Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 7, Pages 2240-2245Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1119301109
Keywords
anisotropic; tunable; small angle X-ray scattering; depletion interaction
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Funding
- Department of Energy Office (DOE) through the Northwestern University Nonequilibrium Energy Research Center [DE-SC0000989]
- National Security Science and Engineering Faculty from the Department of Defense
- National Science Foundation
- National Defense Science and Engineering Graduate Research Fellowships
- Northwestern University
- Office of Basic Energy Sciences, US DOE [DE-AC02-06CH11357]
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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 situ modulation 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.
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