Super strong 2D titanium carbide MXene-based materials: a theoretical prediction

Area of Science:

• Materials Science
• Mechanical Engineering
• Condensed Matter Physics

Background:

• The development of strong materials is crucial for advanced engineering applications.
• Two-dimensional (2D) materials, particularly MXenes, offer unique properties for practical use.
• Understanding the mechanical behavior of 2D titanium carbide-based MXenes is essential.

Purpose of the Study:

• To systematically investigate the mechanical properties of all known 2D titanium carbide-based MXene monolayers.
• To analyze the influence of MXene thickness on their mechanical characteristics.
• To evaluate the effect of surface functionalization on the strength of these 2D materials.

Main Methods:

• Utilized density functional theory (DFT) computations.
• Calculated in-plane planar elastic constants, Young's moduli, and Shear moduli.
• Examined various surface functionalization groups, focusing on oxygen termination.

Main Results:

• Mechanical properties, including elastic constants and moduli, increase with MXene thickness.
• Surface functionalization significantly enhances the mechanical strength of MXenes.
• The oxygen terminal group demonstrated the most substantial strengthening effect.

Conclusions:

• The 2D Ti4C3O2 monolayer is identified as the strongest among investigated 2D titanium carbide-based MXenes.
• This material exhibits superior mechanical strength compared to graphene.
• The findings provide a theoretical basis for utilizing MXenes in applications requiring exceptional mechanical performance.