Search for encapsulation of platinum, silver, and gold at the surface of graphite

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2020-07-01
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Lii-Rosales, Ann
Han, Yong
Jing, Dapeng
Tringides, Michael
Thiel, Patricia
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Ames National LaboratoryPhysics and AstronomyMaterials Science and EngineeringChemistry
Abstract

Using scanning tunneling microscopy, we show that Pt clusters can be encapsulated beneath the surface of graphite, whereas Ag and Au cannot. This is in complete agreement with independent predictions from density functional theory, which show that surface intercalation of single metal atoms is favorable for Pt, but unfavorable for Ag and Au. This supports the validity of using single-metal-atom energetics for predicting encapsulation of metal nanoparticles at the graphite surface. We also demonstrate that the optimal temperature for encapsulation scales with the cohesive energy of the metal.

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This article is published as Lii-Rosales, Ann, Yong Han, Dapeng Jing, Michael C. Tringides, and Patricia A. Thiel. "Search for encapsulation of platinum, silver, and gold at the surface of graphite." Physical Review Research 2, no. 3 (2020): 033175. DOI: 10.1103/PhysRevResearch.2.033175. Posted with permission.

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Wed Jan 01 00:00:00 UTC 2020
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