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Nanocomposite made of magnetic-metal-doped multiwalled carbon nanotubes/tin dioxide

A technology of multi-walled carbon nanotubes and nanocomposite materials, applied in the fields of nanocomposite materials and wave absorbing materials, can solve the problems of uncertainty of wave absorption performance of composite materials, uneven size of nanoparticles, and difficulty in guaranteeing magnetic metals, etc. Excellent absorbing performance, low reaction cost, light weight and load-bearing effect

Active Publication Date: 2016-02-17
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the prior art, the preparation of magnetic metal (Fe, Co, Ni) doping and simultaneous coating of tin dioxide (SnO2) on multi-walled carbon nanotubes (MWCNTs) 2 ) nanocomposites have many difficulties, such as the inhomogeneous size of the loaded nanoparticles and uneven coating, it is difficult to ensure the successful incorporation of magnetic metals into the composite materials, and the doping of magnetic metals (Fe, Co, Ni) has a great influence on the absorption of composite materials. There is some uncertainty about the influence of the wave properties

Method used

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  • Nanocomposite made of magnetic-metal-doped multiwalled carbon nanotubes/tin dioxide
  • Nanocomposite made of magnetic-metal-doped multiwalled carbon nanotubes/tin dioxide
  • Nanocomposite made of magnetic-metal-doped multiwalled carbon nanotubes/tin dioxide

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Embodiment 1

[0041] Ni-doped multi-walled carbon nanotubes (MWCNTs) / tin dioxide (SnO 2 ) lightweight absorbing material:

[0042] 1) Take 1g of multi-walled carbon nanotubes (MWCNTs) (>95%) in a three-necked flask, add 100mL of concentrated nitric acid (65wt%), and stir at room temperature for 15 minutes. After the stirring is completed, the three-necked flask is transferred to an oil bath, Connect the condensing tube, set the temperature of the oil bath to 140°C after the device interface is sealed, and react for 6 hours. After the reaction, the crude product is suction-filtered, washed until neutral, and dried in a vacuum oven at 60°C for 24 hour, obtain acidified multi-walled carbon nanotubes (MWCNTs);

[0043] 2) 40 mg of the multi-walled carbon nanotubes (MWCNTs) treated in step 1) was placed in 40 mL of water, and ultrasonically dispersed, and the dispersion of the multi-walled carbon nanotubes (MWCNTs) was transferred to a 50 mL reactor, and 2 g of tetrahydrate Tin chloride (SnCl ...

Embodiment 2

[0048] Magnetic metal-doped multi-walled carbon nanotubes (MWCNTs) / tin dioxide (SnO2) prepared by the present invention 2 ) nanocomposite is only the wave absorbing agent of the wave absorbing material, and the wave absorbing material is composed of the base material and the wave absorbing agent, and paraffin is the base material in the present invention.

[0049] Multi-walled carbon nanotubes (MWCNTs) and paraffin were mixed evenly at a mass ratio of 3:1, pressed into pellets, and their absorbing properties were tested with a vector network analyzer.

[0050] Tin dioxide (SnO 2 ) nanoparticles and paraffin with a mass ratio of 3:1 were mixed evenly, pressed into tablets, and the wave-absorbing performance was tested with a vector network analyzer. Tin dioxide (SnO 2 ) nanoparticles are prepared according to the following method: step 2) does not add nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O), all the other are with embodiment 1, obtain pure tin dioxide (SnO 2 )Nan...

Embodiment 3

[0053] Magnetic metal Ni doped multi-walled carbon nanotubes (MWCNTs) / tin dioxide (SnO2) prepared by the present invention 2 ) nanocomposite is only the wave absorbing agent of the wave absorbing material, and the wave absorbing material is composed of the base material and the wave absorbing agent, and paraffin is the base material in the present invention. Magnetic Ni-doped multi-walled carbon nanotubes (MWCNTs) / tin dioxide (SnO 2 ) nanocomposite material and paraffin with a mass ratio of 3:1 were mixed evenly, pressed into tablets, and the wave-absorbing performance was tested with a vector network analyzer.

[0054] Ni-doped multi-walled carbon nanotubes (MWCNTs) / tin dioxide (SnO 2 ) nanocomposite material: nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 (2) is 1.5g, all the other are with embodiment 1, and the product obtained is recorded as Ni-doped multi-walled carbon nanotubes (MWCNTs) / tin dioxide (SnO 2 )(2).

[0055] Figure 4c Ni-doped multi-walled carbon nanotub...

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Abstract

The invention discloses a nanocomposite made of magnetic-metal-doped multiwalled carbon nanotubes / tin dioxide, and the nanocomposite can be widely applied to the aspect of electromagnetic wave absorption. A preparation method of the nanocomposite comprises the following steps: 1, conducting acidificaiton on multiwalled carbon nanotubes; 2, dispersing the acidified multiwalled carbon nanotubes treated in step 1 into water, obtaining dispersion liquid of the multiwalled carbon nanotubes, adding tin tetrachloride pentahydrate, then adding nickel nitrate hexahydrate or ferric nitrate nonahydrate or cobalt nitrate hexahydrate, then adding acid, then slowly adding stronger ammonia water, adjusting pH to be 7-10, conducting a reaction for 8-24 hours at the temperature of 120-180 DEG C, and obtaining the nanocomposite made of the magnetic-metal (M)-doped multiwalled carbon nanotubes / tin dioxide through aftertreatment, wherein M represents Fe, Co and Ni, and the massic volume ratio of the acidified multiwalled carbon nanotubes to the tin tetrachloride pentahydrate to the nickel nitrate hexahydrate or the ferric nitrate nonahydrate or the cobalt nitrate hexahydrate to the acid is 0.04 g: 1-4 g: 0.5-3 g: 0.5-4 mL.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to a nano-composite material doped with magnetic metals of carbon nanotubes / tin dioxide. It belongs to the technical field of electromagnetic materials. Background technique [0002] Carbon nanotubes (CNTs) are one-dimensional nanomaterials. Since the size of their nanoparticles (1-100nm) is much smaller than the wavelength of radar waves (centimeter waves or millimeter waves), nano-stealth materials have stronger microwave absorption properties than conventional materials. Multi-walled carbon nanotubes (OD: >50nm, ID: 5-15nm, MWCNTs) have high electrical conductivity, good stealth, light weight, and loadability. Their excellent electromagnetic wave absorption properties are widely used in the field of microwave absorption. However, single multi-walled carbon nanotubes (MWCNTs) have poor dispersion and easy agglomeration defects, which affect the absorbing ability. [0003] Tin diox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 邢宏龙林玲王磊刘振峰
Owner ANHUI UNIV OF SCI & TECH
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