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Can atomic force microscopy achieve atomic resolution in contact mode?

M R Jarvis1, R Pérez, M C Payne

  • 1Theory of Condensed Matter, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 OHE, United Kingdom.

Physical Review Letters
|February 15, 2001
PubMed
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Atomic force microscopy (AFM) can achieve atomic resolution imaging. However, tip blunting during scanning can limit imaging precision, even with strong atomic forces.

Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Atomic Force Microscopy (AFM) is a high-resolution surface imaging technique.
  • Contact mode AFM involves physical interaction between the tip and sample surface.
  • Understanding tip-surface interactions is crucial for achieving atomic resolution.

Purpose of the Study:

  • To investigate the forces sustained by a single-atom terminated tip in contact mode AFM.
  • To explore the limitations of atomic resolution imaging due to tip-surface interactions.

Main Methods:

  • Utilized total-energy pseudopotential calculations.
  • Simulated contact mode Atomic Force Microscopy with a diamond tip and diamond surface.

Main Results:

Related Experiment Videos

  • A single-atom terminated diamond tip can sustain forces exceeding 30 nN.
  • Tip blunting during lateral scanning was identified as a potential limitation for atomic resolution imaging.

Conclusions:

  • High forces are possible between single-atom tips and surfaces in AFM.
  • Tip degradation is a critical factor affecting the fidelity of atomic resolution imaging in contact mode AFM.