Electrostatic aggregation and formation of core-shell suprastructures in binary mixtures of charged metal nanoparticles

Alexander M. Kalsin, Anatoliy O. Pinchuk, Stoyan K. Smoukov, Maciej Paszewski, George C. Schatz, Bartosz A. Grzybowski

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

Electrostatic aggregation of oppositely charged silver and gold nanoparticles leads to the formation of core-shell clusters in which the shell is formed by the nanoparticles, which are in excess. Arguments based on Debye screening of interactions between like-charged particles help explain why these clusters are stable despite possessing net electric charge. The core-shell aggregates exhibit unusual optical properties with the resonance absorption of the shell particles enhanced by the particles in the core and that of the core suppressed by the shell. Experimental UV-vis absorption spectra are faithfully reproduced by Mie theory. The modeling allows for estimation of the numbers of particles forming the shell and of the shell's effective thickness. These theoretical predictions are substantiated by experiments using nanoparticles covered with different combinations of charged groups and performed at different values of pH.

Original languageEnglish
Pages (from-to)1896-1903
Number of pages8
JournalNano letters
Volume6
Issue number9
DOIs
Publication statusPublished - Sep 1 2006

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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