Long-range orientation and atomic attachment of nanocrystals in 2D honeycomb superlattices

M. P. Boneschanscher, W. H. Evers, J. J. Geuchies, T. Altantzis, B. Goris, F. T. Rabouw, S. A. P. van Rossum, H. S. J. van der Zant, L. D. A. Siebbeles, G. Van Tendeloo, I. Swart, J. Hilhorst, Andrei V. Petukhov, S. Bals, D. Vanmaekelbergh*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)1377-1380
Number of pages4
JournalScience
Volume344
Issue number6190
DOIs
Publication statusPublished - 20 Jun 2014

Keywords

  • ORIENTED ATTACHMENT
  • ELECTRON TOMOGRAPHY
  • CATION-EXCHANGE
  • DIRAC FERMIONS
  • GRAPHENE
  • NANOPARTICLES
  • MICROSCOPY
  • NANORODS
  • GROWTH

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