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A kind of copper-silver alloy nano sheet and preparation method thereof

A copper-silver alloy and nanosheet technology, applied in nanotechnology and other directions, can solve the problems of silver homogeneous nucleation, simple preparation process, fast reaction speed, etc., and achieve green and mild reaction conditions, good dispersibility, and high monodispersity. Effect

Active Publication Date: 2018-04-17
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of introducing reducing agent is usually also used to promote the reduction of silver ions to obtain a uniform and dense silver coating layer with a certain thickness, but adding reducing agent will easily lead to the homogeneous nucleation of silver, which is difficult to control, and the silver plating solution Poor stability, which reduces the use efficiency and coating effect of silver
The related technology discloses a preparation method of electroless silver-plated copper powder modified by rare earth. Before the copper powder is plated, the methods of cleaning, activation, sensitization and ultrasonic assistance are used. The process is relatively complicated and the cost is high.
A preparation method of conductive composite copper powder is disclosed in the related art. In this method, silver ions are reduced to simple silver by introducing a reducing agent and deposited on the surface of copper powder to form a coating structure. Strong reducing agents such as formaldehyde and hydrazine hydrate are used to make The reaction speed is fast, and it is not easy to reduce the spontaneous nucleation and growth of silver, which reduces the use efficiency of silver
[0004] At present, there is no report on the preparation of copper-silver alloy nanomaterials that has a simple preparation process, low cost, and can be applied to large-scale production.

Method used

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  • A kind of copper-silver alloy nano sheet and preparation method thereof
  • A kind of copper-silver alloy nano sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 0.24g of 100nm spherical copper particles into 50ml of ethylene glycol, add 1.95g of polyethylene glycol-2000, stir evenly and heat to 100°C to obtain solution a; add 0.11g of silver nitrate to 10ml of ethanol, and ultrasonically obtain at room temperature Solution b: add solution b to solution a, continue to stir for 120 minutes, then cool to room temperature, centrifuge and wash 4 times with 8000r / min deionized water, take the precipitate and dry it at room temperature for 6 hours under the condition that the vacuum degree is less than 0.01MPa to obtain copper-silver alloy material .

[0027] Get the above-mentioned obtained nanomaterial, adopt X-ray diffractometer (XRD) to carry out phase spectrum analysis to it, adopt field emission scanning electron microscope (SEM) to observe the morphology of particle, the result is as follows figure 1 and figure 2 shown. from figure 1 The characteristic peaks of metal copper and silver can be seen in , without any chara...

Embodiment 2

[0029] Add 0.67g of 400nm spherical copper particles into 100ml of glycerol, add 5.45g of polyvinylpyrrolidone, stir evenly and heat to 120°C to obtain solution a; add 1.22g of silver nitrate to 18ml of water, and ultrasonically obtain solution b at room temperature; Add solution b into solution a, continue to stir for 180 min, then cool to room temperature, centrifuge and wash 4 times with 5000 r / min deionized water, take the precipitate and dry it at room temperature for 8 h under the condition of vacuum degree less than 0.01 MPa to obtain copper-silver alloy material.

[0030] The XRD pattern and the SEM pattern of the prepared copper-silver alloy nanosheet are similar to those in Example 1, showing that the phase of the nano-copper is metallic copper and silver, without other impurities; the particle size is uniform, good dispersion, no obvious reunion phenomenon.

Embodiment 3

[0032] Add 0.08g of 50nm spherical copper particles into 50ml of diethylene glycol, add 0.58g of polyvinyl alcohol, stir evenly and heat to 50°C to obtain solution a; add 0.25g of silver nitrate to 10ml of water, and ultrasonically obtain the solution at room temperature b; add solution b to solution a, continue to stir for 300 minutes, then cool to room temperature, centrifuge and wash 4 times with 3000r / min deionized water, take the precipitate and dry it at room temperature for 12 hours under the condition of vacuum degree less than 0.01MPa to obtain copper-silver alloy material.

[0033] The XRD pattern and the SEM pattern of the prepared copper-silver alloy nanosheet are similar to those in Example 1, showing that the phase of the nano-copper is metallic copper and silver, without other impurities; the particle size is uniform, good dispersion, no obvious reunion phenomenon.

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Abstract

The invention provides a copper and silver alloy nanosheet and a preparation method thereof. The preparation method includes the following steps that a copper source is added to solvent A, a protective agent is added, the mixture is stirred to be uniform and then heated to 50-160 DEG C, and a solution a is obtained; a silver source is added to solvent B, and a solution b is obtained through ultrasound; the solution b is added to the solution a, stirring is continued for 5 minutes to 5 hours, then cooling and centrifugation are conducted, sediment is taken and washed, then vacuum drying is conducted, and a copper and silver alloy material is obtained; the molar ratio of the copper source to the silver source to the protective agent is 1:( 0.1-10):(1-20). According to the copper and silver alloy nanosheet and the preparation method thereof, water or ethyl alcohol or polyhydric alcohol serve as the solvent, spherical copper particles serve as the copper source, the protective agent is cheap and easy to obtain, the reaction condition is environmentally friendly and mild, the dispensability of the generated alloy nanosheet is good, the single dispersion degree is high, a certain degree of oxidation resistance is achieved, and the copper and silver alloy nanosheet and the preparation method thereof can be applied to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of nanometer metal materials, in particular to a copper-silver alloy nanosheet and a preparation method thereof. Background technique [0002] Bimetal composite nanomaterials have better physical and chemical properties than a single component, so they have attracted the attention of various researchers. The copper-silver bimetal composite powder can not only solve the electromigration problem of silver, reduce the cost of silver powder, but also improve the conductivity and oxidation resistance of copper particles. Therefore, copper-silver composite powder can partially replace silver powder in the fields of conductive paste, catalyst, antibacterial material, etc., and has a broad application prospect. At present, regarding the preparation of copper-silver composite materials, Japan, Germany, the United States, South Korea and other countries have great advantages in product variety and quality compared wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 张昱朱朋莉李刚赵涛孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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