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

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2018-02-01
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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

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
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Materials Science and Engineering

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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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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.

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Sun Jan 01 00:00:00 UTC 2017
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