Nickel-cobalt nanoparticle and manufacturing method therefor

A manufacturing method, cobalt nanotechnology, applied in the direction of structural parts, transportation and packaging, coating, etc., can solve unclear and difficult problems, and achieve the effect of reasonable cost

Active Publication Date: 2012-12-05
NIPPON STEEL CHEMICALL &MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is unclear whether metal nanoparticles having a core-shell structure made of other dissimilar metals can be appropriately obtained using the production methods of Patent Documents 1 and 2.
Especially for dissimilar metals with similar oxidation-reduction potentials such as nickel and cobalt, it is difficult to think that the same method as in Patent Documents 1 and 2 can be applied.

Method used

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  • Nickel-cobalt nanoparticle and manufacturing method therefor
  • Nickel-cobalt nanoparticle and manufacturing method therefor
  • Nickel-cobalt nanoparticle and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] 275 mmol of oleylamine was added to 12.5 mmol of cobalt formate dihydrate and 12.5 mmol of nickel acetate tetrahydrate, and heated at 120° C. for 20 minutes under a nitrogen flow to obtain a complex reaction liquid. Next, the complex reaction solution was heated to 225° C. with microwaves, and the temperature was maintained for 30 minutes to obtain a nanoparticle slurry. The nanoparticle slurry was separated by standing, and the supernatant was removed, followed by washing with hexane three times. After that, it was dried with a vacuum dryer maintained at 60° C. for 6 hours to obtain nanoparticles.

[0098] A TEM (Transmission Electron Microscope, transmission electron microscope) photograph of the obtained nanoparticles is shown in Figure 2A , the ED (Electron diffraction: Electron diffraction) pattern is shown in Figure 2B . Spherical uniform particles with an average particle diameter of 82 nm were formed. In addition, from the ED pattern, it can be seen that t...

Embodiment 2～7、 comparative example 1～8

[0101] In Examples 2-7 and Comparative Examples 1-8, except changing the kind of nickel salt and cobalt salt and the kind of heating source and the reaction temperature (heating temperature) in the process of obtaining nanoparticle slurry, according to Example 1 to prepare nanoparticles. The results are shown in Table 1 together with Example 1. In addition, the molar ratio of oleylamine / (Ni salt+Co salt) was 10 in each of Examples and Comparative Examples. In addition, with respect to the heating method of the complexation reaction liquid, except Example 3 which used an oil bath, microwave heating was performed for all.

[0102] In addition, the results of the SQUID magnetic susceptibility measurement of the nickel-cobalt nanoparticles of Examples 1 and 2, the nickel particles of Comparative Example 8, and commercially available cobalt particles are shown in Figure 5 , the TEM photo of the nickel-cobalt nanoparticles obtained in Example 2 is shown in Figure 6 , the TEM ph...

Embodiment 8

[0107] In 12.5 mmol of cobalt formate dihydrate and 25 mmol of nickel particles with an average particle size of 100 nm and a Cv value of 0.14 (without using cobalt salts, the complexation reaction was obtained from nickel acetate tetrahydrate according to the first example above, which was heated to form The prepared particles; Comparative Example 8) were added with 125 mmol of oleylamine, and heated at 120° C. for 20 minutes under a nitrogen stream to obtain a complex reaction solution. Next, the complex reaction solution was heated to 225° C. with microwaves, and the temperature was maintained for 30 minutes to obtain a nickel-cobalt nanoparticle slurry.

[0108] The above-mentioned nickel-cobalt nanoparticle slurry was separated by standing, and after removing the supernatant, it was washed three times with hexane. Thereafter, it was dried with a vacuum dryer maintained at 60° C. for 6 hours to obtain nickel-cobalt nanoparticles. The average particle diameter of the obtai...

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Abstract

The disclosed nickel-cobalt nanoparticle includes a core, which essentially comprises nickel, and a shell, which essentially completely covers the core and essentially comprises cobalt. The disclosed method for manufacturing said nanoparticle includes: either a step in which a mixture containing a nickel salt or nickel microparticles, a cobalt salt, and a primary amine is heated to produce a reaction solution, or a step in which a mixture containing a cobalt salt and a primary amine is heated to produce a reaction solution; and a step in which the reaction solution is heated to produce a nickel-cobalt nanoparticle slurry.

Description

technical field [0001] The present invention relates to nanoparticles having a core-shell structure formed from dissimilar metals. Background technique [0002] Cobalt nanoparticles are cheaper than silver nanoparticles, chemically more stable than copper nanoparticles, and have higher catalytic activity and magnetic saturation than nickel particles, so they are used in various catalysts, magnetic materials, fuel cells, laminates Utilization in electrodes and the like in ceramic capacitors is expected. However, cobalt is a rare metal and is more expensive than nickel particles. Therefore, development of cobalt particles capable of exhibiting the performance of cobalt with a smaller amount and a method for producing the same has been desired. In order to give full play to the performance of cobalt, its particle size and particle shape must be controlled uniformly. [0003] In general, methods for producing metal nanoparticles can be broadly classified into physical methods ...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24B22F1/17
CPCB22F9/24B22F1/025B22F2999/00B22F1/17B22F1/054B22F1/056B22F2301/15B22F2303/01H01M4/00
Inventor 山内智央和田雄二塚原保德山田胜弘井上修治野本英朗川端亮次
Owner NIPPON STEEL CHEMICALL &MATERIAL CO LTD
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