Method for storing carbon nano-tubes by categories and method for assembling carbon nano-tubes

Abstract

The invention discloses a method for storing carbon nano-tubes by categories and a method for assembling carbon nano-tubes. The method for storing carbon nano-tubes by categories comprises the following steps: cutting a carbon nano-tube into a plurality of carbon nano-tube subsections; covering with a polymer film; making a marker pattern visible under an optical microscope on the polymer film, wherein the marker pattern is used for uniquely confirming the position of each carbon nano-tube subsection; dissolving a substrate or the surface layer of the substrate away; and fishing the polymer film carried with the categorized carbon nano-tube subsections to a hollow frame to obtain the suspended polymer film storing the categorized carbon nano-tube subsections. The invention realizes the large-scale categorized storage and the precise positioning assembly of the carbon nano-tubes.

Description

technical field [0001] The invention relates to micro-nano-scale processing and manufacturing, in particular to a method for classifying and storing carbon nanotubes and a method for assembling carbon nanotubes. Background technique [0002] Different from diamond crystals and graphite crystals with definite lattice structures, carbon nanotubes are a general term for a large class of materials with complex structures and diverse properties. Specifically, not only a single single-walled carbon nanotube is uniquely marked by the curl vector (m, n), there are infinitely many structures in theory (actually constrained by stability, the diameter cannot be too large, so m and n It will not be very large, the diameter of single-walled carbon tubes is generally on the order of ~1nm), based on single-walled carbon nanotubes, there are also widely existing double-walled carbon tubes, multi-walled carbon tubes, single-walled carbon tube bundles, and multi-walled carbon nanotubes. Comp...

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Problems solved by technology

The current solutions are mainly divided into two categories: one is to continue to study the growth mechanism of carbon nanotubes, precisely control the growth conditions, and directly grow carbon tubes with the required specific structure or properties, but these methods are difficult to control. It has not been fully realized; the second is to carry out subsequent separation and purification in the growth products of various carbon nanotubes mixed together to obtain carbon tubes with the desired specific structure or properties.

However, the problem with this type of scheme is that the separation operation is carried out on a mixture of a large number of various types of carbon nanotubes; the separated product is still a mixture of a large number of roughly classified carbon nanotubes, and it is far from realizing the properties of a single carbon nanotube. and structure to precisely classify

However, the disadvantages of this approach are: it is difficult to place specific types of carbon nanotubes one by one in the micrometer-scale area in the operation at the macroscopic scale; the operation at the microscopic scale requires complex and expensive probe equipment, and the efficiency and success rate are very low. Low; regardless of macroscopic or microscopic operations, due to the lack of a reliable storage scheme for carbon nanotubes, it is impossible to easily and accurately assemble the same type of carbon nanotubes in a micron scale

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