Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.194
Publication date: 6th July 2018
It has been reported that drop casting of a suspension of PbX (X=S, Se, Te) nanocrystals on an ethylene glycol liquid substrate results in the formation of atomically coherent 2-D sheets of a nanocrystal monolayer in thickness. The Klinke group reported the formation of PbS NC sheets. We reported PbSe (S, Te) sheets with a superimposed honeycomb and square geometry.
I will present here our recent progress in this field which is based on extremely slow solvent evaporation under a constant (nearly saturated) solvent vapor phase. We present silicene type honeycomb sheets with lateral dimensions in the 100 micrometer range. We also prepared silicene structures that extend in the vertical dimension over several unit cells. Finally, we studied the "atomic-like" and orientation defects in these systems.
The mechanism of this remarkable self-assembly process was studied by in-situ GISAX and GIWAX and by molecular dynamic simulations.
Low-Dimensional Semiconductor Superlattices Formed by Geometric Control over Nanocrystal Attachment." Nano Letters 13(6): 2317-2323.
Long-range orientation and atomic attachment of nanocrystals in 2D honeycomb superlattices." Science 344(6190): 1377-1380.
In situ study of the formation mechanism of two-dimensional superlattices from PbSe nanocrystals." Nature Materials 15(12): 1248-1254.
Mono- and multilayer silicene-type honeycomb lattices by oriented attachment of PbSe nanocrystals: synthesis, structural characterization, and analysis of the disorder.
Submitted
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