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Related Experiment Videos

Tapping mode imaging and measurements with an inverted atomic force microscope.

Sandra S F Chan1, John-Bruce D Green

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 13, 2006
PubMed
Summary

This study shows inverted atomic force microscopy (i-AFM) can achieve tapping mode imaging. Squeeze film damping, caused by short tips, was overcome for imaging fragile molecules.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Microscopy

Background:

  • Atomic Force Microscopy (AFM) is a powerful tool for nanoscale imaging.
  • Tapping mode AFM offers non-destructive imaging of delicate samples.
  • Inverted AFM (i-AFM) presents unique configurations for sample manipulation and imaging.

Purpose of the Study:

  • To demonstrate the feasibility of tapping mode AFM imaging using an inverted AFM (i-AFM) setup.
  • To investigate and characterize the damping effects observed in the i-AFM tapping mode.
  • To confirm the applicability of i-AFM for imaging fragile molecules despite damping phenomena.

Main Methods:

  • Utilized an inverted atomic force microscope (i-AFM) configuration.
  • Employed tapping mode atomic force microscopy (AFM) with cantilever-supported samples.

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  • Analyzed cantilever oscillation amplitude and identified damping sources.

    • Main Results:

    • Successfully obtained tapping mode AFM images in the i-AFM configuration.
    • Identified "squeeze film damping" as the primary cause for reduced cantilever oscillation amplitude.
    • Observed that shorter tip heights in i-AFM tip arrays exacerbate squeeze film damping.
    • Validated that low-amplitude oscillation regimes, crucial for imaging fragile molecules, are still accessible.

    Conclusions:

    • i-AFM is a viable technique for tapping mode AFM imaging.
    • Understanding and mitigating squeeze film damping is key for optimizing i-AFM performance.
    • The i-AFM approach, despite damping challenges, enables imaging of delicate molecular structures.