Mr. Gregory Wallace Profile

Mr. Gregory Wallace

at Univ of Western Ontario

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PROCEEDINGS ARTICLE | May 2, 2014

Plasmonic nanostructures for enhanced Raman spectroscopy: SERS and TERS of thiolated monolayers

Proc. SPIE. 9126, Nanophotonics V

KEYWORDS: Gold, Lithography, Plasmonics, Nanostructures, Polarization, Particles, Molecules, Surface enhanced Raman spectroscopy, Raman spectroscopy, Nanolithography

Read Abstract

Although discovered 40 years ago, the interest in surface enhanced Raman spectroscopy (SERS) for a variety of applications in the fields of material and biomaterial has been revived over the past decade mostly due to a better control over the fabrication methods of nanoscale metallic structures. Metallic structures prepared by bottom-up or top-down methods can be tailored for a variety of applications in order to benefit from the best conditions for surface enhancement. SERS platforms made by nanosphere lithography are for example very versatile platforms that show a detection limit in the femtomolar range. Although quantitative measurements are difficult to perform in Raman spectroscopy, the plasmon-mediated enhancement by the metallic nanostructures are of great interest to improve the detection of analytes traces at surfaces. The extension of SERS to tip-enhanced Raman spectroscopy (TERS) is also very valuable to improve spatial resolution of Raman measurements and to yield surface signals, thus making TERS spectroscopy a surface specific technique. Herein we review SERS and TERS measurements of a model molecule (nitrothiophenol) adsorbed onto gold surfaces.

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