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Carbon-clad metal nano particle and its preparing method

A metal nanoparticle, carbon coating technology, applied in the coating and other directions, can solve the problems of complex equipment, high impurity content, high synthesis temperature, and achieve the effect of regular metal shape, low impurity content, and complete shape

Inactive Publication Date: 2005-10-05
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

However, the equipment for preparing carbon-coated metal nanoparticles by the arc method is complicated, the synthesis temperature is high, the reaction process is difficult to control, the yield is very low, the impurity content is high, and the amount of one-time preparation is quite limited; Formation of metal carbides

Method used

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Examples

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Embodiment Construction

[0018] A method for preparing carbon-coated metal nanoparticles. First mix 2 moles of carbon nanotubes and 0.1 moles of nickel carbonyl and dissolve them in 100ml of methanol, and stir for 20-24 hours; then put the above mixture into an autoclave, add 250ml of methanol, and keep at 240-350°C for 1 After ~2 hours, cool down to room temperature with water, and release the methanol medium gas to prepare the carbon nanotube / NiO catalyst.

[0019] Then put 10 grams of carbon nanotubes / NiO catalyst into the furnace, feed argon, and when the temperature rises to 650-900°C, change the gas mixture of methane and hydrogen, the molar ratio of methane to hydrogen is 2:5, and the constant temperature is 1-900°C. In 120 minutes, carbon-coated Ni nanoparticles can be prepared. The carbon-coated Ni nanoparticles prepared in this example have low impurity content, no need for purification, high metal content, high order degree of the coated carbon layer, high temperature resistance, acid and ...

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Abstract

The present invention relates to a metal nano-material coated with carbon and its preparation method. Said preparation method includes the following steps: mixing nano carbon tube and metal organic compound according to the mole ratio of 1-50:1, adding them into organic solvent, the mole ratio of organic solvent and organic metal compound is 0-30:1, stirring for 0.5-24 hr., placing them into high-pressure kettle, making supercritical heat decomposition reaction at 150-450 deg.C, making reaction for 1-6 hr., after the reaction is completed, water-cooling to room temperature, releasing medium gas so as to obtain catalyst of nano carbon tube / metal oxide; then placing the catalyst into the furnace, introducing protective gas, heating according to the rate of 0.1-15 deg.C / min. to 650-1200 deg.C, retaining constant temperature, introducing mixed gas and retaining constant temperature for 1-180 min. so as to obtain the invented product.

Description

1. Technical field [0001] The invention belongs to the technical field of metal nanometer materials. In particular, it relates to a carbon-coated metal nanomaterial and a preparation method thereof. 2. Background technology [0002] "Carbon-encapsulated nanoparticles" or "carbon-encapsulated nanocrystals" or "graphite-encapsulated nanocrystals", also known as "carbon nanocapsules", is a new type of nanoscale material, which has unique electrical and optical properties. , magnetic properties, can be used as magnetic recording materials, electrophotographic magnetic toners, magnetic inks, nano gas sensitive materials, ferrofluids, magnetic trace elements and drug release agents, etc. Since the nano-metal particles in the carbon-coated metal nanoparticles are covered by the carbon layer, the nano-metal particles have certain resistance to air oxidation and acid-base corrosion. At the same time, since the carbon-coated metal nanoparticles have the properties of both carbon and...

Claims

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Application Information

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IPC IPC(8): B22F1/02
Inventor 李轩科苏勇雷中兴沈士德
Owner WUHAN UNIV OF SCI & TECH
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