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Internal and external atomic steps in graphite exhibit dramatically different physical and chemical properties

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Title
Internal and external atomic steps in graphite exhibit dramatically different physical and chemical properties
Author(s)
Hyunsoo Lee; Lee H.-B.-R.; Sangku Kwon; Salmeron M.; Jeong Young Park
Publication Date
2015-04
Journal
ACS NANO, v.9, no.4, pp.3814 - 3819
Publisher
AMER CHEMICAL SOC
Abstract
We report on the physical and chemical properties of atomic steps on the surface of highly oriented pyrolytic graphite (HOPG) 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 HOPG). 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 HOPG 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. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2063
ISSN
1936-0851
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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