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Method for preparing silver nanowires

A technology of silver nanowires and silver salts, applied in the field of preparing silver nanowires, can solve the problems of long heating and cooling process, difficulty in preparing silver nanowires, high energy consumption, etc., and achieve the advantages of convenient operation, simple process and low surface resistance Effect

Active Publication Date: 2015-02-11
珠海纳金科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can effectively prepare silver nanowires, such synthesis methods often require heating, so they will face a problem of high-temperature energy consumption in large-scale preparation. There is a danger of explosion, and the heating and cooling process takes a relatively long time, making it difficult to prepare silver nanowires in large quantities, quickly, continuously and easily

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  • Method for preparing silver nanowires
  • Method for preparing silver nanowires
  • Method for preparing silver nanowires

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A method for preparing silver nanowires, comprising the steps of: (1) preparing a mixed solution of dimethylformamide, water, ascorbic acid and polyvinylpyrrolidone earlier: get 1 gram of ascorbic acid and add it to 50 milliliters of dimethylformamide and In the water mixed solvent (the volume ratio of dimethylformamide and water is 1:1), after stirring or ultrasonically dissolving, add polyvinylpyrrolidone, stir or ultrasonically dissolve to obtain mixed solution A; (2) take 1 gram of silver nitrate Add 25 ml of ethylene glycol, stir or oscillate to dissolve, then add 0.005 g of chloroauric acid, and mix thoroughly to obtain mixed solution B; (3) Mix mixed solution A and mixed solution B evenly, then place in a dark room and stir Keep it under the pressure for 4 hours, stop stirring to get the silver nanowire stock solution; (4) dilute the silver nanowire stock solution 5 times with a mixed solvent composed of water and ethanol, then centrifuge at a speed of 10000 rpm f...

Embodiment 2

[0042]On the basis of Example 1, in the preparation process, the consumption of silver nitrate in step (2) is promoted to 3 grams, and chloroauric acid is replaced with chloroplatinic acid, and the centrifugation speed in step (4) is reduced to 6000 rpm The silver nanowires with a diameter of 40 nanometers were prepared while other process parameters remained unchanged.

[0043] figure 2 The transmission electron micrograph of the silver nanowire powder product that this embodiment makes, by figure 2 It can be seen that the diameter distribution is narrow. image 3 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, and there is no agglomeration phenomenon. The transparent conductive film prepared based on this product has the characteristics of high flexibility, high light transmittance, and low sheet resistance.

Embodiment 3

[0045] On the basis of embodiment 1, in the preparation process, ethylene glycol is replaced with glycerol in step (2), the consumption of silver nitrate is promoted to 3.5 grams, and chloroauric acid is replaced with ferric chloride, and other processing parameters remain unchanged Change, and prepare silver nanowires with a diameter of 70 nm.

[0046] Figure 4 The scanning electron microscope picture of the silver nanowire powder product that is made in this embodiment, Figure 5 An optical microscope photograph of the product.

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Abstract

The invention discloses a method for preparing silver nanowires. The method includes: (1) sequentially taking organic amine solvent, water, ascorbic acid and surface active agent to prepare mixed solution A; (2) taking silver salt precursors, chlorinated inorganic salt and polyhydric alcohols solvent to prepare mixed solution B; (3) mixing the mixed solution A with the mixed solution B to obtain basic silver nanowire solution; (4) diluting the basic silver nanowire solution, washing and purifying to obtain concentrated silver nanowire solution; and (5) drying the concentrated silver nanowire solution to obtain silver nanowire powder product. The method for preparing the silver nanowires has the advantages that the method is simple, easy to operate and needless for heating, the obtained silver nanowires are adjustable in diameter in a large range, the method is simple in technology, convenient to operate and good in repeatability, and transparent conducting thin films made of the obtained product have the advantages of high transparency, low surface resistance, low haze and the like and are fully similar to ITO (indium tin oxide) transparent conducting thin films in performance.

Description

technical field [0001] The invention relates to a method for preparing silver nanowires, in particular to a series of silver nanowires that can be used in chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, optical information storage, solar cells, electromagnetic shielding, touch screens, etc. Preparation method of nanowire material. Background technique [0002] In recent years, with the widespread popularization of touch electronic products, the requirements for touch screens have become higher and higher, especially the new generation of touch products has put forward higher requirements for light transmittance, conductivity, and flexibility. Due to the shortage of resources, poor flexibility, complex manufacturing process, and high energy consumption, the traditional indium tin oxide (ITO) can no longer meet the requirements of the new generation of touch technology and thin-film solar cells. It is very necessary to develop new alternative ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 丁轶谷小虎王正元
Owner 珠海纳金科技有限公司
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