Method for preparing dendritic nano-silver by liquid phase synthesis

A liquid phase synthesis, dendritic technology, applied in the field of material science, to achieve the effects of increasing electrical conductivity, increasing sterilization performance, and environmental protection and non-toxicity of reagents

Inactive Publication Date: 2009-01-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems existing in silver powder at present, the present invention provides a method for preparing dendritic nano-silver by liquid phase synthesis

Method used

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  • Method for preparing dendritic nano-silver by liquid phase synthesis
  • Method for preparing dendritic nano-silver by liquid phase synthesis
  • Method for preparing dendritic nano-silver by liquid phase synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Silver nitrate is dissolved in deionized water to prepare a silver salt solution, then the silver salt solution and ammonia solution are mixed, and the mixing ratio is according to the silver ion (Ag) in the silver salt solution. + ) and NH in ammonia solution 3 ·H 2 The molar ratio of O to Ag + : NH 3 ·H 2 O=1:2, prepared as Ag(NH 3 ) 2 Silver ammonia solution with OH concentration of 0.2mol / L.

[0033] In the prepared silver ammonia solution, add tannic acid and polyvinyl chloride pyrrolidone (PVP), stir until uniformly mixed, and prepare a reaction solution. The amount of tannic acid added is: the weight percentage of tannic acid in the silver ammonia solution It is 0.1%; the addition amount of polyvinyl chloride pyrrolidone is: the weight percent of polyvinyl chloride pyrrolidone in the silver ammonia solution is 2%.

[0034] Add ascorbic acid to deionized water to prepare a concentration of 0.8mol / L ascorbic acid solution, drop it into the reaction solution ...

Embodiment 2

[0038] Silver nitrate is dissolved in deionized water to prepare a silver salt solution, then the silver salt solution and ammonia solution are mixed, and the mixing ratio is according to the silver ion (Ag) in the silver salt solution. + ) and NH in ammonia solution 3 ·H 2 The molar ratio of O to Ag + : NH 3 ·H 2 O=1:2, prepared as Ag(NH 3 ) 2 Silver ammonia solution with OH concentration of 0.2mol / L.

[0039] In the prepared silver ammonia solution, add tannic acid and polyvinyl chloride pyrrolidone (PVP), stir until uniformly mixed, and prepare a reaction solution. The amount of tannic acid added is: the weight percentage of tannic acid in the silver ammonia solution It is 0.5%; the addition amount of polyvinyl chloride pyrrolidone is: the weight percent of polyvinyl chloride pyrrolidone in the silver ammonia solution is 0.5%.

[0040] Add ascorbic acid to deionized water to prepare a solution with a concentration of 0.7mol / L ascorbic acid, drop it into the reaction ...

Embodiment 3

[0044] Silver nitrate is dissolved in deionized water to prepare a silver salt solution, then the silver salt solution and ammonia solution are mixed, and the mixing ratio is according to the silver ion (Ag) in the silver salt solution. + ) and NH in ammonia solution 3 ·H 2 The molar ratio of O to Ag + : NH 3 ·H 2 O=1:2, prepared as Ag(NH 3 ) 2 Silver ammonia solution with an OH concentration of 0.1mol / L.

[0045] In the prepared silver ammonia solution, add tannic acid and polyvinyl chloride pyrrolidone (PVP), stir until uniformly mixed, and prepare a reaction solution. The amount of tannic acid added is: the weight percentage of tannic acid in the silver ammonia solution It is 1%; the addition amount of polyvinyl chloride pyrrolidone is: the weight percentage of polyvinyl chloride pyrrolidone in the silver ammonia solution is 0.1%.

[0046] Add ascorbic acid to deionized water to prepare a solution with a concentration of 0.6mol / L ascorbic acid, drop it into the reactio...

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Abstract

The invention relates to a method for preparing dendritic nano-silver by liquid-phase synthesis. The method is characterized by comprising the following steps: a silver-ammonia solution with silver-ammonia concentration of 0.1 mol/L to 0.5mol/L is prepared, then a crystal-formation guider and a nometer protective agent are added, stirring is carried out till the mixed solution is evenly mixed, and reaction solution is obtained; an ascorbic acid solution with concentration of 0.4mol/L to 0.8mol/L is dripped into the reaction solution to carry out reduction reaction, the solution after reaction is directly filtered by decompression, the solid phase after filtering is baked in an oven to remove water, so as to obtain the dendritic nano-silver. The method has simple preparation process, the reagent used is nontoxic and of environmental protection, the diameter of the dendritic nano-silver obtained is less than 30nm, the length of the dentrites is less than 100nm, the cluster length of the dentrites is less than 200nm, and the granularity of the dendritic nano-silver is even and the structure is stable. The dendritic nano-silver obtained by the method which is composite with polymers can improve conductivity, conductive circuit can be formed only with relatively little silver powder, filling quantity of silver powder can be reduced and cost of conductive agents can be saved.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a method for preparing dendritic nano silver by liquid phase synthesis. Background technique [0002] Silver is widely used in many fields such as microelectronics industry, sewage treatment, building materials, coatings and medical health because of its natural high electrical conductivity, sterilizing and thermal conductivity, and strong oxidation resistance. The amount of silver powder and silver flake metal consumed every year in the world is huge. Silver powders of conventional sizes currently used, such as micron silver powders, are mostly spherical in shape. The problem is that the spherical powder is easy to fall off due to the large amount of addition, and the bonding force is not good. Contents of the invention [0003] Aiming at the problems existing in silver powder at present, the invention provides a method for preparing dendritic nano-silver by liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B29/62B22F9/24
Inventor 朱一民韩跃新印万忠冯丹朱万博张馨文
Owner NORTHEASTERN UNIV
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