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Chemical preparation method of metal cobalt nanowire

A technology of cobalt nanowires and metal cobalt, which is applied in the field of preparation of metal cobalt powder, can solve the problems of large powder particles, long reaction time, poor shape controllability, etc., and achieve simple process, mild reaction conditions and low production cost Effect

Inactive Publication Date: 2010-04-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cobalt powder prepared by this method is relatively uniform, the cobalt powder is obviously spherical, and has the disadvantages of long reaction time, poor shape controllability, and large particles of the prepared powder.

Method used

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  • Chemical preparation method of metal cobalt nanowire
  • Chemical preparation method of metal cobalt nanowire
  • Chemical preparation method of metal cobalt nanowire

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. Preparation of reaction solution:

[0024] Use ethylene glycol as solvent to prepare solutions in the following proportions.

[0025] CoCl 2 0.013mol / L

[0026] NaOH 0.05mol / L

[0027] PVP k30 10.0g / L

[0028] Reaction temperature 50°C

[0029] Magnetic stirring time 20 minutes

[0030] 2. Cobalt nanowire preparation:

[0031] ①Heat the solution prepared by the above method to 140°C;

[0032] ② Add hydrazine hydrate 50ml / L dropwise;

[0033] ③React for 20 minutes until the reaction is complete;

[0034] ④ centrifugal separation solution and cobalt nanowire;

[0035] ⑤ Wash the cobalt nanowires 3 times with absolute ethanol;

[0036] ⑥ dry collection.

[0037] Nano cobalt powder with an average length of 5.0 μm, an average diameter of 200 nm and an aspect ratio of 25 was obtained. It looks like figure 1 shown.

Embodiment 2

[0039] 1. Preparation of reaction solution:

[0040] Use ethylene glycol as solvent to prepare solutions in the following proportions.

[0041] CoCl 2 0.05mol / L

[0042] NaOH 0.05mol / L

[0043] PVP k30 10.0g / L

[0044] Reaction temperature 50°C

[0045] Magnetic stirring for 20 minutes

[0046] 2. Preparation of cobalt nano powder:

[0047] ① Place the solution prepared by the above method in a water bath at 95°C;

[0048] ② Add hydrazine hydrate 20ml / L dropwise

[0049] ③React for 30 minutes until the reaction is complete;

[0050] ④ centrifugal separation solution and cobalt nanowire;

[0051] ⑤ Wash the cobalt nanowires 3 times with absolute ethanol;

[0052] ⑥ dry collection.

[0053] Nano cobalt powder with an average length of 6 μm, an average diameter of 250 nm, and an aspect ratio of 24 was obtained. It looks like figure 2 shown.

Embodiment 3

[0055] 1. Preparation of reaction solution:

[0056] Use ethylene glycol as solvent to prepare solutions in the following proportions.

[0057] CoSO 4 0.02mol / L

[0058] NaOH 0.04mol / L

[0059] PVP k90 10.0g / L

[0060] Reaction temperature 60°C

[0061] Magnetic stirring for 30 minutes

[0062] 2. Preparation of cobalt nano powder:

[0063] ①Heat the solution prepared by the above method to 120°C;

[0064] ② Add hydrazine hydrate 30ml / L dropwise;

[0065] ③ React for 20 minutes;

[0066] ④ centrifugal separation solution and cobalt nanowire;

[0067] ⑤ Wash the cobalt nanowires 3 times with absolute ethanol;

[0068] ⑥ dry collection.

[0069]Nano cobalt powder with an average length of 2.0 μm, an average diameter of 163 nm and an aspect ratio of 13.4 was obtained. It looks like image 3 shown.

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Abstract

The invention discloses a chemical preparation method of a metal cobalt nanowire, relating to a preparation method of metal cobalt powder. The method adopts a soft mould method to prepare the metal cobalt nanowire in a self-assembly way. The method is characterized of comprising the steps of: jointly forming into the soft mould with ethanediol and surface active agent; taking hydrazine hydrate as reducing agent to reduce cobalt ions in cobalt salt into cobalt atoms; and directionally growing cobalt crystal nucleus under the function of the soft mould to form into linear shape. The diameter of the prepared cobalt nanowire is 100-800 nm, length is 2.0-10.0 um, length-diameter ratio is 12-25, and powder is pure cobalt. The method has simple technology and low cost, can realize large-scale economic preparation, and provides precondition for the practical use of the cobalt nanowire.

Description

technical field [0001] The invention relates to the preparation of one-dimensional nano powder material by chemical method, in particular to the preparation of metal cobalt powder. Background technique [0002] Nano cobalt powder is a powder material with a wide range of uses. Due to its high surface activity, high surface purity, no microporous leakage, large specific surface area, great surface effect and volume effect, and wide application prospects in catalytic materials, electronic materials, magnetic materials, etc., it is increasingly received people's attention. One-dimensional nanomaterials exhibit many excellent and unique properties, such as super mechanical strength, higher luminous efficiency, enhanced thermoelectric properties, etc. The research on them is a very active field in the field of nanotechnology. Assembling one-dimensional nanomaterials into aggregates with specific geometric shapes, or confining them to achieve specific orientations will bring som...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 孙冬柏俞宏英张冰聪孟惠民
Owner UNIV OF SCI & TECH BEIJING
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