A method for preparing vertical arrays of carbon nanotubes covered with flexible thin layers of carbon

Abstract

The invention specifically relates to a preparation method for a flexible vertically-aligned carbon nanotube array covered with thin-layer carbon, belonging to the field of preparation of flexible vertically-aligned carbon nanotube arrays. The preparation method comprises the following steps: depositing a thin layer of carbon on the surface of a substrate through plasma deposition; then growing carbon nanotubes by using a plasma-enhanced chemical vapor deposition method so as to obtain a composite structure of a vertically-aligned carbon nanotube array covered with the thin-layer carbon, wherein the thin-layer carbon located at the top allows the carbon nanotubes in the vertically-aligned array to be interconnected so as to guarantee that all the carbon nanotubes in the array participate in heat transfer; simply pressing the vertically-aligned array and peeling the vertically-aligned array from the substrate so as to obtain the self-supported flexible vertically-aligned carbon nanotubearray. The prepared self-supported flexible vertically-aligned carbon nanotube array has excellent thermal conductivity, good bendability and strong adhesion, and has good application prospects in the fields of flexible thermal interface materials and flexible energy storage materials.

Description

technical field [0001] The invention relates to the field of preparation of vertical arrays of flexible carbon nanotubes, in particular to a method for preparing vertical arrays of flexible carbon nanotubes covered with carbon nanotubes. Background technique [0002] The carbon nanotube vertical array is composed of carbon nanotubes arranged in parallel perpendicular to the substrate, and the array can have up to 1.5×10 13 The surface density and high-density axial heat conduction channels make it a perfect macro heat conduction structure. Compared with traditional thermal interface materials, carbon nanotube vertical arrays have outstanding advantages such as high thermal conductivity, compressibility, anisotropic thermal conductivity, low thermal expansion coefficient in the radial plane, light weight, anti-aging, anti-oxidation, etc. It is expected to become a new generation of flexible, high-performance, and low-cost thermal interface materials. [0003] Carbon nanotub...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a vertical array of carbon nanotubes covered by a flexible thin layer of carbon, which solves key problems such as large contact thermal resistance on the surface of the array, difficulty in preparing a self-supporting flexible array, and the fact that some carbon nanotubes in the array do not participate in heat conduction. For high thermal conductivity, flexible and self-supporting vertical arrays of carbon nanotubes

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