High throughput scanning μLEED imaging of surface structural heterogeneity: Defective graphene on Cu(111)

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Title
High throughput scanning μLEED imaging of surface structural heterogeneity: Defective graphene on Cu(111)
Author(s)
K.I.W. Lau; K.M. Yu; Da Luo; Rodney S. Ruoff; M.S. Altman
Publication Date
2019-05
Journal
ULTRAMICROSCOPY, v.200, no., pp.67 - 72
Publisher
ELSEVIER SCIENCE BV
Abstract
Micro-low energy electron diffraction (μLEED) is frequently used in conjunction with low energy electron microscopy (LEEM) to learn about local surface structural features in small selected areas. Scanning μLEED measurements performed with a very small electron beam (250 nm) can provide precise quantitative information about structural variations with high spatial resolution. We have developed the Source Extraction and Photometry (SEP) – Spot Profile Analysis (SPA) tool for evaluating scanning μLEED data with high throughput. The capability to automate diffraction peak identification with SEP-SPA opens up the possibility to investigate systems with complex diffraction patterns in which diffraction peak positions vary rapidly for small lateral displacements on the surface. The application of this tool to evaluate scanning μLEED data obtained for defective graphene on Cu(111) demonstrates its capabilities. A rich rotational domain structure is observed in which a majority of the graphene is co-aligned with the Cu(111) substrate and the significant remainder comprises domains with large rotations and small sizes that are comparable to the small beam size. © 2019 Elsevier B.V. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/5638
ISSN
0304-3991
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
Files in This Item:
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