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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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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: Apr 15, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
09:48

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

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Investigating single molecule adhesion by atomic force spectroscopy.

Frank W S Stetter1, Sandra Kienle1, Stefanie Krysiak1

  • 1Physik-Department E22a, Technische Universität München; IMETUM, Technische Universität München.

Journal of Visualized Experiments : Jove
|April 14, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a method for attaching single molecules to an atomic force microscopy (AFM) tip for surface analysis. This technique enables precise measurement of molecular adhesion forces and energies on various interfaces.

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Last Updated: Apr 15, 2026

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Area of Science:

  • Surface Science
  • Nanotechnology
  • Biophysics

Background:

  • Atomic force microscopy (AFM) is crucial for studying molecular interactions at surfaces and interfaces.
  • Studying single molecules requires minimizing non-specific interactions and ensuring controlled attachment to the AFM tip.

Purpose of the Study:

  • To develop and present an experimental protocol for covalently attaching diverse single molecules to an AFM tip.
  • To enable precise characterization of single-molecule properties on solid surfaces and bio-interfaces.
  • To discuss the advantages and validation methods for single-molecule force spectroscopy experiments.

Main Methods:

  • Covalent coupling of various single molecules onto an AFM tip.
  • Passivation of the AFM tip to prevent non-specific binding.
  • Atomic force spectroscopy to measure adhesion force, adhesion length, and free energy.
  • Desorption of molecules from surfaces like CH3-SAMs, hydrogen-terminated diamond, and supported lipid bilayers.

Main Results:

  • Successful attachment of polytyrosine, PI-g-PS, and POPE molecules to AFM tips.
  • Characterization of molecular desorption under varied solvent conditions.
  • Demonstration of force spectroscopic analysis for adhesion properties.
  • Discussion on criteria for confirming single-molecule studies.

Conclusions:

  • The presented protocol facilitates robust single-molecule force spectroscopy.
  • This method allows for detailed analysis of molecular interactions on different surfaces.
  • The technique provides insights into the behavior of molecules at interfaces, crucial for materials science and biophysics.