Thin triangular silver single crystals are obtained by annealing self-ordered 5 nm silver nanocrystals coated with decanethiol at 50 ° C and deposited on highly oriented pyrolitic graphite (HOPG). With the annealing time, the nanocrystals coalesce progressively in the 2D hexagonal arrays and 3D face-centered cubic (fcc) superlattices. By controlling the ordering degree of the nanocrystal assemblies, we observe that the size of the ordered domains tunes the final size of the triangles.
Source : How do self-ordered silver nanocrystals influence their growth into triangular single crystals ? A.I. Henry, A. Courty, N. Goubet and M.P. Pileni J. Phys. Chem. C , 2008, 112, 48-52.