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Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Related Experiment Video

Updated: Jun 10, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
09:48

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

An alternative method to determining optical lever sensitivity in atomic force microscopy without tip-sample contact.

Christopher J Tourek1, Sriram Sundararajan

  • 1Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, USA.

The Review of Scientific Instruments
|August 7, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to measure atomic force microscopy cantilever sensitivity without damaging the tip. A tungsten wire contact method provides accurate optical lever sensitivity measurements, preserving sharp tips.

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Last Updated: Jun 10, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Area of Science:

  • Atomic Force Microscopy
  • Nanotechnology
  • Surface Science

Background:

  • Atomic force microscopy (AFM) requires accurate calibration of cantilever spring constants and optical lever sensitivity.
  • Traditional methods for determining optical lever sensitivity can damage delicate AFM tips through hard surface contact.

Purpose of the Study:

  • To develop a non-contact method for calculating optical lever sensitivity.
  • To prevent tip damage during AFM cantilever calibration.

Main Methods:

  • A sharpened tungsten wire is used to induce controlled cantilever bending via point contact.
  • Beam theory is applied to calculate sensitivity from wire-induced bending.
  • Results are compared to the conventional tip-to-surface contact method.

Main Results:

  • The wire-based technique accurately determines optical lever sensitivity.
  • Sensitivity values obtained using the wire method showed less than 12% difference compared to conventional methods.
  • The novel approach successfully avoids tip-surface interactions.

Conclusions:

  • The wire-based technique offers a simple and effective alternative for AFM optical lever sensitivity calibration.
  • This method preserves the integrity of sharp AFM tips, crucial for high-resolution imaging.
  • Non-contact calibration enhances the longevity and reliability of AFM experiments.