Single-walled carbon nanotube, carbon fiber aggregate containing the single-walled carbon nanotube, and method for production of the single-walled carbon nanotube or the carbon fiber aggregate

A technology of single-walled carbon nanotubes and manufacturing methods, which is applied in the direction of single-walled carbon nanotubes, carbon nanotubes, and nanostructure manufacturing, and can solve problems such as thick diameters, unevenness, and failure to meet the requirements of practical applications.

Active Publication Date: 2009-05-20
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the diameter of the multilayer carbon nanotubes is more than 5nm, which is not only thick but also uneven in diameter, and the strength of the obtained wire is only about 460 MPa, which cannot meet the requirements of practical applications.

Method used

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  • Single-walled carbon nanotube, carbon fiber aggregate containing the single-walled carbon nanotube, and method for production of the single-walled carbon nanotube or the carbon fiber aggregate
  • Single-walled carbon nanotube, carbon fiber aggregate containing the single-walled carbon nanotube, and method for production of the single-walled carbon nanotube or the carbon fiber aggregate
  • Single-walled carbon nanotube, carbon fiber aggregate containing the single-walled carbon nanotube, and method for production of the single-walled carbon nanotube or the carbon fiber aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Such as figure 1 As shown, the single-walled carbon nanotubes of the present invention were produced using a vertical single-walled carbon nanotube production apparatus.

[0086] The device consists of: 4kW electric furnace 1, mullite reaction tube 2 with inner diameter of 5.0cm and outer diameter of 5.5cm, nozzle 3, first carrier gas flow meter 4, second carrier gas flow meter 5, micro-feeding Device 6, recovery filter 7, second carbon source flow meter 8, gas mixer 9.

[0087] Store decalin as the first carbon source, ferrocene as the organotransition metal compound, and thiophene as the organosulfur compound as the raw material solution of 100:4:2 by weight in the trace feeder 6, as the second carbon The source uses ethylene, and the flow rate is controlled through the second carbon source flow meter 8 and the gas mixer 9 .

[0088] Using hydrogen at a flow rate of 7 L / min as a carrier gas, the above-mentioned raw material solution was sprayed at a flow rate of 3.2...

Embodiment 2

[0094] The same test as in Example 1 was performed except that the flow rate of the second carbon source was set to 5.0 sccm and the reaction time was set to 1 hour. The product thus obtained was designated as Sample 2.

[0095] Yield is 19.5mg, and the diameter distribution of monolayer carbon nanotube is estimated similarly with embodiment 1, result, as figure 2 As shown, a peak at 2285 nm was observed. This corresponds to a diameter of 1.9 nm.

Embodiment 3

[0097] The same test as in Examples 1 and 2 was performed except that the flow rate of the second carbon source was set to 10.0 sccm. The product thus obtained was designated as sample 3.

[0098] Yield is 20.4mg, and the diameter distribution of monolayer carbon nanotube is estimated similarly with embodiment 1, result, such as figure 2 As shown, a peak at 2120 nm was observed. This corresponds to a diameter of 1.7 nm.

[0099] From the results of Examples 2 and 3, it can be concluded that the diameter of the produced single-walled carbon nanotubes is 0.1-0.2 nm smaller than that of Example 1. This means that by properly adjusting the flow rate of the second carbon source, the diameter of the single-walled carbon nanotubes can be precisely controlled in units of about 0.1 nm.

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Abstract

Disclosed is a single-walled carbon nanotube which is useful as an industrial material such as a high-strength carbon wire, has a controlled diameter, and has a high purity, particularly a uniform single-walled carbon nanotube having a diameter ranging from 1.0 to 2.0 nm. Also disclosed is a method for production of the single-walled carbon nanotube with high efficiency, in a large scale and at low cost. The single-walled carbon nanotube has a diameter ranging from 1.0 to 2.0 nm and also has a ratio between the intensity of G-band and the intensity of D-band (IG / ID ratio) in a Raman spectrum of 200 or greater. The single-walled carbon nanotube or the like can be synthesized by a gas-flow CVD method using a saturated aliphatic hydrocarbon which is in a liquid state at ambient temperature as the first carbon source and an unsaturated aliphatic hydrocarbon which is in a gaseous state at ambient temperature as the second carbon source.

Description

technical field [0001] The present invention relates to single-walled carbon nanotubes, carbon fiber aggregates containing them, and methods for producing them. More specifically, it relates to a method for economically producing carbon fiber aggregates in large quantities by a flow gas-phase CVD method. The carbon fiber aggregate contains single-walled carbon nanotubes whose diameter is controlled by a carbon-containing source. Background technique [0002] As is well known, methods for synthesizing single-walled carbon nanotubes are broadly classified into arc discharge method (see Patent Document 1), laser vapor deposition (see Non-Patent Document 1), chemical vapor deposition (CVD) (see Patent Document 1), and chemical vapor deposition (CVD) (see Patent Document 1). Document 2) These three methods. [0003] Among them, the CVD method is an effective method for large-scale and economical synthesis, and the CVD method generally includes: a substrate CVD method in which a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B3/00D01F9/127D02G3/02
CPCD01F9/133C01B31/0233C01B2202/02C01B2202/36D01F9/127B82Y40/00B82Y30/00C01B32/162Y10T428/2918Y10T428/2982B82B3/0009B82B3/0066C01B2202/30
Inventor 斋藤毅大岛哲汤村守雄
Owner NAT INST OF ADVANCED IND SCI & TECH
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