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Carbon nanotube encapsulated cobalt and oxide nanosphere absorbing material thereof and preparation method thereof

A technology of carbon nanotubes and wave-absorbing materials, applied in magnetic/electric field shielding, electrical components, etc., can solve problems such as practical difficulties, difficulties, and complexity of preparation processes, and achieve controllable shape, good effect, and good electromagnetic wave absorption effect of effect

Inactive Publication Date: 2018-01-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the development of electromagnetic wave absorbing materials, in addition to the above-mentioned basic requirements of lightness, thinness, strength, and width, people have put forward more specific requirements for the shortcomings in this field, such as the cost of raw materials. The reason why graphene and carbon nanotube materials, which are relatively hot, have not been commercialized in large quantities is mainly due to their cost. Using them as raw materials for the preparation of electromagnetic wave absorbers will undoubtedly increase the difficulty of practical application. Some metals and their oxides The preparation of nano-particles also faces the same problem. Another problem is the complexity of the preparation process. Some studies use methods such as chemical vapor deposition to conduct experiments, which also increases practical difficulties.

Method used

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  • Carbon nanotube encapsulated cobalt and oxide nanosphere absorbing material thereof and preparation method thereof
  • Carbon nanotube encapsulated cobalt and oxide nanosphere absorbing material thereof and preparation method thereof
  • Carbon nanotube encapsulated cobalt and oxide nanosphere absorbing material thereof and preparation method thereof

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Effect test

Embodiment 1

[0034] Dissolve 1.2g of cobalt nitrate hexahydrate in 24g of methanol solution, called solution A, and dissolve 0.03g of cetyltrimethylammonium bromide and 1.5g of 2-methylimidazole in 24g of methanol solution, called solution B, Solution A was added dropwise to solution B under stirring, stirred for 2 hours, washed with methanol by centrifugation, and dried in an oven at 60°C for 6 hours to obtain nano-sized ZIF-67 with a product mass of 1.17 g.

[0035] Put the prepared nanometer-sized ZIF-67 into a tube furnace, rise to 400°C at 0.5°C / min under the protection condition of nitrogen-hydrogen mixed gas (10% volume hydrogen), keep the temperature for 1 hour, and then naturally cool to room temperature to obtain carbon Nanotube-encapsulated cobalt and its oxide nanosphere absorbing material, the product quality is 587mg. figure 1 A scanning electron micrograph of nanometer-sized ZIF-67 is given, which is a rhombic dodecahedral structure with a size of about 600 nanometers. fig...

Embodiment 2

[0038] Dissolve 1.7g of cobalt nitrate hexahydrate in 32g of methanol solution, called solution A, and dissolve 0.03g of cetyltrimethylammonium bromide and 1.9g of 2-methylimidazole in 32g of methanol solution, called solution B, Solution A was added dropwise into solution B under stirring, stirred for 6 hours, washed by centrifugation, and dried in an oven at 60°C for 6 hours. Nano-sized ZIF-67 was obtained with a product mass of 1.7 g.

[0039] Put the prepared nano-sized ZIF-67 into a tube furnace, raise it to 500°C at 1°C / min under the protection condition of nitrogen-hydrogen mixed gas (10% volume hydrogen), keep the temperature at a constant temperature for 2 hours, and naturally cool to room temperature to obtain the product carbon Nanotube-encapsulated cobalt and its oxide nanosphere absorbing material, the product quality is 839mg.

[0040] Figure 8 A scanning electron microscope photo of nanometer-sized ZIF-67 is given, which is a rhombic dodecahedron with a size ...

Embodiment 3

[0043] Dissolve 3.2g of cobalt nitrate hexahydrate in 60g of methanol solution, called solution A, and dissolve 0.04g of cetyltrimethylammonium bromide and 3.6g of 2-methylimidazole in 60g of methanol solution, called solution B, Solution A was added dropwise to solution B under stirring, stirred for 12 hours, washed by centrifugation, and dried in an oven at 60°C for 6 hours. Nano-sized ZIF-67 was obtained with a product mass of 2.98 g.

[0044] Put the prepared nanometer-sized ZIF-67 into a tube furnace, raise it to 600°C at 5°C / min under the protection condition of nitrogen-hydrogen mixed gas (10% volume hydrogen), keep the temperature at a constant temperature for 5 hours, and naturally cool to room temperature to obtain the product carbon Nanotube-encapsulated cobalt and its oxide nanosphere absorbing material, the product mass is 1.03g.

[0045] Figure 15 A scanning electron micrograph of nanometer-sized ZIF-67 is given, which is a rhombic dodecahedron with a size of ...

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Abstract

The present invention relates to a carbon nanotube encapsulated cobalt and oxide (CoO and Co3O4) nanosphere absorbing material thereof and a preparation method thereof, and belongs to the electromagnetic wave absorbing material technology field. The micro-morphology of the absorbing material is a hollow rhombic dodecahedron structure composed of the carbon materials, the carbon nanotubes grow on the surface of the rhombic dodecahedron structure, and a cobalt and an oxide nanosphere thereof are encapsulated at the end at the outer side of each carbon nanotube. The size of the rhombic dodecahedron structure is 400-550nm, the external diameter of each carbon nanotube is 14-16 nm, and the internal diameter is 11-13 nm; the diameters of the cobalt and the oxide nanosphere thereof are 11-13 nm,the proportion of the amorphous carbon and the graphitized carbon in the absorbing material is 1: 0.79-1.17, and the saturation magnetization intensity of the absorbing material is 27.83-39.4 emu / g; the maximum electromagnetic wave absorption exceeds -40 dB, and an effective absorption range exceeds 4.5 GHz. After using the 1M sulfuric acid or 1M ammonia to process 6-12 hours, the maximum electromagnetic absorption of the absorbing material still exceeds -40 dB, and the effective absorption range exceeds 4.5 GHz, thereby having the immense potential at the aspect of the electromagnetic wave absorbing material.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, in particular to a carbon nanotube-encapsulated cobalt and its oxides (CoO and Co 3 o 4 ) nanosphere wave-absorbing material and its preparation method. Background technique [0002] The discovery of electromagnetic waves has greatly promoted the progress of human technology. The environment we live in is full of various electromagnetic waves, and they play an extremely important role in today's society. Modern technology is developing towards the trend of wireless, more and more electronic devices have begun to introduce wireless transmission technology, mobile phones, WIFI, Bluetooth, NFC, radar detection, wireless charging, etc., some have been realized and entered our daily life In life, some things still need to be further developed, and some are just a concept, which will be more convenient for our lives after the technology matures. In any case, people's...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 施展梁晨李春光
Owner JILIN UNIV
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