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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

Feed-forward compensation of surface potential in atomic force microscopy.

Dominik Ziegler1, Nicola Naujoks, Andreas Stemmer

  • 1Nanotechnology Group, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland.

The Review of Scientific Instruments
|July 8, 2008
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Summary

We developed a new feed-forward method for Kelvin probe force microscopy to eliminate errors in topography scans caused by electrostatic forces. This technique improves accuracy on diverse samples and reduces surface charge modification, enhancing imaging capabilities.

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Area of Science:

  • Surface science
  • Scanning probe microscopy
  • Materials characterization

Background:

  • Kelvin probe force microscopy (KPFM) is crucial for surface potential mapping.
  • Electrostatic forces can induce significant errors in KPFM topography scans, especially on heterogeneous samples.
  • Conventional methods struggle to mitigate these errors effectively.

Purpose of the Study:

  • To introduce a novel feed-forward technique to minimize electrostatically induced errors in lift-mode KPFM topography scans.
  • To enable accurate topography imaging on samples with varying local work functions or surface charges.
  • To assess the impact of the new method on tip-induced surface charge modifications.

Main Methods:

  • Implemented a feed-forward approach in lift-mode KPFM.
  • Biased the tip with the previously recorded surface potential during topography scans.
  • Compared the technique against conventional tapping mode KPFM.

Main Results:

  • Achieved artifact-free topography scans on samples with significant local potential variations.
  • Demonstrated a substantial reduction in tip-induced surface charge modifications on electret films compared to tapping mode.
  • Validated the efficacy of the feed-forward bias technique for accurate surface potential measurements.

Conclusions:

  • The feed-forward technique effectively suppresses electrostatic artifacts in KPFM topography.
  • This method enhances the reliability of KPFM for analyzing materials with complex surface properties.
  • The technique offers a significant advantage in preserving the integrity of charge patterns during analysis.