Universität zu Köln

Valerius, Philipp, Speckmann, Carsten, Senkovskiy, Boris, V, Gruneis, Alexander ORCID: 0000-0003-2448-6060, Atodiresei, Nicolae and Michely, Thomas ORCID: 0000-0003-1657-1847 (2022). Size-limited high-density nanopore formation in two-dimensional moire materials. Phys. Rev. B, 105 (20). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Patterns formed in monolayer graphene (Gr) and hexagonal boron nitride (h-BN) upon ion irradiation in the temperature range from 950 to 1530 K using 500 eV He+ at normal or 500 eV Xe+ at grazing incidence and fluences up to 2.5 x 10(19) ions/m(2) are investigated by room-temperature scanning tunneling microscopy. Subnanometer pores are created and are distributed with the periodicity of the moire which results from the interaction of the monolayers with their Ir(111) substrate. The moife contains trapping sites for vacancies within each moire unit cell as is investigated in detail for the case of h-BN with the help of ab initio calculations. The density of the nanopores is extremely high in the order of 10(17) pores/m(2) and their size distribution is limited by the size of the vacancy traps causing excess vacancies to be expelled from the array and to anneal at preexistent defects. Successful delamination of a perforated Gr monolayer from the substrate is demonstrated and makes the material accessible for membrane research.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Valerius, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Speckmann, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, Boris, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruneis, Alexander UNSPECIFIED orcid.org/0000-0003-2448-6060 UNSPECIFIED Atodiresei, Nicolae UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED orcid.org/0000-0003-1657-1847 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-671090
DOI:	10.1103/PhysRevB.105.205413
Journal or Publication Title:	Phys. Rev. B
Volume:	105
Number:	20
Date:	2022
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEXAGONAL BORON-NITRIDE; WATER DESALINATION; IONIC TRANSPORT; GRAPHENE; GROWTH Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67109