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Two-Nanometer voids in single-layer hexagonal Boron Nitride: Formation via the "Can-Opener" effect and annihilation by self-healing


Cun, Huanyao; Iannuzzi, Marcella; Hemmi, Adrian; Osterwalder, Jürg; Greber, Thomas (2014). Two-Nanometer voids in single-layer hexagonal Boron Nitride: Formation via the "Can-Opener" effect and annihilation by self-healing. ACS Nano, 8(7):7423-7431.

Abstract

The exposure of hexagonal boron nitride single layers to low energy ions leads to the formation of vacancy defects that are mobile at elevated temperatures. For the case of h-BN on rhodium, a superhoneycomb surface with 3 nm lattice constant (nanomesh), a concerted self-assembly of these defects is observed, where the “can-opener” effect leads to the cut-out of 2 nm “lids” and stable voids in the h-BN layer. These clean-cut voids repel each other, which enables the formation of arrays with a nearest neighbor distance down to about 8 nm. The density of voids depends on the Ar ion dose, and can reach 1012 cm–2. If the structures are annealed above 1000 K, the voids disappear and pristine h-BN nanomesh with larger holes is recovered. The results are obtained by scanning tunneling microscopy and density functional theory calculations.

Abstract

The exposure of hexagonal boron nitride single layers to low energy ions leads to the formation of vacancy defects that are mobile at elevated temperatures. For the case of h-BN on rhodium, a superhoneycomb surface with 3 nm lattice constant (nanomesh), a concerted self-assembly of these defects is observed, where the “can-opener” effect leads to the cut-out of 2 nm “lids” and stable voids in the h-BN layer. These clean-cut voids repel each other, which enables the formation of arrays with a nearest neighbor distance down to about 8 nm. The density of voids depends on the Ar ion dose, and can reach 1012 cm–2. If the structures are annealed above 1000 K, the voids disappear and pristine h-BN nanomesh with larger holes is recovered. The results are obtained by scanning tunneling microscopy and density functional theory calculations.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:23 Jan 2015 14:00
Last Modified:08 Dec 2017 11:04
Publisher:American Chemical Society (ACS)
Number of Pages:8
ISSN:1936-0851
Publisher DOI:https://doi.org/10.1021/nn502645w

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