Journal
APPLIED SURFACE SCIENCE
Volume 593, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153274
Keywords
Li deposition; Epitaxial graphene on Ru(0001); Work function measurement; Low-Energy Electron Microscopy; Photoemission electron microscopy; Real -time surface dynamics
Categories
Funding
- ERDF A way of making Europe
- Regional Government of Madrid, Spain [PID2020-117024GB-C43]
- DGAPA-UNAM
- MCIN/AEI
- [S2018-NMT-4321]
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In this study, Li metal was deposited on the surface of Ru(0001) single crystal with graphene islands. The local work function was measured using low-energy electron microscopy and diffraction, revealing that Li deposition decreases the work function of the graphene islands to a smaller degree than that of the Ru(0001) surface.
Li metal has been deposited on the surface of a Ru(0001) single crystal containing patches of monolayer-thick epitaxial graphene islands. The use of low-energy electron microscopy and diffraction allowed us to in situ monitor the process by measuring the local work function as well as to study the system in real and reciprocal space, comparing the changes taking place on the graphene with those on the bare Ru(0001) surface. It is found that Li deposition decreases the work function of the graphene islands but to a much smaller degree than of the Ru(0001) surface, as corresponds to its intercalation below the graphene overlayer. Finally, the diffusion process of Li out of the graphene islands has been monitored by photoelectron microscopy using a visible-light laser.
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