Assembly of reconfigurable one-dimensional colloidal superlattices due to a synergy of fundamental nanoscale forces

Kaylie L. Young, Matthew R. Jones, Jian Zhang, Robert J. Macfarlane, Raul Esquivel-Sirvent, Rikkert J. Nap, Jinsong Wu, George C. Schatz, Byeongdu Lee, Chad A. Mirkin

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

We report that triangular gold nanoprisms in the presence of attractive depletion forces and repulsive electrostatic forces assemble into equilibrium one-dimensional lamellar crystals in solution with interparticle spacings greater than four times the thickness of the nanoprisms. Experimental and theoretical studies reveal that the anomalously large d spacings of the lamellar superlattices are due to a balance between depletion and electrostatic interactions, both of which arise from the surfactant cetyltrimethylammonium bromide. The effects of surfactant concentration, temperature, ionic strength of the solution, and prism edge length on the lattice parameters have been investigated and provide a variety of tools for in situmodulation of these colloidal superstructures. Additionally,we demonstrate a purification procedure based on our observations that can be used to efficiently separate triangular nanoprisms from spherical nanoparticles formed concomitantly during their synthesis.

Original languageEnglish
Pages (from-to)2240-2245
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume109
Issue number7
DOIs
Publication statusPublished - Feb 14 2012

Keywords

  • Anisotropic
  • Depletion interaction
  • Small angle X-ray scattering
  • Tunable

ASJC Scopus subject areas

  • General

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