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Method for selectively synthesizing paltelet carbon nanofiber

A technology of carbon nanofibers and synthesis methods, applied in the direction of nanotechnology, nanotechnology, carbon compounds, etc., can solve the problems of carbon nanofiber dysfunction, inability to synthesize sheet-type carbon nanofibers, inability to continuously synthesize carbon nanofibers, etc.

Active Publication Date: 2011-03-23
ELECTRIC POWER DEVELOPMENT COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the methods described in Patent Documents 1 to 5 have a problem in that they cannot only selectively synthesize sheet-type carbon nanofibers, and the obtained carbon nanofibers are any mixture of the above three types.
[0015] However, there is a problem that the carbon nanofibers thus synthesized become a mixture of carbon nanofibers of three crystalline structures
Therefore, depending on the application of the carbon nanofibers, the fine particles that enter may cause the dysfunction of the carbon nanofibers. In this case, there is a problem that a purification process is required to remove the fine particles.
In addition, there is a problem that carbon nanofibers cannot be continuously synthesized due to the need for catalyst exchange

Method used

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  • Method for selectively synthesizing paltelet carbon nanofiber
  • Method for selectively synthesizing paltelet carbon nanofiber
  • Method for selectively synthesizing paltelet carbon nanofiber

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Embodiment 1

[0075] An iron-based alloy steel (SUS440C) containing chromium was installed as a catalyst in the reactor, and the pressure in the reactor was set to maintain 1 atmosphere. First, replace the reactor with hydrogen to activate the catalyst. Then, the temperature in the reactor was raised to 600°C, and the raw material gas CO / hydrogen mixed gas was introduced into the reactor at a ratio of CO / hydrogen = 1 / 10 or less expressed by a molar ratio. After maintaining this state for 30 minutes, the composition of the raw material gas was changed to CO / hydrogen=1 / 4 to increase the ratio of CO gas to synthesize carbon nanofibers.

[0076] As a result, the scanning electron micrograph of the sheet-shaped carbon nanofibers is as follows Figure 4 Shown. by Figure 4 It was confirmed that sheet-type carbon nanofibers were obtained with a high selectivity of over 90%.

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Abstract

Disclosed is a method for synthesizing a platelet carbon nanofiber comprising a step wherein a raw material gas containing a carbon source gas is brought into contact with a catalyst containing at least iron. The catalyst has a layer for suppressing intrusion of carbon into the inner part thereof and the partial pressure of the carbon source gas in the raw material gas is changed from a low partial pressure to a high partial pressure in the step wherein the raw material gas is brought into contact with the catalyst.

Description

Technical field [0001] The invention relates to a selective synthesis method of high-purity sheet carbon nanofibers based on a vapor deposition method. [0002] This application claims priority based on Japanese Patent Application No. 2005-231595 filed in Japan on August 10, 2005, and the content is used here. Background technique [0003] Carbon nanofibers are carbon-based materials that are expected to be used in various fields. According to their crystal structure, three types are known: sheet type, herringbone type, and tube type. [0004] The electrical properties, optical properties, and mechanical properties of carbon nanofibers are different according to the above-mentioned structure, and carbon nanofibers of any crystalline structure can be selectively synthesized according to the use of carbon nanofibers. In particular, the sheet type is expected to be used as a material for battery electrodes or electron emission sources with electron donating and receiving functions, or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/127
CPCB01J23/862C01B31/0233B82Y40/00B82Y30/00D01F9/127H01M4/663C01B32/162Y02E60/10
Inventor 西井俊明山崎悟志桝山直人
Owner ELECTRIC POWER DEVELOPMENT COMPANY