Catalyst slurry for preparing CNTs and method for preparing CNTs on different fiber substrates

Abstract

The invention relates to catalyst slurry for preparing CNTs and a method for preparing CNTs on different fiber substrates. The catalyst takes high-activity nanoparticles of iron, cobalt, and nickel as catalyst bodies; nanometer ceramic powder is taken as a dispersant; an ultrasonic dispersing method is adopted to prepare the catalyst slurry; required substrate materials are immersed and dried; and a CVD method is adopted for realizing low-temperature fast CNTs growth. The method has advantages that: by adopting a slurry hanging method, the catalyst is effectively and uniformly loaded on the surfaces of fibers, and controllable morphology and structure and uniform dispersion of low-temperature fast CNTs growth is realized by combining the CVD method. A resin is added to further provide sufficient carbon sources for CNTs growth via the CVD method. CNTs grow through the CVD method in short time at a low temperature, so that damage, due to high temperature, to fibers is reduced, synergetic enhancement of microstructure and nanostructure is realized, and the function of CNTs is improved.

Description

technical field [0001] The invention belongs to a low-temperature short-time controllable CVD CNTs growth process, in particular to a catalyst slurry used for CNTs preparation and a method for preparing CNTs on different fiber substrates. Background technique [0002] Carbon nanotubes have low density, large specific surface area, good thermal conductivity and excellent mechanical properties, and have been successfully used in many fields such as mechanical enhancement, electrochemical devices, field emission, shielding and absorbing materials. However, there are still many problems in how to realize the preparation of carbon nanotube composites at low cost, in large quantities, in large sizes, and in complex shapes, and how to make the excellent properties of microscopic carbon nanotubes macroscopic. Continuous fiber, with good mechanical properties and easy formability, has become the most commonly used reinforcement in composite materials. Considering the advantages of c...

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Problems solved by technology

[0005] However, these methods have their own problems: the PVD process sputters only on the surface, and for fiber substrates with curvature, it is difficult to take into account the curved surface and enter the interior of the fiber; the atomic layer deposition method uses complicated materials and expensive equipment, and is not suitable for mass production ; The reaction temperature of the floating catalytic process is mostly concentrated in the high temperature zone of 750 ° C ~ 850 ° C, which will cause certain damage to the fiber strength; the method of slurry impregnation is simple and easy, suitable for mass production, but there is uneven distribution of catalysts , the concentration is difficult to control and many other difficulties

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