Manufacturing method of multi-wall nano carbon pipe

Abstract

A method is presented for effectively manufacturing multi-wall (double-wall, etc.) carbon nanotubes (CNTs) having a structure whereby interior tubes are formed within the CNTs. In this manufacturing method, fullerene / CNT hybrid structures are prepared, wherein assembled fullerenes, these being fullerenes that are linked, have been housed within single-wall CNTs. The interior tubes are formed from the assembled fullerenes by subjecting the hybrid structures to electron beam irradiation while in a heated state. It is preferred that irradiation with the electron beams occurs at a temperature of 100~500° C. and with the electron beams having an accelerating voltage of 80~250 kV. According to the manufacturing method of the present invention, multi-wall CNTs with few defects can be manufactured at lower temperatures and in a shorter period than in the case where the fullerene / CNT hybrid structures are only maintained under high temperature conditions (and electron beam irradiation is not performed).

Description

technical field [0001] The present invention relates to carbon nanotubes, and more particularly to a method of manufacturing multi-walled carbon nanotubes having a tubular structure mainly composed of carbon located within the carbon nanotubes. Background technique [0002] Single-walled and multi-walled carbon tubes (CNTs) are known in the prior art and are expected to be useful materials in various fields. CNTs have also been investigated, where the interior of the CNT (inside the tube) is filled with different materials. For example, Unexamined Japanese Patent Applications Publication Nos. 2002-97009 and 2002-97010 disclose composite single-walled CNTs with such a structure (also known as a pod structure), that is, C 60 Isofullerenes are linked in chains in the tube body of single-walled CNTs. [0003] A technique known in the prior art maintains single-walled CNTs having a pod structure (simply referred to as pods in the future) at a temperature of 1100° C. or higher f...

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Problems solved by technology

However, as the pods pointed out above, when the electron beam with an acceleration energy of 100 keV is continuously irradiated (for example, for 5 minutes or longer) under normal conditions, damage to the CNTs forming the outer tube of the pod (structural damage) can be observed. )

When the electron beam irradiation time increases, the damage of the outer tube body also tends to increase

In addition, when the irradiation time is extended, the manufacturing efficiency and energy efficiency decrease, thereby increasing the manufacturing cost

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