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Silver nanowire-based transparent conductive thin film and preparation method thereof

A technology of transparent conductive film and silver nanowire, which is applied in the direction of nanostructure manufacturing, conductive layer on insulating carrier, nanotechnology, etc., can solve the limited range of substrate selection, poor adhesion, and conductive layer is easily damaged by sticking And other issues

Inactive Publication Date: 2011-06-08
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature (S.De et al., Silver nanowire networks as flexible, transparent, conducting films: extremely high DC to optical conductivity ratios, Acs Nano 3 (2009) 1767-1774) reported a method in polyethylene terephthalate ( The method of preparing silver nanowire conductive layer on PET) film, but the adhesion between silver nanowire and PET is poor, the conductive layer is easily damaged by sticking, and the surface is not flat enough, and the surface fluctuation may be as high as 100 nanometers to 300 nanometers. There is still a considerable gap in practical application
In addition, the substrates that can form a relatively uniform conductive network with silver nanowires are concentrated in substrates with high surface energy, while the binding ability of silver nanowires to organic polymer substrates with low surface energy is not good, and it is difficult to form a uniform and firm conductive network. conductive layer of silver nanowires, so the range of substrate selection is limited to a certain extent

Method used

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  • Silver nanowire-based transparent conductive thin film and preparation method thereof
  • Silver nanowire-based transparent conductive thin film and preparation method thereof
  • Silver nanowire-based transparent conductive thin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]Use PMMA as a transparent substrate (visible light transmittance 92%), spin-coat a 10% (weight) concentration of polyvinyl alcohol (PVA) aqueous solution on it, and dry it at 70° C. for 2 hours before use. A specific volume of silver nanowire suspension in water is taken and filtered to form a uniform conductive network on the filter membrane. The filter membrane covered with the silver nanowire layer is used as a transfer membrane, which is pressed tightly on the dry PVA film, and the silver nanowire and PVA form a firm bond. The filter membrane is peeled off to obtain a uniform and firm silver nanowire transparent conductive film. Its optical microscope such as image 3 As shown, it can be seen that the silver nanowires formed a uniform conductive network on the PVA adhesion layer.

[0023] The transmittance curve is as Figure 4 As shown, the thickness and square resistance of the conductive layer of silver nanowires are as Figure 5 shown. It can be seen that th...

Embodiment 2

[0026] Use PET as a transparent substrate (visible light transmittance 91.3%), spin-coat 10% (weight) concentration of polyvinyl alcohol (PVA) aqueous solution on it, and dry it at 120° C. for 2 hours before use. A specific volume of silver nanowire suspension in water is taken and filtered to form a uniform conductive network on the filter membrane. The filter membrane covered with the silver nanowire layer is used as a transfer membrane, which is pressed tightly on the dry PVA film, and the silver nanowire and PVA form a firm bond. After the filter membrane is peeled off, a uniform and firm silver nanowire transparent conductive film is obtained.

[0027] The transmittance curve is as Figure 8 shown. When the silver nanowire distribution density is 39.8mg / m 2 When the visible light transmittance (525nm) of the PET-PVA-Ag transparent conductive film is 84.6%, the sheet resistance is 137Ω; when the visible light transmittance (525nm) is 77.2%, the sheet resistance is 18.5Ω...

Embodiment 3

[0030] Take float glass (2mm thick) as a transparent substrate, spin-coat a 10% (weight) concentration of polyvinyl alcohol (PVA) aqueous solution on it, rotate at a speed of 1500 rpm, for 15 seconds, and dry it at 120°C for 2 hours. use. Take a specific volume of ethanol suspension solution of silver nanowires, spin-coat at a speed of 1500 rpm for 15 seconds, spin-coat three times, and dry at 120°C for 30 minutes to form a transparent conductive film of silver nanowires. Compared with Example 1 and Example 2, under the same distribution density of silver nanowires, the visible transmittance is similar, but the square resistance value is significantly larger. For example, the distribution density of silver nanowires is 79mg / m 2 , the square resistance is 65Ω. If there is no PVA adhesive layer, after sticking with 3M tape once, the silver nanowires are completely stuck up, and the square resistance becomes infinite; the conductive layer of silver nanowires coated with PVA adh...

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Abstract

The invention provides a silver nanowire-based transparent conductive thin film and a preparation method thereof. The preparation method is characterized by comprising the following steps of: forming a uniform adhesive layer on a substrate by organic polymer fluid; and forming a silver nanowire conductive layer on the adhesive layer, wherein silver nanowires can be firmly adhered to the adhesive layer. Through the adhesive layer, the firmness and the reliability of the silver nanowire transparent conductive thin film are greatly improved, the problem of easiness of falling of the silver nanowires is solved, and the selection range of the substrate is expanded. If the adhesive layer is formed by polyvinyl alcohol on a polymethyl methacrylate (PMMA) substrate, the visible light transmittance reaches 84 percent when square resistance is 130.

Description

technical field [0001] The invention provides a structure of a silver nanowire-based transparent conductive film and a preparation method thereof. Background technique [0002] Transparent conductive film is a functional film with high visible light transmittance and certain conductivity. It is widely used as transparent electrodes in liquid crystal displays, touch screens, electroluminescent devices and thin film solar cells, as well as antistatic coatings and electromagnetic shielding layer. The transparent conductive film can achieve high visible light transmittance and high electrical conductivity at the same time, so it can ensure the simultaneous transmission of visible photons and carriers. So far, the transparent conductive material with the longest history and the best overall performance is tin-doped indium oxide (ITO), which can achieve a square resistance value of less than 10Ω and a resistivity lower than 1.5×10 -4 Ωcm -1 . But ITO is facing the following s...

Claims

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Application Information

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IPC IPC(8): H01B5/14H01B13/00B82B1/00B82B3/00
Inventor 曾小燕卢灿忠
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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