Assembling nanowires from Mo-S clusters and effects of iodine doping on electronic structure

Area of Science:

• Materials Science
• Computational Chemistry
• Solid-State Physics

Background:

• Molybdenum-sulfur clusters offer unique structural and electronic properties.
• Understanding the stability and conductivity of Mo-S nanostructures is crucial for materials design.

Purpose of the Study:

• To investigate the stability and electronic properties of Mo-S nanowires using theoretical calculations.
• To explore the effect of iodine doping on the conductivity of these nanowires.

Main Methods:

• Ab initio calculations were employed to determine the energetic stability of Mo-S clusters and nanowires.
• Electronic band structure calculations were performed to analyze the metallic character and charge transport properties.

Main Results:

• High stability of octahedral Mo6S8 clusters and their condensation into Mo3nS3n+2 nanowires were predicted.
• These nanowires exhibit metallic character due to a free electron-like band crossing the Fermi energy.
• Iodine doping (e.g., Mo12S8I4) was found to enhance conductivity by facilitating both electron and hole transport.
• The calculated Mo12S8I4 nanowires are energetically more favorable than experimentally reported Mo12S6I12 nanowires.

Conclusions:

• Mo-S nanowires represent a stable and promising class of materials for electronic applications.
• Iodine doping provides a viable strategy to tune the electronic conductivity of these nanowires.
• Theoretical predictions suggest these novel nanowires could outperform existing experimental counterparts.