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Carbon fiber composite single carbon nano tube and its preparing method

A technology of carbon nanotubes and carbon fibers, which is applied in the field of carbon fiber composite single carbon nanotubes and its preparation, can solve the problems affecting the use characteristics of carbon nanotubes and the combination is not good enough, and achieve the effect of convenient application, stable structure and firm combination

Inactive Publication Date: 2006-11-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that it needs two complete growth processes to form, and its combination is still not good enough
[0005] In addition, the single carbon nanotubes prepared by the existing technology are generally based on silicon, which is easy to form heterogeneous contacts with the carbon nanotubes, which will also affect the use characteristics of the carbon nanotubes.

Method used

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  • Carbon fiber composite single carbon nano tube and its preparing method
  • Carbon fiber composite single carbon nano tube and its preparing method
  • Carbon fiber composite single carbon nano tube and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Proceed as follows:

[0031] (1) Place the graphite rod in analytical pure alcohol solution and deionized water for repeated ultrasonic cleaning, each time for 5 minutes, and finally remove the remaining deionized water droplets on the surface with alcohol solution;

[0032] (2) Utilize the method for vacuum evaporation to vapor-deposit one layer of metal nickel particles on the graphite substrate surface as a catalyst;

[0033] (3) Place the substrate with the nickel catalyst in a vacuumable reaction chamber as one of the electrodes, and form contact with the other electrode. The tightness of the contact should avoid discharge when the current is applied; the two electrodes Both are connected to the power supply outside the chamber;

[0034] (4) The reaction chamber is evacuated, then slowly charged with hydrogen and methane at a partial pressure ratio of 1:5;

[0035] (5) When the pressure in the reaction chamber reached 0.01MPa, the hydrogen flow was maintained at ...

Embodiment 2

[0039] Proceed as follows:

[0040] (1) Place the graphite rod in alcohol solution and deionized water for repeated ultrasonic cleaning, and finally remove the remaining deionized water droplets on the surface with alcohol solution;

[0041] (2) Utilize the method for vacuum evaporation to vapor-deposit one layer of metal iron particles on the graphite substrate surface as a catalyst;

[0042] (3) Place the substrate with the iron catalyst in a vacuumable reaction chamber as one of the electrodes, and form contact with the other electrode. The tightness of the contact should avoid discharge when the current is applied; the two electrodes Both are connected to the power supply outside the chamber;

[0043] (4) The reaction chamber is evacuated, and then slowly charged with ammonia and acetylene at a partial air pressure ratio of 1:1;

[0044] (5) When the pressure in the reaction chamber reached 0.05MPa, the ammonia flow was maintained at 80 ml / min, and the acetylene flow was...

Embodiment 3

[0047] Proceed as follows:

[0048] (1) Place the graphite rod in alcohol solution and deionized water for repeated ultrasonic cleaning to remove impurities, and finally use alcohol solution to remove the remaining deionized water droplets on the surface;

[0049] (2) Utilize the method for vacuum evaporation to vapor-deposit one layer of metal cobalt particles on the graphite substrate surface as a catalyst;

[0050] (3) Place the substrate with the cobalt catalyst in a vacuumable reaction chamber as one of the electrodes, and form contact with the other electrode. The tightness of the contact should avoid discharge when the current is applied; the two electrodes Both are connected to the power supply outside the chamber;

[0051] (4) The reaction chamber is evacuated, then slowly filled with hydrogen and ethylene at a partial pressure ratio of 5:1;

[0052] (5) When the pressure in the reaction chamber reached 0.1MPa, the hydrogen flow was maintained at 80 ml / min, the ethy...

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Abstract

The composite carbon nanotube consists of carbon nanotube, conic carbon fiber and base, and features the carbon nanotube growing vertically on the base and coated inside the conic carbon fiber, and the conic carbon fiber with stretched tip. The preparation process of the composite carbon nanotube includes the following steps: cleaning the base, attaching transition metal catalyst onto the base, setting the base inside one heating equipment capable of being vacuumized and using the base as one electrode contacting to one other electrode, vacuumizing the heating equipment and introducing mixed gas of reductant gas and carbon source gas slowly, applying current across the electrodes after the heating equipment reaches certain pressure to raise the temperature of the base to 1600-2400 deg.c for 30-120 sec before cutting off the power source, and introducing reductant gas to cool the base.

Description

technical field [0001] The invention relates to a carbon nanotube and a preparation method thereof, more specifically, to a carbon fiber composite single carbon nanotube grown on a graphite substrate and a preparation method thereof. Background technique [0002] Carbon nanotubes have a perfect structure and excellent electrical and mechanical properties, and can be used in many nanometer small-scale devices, such as single field emission electron sources and needle tips of various scanning tunneling microscopes. [0003] At present, the existing nano-devices with a single carbon nanotube as the core component, such as: a single field emission device, a needle tip that can be used in a scanning tunneling The manipulation system assembles individual carbon nanotubes onto the tip of a metal needle tip, as figure 1 As shown, it is an assembled single carbon nanotube (de Jonge N, Lamy Y, Schoots K, Oosterkamp TH, High brightness electron beam from a multi-walled carbon nanotube...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/08
Inventor 薛增泉奚中和张耿民张暐王胜吴越王晶云梁学磊吴锦雷彭练矛赵兴钰
Owner PEKING UNIV
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