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Potential- and concentration-dependent self-assembly structures at solid/liquid interfaces.

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We precisely controlled molecular self-assembly of DDBDT on gold surfaces. Changing concentration and electrode potential altered structures from lamellar to herringbone and rhombus, offering new control insights.

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Area of Science:

  • Surface Science
  • Electrochemistry
  • Materials Science

Background:

  • Molecular self-assembly is crucial for creating ordered functional materials.
  • Controlling self-assembly on electrode surfaces is key for electronic applications.
  • Benzo[1,2-b:4,5-b']dithiophene (DDBDT) derivatives are promising organic semiconductors.

Purpose of the Study:

  • To investigate the potential and concentration-controlled self-assembly of DDBDT on Au(111).
  • To understand how electrochemical potential and molecular concentration influence interfacial structures.
  • To establish a phase diagram for DDBDT assembly on Au(111).

Main Methods:

  • In situ electrochemical scanning tunneling microscopy (ECSTM) was employed.
  • Systematic variation of DDBDT concentration and electrode potential.
  • Analysis of molecular surface density and resulting structures.

Main Results:

  • Lamellar structures formed at low DDBDT concentrations.
  • Herringbone-like and rhombus structures formed at high DDBDT concentrations.
  • Negative potential shifts induced transformations from herringbone/rhombus to lamellar structures.

Conclusions:

  • Substrate potential and solute concentration effectively modulate DDBDT self-assembly structures.
  • Molecular surface density is the key factor controlled by potential and concentration.
  • Precise control over molecular self-assembly on solid surfaces is achievable through combined approaches.