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Proceedings Paper

SERS-active nanoaggregates observed with near-infrared laser excitation
Author(s): Dustin J. Maxwell; Shuming Nie
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Paper Abstract

Using wide-field illumination, optically active 'hot' particles can be screened from a heterogeneous colloid using a near-IR excitation source. Atomic force microscopy (AFM) correlated with surface-enhanced Raman scattering (SERS) measurements reveal that the majority of these particles are small nanoparticle aggregates. This finding indicates a strong dependence between particle size and Raman enhancement. Furthermore, these 'hot' nanoaggregates display an intermittent on-off emission behavior similar to 'blinking' SERS exhibited at 488 nm and 514 nm laser excitation. This behavior, not observed in bulk SERS studies, can only be examined at the single particle level because of variations in particle size, shape, and surface defects. Further examination at the single particle level using a near-IR excitation source could led to new insights regarding the fundamental nature of 'hot' particles as well as the SERS mechanism.

Paper Details

Date Published: 18 June 2001
PDF: 8 pages
Proc. SPIE 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications, (18 June 2001); doi: 10.1117/12.430761
Show Author Affiliations
Dustin J. Maxwell, Indiana Univ. (United States)
Shuming Nie, Indiana Univ. (United States)

Published in SPIE Proceedings Vol. 4258:
Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications
Catherine J. Murphy, Editor(s)

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