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Process for preparing tree-shaped carbon nano tube

A carbon nanotube and dendritic technology, applied in the field of preparation of nanomaterials, can solve problems such as dendritic carbon nanotubes that have not yet been seen, and achieve the effects of easy operation, low cost and uniform diameter distribution.

Inactive Publication Date: 2004-10-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there have been no reports on dendritic carbon nanotubes containing two-dimensional and three-dimensional junctions

Method used

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  • Process for preparing tree-shaped carbon nano tube
  • Process for preparing tree-shaped carbon nano tube
  • Process for preparing tree-shaped carbon nano tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Dissolve 0.356 g of cobalt nitrate hexahydrate in 50 ml of absolute ethanol, and then add 5 g of magnesium oxide powder. The mixture was sonicated for 1 hour to homogenize the solution. The solvent was then removed by a rotary evaporator, followed by drying at 130° C. for 13 hours to obtain a completely dried catalyst. The dried solid mixture is ground into a finer powder. In this way, a catalyst containing 1.25% by weight of cobalt element is obtained. The device shown in the picture (the tube furnace is produced by Beijing Electric Furnace Factory, the model is SK 2 -4-13), place a quartz boat (5 milliliters) containing 2 grams of the above-mentioned catalyst in the middle of the quartz tube, connect the gas distribution system, feed hydrogen at a flow rate of 300 milliliters per minute, and set the temperature to 1000 °C, quickly raise the temperature to 1000 °C (within 12 minutes), and feed methane gas at a flow rate of 75 ml per minute. After 10 minute...

Embodiment 2

[0028] Example 2 According to the preparation method of Example 1, only the mass of cobalt nitrate hexahydrate was replaced by 0.712 g to obtain a 2.5% catalyst, and a product containing 80% of dendritic carbon nanotubes was obtained by using the catalyst.

Embodiment 3

[0029] Example 3 According to the preparation method of Example 2, only the mixed total gas flow rate is adjusted to 300 milliliters per minute, the volume ratio of hydrogen and methane is adjusted to 4: 1, and the obtained diameter is a dendritic carbon nanotube with a diameter of 52 nanometers And its content reaches 75%.

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Abstract

The preparation process of dendriform carbon nanotube includes following steps: preparing catalyst through dissolving cobalt salt in alcohol, soaking magnesia as catalyst carrier in the alcohol solution of cobalt salt, ultrasonic dispersion, evaporating, drying and crushing; and preparing dendriform carbon nanotube through set quartz boat holding the catalyst inside quartz tube, leading in hydrogen to eliminate air in the reaction system, heating to 850-1100 deg.c, leading in methane for reaction, cooling in hydrogen atmosphere, acidifying, washing, and vacuum drying. The process is suitable for industrial production, and the prepared dendriform carbon nanotube has special electrical and dynamic properties and is one ideal material for constituting nano devices.

Description

Technical field: [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing dendritic carbon nanotubes. Background technique: [0002] Due to its unique electrical and mechanical properties, carbon nanotubes have great potential as special functional and nano-device materials. Like microelectronic devices, nanometer devices will also use various heterostructures as building blocks. Theoretical and experimental studies have shown that: depending on the diameter and helicity, carbon nanotubes exhibit a series of electrical properties from semiconductors to metals (Odom, T.W.; Huang, J.-L.; Kim, P.; Lieber, C.M.J. Phys .Chem.B 2000, 104, 2794.), it can be seen that connecting two linear carbon nanotubes with different electrical properties will produce a heterojunction, which is of great importance for the construction of nano-devices based on carbon nanotubes. significance. At present, there are two methods for prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 刘云圻胡平安王贤保王彪朱道本
Owner INST OF CHEM CHINESE ACAD OF SCI
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