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Method for reduction preparation of silver nanowire by composite solvent

A composite solvent, silver nanowire technology, applied in the field of metal powder material preparation, to achieve high yield and environment-friendly effects

Inactive Publication Date: 2006-10-11
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

How to prepare a system with low cost and stable performance without excessive inorganic salt pollution, and the method of industrial production of silver nanowires is the goal that has not yet been achieved

Method used

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  • Method for reduction preparation of silver nanowire by composite solvent
  • Method for reduction preparation of silver nanowire by composite solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a polytetrafluoroethylene reaction kettle, weigh 2.8g of template dispersant polyvinylpyrrolidone, add 100ml of glycerol, 10ml of water composite solvent, heat the temperature of the reaction kettle to 120°C, and reflux for 20 minutes; use nitric acid with a purity of 99.5% Silver is added into the mixed solution of glycerol and deionized water with a volume ratio of 1:2 and heated slightly to obtain a 1M silver nitrate solution; 60ml of this solution is used to spray the composite solvent in batches, and the speed of spraying can be 3g / m 2 .s~10g / m 2 Between .s, react at 120°C for 4 hours, separate, wash once with acetone or deionized water, and dry in vacuum. The obtained powder is subjected to physical and chemical testing to obtain 6.25 g of silver nanowires. exist figure 1 It can be seen in the silver nanowires composed of a large number of filaments with a length of tens of microns.

Embodiment 2

[0020] According to the method and dosage of Example 1, the amount of PVP was added to 11.2 g, the temperature of the reactor reached 160° C., and the reaction was carried out for 4 hours to obtain nano-silver nanowires, and the product was 6.32 g.

Embodiment 3

[0022] According to the method of Example 1, 100ml glycerol, 100ml water, PVP2.8g, spray 40ml1MAgNO 3 solution, the reaction kettle temperature is 90°C, and react for 4 hours to obtain a dark yellow silver sol with uniform silver nanowires, and the maximum visible ultraviolet absorption peak is around 420nm.

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Abstract

The invention relates to a method for using compound solvent reduction method to prepae silver nanometer wire, belonging to the technique of metallic powder preparation, with lower cost, environment protection and the application for industrial production. The method comprises: dissolving polyvinyl pyrrolidon in compound solvent whose volume ration is 1:0.1-1:1 between glycerin, and water, ethanol, isopropanol, glycol, or acetylacetone, to be heated; adding silver nitrate into the solution of glycerin and ion-exchange water whose volume is 1:2, to attain the Ag+ solution in 0.5-2.0M; using said solution to spray compound solvent and react 1 / 4-4 hours in 90-160Deg. C; collecting products; the mol percentage between the polyvinyl pyrrolidon and the Ag+ is 0.5-10; and the Ag+ solution sprays the regurgitated compound solvent in the speed of 3g / m2.s-10g / m2.s while the reaction time is 1-4 hours and the reaction temperature is 120-160Deg. C. The shape and size of particles are controlled by the ration of react matters and react condition, and said invention can attain the silver nanometer wires whose length is 5 mum-200 mum, diameter is 70-90nm, and reduced silver rate is 99%.

Description

Technical field [0001] The invention relates to a method for preparing metal powder materials. Background technique [0002] Silver nanowires generate conduction current under the action of an applied potential, have the conductivity of bulk silver, especially the unique quantum transmission effect, and have attracted much attention in the design and application of nano-optoelectronic devices. At present, silver nanowires are prepared by template method mainly through carbon nanotubes, silica templates, and molecular templates to adsorb nanoparticles and grow into nanowires through self-organization. However, there are problems such as low yield and difficult separation of product and template. In order to solve the existing problems, "A device for preparing pure silver single crystal nanowires", CN1522951, provides a DC power supply, a substrate and a silver ion conductive film deposited on it, a metal anode and a metal cathode, wherein th...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 韦群燕杨项军陈景黄章杰
Owner YUNNAN UNIV
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