Defect-Mediated, Thermally-Activated Encapsulation of Metals at the Surface of Graphite

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Date
2017-11-01
Authors
Zhou, Yinghui
Lii-Rosales, Ann
Kim, Minsung
Wallingford, Mark
Jing, Dapeng
Tringides, Michael
Wang, Cai-Zhuang
Thiel, P.
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Ames National Laboratory
Abstract

We show that 3 metals – Dy, Ru, and Cu – can form multilayer intercalated (encapsulated) islands at the graphite(0001) surface if 2 specific conditions are met: Defects are introduced on the graphite terraces to act as entry portals, and the metal deposition temperature is well above ambient. Focusing on Dy as a prototype, we show that surface encapsulation is much different than bulk intercalation, because the encapsulated metal takes the form of bulk-like rafts of multilayer Dy, rather than the dilute, single-layer structure known for the bulk compound. Carbon-covered metallic rafts even form for relatively unreactive metals (Ru and Cu) which have no known bulk intercalation compound.

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