Hybrid MXene-Graphene/Hexagonal Boron Nitride Structures: Electronic and Molecular Adsorption Properties

Area of Science:

• Materials Science
• Surface Chemistry
• Computational Chemistry

Background:

• Hybrid structures offer unique electronic and adsorption properties.
• Graphene (G) and hexagonal boron nitride (h-BN) are 2D materials with tunable characteristics.
• MXenes, like Mo2C, are emerging materials with diverse applications.

Purpose of the Study:

• Investigate the electronic and molecular adsorption properties of graphene/h-BN-MXene (Mo2C) hybrid nanosheets.
• Explore the impact of G or h-BN integration on Mo2C electronic structure.
• Assess the adsorption capabilities of these hybrid systems for various molecules.

Main Methods:

• First-principles calculations were employed to study the hybrid structures.
• Analyzed the electronic properties and structural defects at the G/h-BN-Mo2C interface.
• Simulated the adsorption of twelve different molecules on pristine and hybrid systems.

Main Results:

• Graphene and h-BN integration created defects and new electronic states near the Fermi energy.
• Hybrid systems exhibited significantly enhanced molecular adsorption compared to pristine materials.
• Specific molecules like OH, NO, NO2, and SO2 were chemisorbed, while others showed physisorption or dissociation.

Conclusions:

• The studied graphene/h-BN-MXene hybrid nanosheets possess tunable electronic properties.
• These hybrid materials demonstrate strong potential for applications in molecular filtration and sensing.
• The enhanced adsorption capabilities suggest utility in catalysis and environmental remediation.