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Image distortions of a partially fluorinated hydrocarbon molecule in atomic force microscopy with carbon monoxide terminated tips.

Authors
  • Moll, Nikolaj
  • Schuler, Bruno
  • Kawai, Shigeki
  • Xu, Feng
  • Peng, Lifen
  • Orita, Akihiro
  • Otera, Junzo
  • Curioni, Alessandro
  • Neu, Mathias
  • Repp, Jascha
  • Meyer, Gerhard
  • Gross, Leo
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
Nov 12, 2014
Volume
14
Issue
11
Pages
6127–6131
Identifiers
DOI: 10.1021/nl502113z
PMID: 25247477
Source
Medline
Keywords
License
Unknown

Abstract

The underlying mechanisms of image distortions in atomic force microscopy (AFM) with CO-terminated tips are identified and studied in detail. AFM measurements of a partially fluorinated hydrocarbon molecule recorded with a CO-terminated tip are compared with state-of-the-art ab initio calculations. The hydrogenated and fluorinated carbon rings in the molecule appear different in size, which primarily originates from the different extents of their π-electrons. Further, tilting of the CO at the tip, induced by van der Waals forces, enlarges the apparent size of parts of the molecule by up to 50%. Moreover, the CO tilting in response to local Pauli repulsion causes a significant sharpening of the molecule bonds in AFM imaging.

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