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Adventitious hydrocarbons from air adsorb onto surfaces, significantly impacting conductive atomic force microscopy (CAFM) measurements. These contaminants alter the liquid bridge, affecting imaging and current-voltage spectroscopy results.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Materials characterization

Background:

  • Conductive atomic force microscopy (CAFM) is a key technique for nanoscale electrical analysis.
  • A liquid meniscus, typically assumed to be water, forms during ambient CAFM, influencing measurements.
  • Understanding factors affecting CAFM data is crucial for accurate interpretation.

Purpose of the Study:

  • To investigate the impact of adventitious hydrocarbon adsorption on CAFM measurements.
  • To elucidate the role of hydrocarbon contaminants in the formation and composition of the tip-sample liquid bridge.
  • To propose a model explaining the influence of hydrocarbons on CAFM data.

Main Methods:

  • Conductive atomic force microscopy (CAFM) in ambient conditions.
  • Analysis of imaging mode and local spectroscopy (current-voltage or I-V curves).
  • Investigation of adventitious hydrocarbon adsorption on sample surfaces.

Main Results:

  • Adsorption of airborne hydrocarbons significantly affects CAFM data.
  • Hydrocarbon contamination influences both CAFM imaging and I-V spectroscopy.
  • Hydrocarbons are shown to be a component of the liquid bridge between the CAFM tip and sample.

Conclusions:

  • Adventitious hydrocarbons play a critical role in CAFM measurements under ambient conditions.
  • The presence of hydrocarbons in the liquid bridge can lead to misinterpretation of CAFM results.
  • A model is proposed to account for hydrocarbon contamination in CAFM analysis.