Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.182
Publication date: 6th July 2018
Nanocrystal (NC) solids are commonly prepared from non-polar organic suspensions, with preservation of the original capping. On the other hand, NC superstructures with a direct crystalline connection between the NCs have been reported too. Here, we present large-scale uniform superstructures of attached PbSe NCs with a silicene-type honeycomb geometry, resulting from solvent evaporation under nearly reversible conditions. Those superstructures were prepared by self-assembly of the nanocrystals on a liquid substrate. The nanocrystals are subsequently oriented attached to form a superstructure with preferred geometry. Besides the hoenycomb lattice, we also prepared multilayered silicene honeycomb structures by using larger amounts of PbSe NCs. Using HAADF-STEM tomography we show that the bilayer and multilayered silicene structures of attached PbSe nanocrystals form slices of the simple cubic superstructure. We describe the disorder in the silicene lattices in terms of the nanocrystals position and their atomic alignment. The silicene honeycomb sheets are large enough to be used in transistors and opto-electronic devices.
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