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Molecular self-assembly on an insulating surface: interplay between substrate templating and intermolecular

Markus Kittelmann1, Philipp Rahe, Angelika Kühnle

  • 1Institut für Physikalische Chemie, Johannes Gutenberg-Universität Mainz, Mainz, Germany.

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Molecular self-assembly of biphenyl-4,4′-dicarboxylic acid (BPDCA) on CaCO3 forms ordered 2D islands. The substrate

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Area of Science:

  • Surface science
  • Materials science
  • Nanotechnology

Background:

  • Molecular self-assembly is crucial for creating ordered nanostructures.
  • Calcium carbonate (CaCO3) is a widely studied substrate for surface science experiments.
  • Biphenyl-4,4′-dicarboxylic acid (BPDCA) is an organic molecule with potential applications in materials science.

Purpose of the Study:

  • To investigate the molecular self-assembly of BPDCA on CaCO3(1014).
  • To understand the role of substrate templating in molecular ordering.
  • To elucidate the interplay between intermolecular and molecule-surface interactions.

Main Methods:

  • Ultra-high vacuum (UHV) deposition of BPDCA on CaCO3(1014).
  • High-resolution non-contact atomic force microscopy (NC-AFM) for surface imaging.
  • Crystallographic analysis to determine molecular orientation and ordering.

Main Results:

  • Formation of 2D ordered BPDCA islands and a 2D gas-like phase at room temperature.
  • Ordered molecular islands exhibit rows aligned along the [4261] direction.
  • Inter-row distances are multiples of the CaCO3 unit cell, indicating substrate templating.
  • Coexistence of substrate-templated rows and bulk-like structures formed via hydrogen bonding.
  • Evidence of strong BPDCA-surface binding due to size-matching with the substrate.

Conclusions:

  • The CaCO3(1014) substrate effectively templates the self-assembly of BPDCA molecules.
  • A balance between intermolecular forces and molecule-surface interactions governs the observed structures.
  • This study provides insights into designing ordered molecular assemblies on inorganic surfaces.