Femtosecond laser processing of carbon nanotubes: synthesis, surface modification, and cutting

This paper focuses on the femtosecond laser processing technology for carbon nanotubes. Due to its characteristics of ultrashort pulses, high precision, and low thermal damage, this technology has attracted much attention in the field of nanomaterials. The interaction between femtosecond lasers and carbon nanotubes involves complex physical processes such as multiphoton absorption, enabling precise manipulation of carbon nanotubes, such as laser welding, cutting, and material modification. In terms of synthesis, pulsed laser deposition and laser chemical vapor deposition are important techniques. The former can precisely control the composition and structure of thin films, while the latter can achieve position-selective synthesis of carbon nanotubes. Catalysts play a crucial role in femtosecond laser-induced carbon nanotubes synthesis. Metal catalysts affect the growth and structure of carbon nanotubes, and non-metallic catalysts can enhance catalytic activity and reduce the interference of metal residues. Femtosecond lasers can also modify the surface of carbon nanotubes, including covalent and non-covalent modifications, effectively changing their surface morphology and properties. In cutting technology, femtosecond laser uses ultrashort pulses and high energy density to achieve high-precision, low-damage cutting, and can precisely control the length and diameter of carbon nanotubes. Although this technology faces challenges in scale-up and cost control, it has great potential in applications such as electronic devices, sensors, and energy storage. Future research needs to further optimize laser parameters, explore new catalyst systems, and strengthen interdisciplinary cooperation to promote its industrialization.