Universität zu Köln

Omambac, Karim M., Petrovic, Marin, Bampoulis, Pantelis ORCID: 0000-0002-2347-5223, Brand, Christian ORCID: 0000-0002-2984-4456, Kriegel, Marko A., Dreher, Pascal ORCID: 0000-0001-8975-1983, Janoschka, David ORCID: 0000-0002-4311-330X, Hagemann, Ulrich, Hartmann, Nils, Valerius, Philipp, Michely, Thomas, Zu Heringdorf, Frank J. Meyer and Horn-von Hoegen, Michael (2021). Segregation-Enhanced Epitaxy of Borophene on Ir(111) by Thermal Decomposition of Borazine. ACS Nano, 15 (4). S. 7421 - 7430. WASHINGTON: AMER CHEMICAL SOC. ISSN 1936-086X

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Abstract

Like other 2D materials, the boron-based borophene exhibits interesting structural and electronic properties. While borophene is typically prepared by molecular beam epitaxy, we report here on an alternative way of synthesizing large single-phase borophene domains by segregation-enhanced epitaxy. X-ray photoelectron spectroscopy shows that borazine dosing at 1100 degrees C onto Ir(111) yields a boron-rich surface without traces of nitrogen. At high temperatures, the borazine thermally decomposes, nitrogen desorbs, and boron diffuses into the substrate. Using time-of-flight secondary ion mass spectrometry, we show that during cooldown the subsurface boron segregates back to the surface where it forms borophene. In this case, electron diffraction reveals a (6 x 2) reconstructed borophene chi(6)-polymorph, and scanning tunneling spectroscopy suggests a Dirac-like behavior. Studying the kinetics of borophene formation in low energy electron microscopy shows that surface steps are bunched during the borophene formation, resulting in elongated and extended borophene domains with exceptional structural order.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Omambac, Karim M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petrovic, Marin UNSPECIFIED UNSPECIFIED UNSPECIFIED Bampoulis, Pantelis UNSPECIFIED orcid.org/0000-0002-2347-5223 UNSPECIFIED Brand, Christian UNSPECIFIED orcid.org/0000-0002-2984-4456 UNSPECIFIED Kriegel, Marko A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dreher, Pascal UNSPECIFIED orcid.org/0000-0001-8975-1983 UNSPECIFIED Janoschka, David UNSPECIFIED orcid.org/0000-0002-4311-330X UNSPECIFIED Hagemann, Ulrich UNSPECIFIED UNSPECIFIED UNSPECIFIED Hartmann, Nils UNSPECIFIED UNSPECIFIED UNSPECIFIED Valerius, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Zu Heringdorf, Frank J. Meyer UNSPECIFIED UNSPECIFIED UNSPECIFIED Horn-von Hoegen, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-583791
DOI:	10.1021/acsnano.1c00819
Journal or Publication Title:	ACS Nano
Volume:	15
Number:	4
Page Range:	S. 7421 - 7430
Date:	2021
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1936-086X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEXAGONAL BORON-NITRIDE; 2D MATERIALS; GRAPHENE; INTERFACES; ISLANDS; GROWTH Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58379