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Method for preparing non-metallic element doped carbon coated metal nanoparticle magnetic composite

A technology of metal nanoparticles and magnetic composite materials, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of inability to pyrolyze metal precursors, non-metal element doping, and non-magnetic carbon-coated materials , to achieve the effect of high degree of graphitization, large specific surface area and good dispersion

Active Publication Date: 2016-04-13
合肥庐阳科技创新集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to provide a method for preparing a non-metallic element-doped carbon-coated metal nanoparticle magnetic composite material. Technical problems such as non-magnetic coating materials and non-metal element doping have not been realized

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  • Method for preparing non-metallic element doped carbon coated metal nanoparticle magnetic composite
  • Method for preparing non-metallic element doped carbon coated metal nanoparticle magnetic composite
  • Method for preparing non-metallic element doped carbon coated metal nanoparticle magnetic composite

Examples

Experimental program
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Embodiment 1

[0032] (1) Weigh 10.09g (120mmol) dicyandiamide (C 2 h 4 N 4 ) and 2.445g (8.4mmol) cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2O) add in the beaker that contains 300mL methanol solution, continue to stir 20min under the condition of 50 ℃, obtain homogeneous phase clear solution; Obtain homogeneous phase powder after homogeneous phase clear solution is dried, grind; Homogeneous phase powder is placed in quartz tube, Place the quartz tube in the uniform temperature zone of the tubular resistance furnace, raise the temperature to 500°C at a rate of 10°C / min in a nitrogen atmosphere with a flow rate of 0.2mL / min, and keep the temperature constant for 2 hours; then raise the temperature to 700°C, and keep the temperature for 2 hours. hour; after the reaction was finished, the quartz tube was cooled to room temperature in a nitrogen atmosphere to obtain a black powder;

[0033] (2) Put the black powder obtained in step (1) in a beaker, add 300mL of 0.5mol / L sulfuric acid solu...

Embodiment 2

[0039] The preparation method of this embodiment is the same as that of Example 1, the only difference is that the water-soluble metal M 2+ Salt selection 1.670g (8.4mmol) ferrous chloride tetrahydrate (FeCl 2 4H 2 O) to replace cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O), obtained nitrogen-doped carbon-coated iron nanoparticles magnetic composite material.

[0040] The mass of the composite material obtained in this example is ~1.6 g, and the doping rate of nitrogen is ~8%.

[0041] Figure 6 For the XRD diffraction pattern of the nitrogen-doped carbon-coated iron nanoparticle magnetic composite material prepared in this example, it can be seen from the figure that the diffraction peak corresponding to 26 ° is graphite carbon, and the remaining three diffraction peaks correspond to simple substance Iron; there are no other diffraction peaks in the spectrum, indicating that the composite material is of high purity without any impurities.

[0042] Figure 7 The XPS...

Embodiment 3

[0044] The preparation method of this embodiment is the same as that of Example 1, the only difference is that the water-soluble metal M 2+ Salt selection 1.997g (8.4mmol) nickel chloride hexahydrate (NiCl 2 ·6H 2 O) to replace cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) to prepare nitrogen-doped carbon-coated nickel nanoparticle magnetic composite material.

[0045] The mass of the composite material prepared in this embodiment is ~1.3g, and the doping rate of nitrogen is ~7%.

[0046] Figure 8 For the XRD diffraction pattern of the nitrogen-doped carbon-coated nickel nanoparticle magnetic composite material prepared in this example, it can be seen from the figure that the diffraction peak corresponding to 26 ° is graphite carbon, and the remaining three diffraction peaks correspond to simple substance Nickel; there are no other diffraction peaks in the spectrum, indicating that the composite material is of high purity without any impurities.

[0047] Figure 9 ...

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Abstract

The invention discloses a method for preparing a non-metallic element doped carbon coated metal nanoparticle magnetic composite. The method comprises the steps that water-soluble metal divalent salt, a cyanamide compound and a nitrogen or boron or sulfur containing non-metallic compound are added into a methanol solution to be mixed, dissolved, dried and ground, and obtained homogeneous-phase powder is subjected to roasting pyrolysis under the protection of inert gas; and a pyrolysis product is subjected to acid pickling, washing, drying and grinding, and a target product is obtained. According to the whole preparing process of the method, metal ion reduction, metal nanoparticle coating and doping of nitrogen / boron / sulfur and other non-metallic elements are achieved in one step. The composite prepared through the method is high in degree of graphitization, good in dispersity between particles and high in purity, and the preparing method has the advantages that the cost is low, the process is simple, and large-quantity synthesis can be easily achieved.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of carbon nanomaterials, and in particular relates to a preparation method of a nonmetallic element-doped carbon-coated metal nanoparticle magnetic composite material. Background technique [0002] Magnetic metal nanoparticles show great application prospects in ultra-high density information storage, catalysis, giant magnetoresistance, magneto-optic materials, and biomedicine. However, metal nanoparticles have high reactivity and are easy to oxidize and agglomerate in the air. Some metals are toxic and mix with aqueous solutions to cause water pollution. Therefore, how to obtain stable magnetic metal nanoparticles has become a research hotspot. Carbon-coated magnetic metal nanoparticle materials, because the nano-metal particles are at the core of the coating structure, are imprisoned in a small space by the carbon shell, thereby avoiding the influence of the environment on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/30B22F9/24
CPCB22F9/24B22F9/30B22F1/16
Inventor 姚运金陈浩连超魏凤玉张大伟吴国东
Owner 合肥庐阳科技创新集团有限公司
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