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Orientationally Ordered Silicon Nanocrystal Cuboctahedra in Superlattices

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posted on 2016-11-16, 00:00 authored by Yixuan Yu, Xiaotang Lu, Adrien Guillaussier, Vikas Reddy Voggu, William Pineros, Maria de la Mata, Jordi Arbiol, Detlef-M. Smilgies, Thomas M. Truskett, Brian A. Korgel
Uniform silicon nanocrystals were synthesized with cuboctahedral shape and passivated with 1-dodecene capping ligands. Transmission electron microscopy, electron diffraction, and grazing incidence wide-angle and small-angle X-ray scattering show that these soft cuboctahedra assemble into face-centered cubic superlattices with orientational order. The preferred nanocrystal orientation was found to depend on the orientation of the superlattices on the substrate, indicating that the interactions with the substrate and assembly kinetics can influence the orientation of faceted nanocrystals in superlattices.