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A kind of three-dimensional metal nanowire and its preparation method

A metal nanowire and three-dimensional technology, which is applied in the field of nanomaterials, can solve the problems of low space utilization, nanoporous structures with large-scale structures, and difficulty in achieving highly ordered pore distribution, so as to alleviate structural collapse, The effect of increasing specific capacity and improving cycle stability

Active Publication Date: 2019-07-26
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Description
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  • Application Information

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Problems solved by technology

The dealloying method belongs to the top-down preparation method. The three-dimensional porous electrode obtained by this method has a small pore size. At the same time, it has limitations on the types of metals, and it is difficult to achieve a highly ordered pore distribution.
Nickel nanofiber non-woven fabrics with smaller size can be obtained by electrospinning fibers (diameter 300-400nm) by electroless nickel plating, but the space utilization rate is low and the pore structure is also disorderly distributed.
Most of the currently known methods for fabricating porous metal conductive framework networks still fail to obtain nanoporous structures with large-scale structural order.

Method used

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  • A kind of three-dimensional metal nanowire and its preparation method
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  • A kind of three-dimensional metal nanowire and its preparation method

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preparation example Construction

[0019] A method for preparing metal nanowires is provided in this specific embodiment, comprising the following steps:

[0020] S1, prepare a metal ion solution with a concentration of 0.01-1mol / L, add complexing agent and nucleating agent, and adjust the pH value to 10.0-13.5 with an alkali solution to prepare a solution A. Wherein, the metal ions are magnetic metal ions or a mixture of magnetic metal ions and non-magnetic metal ions.

[0021] In this step, the metal ion solution is preferably a metal salt solution. Wherein, the magnetic metal ions may be one or a mixture of divalent metal ions of nickel, cobalt and iron. The concentration of metal ions is 0.01-1 mol / L. On the one hand, if the concentration is too low, few metal nanowires can be obtained and the yield is low, which is not conducive to application. However, if the concentration is higher than 1mol / L, a large number of metal nanowires will be produced during the reduction process in the subsequent step S3. If...

Embodiment 1

[0044] (1) Preparation of metal ion solution (A solution):

[0045] Use water as a solvent to prepare 400mL of solution A at the following concentration, and use alkaline solution to adjust the pH of the solution to 12.0:

[0046] NiCl 2 0.1mol / L

[0047] Na 2 C 2 o 4 0.035mol / L

[0048] h 2 PdCl 4 0.2×10 -3 mol / L

[0049] (2) Configure strong reducing agent solution (B solution):

[0050] Prepare 400 mL of hydrazine hydrate solution with a concentration of 0.25 mol / L, and adjust the pH value to 12.5 with alkaline solution.

[0051] (3) Reduction in solution phase:

[0052]Preheat solution A and solution B in a water bath at 60°C for 30 minutes, and then mix them thoroughly. Place the titanium sheet magnetron sputtered with Pd in ​​a reaction vessel, and pour it into a polyacrylamide solution at 60°C. The A solution and the B solution were placed in a reaction container and mixed thoroughly, and reacted for 15 minutes at 60 ° C and 0.1 T under the first magnetic...

Embodiment 2

[0055] (1) Preparation of metal ion solution (A solution):

[0056] Use water as a solvent to prepare 400mL of solution A at the following concentration, and use alkaline solution to adjust the pH of the solution to 12.0:

[0057]

[0058] (2) Configure strong reducing agent solution (B solution):

[0059] Prepare 400 mL of hydrazine hydrate solution with a concentration of 0.2 mol / L, and adjust the pH value to 12.0 with alkaline solution.

[0060] (3) Reduction in solution phase:

[0061] Preheat solution A and solution B in a water bath at 50°C for 30 minutes, then mix thoroughly, place the nickel sheet of electrodeposited platinum metal in the reaction vessel, and pour it into the acrylamide-sodium acrylate copolymer solution at 50°C , put the A solution and the B solution in a reaction container and mix them well, and react for 20 minutes at 50°C and a first magnetic field direction parallel to the direction of gravity at 0.08T, and then set the direction of the magne...

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Abstract

The invention discloses a three-dimensional metal nanowire and a preparation method thereof. The preparation method includes the following steps: S1, preparing a metal ion solution with a concentration of 0.01-1 mol / L, adding a complexing agent and a nucleating agent, and adjusting the pH value to 10.0-13.5 through an alkali solution to prepare a solution; wherein, the The metal ions are magnetic metal ions or a mixture of magnetic metal ions and non-magnetic metal ions; S2, prepare a strong reductive reducing agent solution of 0.1 to 3 mol / L, adjust the alkali solution to adjust the pH value to 10.0 to 13.5, and prepare B solution ; S3, providing a reaction vessel, placing the activated substrate in the reaction vessel, fully mixing the A solution and the B solution in the reaction vessel, Under the condition of a 1T magnetic field, react for T time to prepare a reaction stock solution containing three-dimensional metal nanowires constructed of magnetic metal nanowires or alloy nanowires. The preparation method of the invention can prepare orderly arranged three-dimensional structure metal nanowires.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of nanomaterials, in particular to a three-dimensional metal nanowire and a preparation method thereof. [0003] 【Background technique】 [0004] In recent years, the academic community has made a series of attempts to develop high-performance conductive framework materials. Common nickel metal porous materials are mainly prepared by template method or dealloying method, such as commonly used nickel foam, which has an open and disordered pore structure, and the pore size is usually several hundred microns. The dealloying method belongs to the top-down preparation method. The three-dimensional porous electrode obtained by this method has a small pore size. At the same time, it has limitations on the types of metals, and it is difficult to achieve a highly ordered pore distribution. Electroless nickel plating on electrospun fibers (diameter 300-400nm) can obtain nickel nanofiber nonwovens with smaller ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/24B22F2999/00B22F1/0547B22F2202/05
Inventor 杨诚吴铛刘佳惺邹培超
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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