Carbon nanotube structure-selective separation and surface fixation

A technology for carbon nanotubes and nanotubes, which is used in the field of concentrating and refining carbon nanotubes, high-selectivity separation, and can solve the problems of low accuracy of single-walled tubes, undescribed carbon nanotubes, and poor separation accuracy.

Inactive Publication Date: 2010-05-12
JAPAN SCI & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Although much research has been done on carbon nanotubes so far, the preparation, separation or purification of single-walled tubes with the same diameter, chirality, work function and band gap still remains very low accuracy (see, for example, Non-Patent Document 5- 12). As for separation based on diameter, Non-Patent Document 9 is an example of related prior art, which discloses the separation of DNA-CNT by ion exchange chromatography. However, it is completely different from the principle of the present invention, and in The separation accuracy is not as good as the technology of the present invention. Moreover, there are some patent applications related to the method of purifying carbon nanotubes (for example, see Patent Documents 1-5). However, all these Patent Documents 1-5 only disclose the technology of removing impurities. These documents therefore do not describe any separation of carbon nanotubes with uniform characteristic physical properties, where diameter, chiral angle, etc. are respectively the same.

Method used

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  • Carbon nanotube structure-selective separation and surface fixation
  • Carbon nanotube structure-selective separation and surface fixation
  • Carbon nanotube structure-selective separation and surface fixation

Examples

Experimental program
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Embodiment 1

[0201] 1.1 Metal deposition on carbon nanotubes

[0202] Carbon nanotubes (CarboLex AP-Grade SWNT (SWNT: purity 50-70%)) in 1% sodium dodecyl sulfate (SDS) aqueous solution were ultrasonically dispersed at 24°C and 12,000 rpm for 15 minutes, and injected The supernatant was filtered with a filter (0.2 μm pore size filter) and subjected to additional sonication and centrifugation under the same conditions to obtain a micellar dispersion.

[0203] Next, methanol (methanol: 99.8% purity, Infinity Pure Grade; commercially available from Wako Pure Chemical Industries, Ltd.) was added as an electron donor to the dispersion to a concentration of 0.1%. The following three different metal ion solutions were added to the above obtained solution to prepare three solutions with different metal ions.

[0204] I) 0.1M Fe(NH 4 ) 2 (SO 4 ) 2 aqueous solution

[0205] II) 0.1M CoCl 2 aqueous solution

[0206] III) 0.1M MnCl 2 aqueous solution

[0207] The three solutions prepared in ...

Embodiment 2

[0213] Figure 8 yes A device structure diagram of an embodiment of the present invention. Light with different wavelength values ​​of 1064nm (λ1), 785nm (λ2) and 514nm (λ3) was used as the light source for photoelectrochemical metal deposition. A micellar dispersion obtained by dispersing the carbon nanotubes before purification in a 1% sodium lauryl sulfate aqueous solution was used as a carbon nanotube-containing solution. Fix the thin film glass in the reaction vessel, and add Fe(NH 4 ) 2 (SO 4 ) 2 To a concentration of 0.1 M, the substrate was irradiated with light of a wavelength (λ1, λ2 or λ3) for 10 minutes. After metal-deposited carbon nanotubes were accumulated on the substrate, the carbon nanotubes were cleaned with sulfuric acid, and Raman spectroscopy measurements were performed in radial breathing mode to determine the chiral vector of the deposited carbon nanotubes. In the part where light was irradiated with the wavelength of λ1, the carbon nanotube was...

Embodiment 3

[0223] Figure 9 A graph showing an experiment performed similarly to Example 2 above, with the additional step of flowing the solution containing carbon nanotubes and continuously supplying the dispersion containing carbon nanotubes. Carbon nanotubes can thereby be selectively deposited similarly to the above, resulting in a two to ten-fold increase in the deposition amount.

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Abstract

A method of separating, concentrating or purifying uniform carbon nanotubes with desired properties (diameter, chiral vector, etc.) in a highly sensitive manner by the use of structure-sensitive properties peculiar to carbon nanotubes; and an apparatus therefor. There is provided a method of separating, concentrating or purifying carbon nanotubes with desired properties contained in a sample, comprising the steps of (a) irradiating a sample containing carbon nanotubes with light; and (b) selecting carbon nanotubes with desired properties. In a preferred embodiment, the light irradiation of thestep (a) can be carried out in the presence of a metal so as to cause specified carbon nanotubes to selectively induce a photocatalytic reaction, resulting in metal deposition. Further, in a preferred embodiment, a given magnetic field can be applied in the step (b) so as to attain accumulation or concentration of carbon nanotubes with metal deposited.

Description

technical field [0001] The present invention relates to a method and equipment for separating, concentrating and refining carbon nanotubes (CNT) with high selectivity. The present invention also relates to high purity carbon nanotubes isolated by the method of the present invention, and thin films and arrays thereof. The present invention further provides an optical device or an electronic device using the carbon nanotube film. Background technique [0002] Carbon nanotubes, a new substance discovered by Sumio Iijima in 1991, can exhibit metallic and / or semiconducting properties depending on their diameter and how the tube is wound. The physical properties of carbon nanotubes are completely different depending on the structure of the tubes, and research in this field is currently being actively carried out. In addition, carbon nanotubes are one of the next-generation materials many of which are expected to be used in devices and the like, and have promising applications in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02B82B3/00G01N27/00G01N30/88G01N37/00G01P15/00H01M4/88H01M4/96G01N13/14B01D39/20B82B1/00B82Y15/00B82Y30/00B82Y35/00B82Y40/00B82Y99/00G01P15/08H01M4/86
CPCC01B2202/30H01M4/96C01B2202/02H01M4/8605Y02E60/50C01B2202/36B82Y40/00G01N2030/8859Y10S977/748Y10S977/845G01P15/08H01M4/9083Y10S977/751C01B31/0266Y10S977/745B82Y15/00Y10S977/848G01P15/0802B82Y30/00C01B32/172C01B32/17
Inventor 村越敬
Owner JAPAN SCI & TECH CORP
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