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Method for preparing carbon nanohorn

A carbon nanohorn and amorphous carbon technology, which is applied in the field of DC arc preparation of carbon nanohorn, can solve problems such as complicated operation, and achieve the effects of high purity, low production cost and simple equipment.

Inactive Publication Date: 2010-06-30
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

SanoN et al reported the preparation of carbon nanohorns by arc method using water or liquid nitrogen as medium (J.Phys.D: Appl.Phys., 2004, 37, 1720; Nanotechnology, 2004, 15, 546-550), but this The use of water or liquid nitrogen in the method makes the operation more complicated

Method used

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  • Method for preparing carbon nanohorn
  • Method for preparing carbon nanohorn
  • Method for preparing carbon nanohorn

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The electric arc furnace is used for direct current discharge, and the furnace wall of the electric arc furnace is cooled by circulating water. Spectroscopically pure graphite rods are used as the cathode and anode respectively, and the diameter of the graphite rods at both poles is 8 mm. Arc discharge was performed in an air atmosphere with a gas pressure of 380 Torr and a current of 120A. After the anode was consumed, the product was collected and burned in air at 450° C. for 1 hour to obtain dahlia-type carbon nanohorns with a purity of more than 94%. figure 1 It is a scanning electron micrograph of the obtained carbon nanohorn, and the balls in the figure are aggregates of carbon nanohorn, and the diameter is generally 50-80 nanometers. figure 2 The transmission electron micrograph of the obtained carbon nanohorn shows aggregates of carbon nanohorns and a pyramid-like structure at the end of the carbon nanohorns. image 3 is the thermogravimetry and differential ...

Embodiment 2

[0027] The electric arc furnace is used for direct current discharge, and the furnace wall of the electric arc furnace is cooled by circulating water. Spectroscopically pure graphite rods are used as the cathode and anode respectively, and the diameter of the graphite rods at both poles is 8mm. in CO 2 Arc discharge was performed in the atmosphere, the gas pressure was 380 Torr, and the current was 120A. After the anode was consumed, the product was collected and burned in air at 450° C. for 1 hour to obtain bud-type carbon nanohorns with a purity of more than 94%. Figure 4 It is a scanning electron micrograph of the obtained carbon nanohorn, and the balls in the figure are aggregates of carbon nanohorn, and the diameter is generally 50-80 nanometers. Figure 5 It is a transmission electron micrograph of the obtained carbon nanohorn, and it can be seen that the aggregation of the carbon nanohorn and the ends of the carbon nanohorn are relatively smooth.

Embodiment 3

[0029] The electric arc furnace is used for direct current discharge, and the furnace wall of the electric arc furnace is cooled by circulating water. Spectroscopically pure graphite rods are used as the cathode and anode respectively, and the diameter of the graphite rods at both poles is 8mm. Arc discharge was performed in a CO atmosphere with a gas pressure of 500 Torr and a current of 80A. After the anode was consumed, the product was collected and burned in air at 450° C. for 1 hour to obtain bud-type carbon nanohorns with a purity of more than 94%.

[0030] Example four

[0031] The electric arc furnace is used for direct current discharge, and the furnace wall of the electric arc furnace is cooled by circulating water. Spectroscopically pure graphite rods are used as the cathode and anode respectively, and the diameter of the graphite rods at both poles is 8mm. in CO and N 2 Arc discharge was performed in a mixed atmosphere (the volume ratio of the two was 1:2), the...

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Abstract

The invention provides a method for preparing carbon nanohorn, belonging to the technical field of carbon nanohorn synthesis. The carbon nanohorn is prepared by the DC (direct current) arc method in the reaction atmosphere of air, CO2, CO or a gas mixture of CO / N2. The method of the invention meets the requirements for mass production and has the advantages of simple equipment and low preparation cost; moreover, the product of the method has high purity, particularly, the purity of the carbon nanahorn simply subjected to ignition and purification is higher than 94%; and the diameter of the carbon nanohorn prepared by the method of the invention is approximately 25 nanometers, and the carbon nanohorn can be aggregated into a spherical aggregate with the diameter of 50 to 80 nanometers.

Description

technical field [0001] The invention relates to a synthesis technology of carbon nanohorns, in particular to a DC arc preparation method of carbon nanohorns. Background technique [0002] Carbon nanohorn is a new allotrope of carbon discovered in recent years. It can be regarded as a curled single-layer graphite, with an angular closed structure at one end and an open structure at the other end. The diameter of the carbon nanohorn is generally 2-5 nanometers, and the length is several nanometers to tens of nanometers. Carbon nanohorns are usually aggregated into spherical aggregates with a diameter of 50-100 nm, and one end of the pyramid points to the outside of the aggregate. The pyramid-like hollow structure and unique morphology of carbon nanohorns make them have great application potential in catalyst supports, fuel cells, lithium-ion batteries, and drug delivery carriers. Therefore, the synthesis and properties of carbon nanohorns have become a hot spot in scientific...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 施祖进王志永李楠顾镇南
Owner PEKING UNIV
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