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Wavelength-scanned surface-enhanced Raman excitation spectroscopy.
J Phys Chem B. 2005 Jun 09; 109(22):11279-85.JP

Abstract

A detailed wavelength-scanned surface-enhanced Raman excitation spectroscopy (WS SERES) study of benzenethiol adsorbed on Ag nanoparticle arrays, fabricated by nanosphere lithography (NSL), is presented. These NSL-derived Ag nanoparticle array surfaces are both structurally well-characterized and extremely uniform in size. The WS SERES spectra are correlated, both spatially and spectrally, with the corresponding localized surface plasmon resonance (LSPR) spectra of the nanoparticle arrays. The surface-enhanced Raman scattering (SERS) spectra were measured in two excitation wavelength ranges: (1) 425-505 nm, and (2) 610-800 nm, as well as with the 532-nm line from a solid-state diode-pumped laser. The WS SERES spectra have line shapes similar to those of the LSPR spectra. The maximum SERS enhancement factor is shown to occur for excitation wavelengths that are blue-shifted with respect to the LSPR lambda(max) of adsorbate-covered nanoparticle arrays. Three vibrational modes of benzenethiol (1575, 1081, and 1009 cm(-1)) are studied simultaneously on one substrate, and it is demonstrated that the smaller Raman shifted peak shows a maximum enhancement closer to the LSPR lambda(max) than that of a larger Raman shifted peak. This is in agreement with the predictions of the electromagnetic (EM) enhancement mechanism of SERS. Enhancement factors of up to approximately 10(8) are achieved, which is also in good agreement with our previous SERES studies.

Authors+Show Affiliations

Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

16852377

Citation

McFarland, Adam D., et al. "Wavelength-scanned Surface-enhanced Raman Excitation Spectroscopy." The Journal of Physical Chemistry. B, vol. 109, no. 22, 2005, pp. 11279-85.
McFarland AD, Young MA, Dieringer JA, et al. Wavelength-scanned surface-enhanced Raman excitation spectroscopy. J Phys Chem B. 2005;109(22):11279-85.
McFarland, A. D., Young, M. A., Dieringer, J. A., & Van Duyne, R. P. (2005). Wavelength-scanned surface-enhanced Raman excitation spectroscopy. The Journal of Physical Chemistry. B, 109(22), 11279-85.
McFarland AD, et al. Wavelength-scanned Surface-enhanced Raman Excitation Spectroscopy. J Phys Chem B. 2005 Jun 9;109(22):11279-85. PubMed PMID: 16852377.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Wavelength-scanned surface-enhanced Raman excitation spectroscopy. AU - McFarland,Adam D, AU - Young,Matthew A, AU - Dieringer,Jon A, AU - Van Duyne,Richard P, PY - 2006/7/21/pubmed PY - 2007/6/8/medline PY - 2006/7/21/entrez SP - 11279 EP - 85 JF - The journal of physical chemistry. B JO - J Phys Chem B VL - 109 IS - 22 N2 - A detailed wavelength-scanned surface-enhanced Raman excitation spectroscopy (WS SERES) study of benzenethiol adsorbed on Ag nanoparticle arrays, fabricated by nanosphere lithography (NSL), is presented. These NSL-derived Ag nanoparticle array surfaces are both structurally well-characterized and extremely uniform in size. The WS SERES spectra are correlated, both spatially and spectrally, with the corresponding localized surface plasmon resonance (LSPR) spectra of the nanoparticle arrays. The surface-enhanced Raman scattering (SERS) spectra were measured in two excitation wavelength ranges: (1) 425-505 nm, and (2) 610-800 nm, as well as with the 532-nm line from a solid-state diode-pumped laser. The WS SERES spectra have line shapes similar to those of the LSPR spectra. The maximum SERS enhancement factor is shown to occur for excitation wavelengths that are blue-shifted with respect to the LSPR lambda(max) of adsorbate-covered nanoparticle arrays. Three vibrational modes of benzenethiol (1575, 1081, and 1009 cm(-1)) are studied simultaneously on one substrate, and it is demonstrated that the smaller Raman shifted peak shows a maximum enhancement closer to the LSPR lambda(max) than that of a larger Raman shifted peak. This is in agreement with the predictions of the electromagnetic (EM) enhancement mechanism of SERS. Enhancement factors of up to approximately 10(8) are achieved, which is also in good agreement with our previous SERES studies. SN - 1520-6106 UR - https://www.unboundmedicine.com/medline/citation/16852377/Wavelength_scanned_surface_enhanced_Raman_excitation_spectroscopy_ L2 - https://doi.org/10.1021/jp050508u DB - PRIME DP - Unbound Medicine ER -