The application belongs to the technical field of nanometer material preparation, and particularly relates to a controlled growth method of high
aspect ratio single-wall carbon nanotubes. The method aims to solve the problems of limited
aspect ratio caused by easy catalyst agglomeration and difficult growth
kinetics regulation in the prior art. The method comprises the following steps: preparing a supported nanometer catalyst precursor to anchor
metal ions; in-situ reduction to regulate
metal particle size and distribution; establishing a multi-field
coupling reaction environment containing a
carbon source and an
oxygen-containing additive; implementing programmed stepwise
temperature control to guide
carbon atom nucleation and steady growth; and using an online monitoring device to obtain the growth state in real time and realize precise termination. Through accurate control of catalyst activity and carbon-
oxygen balance of the
reaction system, the application can effectively inhibit the generation of multi-wall impurities, realize the continuous extension of single-wall
carbon nanotube length, and obtain a product with ultra-high
aspect ratio and high purity, thereby significantly improving the
structural consistency and performance transmission efficiency of the material.