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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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Morphology measurements by AFM tapping without causing surface damage: A phase shift characterization.

Yang He1, Yongda Yan2, Yanquan Geng2

  • 1Shenzhen Key Laboratory of Cross-scale Manufacturing Mechanics, Southern University of Science and Technology, Shenzhen 518055, China; SUSTech Institute for Manufacturing Innovation, Southern University of Science and Technology, Shenzhen 518055, China; Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China; The State Key Laboratory of Robotics and Systems, Robotics Institute, Harbin Institute of Technology, Harbin 150001, China; Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China.

Ultramicroscopy
|August 24, 2023
PubMed
Summary
This summary is machine-generated.

Phase shift in atomic force microscopy (AFM) tapping mode indicates tip-surface interaction. This study shows phase shift is a sensitive indicator for nondestructive surface morphology measurement, distinguishing between damaging and non-damaging scans.

Keywords:
AFMPhase shiftPolymerSurface damageTapping mode

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Area of Science:

  • Surface science
  • Materials characterization
  • Nanotechnology

Background:

  • Atomic Force Microscopy (AFM) is crucial for surface morphology measurement.
  • Ensuring non-damaging measurements with AFM is a significant challenge.
  • Tip-surface interactions in AFM tapping mode require further understanding.

Purpose of the Study:

  • To investigate phase shift as a characteristic signal for tip-surface interaction in AFM.
  • To explore the relationship between phase shift and nondestructive surface morphology measurement.
  • To determine the threshold for transitioning from nondestructive to destructive AFM scanning.

Main Methods:

  • Utilizing tapping mode Atomic Force Microscopy (AFM) on poly(methyl methacrylate) thin films.
  • Analyzing phase shift variations with changes in drive amplitude and tip radius.
  • Quantifying tip-surface energy dissipation during scanning.
  • Observing surface morphology changes and plastic deformation.

Main Results:

  • Phase shift increased from 0.47° to 1.85° when drive amplitude was doubled, correlating with observable wrinkles.
  • No significant phase shift occurred with tip radii of 15-20 nm (energy dissipation 10-35 eV), indicating nondestructive interaction.
  • With a tip radius of 55 nm, phase shifts of 0.02-0.64° were observed (energy dissipation 60-110 eV), with minor plastic deformation.
  • Softer surfaces exhibited higher phase shifts under repeated tapping mode scanning.

Conclusions:

  • Phase shift is a sensitive indicator of tip-surface interactions during AFM tapping mode.
  • Phase shift effectively distinguishes between nondestructive and destructive surface morphology measurements.
  • Understanding phase shift is key to optimizing AFM parameters for accurate and non-damaging surface analysis.