Defect-mediated, thermally-activated encapsulation of metals at the surface of graphite

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Zhou, Yinghui
Lii-Rosales, Ann
Kim, Minsung
Wallingford, Mark
Jing, Dapeng
Tringides, Michael
Wang, Cai-Zhuang
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Ames National Laboratory

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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.


This is a manuscript of an article published as Zhou, Yinghui, Ann Lii-Rosales, Minsung Kim, Mark Wallingford, Dapeng Jing, Michael C. Tringides, Cai-Zhuang Wang, and Patricia A. Thiel. "Defect-mediated, thermally-activated encapsulation of metals at the surface of graphite." Carbon 127 (2018): 305-311. DOI: 10.1016/j.carbon.2017.10.103. Posted with permission.

Sun Jan 01 00:00:00 UTC 2017