UFM observation of lattice defects in highly oriented pyrolytic graphite

K. Yamanaka

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Ultrasonic force microscopy (UFM) can be used to image the distribution of elastic modulus up to several tens of GPa, which is not possible by the force modulation mode using a soft cantilever of spring constant less than 1 N m-1. It was shown that by careful design of a piezoelectric transducer, together with a sample with small friction force, deflection vibration of the cantilever without torsion vibration is achieved, even during scanning perpendicular to the cantilever axis. Using this UFM, we propose that we have observed lattice defects reproducibly under atomically flat terraces of highly oriented pyrolytic graphite. Some defect was bent at surface steps, suggesting an interaction between the defect and the steps. The depth of a defect was found to be more than 3 nm on an assumption that it is continuous across surface steps. Contrast at the edge of terraces was explained by an geometrical effect associated with excitation of torsion vibration.

Original languageEnglish
Pages (from-to)116-121
Number of pages6
JournalThin Solid Films
Volume273
Issue number1-2
DOIs
Publication statusPublished - 1996 Feb

Keywords

  • Graphite
  • Lattice parameters
  • Pyrolysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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