Mechanical Properties and Behavior of Carbon Nanotubes

Carbon nanotubes exhibit an exceptional combination of stiffness, strength and resilience owing to their unique one-dimensional allotrope of carbon. Single-walled and multi-walled variants both display Young’s moduli on the order of terapascal and tensile strengths approaching tens of gigapascals. The mechanical response of these cylindrical sheets of graphene is highly sensitive to chirality, diameter and wall number, as well as to temperature and strain rate. Under tension, carbon nanotubes demonstrate remarkable elastic limits, whereas compressive and bending loads often provoke buckling and post-buckling phenomena that alter their load-bearing capacity. Structural imperfections, including vacancy and Stone–Wales defects, significantly influence fracture behaviour and energy absorption. Inter-wall van der Waals interactions in multi-walled nanotubes further modulate stiffness and strength, while crosslinking and functionalisation can tailor mechanical performance for targeted applications. Research methods span atomistic simulations, continuum modelling and high-throughput computational approaches. Owing to their superior mechanical characteristics, carbon nanotubes find broad use as reinforcing elements in composite materials, as nanoscale mechanical sensors, and as durable tips in atomic force microscopy.

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Mechanical Properties and Behavior of Carbon Nanotubes publication trend

The graph below shows the total number of articles in mechanical properties and behavior of carbon nanotubes across all publications each year (not limited to Nature Index journals).

Technical terms

Young’s modulus: A measure of elastic stiffness defined as the ratio of true stress to true strain in the linear regime.

Tensile strength: The maximum axial stress that a material can withstand before failure or fracture.

Vacancy defect: A missing atom in the lattice structure, leading to local stress concentration and altered mechanical properties.

Chirality: The geometric arrangement of carbon hexagons around the tube axis, categorised into armchair, zigzag and chiral types that influence physical characteristics.

Buckling: A sudden lateral deformation under compressive load, often resulting in a dramatic change in stiffness and load-bearing behaviour.

References

1. Effect of induced vacancy defects on the mechanical behavior of wavy single-walled carbon nanotubes. Nano Trends (2023).
2. Buckling of Carbon Nanotubes: A State of the Art Review. Materials (2011).
3. Structural and functional imaging with carbon nanotube AFM probes. Progress in Biophysics and Molecular Biology (2001).
4. Machine Learning-Assisted High-Throughput Molecular Dynamics Simulation of High-Mechanical Performance Carbon Nanotube Structure. Nanomaterials (2020).
5. Analysis of Carbon Nanotubes on the Mechanical Properties at Atomic Scale. Journal of Nanomaterials (2010).
6. An Atomistic‐Based Continuum Modeling for Evaluation of Effective Elastic Properties of Single‐Walled Carbon Nanotubes. Journal of Nanomaterials (2016).
7. Carbon Nanotube-Based Nanomechanical Sensor: Theoretical Analysis of Mechanical and Vibrational Properties. Electronics (2017).