Enhanced frictive, adhesive and attractive forces imaged at etch-pit edges on highly-oriented pyrolytic graphite by scanning force microscopy

P. Heszler, K. Révész, C. T. Reimann, Á Mechler, Z. Bor

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Etch pit edges or walls, induced on the surface of highly-oriented pyrolytic graphite (HOPG) by oxidative etching at high temperature, comprise a potentially useful model for the active surface sites present on various carbon-based materials. We have studied the interactions between the etch-pit edges and nanometer-sized probe tips using various modes of scanning force microscopy (SFM). The etch-pit edges displayed a approximately 100% increase of the friction force, a approximately 20% increase of the adhesion force of the probe tip, and thus approximately 80% increase of the friction coefficient, compared to unmodified basal plane. In addition to the friction force, a topography-induced lateral force is present at etch-pit edges. This force shows a cosine dependence on the angle between the tip-scanning direction and the normal of the etch-pit side wall curvature, when the tip steps upward from the etch pit to the basal plane. In the non-contact mode (small cantilever oscillation amplitude) evidence for enhanced attraction at etch-pit edges was found that could not be observed in tapping mode (large cantilever oscillation amplitude). Our results show that different modes of SFM provide complementary information on surface topography and variations in surface chemistry on the nanometer scale.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalNanotechnology
Volume11
Issue number1
DOIs
Publication statusPublished - Mar 2000

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Graphite
pyrolytic graphite
adhesives
Atomic force microscopy
Adhesives
Friction
microscopy
scanning
Surface topography
Surface chemistry
Topography
Etching
Carbon
Adhesion
topography
friction
Scanning
oscillations
probes
coefficient of friction

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Enhanced frictive, adhesive and attractive forces imaged at etch-pit edges on highly-oriented pyrolytic graphite by scanning force microscopy. / Heszler, P.; Révész, K.; Reimann, C. T.; Mechler, Á; Bor, Z.

In: Nanotechnology, Vol. 11, No. 1, 03.2000, p. 37-43.

Research output: Contribution to journalArticle

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