Effect of solvent refractive index on the surface plasmon resonance nanoparticle optical absorption


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Ertas G. , Suzer S.

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, vol.7, no.12, pp.4333-4338, 2007 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 7 Issue: 12
  • Publication Date: 2007
  • Doi Number: 10.1166/jnn.2007.906
  • Title of Journal : JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
  • Page Numbers: pp.4333-4338
  • Keywords: gold and silver nanoparticles, refractive index, NANOSPHERE LITHOGRAPHY, IMAGING MEASUREMENTS, SILVER NANOPARTICLE, GOLD, SIZE, DEPENDENCE, ARRAYS, CORE

Abstract

Optical properties of plasmon coupled silver and gold nanoparticles were studied as a function of the refractive index of the surrounding medium. Our studies confirmed that the effect of changes in the refractive index of the surrounding medium was more difficult to demonstrate from an experimental point of view, because of the very high susceptibility of nanoparticles to aggregate in aqueous and organic solvents. Whereas the position of the absorption bands of triiodide in these solvents shows a clear dependence on medium's refractive index, the surface plasmon band position of silver and gold nanoparticles do not exhibit the same dependence. This is attributed to a non-negligible interaction of these solvents with nanoparticle surfaces.