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Tilting in coronene layers on Au(111).

Nathaniel W Kabat1, Ehsan Monazami, Petra Reinke

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Coronene molecules form ordered layers on metal surfaces. Advanced image analysis of scanning tunneling microscopy (STM) data revealed subtle tilting of coronene on gold (Au(111)) after annealing, demonstrating a new method for structural analysis.

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Area of Science:

  • Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Controlling molecular adsorption and ordering is crucial for developing molecule-based functional materials.
  • Understanding the precise geometry of adsorbed molecules on surfaces is key to material design.

Purpose of the Study:

  • To investigate the molecule layer structures of coronene on Au(111) and highly oriented pyrolytic graphite (HOPG).
  • To develop and apply advanced image analysis techniques for precise determination of molecular adsorption geometry.

Main Methods:

  • Scanning tunneling microscopy (STM) was employed to image coronene layers.
  • Python-based open-source code was utilized for image analysis, including histograms of molecular radius and apparent height.
  • Statistical image analysis was used to deduce molecular tilting upon annealing.

Main Results:

  • Coronene forms densely packed layers on Au(111) and HOPG at room temperature.
  • Annealing at 116 °C induced an approximately 11 ± 4° tilt in coronene molecules on Au(111).
  • The reliability of statistical analysis was confirmed by assessing apparent height modulation with bias voltage.

Conclusions:

  • Advanced image analysis combined with STM data enables the extraction of subtle changes in molecular layer structures.
  • This methodology provides a powerful tool for understanding and controlling molecular ordering on surfaces.