Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D39: 2D Materials: Formation Pathways and Mechanisms, Heterostructures and Defects II
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 231
Sponsoring
Unit:
DMP
Chair: Stephen McDonnell, University of Virginia; Stephan Hofmann, University of Cambridge
Abstract: D39.00012 : Watching (De)Intercalation of 2D metals in Epitaxial Graphene: Insight to Defect Healing
5:36 PM–5:48 PM
Presenter:
Sujitra Pookpanratana
(National Institute of Standards and Tech)
Authors:
Sujitra Pookpanratana
(National Institute of Standards and Tech)
Falk Niefind
(NIST)
Jungjoon Ahn
(NIST)
Andrew Winchester
(NIST)
Chengye Dong
(Pennsylvania State University)
Rinu Abraham Maniyara
(Pennsylvania State University)
Joshua A Robinson
(Pennsylvania State University)
Here, we follow the de- and re-intercalation of 2D Ag and Ga within epitaxial graphene (Gr) using photoemission electron microscopy (PEEM). In both cases, we initially start with a fully intercalated system by CHet, Gr/Ag/SiC and Gr/Ga/SiC, and in-situ anneal to nearly 600 K. For the Gr/Ag/SiC system, we find Ag clusters initially diffusing to the top Gr surface and finally re-intercalating through defects. We estimate the Ag intercalation front to be 0.5 nm s-1 ± 0.2 nm s-1. The Gr/Ga/SiC was de-intercalated and followed a much faster kinetic process. The Gr defects serve as intercalation “windows” and were observed in both systems, and we propose that Ag intercalation process heals Gr defects while Ga intercalation does not.
[1] N. Briggs et al., Nature Materials 19, 637-643 (2020).
This work was partially supported by the following grants: NSF DMR-1539916NSF 2D CC, PREP UMD - NIST 70NANB18H165, and PREP Georgetown – NIST 70NANB18H161.
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