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Method for separating metal or semiconductive carbon nanotubes

A carbon nanotube, separation method technology, applied in nanotechnology, nanotechnology, nanostructure fabrication, etc.

Active Publication Date: 2013-08-07
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 1.2mg of HiPco-CNT (Lot number P0276, Carbon Nanotechnologies.Inc.TX, diameter 1.0±0.3nm) sample, add 3.2ml of 1.2%SDS-0.8%SC mixed aqueous solution. Put the above solution in a circulating tap water bath, use a drill-type ultrasonic breaker (Misonix XL2000) to continuously sonicate 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) at a final concentration of 10% was added to the supernatant to prepare a sample for electrophoresis.

[0077] [Gel electrophoresis]

[0078] Gel for electrophoresis (1 / 10 of the amount of surfactant at the time of ultrasonic dispersion added to 0.4% low-melting point agarose, in this case 0.12% SDS and 0.08% SC; and TB buffer) was 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. Use TB buffer solution containing 1 / 10 o...

Embodiment 2

[0084] The difference from Example 1 is:

[0085] The carbon nanotubes were replaced by CoMoCAT-CNT (SouthWest NanoTechnologies Inc) HiPco-CNT, and the surfactant was a mixture of 1.2% SDS-0.8% SC replaced by 2% SDS. The electrophoresis buffer used TAE instead of TB, and no surfactant was added. Figure 2a and Figure 2b It shows the gel status photos, schematic diagrams and absorption spectrum test results after 60 minutes of electrophoresis. Compared with the absorption spectrum of the CNT dispersion before electrophoretic separation, it was visually confirmed that the ratio of semiconducting CNTs increased in the light green part (1), and in the light gray part (4) before electrophoresis, An increase in the ratio of metallic CNTs occurred. The ratio of semiconducting and metallic CNTs located in the middle position was almost unchanged from that of the sample before separation. These results indicate that metallic and semiconducting CNTs can be separated using CoMoCAT-C...

Embodiment 3

[0088] The difference from Example 1 is:

[0089] After heating and dissolving 0.8% agarose gel added with ×2TB buffer solution, it was mixed with a 1:1 equal volume HiPco-CNT dispersion in a molten state and stirred at room temperature to make a carbon nanotube package. as a sample for electrophoresis. The surfactant was 2% SDS instead of the mixture of 1.2% SDS-0.8% SC, and the electrophoresis time was 25 minutes. Figure 3a and Figure 3b Indicates the photo of the gel condition at the end of electrophoresis, its model diagram and the test results of absorption spectrum. Different from the results of Example 1, the green (1) semiconducting CNT located in the carbon nanotube package that does not move with electrophoretic movement but is still is separated and swims out of the carbon nanotube package. , a metallic CNT in light brownish red (2) located at the front of electrophoresis. On the other hand, there are almost no carbon nanotubes in the intermediate position. T...

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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 of a single nature from single-walled carbon nanotubes with high efficiency, simplicity and low cost. Background technique [0002] As a typical one-dimensional nanomaterial, carbon nanotubes are light in weight and perfectly connected in a carbon hexagonal structure. Since their discovery, carbon nanotubes have become a hot spot of scientific research. Its unique structural characteristics make it have special electrical properties and super mechanical properties, and it shows broad application prospects in optoelectronic devices, composite materials, biological and chemical sensors, etc. [0003] At present, the commonly used carbon nanotube preparation methods mainly include: laser evaporation method, arc discharge method, chemical vapor deposition method (hydrocarbon gas pyrolysis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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