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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: May 15, 2026

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
10:25

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

Published on: December 20, 2016

Imaging stability in force-feedback high-speed atomic force microscopy.

Byung I Kim1, Ryan D Boehm

  • 1Department of Physics, Boise State University, 1910 University Drive Boise, ID 83725-1570, United States of America. ByungKim@boisestate.edu

Ultramicroscopy
|January 1, 2013
PubMed
Summary
This summary is machine-generated.

Force-feedback high-speed atomic force microscopy (HSAFM) stability depends on applied force and surface properties. Enhanced stability was achieved on hydrophilic surfaces and for biological samples like E. coli biofilms.

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Area of Science:

  • Surface science
  • Microscopy techniques
  • Biophysics

Background:

  • Atomic Force Microscopy (AFM) is crucial for nanoscale imaging.
  • High-speed AFM (HSAFM) enables dynamic surface studies.
  • Force-feedback mechanisms enhance imaging stability and resolution.

Purpose of the Study:

  • To investigate the stability of force-feedback HSAFM across different sample types and applied forces.
  • To understand the influence of surface properties and imaging parameters on HSAFM stability.
  • To evaluate HSAFM performance for imaging soft biological samples.

Main Methods:

  • Force-feedback HSAFM was employed to image soft hydrocarbon films, hard grating surfaces, and Escherichia coli biofilms.
  • Imaging was performed at various applied forces, including positive and negative values.
  • The effect of imaging rate on stability was assessed for biological samples.

Main Results:

  • HSAFM exhibited instability with negative applied forces on soft hydrocarbon films, attributed to contact/noncontact regime transitions.
  • Imaging stability improved significantly on cleaned, hydrophilic grating surfaces due to higher adhesion.
  • Force-feedback HSAFM demonstrated reproducible imaging of E. coli biofilms within a force deviation of ~0.5 nN at imaging rates up to 0.2s/frame.

Conclusions:

  • Force-feedback HSAFM stability is sensitive to applied force and surface characteristics.
  • Hydrophilic surfaces and increased tip-surface adhesion enhance imaging stability.
  • HSAFM is a stable and reliable technique for imaging soft, adhesive biological samples at various imaging speeds.