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Method for separating metal or semiconductive carbon nanotubes

A technology of carbon nanotubes and separation methods, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc.

Active Publication Date: 2010-05-12
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above separation methods can meet the technical indicators of high efficiency, high purity, large scale, and low cost at the same time.

Method used

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  • Method for separating metal or semiconductive carbon nanotubes
  • Method for separating metal or semiconductive carbon nanotubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] [Preparation of CNT dispersion]

[0076] Weigh 1.2 mg of HiPco-CNT (Lot number P0276, Carbon Nanotechnologies. Inc. TX, diameter 1.0±0.3 nm) sample, and add 3.2 ml of 1.2% SDS-0.8% SC mixed aqueous solution. Place the above solution in a circulating tap water bath, use a drill-type ultrasonic breaker (Misonix XL2000) to sonicate continuously for 2 hours (level 6), centrifuge for 4 hours, and take the supernatant. This solution contains many isolated and monodisperse CNTs. Sucrose (50% aqueous solution) with a final concentration of 10% was added to the supernatant to prepare a sample for electrophoresis.

[0077] [Gel electrophoresis]

[0078] The gel for electrophoresis (0.4% low melting point agarose added with 1 / 10 of the amount of surfactant when ultrasonic dispersion is added, in this case 0.12% SDS and 0.08% SC; and TB buffer) are prepared in In a quartz tube with a length of 10 cm, an outer diameter of 7 cm, and an inner diameter of 6 cm. The TB buffer containing 1 / 1...

Embodiment 2

[0084] The difference from Example 1 is:

[0085] For carbon nanotubes, CoMoCAT-CNT (SouthWest NanoTechnologies Inc) is used instead of HiPco-CNT, and the surfactant is a mixture of 2% SDS instead of 1.2% SDS-0.8% SC. The running buffer uses TAE instead of TB, and no surfactant is added. figure 2 Shows the gel condition photos, pattern diagrams, and absorption spectrum test results after 60 minutes of electrophoresis. Compared with the absorption spectrum of the CNT dispersion before electrophoretic separation, it is visually confirmed that the light green part (1) has an increase in the proportion of semiconducting CNTs, while the light gray pre-electrophoresis part (4) An increase in the ratio of metallic CNTs occurred. The ratio of the semiconducting and metallic CNTs in the middle part is almost unchanged from the sample before separation. This result shows that, like HiPco-CNT, metallic and semiconducting CNTs can also be separated when using CoMoCAT-CNT.

[0086] In addit...

Embodiment 3

[0088] The difference from Example 1 is:

[0089] After heating and dissolving the 0.8% agarose gel added with × 2TB buffer, it is mixed with 1:1 equal volume of HiPco-CNT dispersion in a molten state and cooled at room temperature to form a carbon nanotube package. As a sample for electrophoresis. The surfactant uses 2% SDS instead of 1.2% SDS-0.8% SC mixture, and the electrophoresis time is 25 minutes. image 3 Shows the photo of the gel condition at the end of the electrophoresis, its pattern diagram and the results of the absorption spectrum test. The difference from the result of Example 1 is that green (1) semiconducting CNTs that are located in the carbon nanotube package and do not move with the electrophoresis and are stationary are separated and swim out of the carbon nanotube package. , The metallic CNT in light brown red (2) at the front of electrophoresis. There are almost no carbon nanotubes in the middle part. The results show that this method overcomes the prob...

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Abstract

The invention provides a method for separating metal or semiconductive carbon nanotubes, which is characterized in that based on the metal or semiconductive carbon nanotube absorption properties and enriching effect of a separating medium, a semiconductive or metal carbon nanotube enriched area is formed in a simple, convenient, quick and low-cost mode of combining electrophoresis so as to realize the separation of the metal or semiconductive carbon nanotubes. The separating medium is an inorganic or organic macromolecule elastic gel. The temperature of the electrophoresis is between 15DEG C and 30DEG C. The power supply of the electrophoresis is a direct current power supply of 10v-250v. In the method, a separation medium is used to separate the carbon nanotubes, a sample of separated carbon nanotubes is kept in a stable state which is favorable for refined separation and sample recovery, the separation and yield of carbon nanotubes can be realized easily, and the needs for industrial products can be met.

Description

Technical field [0001] The invention relates to a method for separating carbon nanotubes, in particular to a method for separating metallic carbon nanotubes and semiconducting carbon nanotubes with single properties from single-walled carbon nanotubes efficiently, simply and at low cost. Background technique [0002] As a typical one-dimensional nanomaterial, carbon nanotubes are light in weight and perfectly connected in the carbon hexagonal structure. Since their discovery, they have become a hot spot in scientific research. Its unique structural characteristics make it have special electrical properties and super mechanical properties, and show broad application prospects in optoelectronic devices, composite materials, biological and chemical sensors, etc. [0003] Currently, the commonly used methods for preparing carbon nanotubes mainly include: laser evaporation, arc discharge, and chemical vapor deposition (hydrocarbon pyrolysis). However, under current preparation conditio...

Claims

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Application Information

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IPC IPC(8): B82B3/00
Inventor 金赫华李红波李清文
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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