Structure and Growth of Hexagonal Boron Nitride on Ir(111)

Using the X-ray standing wave method, scanning tunneling microscopy, low energy electron diffraction, and density functional theory, we precisely determine the lateral and vertical structure of hexagonal boron nitride on Ir(111). The moiré superstructure leads to a periodic arrangement of strongly...

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Vydáno v:ACS nano Ročník 10; číslo 12; s. 11012 - 11026
Hlavní autoři: Farwick zum Hagen, Ferdinand H, Zimmermann, Domenik M, Silva, Caio C, Schlueter, Christoph, Atodiresei, Nicolae, Jolie, Wouter, Martínez-Galera, Antonio J, Dombrowski, Daniela, Schröder, Ulrike A, Will, Moritz, Lazić, Predrag, Caciuc, Vasile, Blügel, Stefan, Lee, Tien-Lin, Michely, Thomas, Busse, Carsten
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States American Chemical Society 27.12.2016
Témata:
epitaxial growth
X-ray standing waves
hexagonal boron nitride
Ir
moiré
scanning tunneling microscopy
graphene
moiré
ISSN:1936-0851, 1936-086X
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Shrnutí:Using the X-ray standing wave method, scanning tunneling microscopy, low energy electron diffraction, and density functional theory, we precisely determine the lateral and vertical structure of hexagonal boron nitride on Ir(111). The moiré superstructure leads to a periodic arrangement of strongly chemisorbed valleys in an otherwise rather flat, weakly physisorbed plane. The best commensurate approximation of the moiré unit cell is (12 × 12) boron nitride cells resting on (11 × 11) substrate cells, which is at variance with several earlier studies. We uncover the existence of two fundamentally different mechanisms of layer formation for hexagonal boron nitride, namely, nucleation and growth as opposed to network formation without nucleation. The different pathways are linked to different distributions of rotational domains, and the latter enables selection of a single orientation only.
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ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.6b05819