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Heteratom doped carbon nano-tube-graphene complex and preparation method thereof

A technology of carbon nanotubes and heteroatoms, applied in the preparation of heteroatom-doped carbon nanotube-graphene composites based on sheet materials, in the field of heteroatom-doped carbon nanotube-graphene composites, can solve the problem of carbon Difficult growth process of nanotubes, structural damage of carbon materials, poor stability, etc., to facilitate engineering scale-up and mass production, improve reactivity, and improve electrical conductivity

Active Publication Date: 2013-11-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the weak interaction between the active nanoparticles and the matrix of the catalyst prepared by the loading method, the stability at high temperature is poor, which makes it difficult to effectively control the growth process of carbon nanotubes, so the quality of carbon nanotubes prepared by this method is often poor. , thereby affecting the performance of the composite
[0003] Furthermore, pure carbon materials have an inert surface and are not easy to participate in chemical reactions. They often need strong acid oxidation and other means to modify their surface, and these treatments often damage the structure of carbon materials greatly, thus limiting the full expression of their properties.

Method used

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  • Heteratom doped carbon nano-tube-graphene complex and preparation method thereof
  • Heteratom doped carbon nano-tube-graphene complex and preparation method thereof
  • Heteratom doped carbon nano-tube-graphene complex and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] Example 1: Nitrogen-doped carbon nanotube-graphene composites were prepared through a fixed bed using FeMoMgAl LDH as a catalyst.

[0031]Prepare FeMoMgAl with Fe content of 10 % and Mo content of 0.05 % (where Mg and Al account for 60 % and 29.95 % respectively) LDHs are used as catalysts, and 40 mg is evenly spread in a quartz boat, and placed in a tubular fixed bed reaction inside the device. Nitrogen was used as the carrier gas with a flow rate of 200 sccm. Under this atmosphere, the temperature of the reactor was raised from room temperature to 1000 o C; after that, the reaction temperature was maintained at 1000 o C, the mixed gas of methane / hydrogen / ammonia is fed, and the corresponding flow rates are 100, 50, and 60 sccm respectively, and the chemical vapor deposition process is carried out to simultaneously deposit nitrogen-doped carbon nanotubes and graphene. After 10 min, the carbon source methane, the nitrogen source ammonia and hydrogen were turned off, ...

Embodiment 2

[0032] Example 2: Nitrogen-doped carbon nanotube-graphene composites were prepared through a fixed bed using FeMgAl LDH as a catalyst.

[0033] Prepare FeMgAl LDHs with Fe content of 35% (Mg and Al account for 43% and 22% respectively) as a catalyst, take 40 mg evenly spread in a quartz boat, and place it in a tubular fixed-bed reactor. Argon was used as the carrier gas with a flow rate of 200 sccm. Under this atmosphere, the temperature of the reactor was raised from room temperature to 500 o C, then feed the mixed gas of ethylene / hydrogen / acetonitrile, wherein the partial pressures of carbon source ethylene and nitrogen source acetonitrile are 10% and 5% respectively, and carry out chemical vapor deposition process to deposit nitrogen-doped carbon nanotubes. Close ethylene, acetonitrile and hydrogen after 10min, the reactor temperature is raised to 1000 o C, then feed the mixed gas of carbon source ethane and argon, wherein the partial pressure of carbon source ethane is 2...

Embodiment 3

[0034] Example 3: Phosphorus atom-doped carbon nanotube-graphene composite was prepared by using Co / vermiculite as a catalyst through a fluidized bed.

[0035] Co / vermiculite with a Co content of 1% was used as a catalyst, and 1 g was put into a fluidized bed reactor with a diameter of 20 mm. Nitrogen was used as the carrier gas with a flow rate of 600 sccm. Under this atmosphere, the temperature of the reactor was raised from room temperature to 650 o C, after which the reaction temperature was maintained at 650 o C, the mixed gas of carbon source propylene, hydrogen and nitrogen is introduced, wherein the partial pressure of carbon source propylene is 25%, and the process of chemical vapor deposition is carried out to deposit carbon nanotubes. After 20 min, the carbon source propylene was closed, and the reactor temperature was raised to 1200 °C under a nitrogen atmosphere. o C, then pass into the mixed gas of carbon source methane and phosphorus source triphenylphosphine...

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Abstract

The present invention discloses a heteratom doped carbon nano-tube-graphene complex and a preparation method thereof, and belongs to the technical field of new material preparation. The complex comprises carbon nano-tubes and graphene, wherein heteroatoms are introduced into the complex. The preparation method comprises: adopting catalyst active component loading layered material as a catalyst, adopting chemical vapor deposition, and growing the heteratom doped carbon nano-tube and graphene complex in the presence of a heteratom source. The heteratom doped carbon nano-tube-graphene complex has excellent characteristics of more active sites, good conductivity, easy chemical modification and the like based on maintaining of intrinsic e excellent performances of carbon nano-tubes and graphene, and provides good application prospects in the fields of catalysis, electrochemistry, energy storage and conversion, electronic devices, and the like. The preparation method has characteristics of simpleness, easy engineering magnification, and macroscopic quantity preparation achievement so as to promote carbon nano-tube-graphene complex industrial application.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, and in particular relates to a heteroatom-doped carbon nanotube-graphene composite and a method for preparing the heteroatom-doped carbon nanotube-graphene composite based on a sheet material. Background technique [0002] Carbon nanotubes can be regarded as a one-dimensional tubular nanocarbon material formed by curling graphene sheets. The carbon atoms in the ideal carbon nanotube structure are all sp 2 Hybrid bonding method with huge aspect ratio. The structural characteristics of carbon nanotubes determine that they have excellent electromagnetic, mechanical, thermal and other excellent properties. However, in the actual application process, carbon nanotubes are prone to aggregate due to the strong van der Waals force between them, making it difficult to disperse, which seriously hinders the full play of their excellent properties. Graphene is a two-dimensional nano-carbon...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/04B82Y30/00C01B32/162C01B32/186
Inventor 魏飞田桂丽赵梦强张强
Owner TSINGHUA UNIV
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