Issue 19, 2016

The role of halide ions in the anisotropic growth of gold nanoparticles: a microscopic, atomistic perspective

Abstract

We provide a microscopic view of the role of halides in controlling the anisotropic growth of gold nanorods through a combined computational and experimental study. Atomistic molecular dynamics simulations unveil that Br adsorption is not only responsible for surface passivation, but also acts as the driving force for CTAB micelle adsorption and stabilization on the gold surface in a facet-dependent way. The partial replacement of Br by Cl decreases the difference between facets and the surfactant density. Finally, in the CTAC solution, no halides or micellar structures protect the gold surface and further gold reduction should be uniformly possible. Experimentally observed nanoparticle's growth in different CTAB/CTAC mixtures is more uniform and faster as the amount of Cl increases, confirming the picture from the simulations. In addition, the surfactant layer thickness measured on nanorods exposed to CTAB and CTAC quantitatively agrees with the simulation results.

Graphical abstract: The role of halide ions in the anisotropic growth of gold nanoparticles: a microscopic, atomistic perspective

Supplementary files

Article information

Article type
Paper
Submitted
17 Feb 2016
Accepted
08 Apr 2016
First published
08 Apr 2016
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2016,18, 13246-13254

The role of halide ions in the anisotropic growth of gold nanoparticles: a microscopic, atomistic perspective

S. K. Meena, S. Celiksoy, P. Schäfer, A. Henkel, C. Sönnichsen and M. Sulpizi, Phys. Chem. Chem. Phys., 2016, 18, 13246 DOI: 10.1039/C6CP01076H

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