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Michael G. Constantinides, Heinrich M. Jaeger, Xuefa Li, Jin Wang, Xiao-Min Lin
The formation and characterization of three-dimensional gold nanocrystal superlattices
Keywords: Nanocrystals, Nanoparticles, Self-Assembly, GISAXS, Supercrystals
Highly-ordered, three-dimensional superlattices were self-assembled from dodecanethiol-ligated gold nanocrystals using a simple drop-drying technique. The superlattices had the shape of truncated pyramids (frustums) and reached lateral dimensions of several micrometers. The formation and thermal stability were studied by grazing-incidence small-angle x-ray scattering. We found that the superlattice frustums adopt a hcp packing structure. When annealed above 50 °C in vacuum, the lattices started to disorder and the average lattice spacing was observed to decrease. This could be associated with the onset of ligand melting transition as well as the continuous desorption of ligand in vacuum.
Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0044-2968
Volume: 222, 11/2007
Pages: 595 - 600