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The AFM Probe
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Toward a better modulus at shallow indentations-Enhanced tip and sample characterization for quantitative atomic

David S Owen1

  • 1Department of Physics and Astronomy, University of Sheffield, Sheffield, South Yorkshire, UK.

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Summary

Atomic force microscopy (AFM) probe geometry approximations can skew mechanical data on soft materials. This study presents a method to correct shallow indentation measurements for polymers and cells, improving data accuracy.

Keywords:
contact mechanicspolydimethylsiloxaneprobe geometryquantitative atomic force microscopyscanning electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • Atomic force microscopy (AFM) is widely used to characterize material properties.
  • Shallow indentations on soft materials like polydimethylsiloxane (PDMS) can lead to inaccurate mechanical data due to probe geometry approximations.
  • Existing elastic modulus data for PDMS show significant dispersion.

Purpose of the Study:

  • To investigate the impact of probe geometry on AFM measurements of soft materials.
  • To develop a method for improving the accuracy of shallow indentation measurements.
  • To correlate elastic modulus with molecular architecture in PDMS.

Main Methods:

  • Scanning electron microscopy (SEM) to analyze probe tip geometry.
  • Atomic force microscopy (AFM) for indentation experiments on PDMS.
  • Application of Hertz and Sneddon contact mechanics models for data analysis.
  • Comparison of moduli obtained from various analytical techniques.

Main Results:

  • SEM revealed a transition to a flat-punch geometry at the probe apex for shallow indentations.
  • The proposed method addresses sub-100 nm indentations, improving data reliability.
  • Discrepancies in PDMS elastic modulus data were analyzed in relation to molecular structure.

Conclusions:

  • Accurate probe geometry is crucial for reliable AFM mechanical characterization of soft materials.
  • The developed method enhances the accuracy of shallow indentation measurements on polymers and biological cells.
  • This work contributes to a better understanding of elastomer mechanics and AFM data interpretation.