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Method for adopting magnetic-field self-assembling method to prepare cobalt nanowire

A metal cobalt and cobalt ion technology, applied in nanotechnology and other directions, can solve the problems of complex preparation of reaction solutions and poor product morphology, and achieve the effects of regular product morphology, easy availability of raw materials, and mild reaction conditions.

Inactive Publication Date: 2013-12-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the preparation of the reaction solution is relatively complicated and the shape of the product is poor.
However, there have been no reports at home and abroad that a simple liquid-phase chemical reduction method was used to prepare cobalt nanowires without a template.

Method used

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  • Method for adopting magnetic-field self-assembling method to prepare cobalt nanowire
  • Method for adopting magnetic-field self-assembling method to prepare cobalt nanowire
  • Method for adopting magnetic-field self-assembling method to prepare cobalt nanowire

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1. Preparation of reaction initial solution

[0022] 4.76g CoCl 2 ·6H 2 O was dissolved in 200 mL of deionized water, 7.44 g of EDTA-2Na was added, mixed well and mixed with 0.5 mol·L -1 The pH of the solution was adjusted to 12 with NaOH solution.

[0023] 2. Preparation of Cobalt Nanowires

[0024] Place the initial reaction solution prepared by the above method in an external uniform magnetic field of 25mT, heat it in a water bath to 70°C, add 6mL of hydrazine hydrate with a content of 80%, and react for 60 minutes; until the reaction is complete, separate the solution and cobalt with a permanent magnet For the nanowires, wash the cobalt nanowires twice with deionized water, absolute ethanol and acetone in sequence, dry them in vacuum at 50°C, and collect the products.

[0025] Cobalt nanowires with an average diameter of 500 nm, an average length of 40 μm, and an aspect ratio of 80 were obtained. Its appearance is attached figure 1 . The results of its compo...

Embodiment 2

[0027] 1. Preparation of reaction initial solution

[0028] 5.62g CoSO 4 ·7H 2 O was dissolved in 200 mL of deionized water, and 8.82 g of trisodium citrate was added, mixed well and then mixed with 0.5 mol L -1 The pH of the solution was adjusted to 10 with NaOH solution.

[0029] 2. Preparation of Cobalt Nanowires

[0030] Place the initial reaction solution prepared by the above method in an external uniform magnetic field of 50mT, heat it in a water bath to 60°C, add 4.30g of sodium hypophosphite, and react for 45 minutes; until the reaction is complete, use a centrifuge to separate the solution and cobalt nanowires , washed the cobalt nanowire twice with deionized water, absolute ethanol and acetone in sequence, dried in vacuum at 50°C, and collected the product.

Embodiment 3

[0032] 1. Preparation of reaction initial solution

[0033] 7.14g CoCl 2 ·6H 2 Dissolve O in 200 mL of deionized water, add 7.45g of EDTA-2Na and 5.88g of sodium tartrate, mix well and use 1 mol·L -1 The pH of the solution was adjusted to 12 with NaOH solution.

[0034] 2. Preparation of Cobalt Nanowires

[0035] Place the initial reaction solution prepared by the above method in an external uniform magnetic field of 75mT, heat it in a water bath to 50°C, add 4mL of 80% hydrazine hydrate and 0.76g of sodium borohydride, and react for 40 minutes; until the reaction is complete, use The permanent magnet separates the solution and the cobalt nanowires, washes the cobalt nanowires twice in sequence with water, absolute ethanol and acetone, and vacuum-dries them at 50°C to collect the product.

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Abstract

The invention discloses a chemical preparation method of a metal cobalt nanowire and relates to cobalt nanowire preparation, in particular to a method for adopting a magnetic-field self-assembling method to prepare the cobalt nanowire under the premise that no template is used. The method is characterized in that by utilizing constraint action of an applied magnetic field on magnetic cobalt particles, self-assembling is realized to enable the magnetic cobalt particles to grow in a uniquely-oriented manner, and the cobalt nanowire is prepared in a pure water phase. The diameter of the cobalt nanowire prepared by the method is 100-1000 nanometers, the length of the cobalt nanowire is 10.0-80.0 micrometers, the length-diameter ratio reaches 10-200, and the cobalt nanowire is composed of pure cobalt. The method has the advantages of needlessness of template pre-preparation, mild reaction condition, easy-to-get material, simple technological process and neat product shape.

Description

technical field [0001] The invention relates to the preparation of one-dimensional nanowire materials by a magnetic field self-assembly method, in particular to the preparation of cobalt nanowires. Background technique [0002] Compared with nanopowder materials, one-dimensional nanowire (rod) materials have excellent properties such as ultra-high mechanical strength, thermoelectric properties, luminous efficiency, catalytic properties, and magnetic properties due to their specific geometric shapes. , properties and applications of nanotechnology is an important field of science and technology. [0003] At present, the preparation methods of metal cobalt nanowires are template methods. According to "Science" 2001, 291: 2115-2117, a mixture of trioctylphosphine oxide (TOPO) and oleic acid was used as a surfactant (soft template), and o-dichlorobenzene was used as a solvent to thermally decompose Co 2 (CO) 8 Cobalt nanorods are prepared, the diameter of which is 4-25nm. T...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 廖立黎明谢克难
Owner SICHUAN UNIV
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