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Shape effects in plasmon resonance of individual colloidal silver nanoparticles

J. Chem. Phys. 116, 6755 (2002); doi:10.1063/1.1462610

Issue Date: 15 April 2002

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J. J. Mock, M. Barbic, D. R. Smith, D. A. Schultz, and S. Schultz
Department of Physics, University of California, San Diego, La Jolla, California 92093-0319
We present a systematic study of the effect of size and shape on the spectral response of individual silver nanoparticles. An experimental method has been developed that begins with the detection and characterization of isolated nanoparticles in the optical far field. The plasmon resonance optical spectrum of many individual nanoparticles are then correlated to their size and shape using high-resolution transmission electron microscopy. We find that specific geometrical shapes give distinct spectral responses. In addition, inducing subtle changes in the particles' morphology by heating causes a shift in the individual particle spectrum and provides a simple means of tuning the spectral response to a desired optical wavelength. Improved colloidal preparation methods could potentially lead to homogeneous populations of identical particle shapes and colors. These multicolor colloids could be used as biological labels, surface enhanced Raman scattering substrates, or near field optical microscopy sources covering the full range of wavelengths in the visible spectrum. ©2002 American Institute of Physics.
History: Received 13 November 2001; accepted 29 January 2002
Permalink: http://link.aip.org/link/?JCPSA6/116/6755/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.46.+w
    Structure of solids and liquids; crystallography Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
  • 78.67.Bf
    Optical properties, condensed-matter spectroscopy and other interactions of radiation and particles with condensed matter Optical properties of nanoscale materials and structures Nanocrystals and nanoparticles
  • 78.40.Kc
    Optical properties, condensed-matter spectroscopy and other interactions of radiation and particles with condensed matter Absorption and reflection spectra: visible and ultraviolet Metals, semimetals, and alloys
  • YEAR: 2002

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (17)
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