Journal
ACS NANO
Volume 9, Issue 4, Pages 3814-3819Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn506755p
Keywords
highly oriented pyrolytic graphite; surface reactivity; external and internal step edges; frictional force microscopy; atomic layer deposition
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Funding
- Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, U.S. Department of Energy [DE-AC02-05CH11231]
- [IBS-R004-G4]
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We report on the physical and chemical properties of atomic steps on the surface of highly oriented pyrolytic graphite (HOPS) investigated using atomic force microscopy. Two types of step edges are identified: internal (formed during crystal growth) and external (formed by mechanical cleavage of bulk HOPS). The external steps exhibit higher friction than the internal steps due to the broken bonds of the exposed edge C atoms, while carbon atoms in the internal steps are not exposed. The reactivity of the atomic steps is manifested in a variety of ways, including the preferential attachment of Pt nanoparticles deposited on HOPS when using atomic layer deposition and KOH clusters formed during drop casting from aqueous solutions. These phenomena imply that only external atomic steps can be used for selective electrodeposition for nanoscale electronic devices.
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