Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices

  • Yu Y
  • Goodfellow B
  • Rasch M
 et al. 
  • 27


    Mendeley users who have this article in their library.
  • 12


    Citations of this article.


Dodecanethiol-capped gold (Au) nanocrystal superlattices can undergo a surprisingly diverse series of ordered structure transitions when heated (Goodfellow, B. W.; Rasch, M. R.; Hessel, C. M.; Patel, R. N.; Smilgies, D.-M.; Korgel, B. A. Nano Lett. 2013, 13, 5710-5714). These are the result of highly uniform changes in nanocrystal size, which subsequently force a spontaneous rearrangement of superlattice structure. Here, we show that halide-containing surfactants play an essential role in these transitions. In the absence of any halide-containing surfactant, superlattices of dodecanethiol-capped (1.9-nm-diameter) Au nanocrystals do not change size until reaching about 190-205 °C, at which point the gold cores coalesce. In the presence of halide-containing surfactant, such as tetraoctylphosphonium bromide (TOPB) or tetraoctylammounium bromide (TOAB), the nanocrystals ripen at much lower temperature and superlattices undergo various ordered structure transitions upon heating. Chloride- and iodide-containing surfactants induce similar behavior, destabilizing the Au-thiol bond and reducing the thermal stability of the nanocrystals.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Lynn LooPrinceton University

  • Yixuan Yu

  • Brian W. Goodfellow

  • Michael R. Rasch

  • Christian Bosoy

  • Detlef M. Smilgies

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free