Open AccessTwo-color surface plasmon resonance nanosizer for gold nanoparticles
Author(s) -
Quaid Zaman,
J. Caetano de Souza,
Omar Pandoli,
Jefferson S. Costa,
Victor Dmitriev,
D. Fulvio,
Marco Cremona,
Ricardo Q. Aucélio,
Giselle N. Fontes,
Tommaso Del Rosso
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.003200
Subject(s) - surface plasmon resonance , materials science , nanoparticle , colloidal gold , surface plasmon , dynamic light scattering , optics , spectroscopy , localized surface plasmon , light scattering , plasmon , nanotechnology , scattering , optoelectronics , physics , quantum mechanics
We study the potentialities of a two-color Surface Plasmon Resonance (SPR) spectroscopy nanosizer by monitoring the assembling of a colloidal dispersion of citrate stabilized gold nanoparticles (AuNPs) on SiO 2 surface. When the AuNPs/water composite's optical density layer is negligible and the electron mean-free path limitation is taken into account in the AuNPs' dielectric constant;s formulation, the surface density σ of the nanoparticle array and the statistical mean size <r> of the nanoparticles can be straightly determined by using two-color SPR spectroscopy in the context of Maxwell's Garnett theory. The optical method, demonstrated experimentally for AuNPs with a nominal mean diameter of 15 nm, can, theoretically, be extended to bigger nanoparticles, based on a simple scaling relation between the extinction cross section of the single nanoparticle σ ext and the surface density σ. The experimental results, comparable to those obtained by AFM, transmission electron microscopy and dynamic light scattering technique, establish a novel insight on the SPR spectroscopy's potential to accurately characterize nanomaterials.