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Issue 19, 2016
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The role of halide ions in the anisotropic growth of gold nanoparticles: a microscopic, atomistic perspective

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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

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Publication details

The article was received on 17 Feb 2016, accepted on 08 Apr 2016 and first published on 08 Apr 2016


Article type: Paper
DOI: 10.1039/C6CP01076H
Citation: Phys. Chem. Chem. Phys., 2016,18, 13246-13254
  • Open access: Creative Commons BY-NC license
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    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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