A kind of oriented carbon nanotube-alumina hybrid fiber and preparation method thereof

Abstract

An oriented carbon nano tube and aluminum oxide hybrid fiber comprises a carbon nano tube fiber and an aluminum oxide film evenly coated on the surface of the carbon nano tube fiber; the oriented carbon nano tube and aluminum oxide hybrid fiber is of a core-shell oriented structure. A preparation method of the oriented carbon nano tube and aluminum oxide hybrid fiber comprises the steps that the carbon nano tube fiber is subjected to hydroxylation pretreatment; then the carbon nano tube fiber is put into a cavity of an atomic layer deposition system; precursor gas pulses of the aluminum oxide are introduced so that a single atomic layer can be formed; the residual precursor of the aluminum oxide is discharged through the inert gas pulses; steam gas pulses are introduced and make a chemical reaction with the precursor of the aluminum oxide adsorbed on the surface of the carbon nano tube fiber; and by controlling the number of cycle times of the above steps, accurate control over the thickness of the aluminum oxide film layer deposited on the carbon nano tube fiber is achieved. The oriented carbon nano tube and aluminum oxide hybrid fiber is high in conductivity and the interface of the carbon nano tube / aluminum oxide can be increased to the greatest extent.

Description

technical field [0001] The invention relates to the field of new materials and their preparation, in particular to a carbon nanotube-alumina hybrid fiber and a preparation method thereof. Background technique [0002] Carbon nanotube fibers not only have high tensile strength, modulus, good toughness, but also have good electrical conductivity. The excellent mechanical and electrical properties of carbon nanotube fibers determine its wide application in functional materials, microelectronics and other fields. The aluminum oxide film has the characteristics of high dielectric constant and high breakdown field strength. At the same time, it has good adhesion to different materials. Considering the respective advantages of carbon nanotube fibers and alumina, carbon nanotube-alumina hybrid fibers have attracted widespread attention due to their good dielectric properties and good thermal conductivity. [0003] At present, researchers have used various methods to prepare carbon...

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Problems solved by technology

Although the above preparation methods can retain the original orientation structure and morphology of the macroscopic carbon nanotube aggregates, it is difficult for the deposits to penetrate deep into the interior of the carbon nanotube aggregates, and it is impossible to achieve a uniform coating of alumina on the surface of the aligned carbon nanotubes. The controllable and reproducible preparation of the coating thickness becomes particularly difficult

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