Modeling of electrodynamic interactions between metal nanoparticles aggregated by electrostatic interactions into closely-packed clusters

Anatoliy O. Pinchuk, Alexander M. Kalsin, Bartlomiej Kowalczyk, George C Schatz, Bartosz A. Grzybowski

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

This paper is a theoretical and experimental study of the optical properties of binary aqueous suspensions containing metal nanoparticles (NPs) coated with charged organics. If all nanoparticles bear charges of the same polarity, the NPs do not aggregate, and the solutions are stable. Under these circumstances, optical response of the mixture is a linear combination of the optical responses of the individual components. In contrast, when the NPs are oppositely charged, they aggregate into clusters, whose optical properties cannot be understood without taking into account electrodynamic coupling between the constituent NPs. To model such aggregates, we present two theoretical approaches: (i) an exact analytical model accounting for the granularity of the NPs and (ii) an approximation, in which the aggregates are represented as spherosymmetric core-and-shells. Both models reproduce optical spectra recorded experimentally and give physically reasonable estimates of the aggregates' internal structure and composition.

Original languageEnglish
Pages (from-to)11816-11822
Number of pages7
JournalJournal of Physical Chemistry C
Volume111
Issue number32
DOIs
Publication statusPublished - Aug 16 2007

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Metal nanoparticles
Electrodynamics
Coulomb interactions
electrodynamics
electrostatics
Nanoparticles
nanoparticles
metals
interactions
Optical properties
optical properties
Analytical models
bears
Suspensions
optical spectrum
polarity
Chemical analysis
estimates
approximation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Modeling of electrodynamic interactions between metal nanoparticles aggregated by electrostatic interactions into closely-packed clusters. / Pinchuk, Anatoliy O.; Kalsin, Alexander M.; Kowalczyk, Bartlomiej; Schatz, George C; Grzybowski, Bartosz A.

In: Journal of Physical Chemistry C, Vol. 111, No. 32, 16.08.2007, p. 11816-11822.

Research output: Contribution to journalArticle

Pinchuk, Anatoliy O. ; Kalsin, Alexander M. ; Kowalczyk, Bartlomiej ; Schatz, George C ; Grzybowski, Bartosz A. / Modeling of electrodynamic interactions between metal nanoparticles aggregated by electrostatic interactions into closely-packed clusters. In: Journal of Physical Chemistry C. 2007 ; Vol. 111, No. 32. pp. 11816-11822.
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