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Long Vertical Distance Bonding of the Hexagonal Boron Nitride Monolayer on the Cu(111) Surface

DOI: 10.1021/acs.jpcc.7b06107 DOI Help

Authors: Christine Brülke (Institut für Physikalische und Theoretische Chemie der Universität Bonn) , Timo Heepenstrick (Institut für Physikalische und Theoretische Chemie der Universität Bonn) , Niklas Humberg (Institut für Physikalische und Theoretische Chemie der Universität Bonn) , Ina Krieger (Institut für Physikalische und Theoretische Chemie der Universität Bonn) , Moritz Sokolowski (Institut für Physikalische und Theoretische Chemie der Universität Bonn) , Simon Weiss (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA)) , Stefan Tautz (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA)) , Serguei Soubatch (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: September 2017
Diamond Proposal Number(s): 11752

Abstract: The hexagonal boron nitride (hBN) monolayer on the Cu(111) surface has recently been considered an example of an extremely weak hBN/metal interaction, as indicated, e.g., from the presence of an only electronic Moiré-like superstructure that was observed in scanning tunneling microscopy images. From these results a large bonding distance of the hBN sheet to the top most Cu layer can be envisaged, but has not been proven so far. We report a structural analysis of the hBN/Cu(111) interface based on high resolution low energy electron diffraction and normal incidence x-ray standing wave experiments. We find that both the boron and the nitrogen atoms are located at very large vertical distances of dB = 3.25 ± 0.02 Å and dN = 3.22 ± 0.03 Å with respect to the nominal position of the topmost Cu(111) layer. Significant vertical buckling and lateral distortions of the hBN layer can be excluded. These results demonstrate that the hBN monolayer on the Cu(111) surface is indeed well described by a rigid and geometrically well separated sheet.

Subject Areas: Chemistry


Instruments: I09-Surface and Interface Structural Analysis