Geometrical Parameters Controlling Sensitivity of Nanoshell Plasmon Resonances to Changes in Dielectric Environment

Felicia Tam,† Cristin Moran,‡ and Naomi Halas*‡§
Department of Physics and Astronomy, Department of Chemistry, and Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005
J. Phys. Chem. B, 2004, 108 (45), pp 17290–17294
DOI: 10.1021/jp048499x
Publication Date (Web): October 15, 2004
Copyright © 2004 American Chemical Society
†

 Department of Physics and Astronomy, Rice University.

,
‡

 Department of Chemistry, Rice University.

,
*

 halas@rice.edu.

,
§

 Department of Electrical and Computer Engineering, Rice University.

Abstract

In this study, we investigate the geometrical parameters that control the sensitivity of the plasmon resonance wavelength of a silica−gold nanoshell to changes in its dielectric environment. It was found that the magnitude of the SPR frequency shift upon a change in refractive index of the embedding medium depends primarily on total nanoparticle size and less sensitively on the core/shell ratio. Immobilized nanoshells on a glass substrate showed a 25% decrease in magnitude of the SPR shifts; however, sensitivities as large as Δλ/Δn = 555.4 nm/RIU were obtained for this geometry.

View: Full Text HTML | Hi-Res PDF

Tools

History

  • Published In Issue November 11, 2004
  • Received April 6, 2004
    Revised June 11, 2004

Recommend & Share

Related Content

Other ACS content by these authors: