Method for preparing nano-structure single crystal silver

A nanostructure and single crystal technology, applied in the direction of single crystal growth, nanotechnology, single crystal growth, etc., can solve the problems of low yield, complicated preparation process, single silver single crystal morphology, etc., and achieve high yield and high purity The effect of high, green synthesis method

CN102776565AInactive Publication Date: 2012-11-14SHANGHAI JIAO TONG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-11-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing nano-structure single crystal silver. The method comprises the following steps of: reducing high-conductivity forming porous activated carbon containing chloride ion, putting the activated carbon into a silver-containing precursor solution, growing nano-structure single crystal silver on the surface of the activated carbon, providing a crystal nucleus and slow and stable crystal growth environment required by growth of single crystal silver through the silver-containing precursor and proper chlorine content, and obtaining nano silver single crystal with multiple features by controlling the concentration of the solution containing the silver-containing precursor and the growth time. The method belongs to a green synthesis method, pollution is avoided, any additive is not required, and the nano-structure single crystal silver is grown on the surface of the forming porous activated carbon at room temperature; the nano-structure single crystal silver is high in productivity, high in purity and easily separated from the forming porous activated carbon, the silver is naturally stripped after growth, and the activated carbon is ultrasonically treated by absolute ethyl alcohol or alkaline liquor and can be regenerated; and the obtained single crystal silver has the characteristics of high mechanical strength, high conductivity and low crystal defect.
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Description

technical field

[0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of nanostructured single crystal silver. Background technique

[0002] Silver nanomaterials, especially single crystals, have become a current research hotspot because of their excellent electrical conductivity, heat transfer properties, specific properties in catalysis and antibacterial aspects. Nano-silver materials have broad application prospects in electronic components, optical fibers, conductive silver paste, chemical / biological sensors, chemical catalysis, conductive fillers and other fields.

[0003] At present, the preparation methods of silver nanomaterials mainly include: ball milling method, template method, liquid phase reduction method, electrochemical reduction method and so on. The ball milling method can prepare flaky silver powder, and more additives need to be added during the ball milling process. The impurit...

Examples

Embodiment 1

[0029] Prepare an ammonia solution with a mass fraction of 20%, soak the activated carbon in it for 10 minutes, take it out and dry it at 60°C; prepare a silver-ammonia solution with a concentration of 0.0001mol / L, put the pretreated activated carbon in it, and dry it at room temperature for 1 minute Finally, granular nanostructure single crystal silver grows on the surface of activated carbon. Wherein the conductivity of the activated carbon is 200S / m, and the chloride ion content is 0.01wt%.

Embodiment 2

[0031] Prepare an ammonia solution with a mass fraction of 5%, soak the activated carbon in it for 30 minutes, take it out and dry it at 80°C; prepare a silver-ammonia solution with a concentration of 0.005mol / L, put the pretreated activated carbon in it, and dry it at room temperature for 1 hour Afterwards, ribbon-shaped nanostructured single crystal silver was grown on the surface of activated carbon, and the scanning electron microscope photos are as follows: figure 1 As shown, the diffraction spot picture of transmission electron microscope is as follows image 3 shown. Wherein the conductivity of the activated carbon is 600S / m, and the chloride ion content is 0.05wt%.

Embodiment 3

[0033] Prepare an ammonia solution with a mass fraction of 10%, soak the activated carbon in it for 1 hour, take it out and dry it at 100°C; prepare a silver-ammonia solution with a concentration of 0.01mol / L, put the pretreated activated carbon in it, and dry it at room temperature for 40 minutes Afterwards, single crystal silver with zigzag nanostructure grows on the surface of activated carbon. Wherein the conductivity of the activated carbon is 800 S / m, and the chloride ion content is 0.08wt%.