furthermore, better than 15% reproducibility in the Raman spectra for adsorbed analytes was observed from spot to spot on a given substrate, and also from substrate to substrate. Finally, a sub-picogram detection limit was demonstrated with the environmental pollutant 1,3,5-triazine.

Original languageEnglish (US)
Pages (from-to)163-171
Number of pages9
JournalJournal of Raman Spectroscopy
Volume34
Issue number2
DOIs
StatePublished - Feb 1 2003

Fingerprint

Raman scattering
Substrates
Environmental Pollutants
Triazines
Absorption spectroscopy
Field emission
Atomic force microscopy
Evaporation
Optical properties
Nanoparticles
Thin films
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Spectroscopy

Cite this

@article{930a64cf011246dd96eedecd2d07f5c7,
title = "Three-layer substrates for surface-enhanced Raman scattering: Preparation and preliminary evaluation",
abstract = "In surface-enhanced Raman scattering (SERS), the magnitude of enhancement is highly dependent on the nanometer-scale morphological and optical properties of the substrate employed. This paper reports the development of an improved SERS-active substrate that is based on a combination of nanoparticle assembly and evaporated thin films. Highly enhancing, three-layer SERS-active substrates were constructed by evaporation of an Ag film over an Ag-clad colloidal Au submonolayer; the distinguishing feature of the three-layer substrate is the formation of evaporated Ag islands between the surface-bound colloidal particles. UV-visible absorption spectroscopy, atomic force microscopy and field emission scanning electron microscopy were used to characterize the substrate morphology. The thickness of the evaporated layer was varied in order to determine the optimal substrate architecture. The estimated enhancement factor for the optimized substrate architecture was 7 × 104. Furthermore, better than 15{\%} reproducibility in the Raman spectra for adsorbed analytes was observed from spot to spot on a given substrate, and also from substrate to substrate. Finally, a sub-picogram detection limit was demonstrated with the environmental pollutant 1,3,5-triazine.",
author = "Mulvaney, {Shawn P.} and Lin He and Natan, {Michael J.} and Keating, {Christine Dolan}",
year = "2003",
month = "2",
day = "1",
doi = "10.1002/jrs.972",
language = "English (US)",
volume = "34",
pages = "163--171",
journal = "Journal of Raman Spectroscopy",
issn = "0377-0486",
publisher = "John Wiley and Sons Ltd",
number = "2",

}

Three-layer substrates for surface-enhanced Raman scattering : Preparation and preliminary evaluation. / Mulvaney, Shawn P.; He, Lin; Natan, Michael J.; Keating, Christine Dolan.

In: Journal of Raman Spectroscopy, Vol. 34, No. 2, 01.02.2003, p. 163-171.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Three-layer substrates for surface-enhanced Raman scattering

T2 - Preparation and preliminary evaluation

AU - Mulvaney, Shawn P.

AU - He, Lin

AU - Natan, Michael J.

AU - Keating, Christine Dolan

PY - 2003/2/1

Y1 - 2003/2/1

N2 - In surface-enhanced Raman scattering (SERS), the magnitude of enhancement is highly dependent on the nanometer-scale morphological and optical properties of the substrate employed. This paper reports the development of an improved SERS-active substrate that is based on a combination of nanoparticle assembly and evaporated thin films. Highly enhancing, three-layer SERS-active substrates were constructed by evaporation of an Ag film over an Ag-clad colloidal Au submonolayer; the distinguishing feature of the three-layer substrate is the formation of evaporated Ag islands between the surface-bound colloidal particles. UV-visible absorption spectroscopy, atomic force microscopy and field emission scanning electron microscopy were used to characterize the substrate morphology. The thickness of the evaporated layer was varied in order to determine the optimal substrate architecture. The estimated enhancement factor for the optimized substrate architecture was 7 × 104. Furthermore, better than 15% reproducibility in the Raman spectra for adsorbed analytes was observed from spot to spot on a given substrate, and also from substrate to substrate. Finally, a sub-picogram detection limit was demonstrated with the environmental pollutant 1,3,5-triazine.

AB - In surface-enhanced Raman scattering (SERS), the magnitude of enhancement is highly dependent on the nanometer-scale morphological and optical properties of the substrate employed. This paper reports the development of an improved SERS-active substrate that is based on a combination of nanoparticle assembly and evaporated thin films. Highly enhancing, three-layer SERS-active substrates were constructed by evaporation of an Ag film over an Ag-clad colloidal Au submonolayer; the distinguishing feature of the three-layer substrate is the formation of evaporated Ag islands between the surface-bound colloidal particles. UV-visible absorption spectroscopy, atomic force microscopy and field emission scanning electron microscopy were used to characterize the substrate morphology. The thickness of the evaporated layer was varied in order to determine the optimal substrate architecture. The estimated enhancement factor for the optimized substrate architecture was 7 × 104. Furthermore, better than 15% reproducibility in the Raman spectra for adsorbed analytes was observed from spot to spot on a given substrate, and also from substrate to substrate. Finally, a sub-picogram detection limit was demonstrated with the environmental pollutant 1,3,5-triazine.

UR - http://www.scopus.com/inward/record.url?scp=0037324939&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037324939&partnerID=8YFLogxK

U2 - 10.1002/jrs.972

DO - 10.1002/jrs.972

M3 - Article

AN - SCOPUS:0037324939

VL - 34

SP - 163

EP - 171

JO - Journal of Raman Spectroscopy

JF - Journal of Raman Spectroscopy

SN - 0377-0486

IS - 2

ER -