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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 effect of preventing shedding, environmentally friendly and non-toxic reagents, and increasing electrical conductivity

Inactive Publication Date: 2011-05-25
NORTHEASTERN UNIV LIAONING
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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 silver ammonia solution of preparation, add tannic acid and polyvinylpyrrolidone (PVP), stir until mixing, prepare reaction solution, the addition of tannic acid is: the weight percent of tannic acid in silver ammonia solution is 0.1%; the addition amount of polyvinylpyrrolidone is: the weight percent of polyvinylpyrrolidone 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 at 20°C and a stirring speed of 200r / min for reductio...

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 silver ammonia solution of preparation, add tannic acid and polyvinylpyrrolidone (PVP), stir until mixing, prepare reaction solution, the addition of tannic acid is: the weight percent of tannic acid in silver ammonia solution is 0.5%; the addition amount of polyvinylpyrrolidone is: the weight percent of polyvinylpyrrolidone 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 solution at 22°C and a stirring speed of 220r / min for...

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 silver ammonia solution of preparation, add tannic acid and polyvinylpyrrolidone (PVP), stir until mixing, prepare reaction solution, the addition of tannic acid is: the weight percent of tannic acid in silver ammonia solution is 1%; the amount of polyvinylpyrrolidone added is: the weight percentage of polyvinylpyrrolidone 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 reaction solution at 25°C and a stirring speed of 180r / min for...

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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 reactionis 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 thedentrites 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 Patents(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 LIAONING
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