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Method for manufacturing silver nanowires

A technology of silver nanowires and silver salts, which is applied in the field of preparation of silver nanowires, can solve problems such as the inability to form silver nanowires in series, complex post-processing, and large sewage problems, and achieve large-scale production, convenient operation, and good repeatability

Active Publication Date: 2013-07-17
苏州冷石纳米材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can effectively prepare silver nanowires, most of these methods involve high viscosity, high boiling point and non-environmentally friendly organic solvents in the production process, the post-treatment process is complicated, and it is easy to cause environmental pollution problems, especially It is a relatively large pollution problem when mass production; at the same time, few of these existing methods can regulate the length and diameter of silver nanowires in a large range, so it is impossible to form a serialization of silver nanowire preparation.

Method used

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  • Method for manufacturing silver nanowires
  • Method for manufacturing silver nanowires

Examples

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Embodiment 1

[0050] A method for preparing silver nanowires, comprising the steps of: (1) taking 1 gram of potassium chloride, 1 gram of polyvinylpyrrolidone, and adding 0.5 gram of glucose into 50 milliliters of water to stir or ultrasonically dissolve to obtain a mixed solution A; (2 ) Weigh 1 gram of gelatin and add it into 25 milliliters of water for ultrasonic vibration until it is completely dissolved; then take 0.75 grams of silver nitrate and add it to the above solution and fully stir and dissolve to obtain a mixed solution B; (3) mix the mixed solution A with the mixed solution B and stir evenly, then transfer to the reaction kettle, heat up to 140°C and keep it for 150 minutes, then stop heating to obtain the silver nanowire stock solution; (4) take water and ethanol in any ratio mixed solvent to dilute the silver nanowire stock solution by 5 times, and then use Centrifuge at 8000 rpm for 5 minutes and concentrate to obtain a silver nanowire concentrate; (5) place the silver nano...

Embodiment 2

[0053] On the basis of Example 1, only the consumption of silver nitrate in the step (2) is reduced to 0.5 gram in the preparation process, and other technological parameters remain unchanged, and the silver nitrate that the diameter is 40 nanometers, length is 30~40 microns is prepared. Nanowires.

[0054] Figure 4 For the scanning electron micrograph of the silver nanowire powder product that this embodiment makes, by Figure 4 It can be seen that the silver nanowires are uniformly distributed. Figure 5 It is an optical microscope photo of the product. It can be seen from the figure that the obtained silver nanowires are evenly distributed, and the length is about 30-40 microns.

Embodiment 3

[0056] On the basis of Example 1, in the preparation process, the consumption of polyvinylpyrrolidone in step (1) is reduced to 0.75 grams, the consumption of silver nitrate in step (2) is reduced to 0.5 grams, and other process parameters remain unchanged. Silver nanowires with a diameter of 40 nanometers and a length of 1-5 micrometers are obtained.

[0057] Image 6 The scanning electron microscope picture of the silver nanowire powder product that is made in this embodiment, Figure 7 An optical microscope photograph of the product.

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Abstract

The invention discloses a method for manufacturing silver nanowires. The method includes steps of (1), manufacturing mixed solution A from surfactants, halogen-containing inorganic salt, reducing sugar and water; (2), manufacturing mixed solution B from gelatin, water and silver salt precursors; (3), mixing the mixed solution A with the mixed solution B, uniformly stirring the mixed solution A and the mixed solution B, transferring the mixed solution A and the mixed solution B into a reaction kettle, sealing the reaction kettle, heating the reaction kettle, keeping the temperature of the reaction kettle unchanged and obtaining stock solution of the silver nanowires; (4), diluting the stock solution of the silver nanowires by mixed solvents comprising water and ethanol, and removing the surfactants and the salt of the diluted stock solution of the silver nanowires to obtain concentrated solution of the silver nanowires; and (5), drying the concentrated solution of the silver nanowires to obtain powdery products of the silver nanowires. The method has the advantages that organic solvents are omitted, and the method is environment-friendly; lengths and diameters of the silver nanowires manufactured by the method can be adjusted within large ranges; and a process is simple, operation is convenient, the repeatability is good, and large-scale production can be effectively implemented.

Description

technical field [0001] The invention relates to a method for preparing silver nanowires, in particular to a silver nanowire that can be used in chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, optical information storage, solar cells, printed electronics, electromagnetic shielding, touch screens, etc. A series of preparation methods of silver nanowire materials. Background technique [0002] Transparent conductive films based on indium tin oxide (ITO) are widely used in touch products that have emerged in recent years, and are also widely used in liquid crystal displays, electromagnetic shielding layers, thin-film solar cells and other products. However, several inherent problems of ITO cannot be overcome, such as: the processing process of ITO is complex and consumes a lot of energy; indium in ITO is a scarce resource, which is over-developed and unevenly distributed around the world, which cannot meet the greater demand ; ITO is an oxide, it...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 丁轶谷小虎王正元
Owner 苏州冷石纳米材料科技有限公司
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