期刊
SCIENCE
卷 344, 期 6190, 页码 1377-1380出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1252642
关键词
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资金
- Foundation of Fundamental Research on Matter (FOM), Dutch Research Council (NWO)
- European Research Council (ERC) [24691-COUNTATOMS, 335078-COLOURATOM]
- European Union under the Seventh Framework Program [Integrated Infrastructure Initiative 262348 European Soft Matter Infrastructure (ESMI)]
- Flemish Fund for Scientific Research (FWO Vlaanderen) through a Ph.D. research grant
Oriented attachment of synthetic semiconductor nanocrystals is emerging as a route for obtaining new semiconductors that can have Dirac-type electronic bands such as graphene, but also strong spin-orbit coupling. The two-dimensional (2D) assembly geometry will require both atomic coherence and long-range periodicity of the superlattices. We show how the interfacial self-assembly and oriented attachment of nanocrystals results in 2D metal chalcogenide semiconductors with a honeycomb superlattice. We present an extensive atomic and nanoscale characterization of these systems using direct imaging and wave scattering methods. The honeycomb superlattices are atomically coherent and have an octahedral symmetry that is buckled; the nanocrystals occupy two parallel planes. Considerable necking and large-scale atomic motion occurred during the attachment process.
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