peer journals

Au nanocrystal superlattices: nanocrystallinity, vicinal surfaces, and growth processes

D.M. Smilgies,Ruipeng Liand M. P. Pileni Nanoscale, 2018, DOI: 10.1039/C8NR04606A

Vicinal Au supracrystal surfaces were prepared  from Ausinglesingle domain nanocrystals (NCs) whereas by replacing Ausingleby their polycrystalline counterparts common low-energy supracrystal surfaces are produced.  By analogy to atomic crystalline surfaces, we propose a mechanism to explain formation of such unexpected supracrystal vicinal surfaces, composed of only AusingleNCs are non-compact (bctstructure) with coherent alignment of the atomic planes oriented along the [111] superlattice axis and a slight tilt configuration  (8.1°) of NCs.  In presence of Co() NCs, these Ausinglesupracrystals loose both the slightly tilted configuration of NCs and their orientational order leading to a superlattice transition from bctto fcc. In contrast, supracrystals of AupolyNCs are unsensitive to the presence of Co() NCs. These intriguing structural changes obtained with Ausinglecompared to Aupolysupracrystals in absence and presence of Co() NCs could explain the formation of vicinal surfaces. Note, the solvent used to disperse the nanocrystals plays a key parameter in the formation of supracrystal vicinal surfaces. Here a new analogy between supracrystals and atomic crystals is presented.

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