Multi-walled carbon nanotubes (MWCNTs) are an important type of nanomaterial with unique structures and excellent properties. Multi-walled carbon nanotubes consist of multiple coaxial cylindrical graphite layers forming a hollow tube, with the spacing between adjacent cylinders comparable to the interlayer spacing of graphite. MWCNTs can be regarded as multiple single-walled carbon nanotubes of different diameters coaxially nested, with the number of layers ranging from 2 to 50 and the spacing between layers remaining consistent, forming a cable-like multilayer structure. Currently, the main methods for preparing multi-walled carbon nanotubes include arc discharge, laser ablation, chemical vapor deposition (CVD), and flame synthesis. Among these, chemical vapor deposition is widely used due to its simple equipment requirements and high product purity.

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