Oxidation treatment based method for separating carbon nano-tube array and substrate

A carbon nanotube array and oxidation treatment technology, which is applied in the field of post-processing technology for the preparation of carbon nanotube arrays, to achieve the effect of reducing costs

Active Publication Date: 2009-01-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it can be seen from this kind of research on assisted growth that most of them only focus on the interaction of a single tube, and there is still little separation between the array macroscopic body and the substrate.

Method used

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  • Oxidation treatment based method for separating carbon nano-tube array and substrate
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  • Oxidation treatment based method for separating carbon nano-tube array and substrate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Carbon nanotube array prepared by planktonic chemical vapor deposition by carbon dioxide oxidation

[0026] A quartz substrate is used as the substrate, which is then placed in a fixed-bed reactor. The temperature was raised to a reaction temperature of 800° C. under an atmosphere of hydrogen and argon. Then pass through the xylene solution of ferrocene, and the xylene is catalyzed and cracked to form the carbon nanotube array. After 1 hr, the feed of the xylene solution was turned off, carbon dioxide was introduced at 800° C. for oxidation treatment, and the volume concentration of carbon dioxide was 0.030%. After the oxidation treatment process continued for 30 minutes, the feed of carbon dioxide was cut off and the reactor was lowered to room temperature under a protective gas. A carbon nanotube array with a length of 1 mm can be obtained on the quartz surface. The carbon nanotubes at the bottom of the carbon nanotube array and the substrate and the carbo...

Embodiment 2

[0027] Example 2: Carbon Nanotube Arrays Prepared by Air Oxidation Treatment by Planktonic Chemical Vapor Deposition

[0028] Ceramic balls whose main component is Al2O3 are used as the substrate, and then put into a two-stage fixed-bed reactor. The first section is the catalyst evaporation section, using ferric chloride as the catalyst precursor, and the evaporation temperature is controlled at 260°C; the second section is the carbon nanotube array growth area. The temperature was raised to a reaction temperature of 1000° C. under a helium atmosphere. Then liquefied petroleum gas is introduced, and the carbon nanotube catalyst precursor ferric chloride enters the second-stage reactor through evaporation, where in-situ decomposition occurs to form an iron catalyst, and the liquefied petroleum gas is catalytically cracked to form a carbon nanotube array on the spherical surface. After the reaction was carried out for 10 minutes, the feeding of liquefied petroleum gas was stopp...

Embodiment 3

[0029] Example 3: Carbon nanotube array prepared by chemical vapor deposition using water vapor assisted substrate method

[0030] Using aluminum foil as the substrate, the surface is plated with 10nm iron catalyst by electroplating, then dried, put it into a fixed-bed reactor with a diameter of 25mm, and raise the temperature to the reaction temperature of 600°C under the atmosphere of hydrogen and argon. annealing. The catalyst film ruptures, forming catalyst particles. Nitrogen is used as the carrier gas and it enters the reactor after passing through a scrubber bottle filled with distilled water. The volume concentration of water vapor in the reactor inlet is controlled to be 0.05%, and the inlet temperature of the benzene solution is controlled at 300°C to form an iron catalyst for catalytic cracking. Benzene forms carbon nanotube arrays. After 1 hr, a multi-walled carbon nanotube array with a length of about 20 μm can be obtained on the surface of the aluminum foil. U...

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Abstract

The invention provides an oxidizing treatment-based method for separating carbon nano pipe arrays from the surface of a base plate. In the method, carbon dioxide and water vapor, etc. are taken as weak oxidants, during the growing process of the carbon nano pipe arrays or after the growth of the carbon nano pipe arrays, the carbon nano pipe arrays are subjected to oxidizing treatment and separated from the surface of the base plate by the methods of air flow blowing or mechanical separation. Compared with the conventional chemical vapor deposition preparation method, the carbon nano pipe arrays subjected to weak oxidative atmosphere treatment have weak bonding capability with the base plate, thereby resolving the problem of the separation of the carbon nano pipe arrays from the base plate, not only protecting the arrays from being damaged during separation, but also removing impurities such as unformed carbon, etc. in the arrays by the weak oxidizing treatment and improving the quality of the arrays.

Description

technical field [0001] The invention relates to a post-treatment process for preparing a carbon nanotube array, in particular to a method for separating a carbon nanotube array and a substrate based on oxidation treatment. Background technique [0002] Since carbon nanotube arrays were first prepared in 1996, carbon nanotube arrays have been the focus of attention in the field of nanometers (Li W Z, et al. Science, 1996, 274(5293): 1701). In the carbon nanotube array, because the carbon nanotubes are arranged in parallel, they have similar length, orientation, high purity and other excellent characteristics, so they are widely used. This original carbon nanotube array can be directly made into field emission materials, transparent conductive films, and film materials, and can be further spun to form macroscopic super-strong fibers (Jiang Kaili, etc., patent publication number: CN1483667; Wei Fei, etc., patent publication number : CN1948144A, WO2008055421A1). Even if we use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 魏飞张强黄佳琦朱万诚
Owner TSINGHUA UNIV
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