Functionalization of liquid-exfoliated two-dimensional 2H-MoS2.

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Layered two-dimensional (2D) inorganic transition-metal dichalcogenides (TMDs) show promise in optoelectronics, catalysis, and medicine.
• Current methods for functionalizing and processing 2D TMDs are limited.

Purpose of the Study:

• To establish a facile route for functionalizing layered molybdenum disulfide (MoS2).
• To investigate the properties of the functionalized MoS2 material.

Main Methods:

• Liquid exfoliation of MoS2.
• Reaction of exfoliated MoS2 with M(OAc)2 salts (M=Ni, Cu, Zn).
• Characterization using X-ray photoelectron spectroscopy (XPS), DRIFT-IR, and thermogravimetric analysis (TGA).

Main Results:

• A new functionalized MoS2-M(OAc)2 material was successfully synthesized.
• The method yields the semiconducting 2H-polytype of MoS2.
• Evidence confirms the coordination of MoS2 surface sulfur atoms to the metal acetate salt.
• Functionalized MoS2 demonstrates improved dispersion in common laboratory solvents.

Conclusions:

• The developed method provides a straightforward approach to functionalize MoS2.
• Functionalization enhances the processability of 2D MoS2, broadening its potential applications.
• This work contributes to the advancement of 2D material processing and application.