Method for preparing carbon nanotubes by electron beam induced deposition

Abstract

The invention provides a method for preparing a carbon nano tube through electron beam induced deposition. The method comprises the following steps of: withdrawing a single semiconductor nanowire; wrapping the surface with an amorphous carbon layer by the electron beam induced deposition technology so as to form a 'core-shell structure' with the nanowire and the amorphous carbon layer; loading a bias voltage; melting the nanowire and converting the amorphous carbon into stratified polycrystal under the effect of joule heat produced by current; and moving the molten nanowire out of the nano tube, thus obtaining a single carbon nano tube. With the adoption of the method, the length, diameter, wall thickness and other parameters of the carbon nano tube can be accurately controlled, the in-situ study can be performed for the formation process of the carbon nano tube, thus sufficient data can be provided for the study on the growth mechanism of the carbon nano tube; the method avoids inclusions and catalysts, so that the obtained carbon nano tube is relatively high in purity. The method can also be popularized to prepare carbon nano tube arrays.

Description

Technical field: [0001] The invention relates to a method for preparing carbon nanotubes in the field of nano-micro composite materials. Background technique: [0002] Carbon nanotubes are one of the nanomaterials with the most research value today. The unique structure and superior physical and chemical properties endow it with great application potential. The important prerequisite for in-depth research on carbon nanotubes is the preparation of carbon nanotubes. How to prepare carbon nanotubes with high purity, low defects and controllable specifications is a historical problem in their performance research and application development. [0003] At present, the commonly used carbon nanotube preparation methods mainly include the following: [0004] 1. Arc discharge method [0005] The arc discharge method is one of the earliest methods used to prepare carbon nanotubes. In 1991, Japanese physicist Sumio Iijima first discovered carbon nanotubes from carbon fibers produced...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the arc discharge process is difficult to control, the orientation of the prepared carbon nanotubes is uncertain, and the impurity content is high

However, the degree of graphitization of carbon nanotubes prepared by this method is poor, and there are many structural defects.

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