Identification of Au-S complexes on Au(100)

Area of Science:

• Surface Science
• Materials Chemistry
• Computational Chemistry

Background:

• Sulfur adsorption on gold surfaces can induce significant structural changes.
• Understanding the atomic-level interactions is crucial for catalysis and electronics.

Purpose of the Study:

• To identify and characterize gold-sulfur complexes formed on Au(100).
• To investigate the role of these complexes in surface reconstruction.

Main Methods:

• Scanning Tunneling Microscopy (STM) for atomic-scale imaging.
• Density Functional Theory (DFT) calculations for electronic structure and bonding analysis.

Main Results:

• Identified a series of related Au-S complexes, with a predominant diamond-shaped Au4S5 complex.
• Observed complexes within or at the edges of p(2 × 2) sulfur islands.
• Developed a model for competitive formation of complexes, Au rafts, and sulfur islands.

Conclusions:

• Au-S complexes are integral to the surface restructuring induced by sulfur adsorption on Au(100).
• The findings provide a deeper understanding of the fundamental interactions governing gold-sulfur systems.