Preparation method of carbon-coated metallic nano-particles

A metal nanoparticle and carbon coating technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problems of metal toxicity, limited application, reduced magnetism and dispersibility, and achieve high degree of graphitization and large specific surface area , the effect of simple operation

Inactive Publication Date: 2012-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these nanoparticles have the following outstanding problems: (1) easily oxidized in air; (2) inherently unstable, metal nanoparticles agglomerate in order to reduce their surface energy, thereby reducing their magnetic properties and dispersibility; ( 3) Some metals are toxic, which greatly limits their application in the biological field
However, in most of the above methods, the metal source and carbon source are directly mixed and calcined at high temperature to prepare carbon-coated metal nanoparticles. The obtained carbon-coated metal nanoparticles have poor particle size uniformity and the yield is still small.

Method used

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  • Preparation method of carbon-coated metallic nano-particles
  • Preparation method of carbon-coated metallic nano-particles
  • Preparation method of carbon-coated metallic nano-particles

Examples

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Embodiment 1

[0030] Weigh 1.2g of glucose, 0.808g of ferric nitrate and 11.1g of NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve with a magnetic stirrer at a stirring speed of 300r / min to form a solution, and then use a 400W ultrasonic Sonicate for 15min and mix well. The mixed solution was added into a petri dish, and the petri dish was put into a vacuum drying oven at 80° C. for vacuum drying until the mixture was obtained. Grind the mixture, take 2g of the mixed powder and place it in the ark, put the ark into the tube furnace, first pass 200ml / min of Ar inert gas to remove the air, then use 100ml / min of Ar inert gas, and at 10°C / min The heating rate of min is raised to 300°C to decompose the carbon source, and after holding for 1 hour; then continue to pass in Ar inert gas with a flow rate of 100ml / min, and raise the temperature to 700°C at a heating rate of 10°C / min, and hold for 2 hours. Carbonization, cooling to room temperature under the protection of Ar a...

Embodiment 2

[0032] Weigh 1.2g of glucose, 0.808g of ferric nitrate and 11.1g of NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve with a magnetic stirrer at a stirring speed of 300r / min to form a solution, and then use a 400W ultrasonic Sonicate for 15min and mix well. The mixed solution was added into a petri dish, and the petri dish was put into a vacuum drying oven at 80° C. for vacuum drying until the mixture was dried. Grind the mixture, take 2g of the mixed powder and place it in the ark, put the ark into the tube furnace, first pass 200ml / min of Ar inert gas to remove the air, then use 100ml / min of Ar inert gas, and at 10°C / min The heating rate of min is raised to 300°C for carbon source decomposition, and after holding for 1 hour; then continue to pass in Ar inert gas with a flow rate of 100ml / min, and raise the temperature to 750°C at a heating rate of 10°C / min, and hold for 2 hours. Carbonization, cooling to room temperature under the protection of Ar atm...

Embodiment 3

[0034]Weigh 1.2g of glucose, 0.808g of ferric nitrate and 11.1g of NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve with a magnetic stirrer at a stirring speed of 300r / min to form a solution, and then use a 400W ultrasonic Sonicate for 15 minutes and mix well. The mixed solution was added into a petri dish, and the petri dish was put into a vacuum drying oven at 80° C. for vacuum drying until the mixture was obtained. Grind the mixture, take 2g of the mixed powder and place it in the ark, put the ark into the tube furnace, first pass 200ml / min of Ar inert gas to remove the air, then use 100ml / min of Ar inert gas, and at 10°C / min The heating rate of min is raised to 300°C for carbon source decomposition, and after holding for 1 hour; then continue to pass in Ar inert gas with a flow rate of 100ml / min, and raise the temperature to 800°C at a heating rate of 10°C / min, and hold for 2 hours. Carbonization, after the reaction is completed, it is cooled to ro...

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Abstract

The invention discloses a preparation method of carbon-coated metallic nano-particles, which comprises the steps that: NaCl serves as dispersant and a carrier, and is fully mixed with a metal source and a solid carbon source; the mixed solution is dried under a vacuum condition, and mixture is obtained; the mixture is put into a tubular furnace and calcinated in the inertial / reduction atmosphere, and a calcinated product is obtained; and the calcinated product is washed and ground, and the carbon-coated metallic nano-particles are obtained. The method is safe, non-toxic, environmental-friendly and simple to operate, so that the grain sizes of the prepared carbon-coated nano-particles are controlled to be 0nm to 100nm, the graphitization degree of a carbon layer is high, the dispersion of the particles is good, and the yield is high. The carbon-coated metallic nano-particles which are prepared through the preparation method have better magnetism and larger specific surface areas, can be used for electronic and magnetic materials, and can be used for magnetic resonance imaging, targeted drug transportation and other fields through functionalization treatment and other steps.

Description

technical field [0001] The invention relates to a preparation method of carbon-coated metal nanoparticles, which belongs to the composite material technology of carbon and metal. Background technique [0002] Nanocomposites are very important nanomaterials, among which magnetic nanocomposites have received extensive attention and research in recent years. The carbon-coated metal magnetic nanocomposites with core-shell structure realize the multifunctionality and separability of the material. The carbon-coated metal nanoparticles are composed of a magnetic metal nano-core and an inert cladding layer (C layer). [0003] Magnetic metal nanoparticles have broad application prospects in the fields of magnetic fluids, catalysts, biotechnology / biomedical medicine, electromagnetic wave absorption, magnetic recording / thermotherapy, magnetic resonance imaging, and targeted drug delivery. However, these nanoparticles have the following outstanding problems: (1) easily oxidized in air...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 何春年吴珊赵乃勤师春生刘恩佐
Owner TIANJIN UNIV
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