Assembly of gold nanowires by sedimentation from suspension: Experiments and simulation

Derek A. Triplett, Lisa M. Quimby, Benjamin D. Smith, Darimar Hernández Rodríguez, Sarah K. St. Angelo, Pedro González, Christine D. Keating, Kristen A. Fichthorn

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Abstract

We investigated the ordering of gold nanowires that settled from an aqueous suspension onto a glass substrate due to gravity. The nanowires, ca. 300 nm in cross-sectional diameter and ca. 2, 4, or 7 μm in length, were coated with 2-mercaptoethanesulfonic acid to provide electrostatic repulsion and prevent aggregation. The layer of nanowires in direct contact with the substrate was examined from below using optical microscopy and found to exhibit smectic-like ordering. The extent of smectic ordering depended on nanowire length, with the shortest (2 μm) nanowires exhibiting the best ordering. To understand the assembly in this system, we used canonical Monte Carlo simulations to model the two-dimensional ordering of the nanowires on a substrate. We accounted for van der Waals and electrostatic interactions between the nanowires. The simulations reproduced the experimental trends and showed that roughness at the ends of the nanowires, which locally increased electrostatic repulsion, is critical to correctly predicting the experimentally observed smectic ordering.

Original languageEnglish (US)
Pages (from-to)7346-7355
Number of pages10
JournalJournal of Physical Chemistry C
Volume114
Issue number16
DOIs
StatePublished - Apr 29 2010

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Triplett, D. A., Quimby, L. M., Smith, B. D., Hernández Rodríguez, D., St. Angelo, S. K., González, P., Keating, C. D., & Fichthorn, K. A. (2010). Assembly of gold nanowires by sedimentation from suspension: Experiments and simulation. Journal of Physical Chemistry C, 114(16), 7346-7355. https://doi.org/10.1021/jp909251v