Mechanical properties of phosphorene nanotubes: a density functional tight-binding study

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Phosphorene nanotubes (PNTs) are emerging nanomaterials with potential applications in electronics and mechanics.
• Understanding their mechanical properties under tensile strain is crucial for device design.

Purpose of the Study:

• To investigate the elastic properties, deformation, and failure mechanisms of armchair (AC) and zigzag (ZZ) PNTs under uniaxial tensile strain.
• To analyze the influence of tube diameter on these mechanical properties.

Main Methods:

• Density Functional Tight-Binding (DFTB) method was employed for simulations.
• Uniaxial tensile strain was applied to AC and ZZ PNTs.

Main Results:

• PNT deformation and failure are highly anisotropic.
• ZZ PNTs show three deformation phases: elastic, bond rotation, and bond elongation.
• AC PNTs fail primarily through bond stretching.
• Failure strain and stress are diameter-dependent, while elastic moduli and Poisson ratios are relatively insensitive.

Conclusions:

• The study provides detailed insights into the mechanical behavior of AC and ZZ PNTs.
• Findings offer valuable references for the design and application of PNTs in various devices.