Radio frequency absorption in gold nanoparticle suspensions: A phenomenological study

E. Sassaroli, K. C.P. Li, B. E. O'Neill

Research output: Contribution to journalArticlepeer-review

Abstract

Detailed calculations of the attenuation of low-frequency electromagnetic fields and dielectric losses by a dilute suspension of gold colloidal nanoparticles are reported. The attenuation produced by the particles suspended in an aqueous medium of low electrolyte concentration was found to be modest as compared with the attenuation in the medium itself. The same result is obtained using the MaxwellWagner effective medium theory with the effect of the counter-ion relaxation also taken into account. The attenuation associated with the motion of the colloidal particles under the effect of the electric field has also been evaluated and found significant under certain conditions. This study points towards the importance of the ionic contribution and the motion of the charged nanoparticles as key factors for the increased absorption observed at radio frequencies in dilute suspensions of gold colloidal nanoparticles.

Original languageEnglish (US)
Article number075303
JournalJournal of Physics D: Applied Physics
Volume45
Issue number7
DOIs
StatePublished - Feb 22 2012
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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