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Growth and electronic structure of 2D hexagonal nanosheets on a corrugated rectangular substrate

Research output: Contribution to journalArticle

  • Simona Achilli
  • Emanuele Cavaliere
  • Than Hai Nguyen
  • Mattia Cattelan
  • Stefano Agnoli
Original languageEnglish
Article number485201
Number of pages11
JournalNanotechnology
Volume29
Issue number48
Early online date1 Oct 2018
DOIs
DateAccepted/In press - 7 Sep 2018
DateE-pub ahead of print - 1 Oct 2018
DatePublished (current) - 30 Nov 2018

Abstract

Graphene and h-BN are grown by chemical vapor deposition in ultra high vacuum conditions on the Pt(110) surface. Scanning tunneling microscopy measurements and low-energy electron diffraction data indicate that graphene forms a variety of differently oriented incommensurate domains although with a strong preference to align its direction with the direction of Pt. Meanwhile, h-BN exhibits a c(8 × 10) commensurate superstructure, which presents a high level of defectivity that implies local variation of the periodicity (i.e. mixed c(8 × 10) and c(8 × 12) patches) and the introduction of local defects. The combination of advanced photoemission spectroscopy data (angle-resolved photoemission spectroscopy from the valence band) and ab initio calculations indicates that both 2D materials interact weakly with the substrate: graphene exhibits neutral doping and is morphologically flat, even if it nucleates on the relatively highly corrugated rectangular (110) surface. In the case of h-BN, the interaction is slightly stronger and is characterized by a small electron transfer from surface Pt atoms to nitrogen atoms. The (110) termination of Pt is therefore a quite interesting surface for the growth of 2D materials because given its low symmetry, it may favor the growth of selectively oriented domains but does not affect their pristine electronic properties.

    Research areas

  • h-BN, LEE, STM, PES, DFT, Pt(110), graphene

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via IOP at http://iopscience.iop.org/article/10.1088/1361-6528/aadfd2/meta . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

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