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Preparation method and application of silver nanowire with high length-width ratio

A silver nanowire, aspect ratio technology, applied to conductive layers on insulating carriers, metal/alloy conductors, etc., can solve the problems of affecting the photoelectric properties of thin films, low photoelectric properties of transparent conductive films, etc., to improve process stability, High uniformity and good dispersion effect

Active Publication Date: 2013-10-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the nanowires are loosely packed, clusters of silver nanowires may occur during the subsequent colloid deposition process, thereby affecting the photoelectric performance of the film
Therefore, the photoelectric performance of the transparent conductive film prepared by the existing silver nanowires and the existing process is low, such as the sheet resistance is 15-200Ω / □, and the light transmittance is 40-75%.

Method used

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  • Preparation method and application of silver nanowire with high length-width ratio
  • Preparation method and application of silver nanowire with high length-width ratio
  • Preparation method and application of silver nanowire with high length-width ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1. Measure 0.099L of ethylene glycol, 10g of polyvinylpyrrolidone (PVP), and 1ml of silver chloride liquid with a concentration of 0.01mol / L to prepare a mixed solution (the concentration of metal halide in the mixed solution is 0.0001mol / l), Heating to 170° C. is stable to obtain "Solution 1";

[0055] 2. Weigh 0.18g of silver nitrate, add it into "solution 1" (the concentration of silver element is 0.01mol / l), and react for 5 hours to get "solution 2";

[0056] "Solution 2" was centrifugally cleaned with a cleaning agent composed of ethanol and acetone at a volume ratio of 1:3 at a centrifugal speed of 500r / min, and stable dispersed silver nanowires could be obtained after cleaning for 3 times.

[0057] Comparison of experimental results: Figure 5 This is the optical photo of the silver nanowires synthesized in this example. It can be seen from the photo that the nanowires have good dispersion. Counting its length, the result is as follows Figure 6 shown. From ...

Embodiment 2

[0059] 1. Measure 0.090L ethylene glycol methyl ether, 0.1g polyvinylpyrrolidone (PVP), 10ml sodium chloride solution (molar concentration 0.01mol / L) to prepare a mixed solution (the concentration of metal halide in the mixed solution is 0.001mol / l), heated to 130°C and stabilized to obtain "Solution 1";

[0060] 2. Weigh 3.4g of silver acetate and dissolve it in 0.05L of ethylene glycol to prepare a solution, add it to "solution 1" (the concentration of silver element is 0.2mol / l), and react for 10 hours to obtain "solution 2";

[0061] "Solution 2" was centrifugally cleaned with a cleaning agent composed of ethanol and acetone at a volume ratio of 2:3 at a centrifugal speed of 1000r / min, and stable dispersed silver nanowires could be obtained by cleaning 4 times.

[0062] Experimental results such as Figure 7 , Figure 8 shown. Figure 7 It is an optical photo of silver nanowires. It can be seen from the picture that the nanowires have good dispersion. Counting its len...

Embodiment 3

[0064] 1. Measure 0.099L ethylene glycol, 1g polyvinylpyrrolidone (PVP), 1ml potassium bromide solution (molar concentration 0.03mol / L) to prepare a mixed solution (the concentration of metal halide in the mixed solution is 0.0003mol / l) , heated to 150°C to be stable to obtain "Solution 1";

[0065] 2. Weigh 1.8g of silver nitrate, add it into "solution 1" (the concentration of silver element is 0.1mol / l), react for 7 hours, and get "solution 2";

[0066] "Solution 2" was centrifugally cleaned with a cleaning agent composed of ethanol and acetone at a volume ratio of 1:1 at a centrifugal speed of 2500r / min, and stable dispersed silver nanowires could be obtained by cleaning 5 times.

[0067] Experimental results such as Figure 9 , Figure 10 shown. Figure 9 It is an optical photo of silver nanowires. It can be seen from the picture that the nanowires have good dispersion. Counting its length, the result is as follows Figure 9 shown. From Figure 10 It can be seen tha...

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Abstract

The invention discloses a method for compositing a silver nanowire with a high length-width ratio, that is, through a one-time addition of silver salt to carry out reduction reaction, the silver nanowire with the average length of more than 52 micrometers and the average length-width ratio of more than 400 can be acquired. The method does not need to accurately control the adding velocity of reactant, the composited silver nanowire is good in dispersity and high in uniformity, compared with the traditional polyhydric alcohol method, the average length-width ratio of the silver nanowire is improved by more than 5 times, through the preparation of a flexible transparent conductive film on a transparent flexible plastic substrate, the visible light penetration rate is more than 90 %, and the square resistance is lower than 10 Omega / square. Compared with the traditional polyhydric alcohol method, the method provided by the invention is simple in technology control and high in repeatability, and is in favor of the batch production of the silver nanowire with the high length-width ratio.

Description

technical field [0001] The invention relates to a preparation method and application of silver nanowires with high aspect ratio, belonging to the technical field of inorganic nanomaterial preparation. Background technique [0002] Silver nanowires have excellent electrical and electrochemical properties, and have broad application prospects in the fields of transparent thin film electrodes, catalysis, and biomedicine. The aspect ratio is a key factor affecting the application of silver nanowires. For example, in the preparation of transparent conductive films, the lower aspect ratio seriously affects the improvement of its light transmission performance. In the existing synthesis of silver nanowires, the "polyol method" (Advanced Materials (2002) 14,833; Nano letters (2003) 3,955) proposed by Xia Younan et al. This method requires the use of a peristaltic pump to accurately control the injection rate of the silver nitrate solution and the template solution to obtain silver...

Claims

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Application Information

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IPC IPC(8): B22F9/24H01B1/02H01B5/14
Inventor 周聪华阳军亮杨兵初高永立夏兴达陆炜俊颜庚骅
Owner CENT SOUTH UNIV
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