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Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy
10:49

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Published on: November 28, 2014

New method for electrostatic force gradient microscopy observations and Kelvin measurements under vacuum.

L Portes1, M Ramonda, R Arinero

  • 1Institut d'Electronique du Sud (IES), UMR CNRS 5214, CC 082, France.

Ultramicroscopy
|June 20, 2007
PubMed
Summary

Researchers observed electrostatic force gradients using amplitude-controlled Atomic Force Microscopy (AFM) and a double-pass method. This technique enables parallel surface voltage or Kelvin imaging alongside morphology, achieving millivolt-level noise.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Atomic Force Microscopy

Background:

  • Observing electrostatic force gradients is crucial for understanding surface properties.
  • Existing methods may have limitations in resolution or parallel imaging capabilities.
  • Atomic Force Microscopy (AFM) is a powerful tool for nanoscale surface analysis.

Purpose of the Study:

  • To demonstrate the observation of both DC and AC electrostatic force gradients.
  • To develop a method for parallel surface voltage or Kelvin imaging with AFM.
  • To explain the experimental observations using a theoretical model.

Main Methods:

  • Utilizing amplitude-controlled Atomic Force Microscopy (AFM) under secondary vacuum.
  • Employing a double-pass method to measure phase shifts.
  • Exploring different flexure mode orders and electrical frequencies.
  • Developing a theoretical model based on linear mechanical oscillator behavior.

Main Results:

  • Successfully observed both DC and AC electrostatic force gradients.
  • Experimental phase shifts were explained by the theoretical model.
  • Achieved parallel surface voltage or Kelvin imaging concurrent with morphology.
  • Attained an RMS noise level in the millivolt range for voltage imaging.

Conclusions:

  • The developed AFM method enables simultaneous measurement of surface topography and electrostatic potential.
  • The theoretical model accurately describes the experimental phenomena.
  • This technique offers high-resolution surface voltage mapping with low noise.