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Title: Atomic force microscopy phase imaging of epitaxial graphene films

Journal Article · · JPhys Materials

Abstract Dynamic mode atomic force microscopy phase imaging is known to produce distinct contrast between graphene areas of different atomic thickness. But the intrinsic complexity of the processes controlling the tip motion and the phase angle shift excludes its use as an independent technique for a quantitative type of analysis. By investigating the relationship between the phase shift, the tip-surface interaction, and the thickness of the epitaxial graphene areas grown on silicon carbide, we shed light on the origin of such phase contrast, and on the complex energy dissipation processes underlying phase imaging. In particular, we study the behavior of phase shift and energy dissipation when imaging the interfacial buffer layer, single-layer, and bilayer graphene regions as a function of the tip-surface separation and the interaction forces. Finally, we compare these results with those obtained on differently-grown quasi free standing single- and bilayer graphene samples.

Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0018924
OSTI ID:
1605041
Journal Information:
JPhys Materials, Journal Name: JPhys Materials Journal Issue: 2 Vol. 3; ISSN 2515-7639
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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