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Surface-Enhanced Infrared Absorption and Raman Scattering of Adsorbate Molecules on Self-assembled Au Nanorods

Published online by Cambridge University Press:  11 March 2011

Li-Lin Tay ,
John Hulse ,
Nelson Rowell ,
Jeff Fraser  and
Ping-Ji Huang
Li-Lin Tay
Affiliation:
National Research Council Canada, Ottawa, ON, Canada K1A 0R6
John Hulse
Affiliation:
National Research Council Canada, Ottawa, ON, Canada K1A 0R6
Nelson Rowell
Affiliation:
National Research Council Canada, Ottawa, ON, Canada K1A 0R6
Jeff Fraser
Affiliation:
National Research Council Canada, Ottawa, ON, Canada K1A 0R6
Ping-Ji Huang
Affiliation:
Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, Taiwan
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Abstract

The localized surface plasmon resonance (LSPR) is a collective oscillation of conduction electrons confined in metal nanostructures and is largely responsible for surface enhanced spectroscopies. Surface enhanced Raman scattering (SERS) is the best known and most widely applied example of such a surface enhanced spectroscopy. Although closely related and complementary to SERS, surface enhanced infrared absorption (SEIRA) spectroscopy requires more careful engineering of the LSPR of metal nanostructures so that the resonance is within the mid-infrared region. In this study, we demonstrate the use of gold nanorods (Au NR) as a suitable substrate capable of sustaining strong SEIRA spectroscopy. Adsorbate saturated Au NR typically exhibit Fano-type resonances in their SEIRA spectra obtained using reflectance FTIR. Such line asymmetry occurs due to the coupling of the relatively sharp molecular vibrations to the broad continuum of the LSPR resonance of the aggregated Au NR.

Keywords

Raman spectroscopyinfrared (IR) spectroscopynanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1294: Symposium M – Resonant Optical Antennas—Sensing and Shaping Materials , 2011 , mrsf10-1294-m10-22
Copyright
Copyright © Materials Research Society 2011

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