Carbon nanotubes, also known as bucky tubes, are one-dimensional quantum materials with a special structure (the radial dimension is on the order of nanometers, the axial dimension is on the order of microns, and both ends of the tube are basically sealed). Carbon nanotubes are mainly coaxial tubes with several to tens of layers of carbon atoms arranged in a hexagonal shape.

As a one-dimensional nanomaterial, carbon nanotubes are light in weight, perfectly connected in a hexagonal structure, and have many unusual mechanical, electrical, and chemical properties.

Carbon nanotubes can be regarded as graphene sheets rolled up, so according to the number of layers of graphene sheets, they can be divided into: single-walled carbon nanotubes (SWCNTs) and Multi-walled Carbon Nanotubes (MWCNTs).

Carbon nanotubes can be divided into three types according to their structural characteristics: armchair form, zigzag form and chiral form.

According to the conductive properties of carbon nanotubes, they can be divided into metallic carbon nanotubes and semiconducting carbon nanotubes: when n-m=3k (k is an integer), carbon nanotubes are metallic; when n-m=3k±1, carbon nanotubes are Nanotubes are semiconducting.

According to whether there are tube wall defects, it can be divided into: perfect carbon nanotubes and defect-containing carbon nanotubes.

According to the uniformity and overall shape of the shape, it can be divided into: straight tube type, carbon nanotube bundle, Y type, snake type, etc.

Commonly used carbon nanotube preparation methods mainly include: arc discharge method, laser ablation method, chemical vapor deposition method (hydrocarbon gas pyrolysis method), solid phase pyrolysis method, glow discharge method, gas combustion method and polymerization reaction synthesis law etc.

Three elements of carbon nanotube dispersion technology: dispersion medium, dispersant and dispersion equipment