Method for preparing single/double walled carbon nano tube structure with small size of tube bundle

Abstract

The invention relates to a technology for preparing a monodisperse single / double walled carbon nano tube, in particular to a method for preparing a single / double walled carbon nano tube structure with a small size of a tube bundle. A nano tube is prepared by adopting a mode of in-situ electric field application-cathode, anode direct current arc discharge; the anode is a consumptive anode formed by pressing graphite, a catalyst and a growth promoter, and an electric field is applied to an arc area through an external lead wire on a stainless steel plate. The method comprises the following steps of: firstly, applying the electric field; then, striking arc and discharging electricity; and finally, co-evaporating the graphite, the catalyst and the growth promoter to generate a single / double walled carbon nano tube. Under the action of the electric field, the surface of each single / double walled carbon nano tube carries electric charge, electrostatic repulsive force between tubes is greatly increased, the nano tube is prevented from being aggregated into a large tube bundle through van der Waals force, so that the single / double walled carbon nano tube which exists in a single or small tube bundle mode and has high quality is obtained. A single / double walled carbon nano tube sample with the small size of the tube bundle retards the change of the intrinsic electric structure of the carbon nano tube by carbon tube aggregation and bundling.

Description

technical field [0001] The invention relates to the preparation technology of monodisperse single / double-walled carbon nanotubes, in particular to a preparation method for synthesizing single / double-walled carbon nanotubes with small tube bundle size by an electric field assisted arc discharge method. Background technique [0002] Since the discovery of carbon nanotubes, it has received great attention because of its unique structure and properties. Theoretical calculations predict that single-walled carbon nanotubes exhibit metallic or semiconducting properties depending on the diameter and chirality. Among double-walled carbon nanotubes The two-layer single-walled carbon nanotubes basically maintained the original conductivity. STM observations have confirmed these predictions. However, usually synthesized single / double-walled carbon tubes exist in the form of large tube bundles. This is because each carbon atom has an unsaturated π bond on the surface of the single / doub...

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Problems solved by technology

However, these liquid-phase-based chemical approaches not only use polymers or surfactants, but also involve multi-step chemical and physical processes, and these chemical methods may also dope single / double-walled carbon nanotubes to change their properties; In addition, the single single / double-walled carbon nanotubes obtained by chemical methods are usually very short (tens to hundreds of nanometers) and easy to reassemble in the liquid phase. Device fabrication and performance research

In addition, Sun et al. explored the use of the Coulomb explosion method to obtain smaller diameter tube bundles, but the efficiency was low [Document 3, Liu GT, Zhao YC, Zheng KH, Liu Z, Ma WJ, Ren Y, Xie SS, Sun LF, Nano Lett.9, 239-244 (2009)]

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