Spiky gold nanoshells: Synthesis and enhanced scattering properties

Brenda L. Sanchez-Gaytan, Pattanawit Swanglap, Thomas J. Lamkin, Robert J Hickey, Zahra Fakhraai, Stephan Link, So Jung Park

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

Gold nanoshells covered with sharp rods called "spiky gold nanoshells" are synthesized by employing a silver-assisted seed-growth method for heterogeneous nanoparticle syntheses at polymer/water interfaces. It is found that silver ions in the growth solution play an important role in forming uniform gold shells as well as regulating the surface morphology. The optical properties of spiky gold nanoshells are investigated by single-particle scattering measurements, single-particle surface-enhanced Raman scattering measurements, and finite-difference time-domain modeling. The scattering intensities from isolated spiky nanoshells are significantly enhanced compared to those of conventional smooth shells. Moreover, due to the abundant hot spots on spiky nanoshells, the SERS signal is readily observed from single spiky shells with a very small intensity variation (35%), whereas there is no detectable signal from isolated smooth shells. These results demonstrate that our synthetic method provides a straightforward way to organize metal nanoparticles into well-defined assemblies with enhanced scattering properties.

Original languageEnglish (US)
Pages (from-to)10318-10324
Number of pages7
JournalJournal of Physical Chemistry C
Volume116
Issue number18
DOIs
StatePublished - May 10 2012

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    Sanchez-Gaytan, B. L., Swanglap, P., Lamkin, T. J., Hickey, R. J., Fakhraai, Z., Link, S., & Park, S. J. (2012). Spiky gold nanoshells: Synthesis and enhanced scattering properties. Journal of Physical Chemistry C, 116(18), 10318-10324. https://doi.org/10.1021/jp300009b