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Tuning the Optical Properties of Large Gold Nanoparticle Arrays

Published online by Cambridge University Press:  21 March 2011

Beomseok Kim ,
Steven L. Tripp  and
Alexander Wei
Beomseok Kim
Affiliation:
Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, (alexwei@purdue.edu)
Steven L. Tripp
Affiliation:
Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, (alexwei@purdue.edu)
Alexander Wei
Affiliation:
Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, (alexwei@purdue.edu)
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Abstract

Gold nanoparticles in the mid-nanometer size regime can undergo self-organization into densely packed monoparticulate films at the air-water interface under appropriate passivation conditions. Films could be transferred onto hydrophilic Formvar-coated Cu grids by horizontal (Langmuir-Schaefer) deposition or by vertical retraction of immersed substrates. The latter method produced monoparticulate films with variable extinction and reflectance properties. Transmission electron microscopy revealed hexagonally close-packed arrays on the micron length scale. The extinction bands of these arrays shifted by hundreds of nanometers to near-infrared wavelengths and broadened enormously with increasing periodicity. Large particle arrays also demonstrated extremely high surface-enhanced Raman scattering (SERS), with enhancement factors greater than 107. Signal enhancements could be correlated with increasing periodicity and are in accord with earlier theoretical and experimental investigations involving nanoparticle aggregate structures.

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References

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