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Method for preparing single-walled carbon nanotube by using rhenium as catalyst

A single-walled carbon nanotube and catalyst technology, applied in the field of materials, can solve the problems of inability to meet the requirements of large-diameter SWNTs, inability to grow single-walled carbon nanotubes, and high activation energy for carbon precipitation, achieving short preparation time and easy large-scale production. , good stability

Pending Publication Date: 2022-01-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Group 4-7 elements, such as W, Mo, etc., can form a variety of carbides, of which the carbon content can be as high as 50%. However, due to the high melting point and high stability of this type of carbide, the activation energy of carbon precipitation is too high. Single-walled carbon nanotubes cannot be grown by bulk dissolution and precipitation under certain conditions, and finding suitable growth conditions is a major problem that needs to be solved urgently
[0007] Patent CN1922347 discloses a rhenium catalyst and a method for producing single-walled carbon nanotubes, but it uses a bimetallic catalyst, and at the same time, the prepared single-walled carbon nanotubes have a small diameter of less than 1nm, which cannot meet the requirements of large diameters. Requirements for enrichment preparation of SWNTs

Method used

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  • Method for preparing single-walled carbon nanotube by using rhenium as catalyst
  • Method for preparing single-walled carbon nanotube by using rhenium as catalyst
  • Method for preparing single-walled carbon nanotube by using rhenium as catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Calcining basic magnesium carbonate at 450° C. for 1.5 hours in a muffle furnace to obtain magnesium oxide.

[0043] (2) Take 0.05g of rhenium chloride and 2.5g of magnesium oxide, dissolve in 100ml of deionized water and stir evenly, put the above solution in an oven at 100°C for 10 hours, dry it and grind it in a mortar.

[0044] (3) The ground powder is placed in a muffle furnace and calcined at 1100°C.

[0045] (4) Take the catalyst and place it in a quartz boat, put the quartz boat in the middle of the dual-temperature zone slide-rail CVD furnace, connect the experimental device as required, set the furnace temperature rise program to 15°C / min, and feed Ar at a flow rate of 500 sccm Exclude the air in the device, and when the temperature is 800°C, pull the furnace to the sample to heat. After the sample temperature reaches 800°C and stabilize, turn off Ar, and feed CO at a flow rate of 300 sccm for 40 minutes. After the reaction, turn off CO and feed Ar , stop...

Embodiment 2

[0049] (1) Calcining basic magnesium carbonate at 480° C. for 1.2 hours in a muffle furnace to obtain magnesium oxide.

[0050] (2) Take 0.08g of rhenium chloride and 2.5g of magnesium oxide, dissolve in 100ml of deionized water and stir evenly, put the above solution in an oven at 105°C for 12 hours, dry it and grind it in a mortar.

[0051] (3) The ground powder is placed in a muffle furnace and calcined at 1150°C.

[0052] (4) Take the catalyst and place it in a quartz boat, put the quartz boat in the middle of the dual temperature zone slide rail type CVD furnace, connect the experimental device as required, set the furnace temperature rise program to 12°C / min, and feed Ar at a flow rate of 550 sccm Exclude the air in the device, and when the temperature is 850°C, pull the furnace to the sample to heat. After the sample temperature reaches 850°C and stabilize, turn off Ar, and feed CO at a flow rate of 350 sccm for 50 minutes. After the reaction, turn off CO and feed Ar ,...

Embodiment 3

[0056] (1) Calcining basic magnesium carbonate at 500° C. for 1 hour in a muffle furnace to obtain magnesium oxide.

[0057] (2) Take 0.1g of rhenium chloride and 2.5g of magnesium oxide, dissolve in 100ml of deionized water and stir evenly, put the above solution in an oven at 110°C for 8 hours, dry it and grind it in a mortar.

[0058] (3) The ground powder is placed in a muffle furnace and calcined at 1200°C.

[0059] (4) Take the catalyst and place it in a quartz boat, place the quartz boat in the middle of the dual temperature zone slide rail type CVD furnace, connect the experimental device as required, set the furnace temperature rise program to 10°C / min, and feed Ar at a flow rate of 600 sccm Exclude the air in the device, and when the temperature is 900°C, pull the furnace to the sample to heat. After the sample temperature reaches 900°C and stabilize, turn off Ar, and feed CO at a flow rate of 400 sccm for 30 minutes. After the reaction, turn off CO and feed Ar , st...

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Abstract

The invention belongs to the field of materials, and relates to a method for preparing a single-walled carbon nanotube by using rhenium as a catalyst; aiming at enrichment preparation of large-diameter SWNTs, a rhenium-magnesium oxide (Re / MgO) catalyst is prepared by an impregnation method, carbon monoxide is used as a carbon source for growing the SWNTs, argon is used as a protective gas, Re and MgO are respectively used as the catalyst and a growth carrier, the large-diameter SWNTs with narrow chiral distribution are realized at a specific temperature by using a normal-pressure CVD method.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a method for preparing single-walled carbon nanotubes by using rhenium as a catalyst. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Single-walled carbon nanotubes (SWNTs) have a unique one-dimensional hollow tubular structure and excellent performance. Its broad-spectrum response and high light absorption coefficient make it a promising photodetection material. Excellent electrical, thermal, and mechanical properties, and potential applications involving electronic devices, energy storage, photoelectric sensing, flexible displays, biomedicine, composite materials, etc., ...

Claims

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Application Information

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IPC IPC(8): C01B32/159C01B32/162B01J23/36
CPCC01B32/159C01B32/162B01J23/36C01B2202/36Y02E10/549
Inventor 何茂帅马辰武倩汝李栋张雪婷赵楠
Owner QINGDAO UNIV OF SCI & TECH