Drastic Au(111) surface reconstruction upon insulin growth factor tripeptide adsorption

Area of Science:

• Surface Science
• Materials Science
• Biophysics

Background:

• Adsorption of biomolecules on metal surfaces typically forms 2D ordered layers.
• Metal substrate reconstruction is rare at room temperature and usually requires annealing.

Purpose of the Study:

• To investigate the effect of insulin growth factor tripeptide adsorption on the Au(111) surface.
• To explore room-temperature surface reconstruction driven by molecular adsorption.

Main Methods:

• Scanning Tunneling Microscopy (STM) to visualize surface changes.
• Theoretical calculations to understand the molecular-level mechanisms.

Main Results:

• Drastic room-temperature reconstruction of the Au(111) surface observed.
• Surface reconstruction initiated at kinks and step edges, also occurring on defect-free terraces.
• Dynamic and time-evolving reconstruction process documented.

Conclusions:

• Insulin growth factor tripeptide molecules can induce significant Au(111) surface reconstruction at room temperature.
• The observed reconstruction is a dynamic process, not requiring thermal annealing.
• Molecular interactions drive substantial changes in metal surface morphology.