Document Detail


Quantitative Atomic Resolution Force Imaging on Epitaxial Graphene with Reactive and Non-Reactive AFM Probes.
MedLine Citation:
PMID:  23039032     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Atomic force microscopy (AFM) images of graphene and graphite show contrast with atomic periodicity. However, the contrast patterns vary depending on the atomic termination of the AFM tip apex and the tip-sample distance, hampering the identification of the atomic positions. Here, we report quantitative AFM imaging of epitaxial graphene using inert (carbon monoxide-terminated) and reactive (iridium-terminated) tips. The atomic image contrast is markedly different with these tip terminations. With a reactive tip, we observe an inversion from attractive to repulsive atomic contrast with decreasing tip-sample distance, while a non-reactive tip only yields repulsive atomic contrast. We are able to identify the atoms with both tips at any tip-sample distance. This is a prerequisite for future structural and chemical analysis of adatoms, defects and the edges of graphene nanostructures, crucial for understanding nanoscale graphene devices.
Authors:
Mark P Boneschanscher; Joost van der Lit; Zhixiang Sun; Ingmar Swart; Peter Liljeroth; Daniel Vanmaekelbergh
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-7
Journal Detail:
Title:  ACS nano     Volume:  -     ISSN:  1936-086X     ISO Abbreviation:  ACS Nano     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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