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Dynamic Rastering Surface-Enhanced Raman Scattering (SERS) Measurements on Silver Nanorod Substrates

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Abstract:

Surface-enhanced Raman spectra of a thiol-modified biotin derivative on oblique-angle-deposited silver nanorod (AgNR) array substrates were measured using both static and rotating rastering methods. We find that the rotating rastering method has a strong tendency to decrease the point-to-point relative standard deviation (RSD) compared to static measurements as well as decrease the effects of cumulative excitation exposure. The AgNR substrates treated with the modified biotin typically demonstrate intra-substrate RSDs of <10%, with an average RSD of ∼3% when the rastering radius r=1 mm. The quantitative studies on the relationship between rastering radius, sampling area, and rastering frequency show that only the rastering radius appears to have significant effect on the measured RSD. Our results demonstrate that under the proper measurement and sample preparation conditions, the Ag nanorod substrates are very uniform.

Keywords: AGNPS; AGNRS; NANOPARTICLES; OBLIQUE ANGLE DEPOSITION; SERS; SILVER NANOROD ARRAYS; SURFACE-ENHANCED RAMAN SCATTERING; UNIFORM SERS SUBSTRATES

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/11-06264

Affiliations: 1: Department of Biological and Agricultural Engineering, The University of Georgia, Athens, Georgia 30602, USA. justabell@yahoo.com 2: Department of Statistics, The University of Georgia, Athens, Georgia 30602, USA 3: Department of Physics and Astronomy, The University of Georgia, Athens, Georgia 30602, USA

Publication date: July 1, 2011

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