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Cross ordered silver nanowire film and patterning method thereof

A silver nanowire and patterning technology, which is applied in the manufacture of conductive/semiconductive layer equipment, electrical components, circuits, etc., can solve the problems of large differences in optical properties and low resolution

Active Publication Date: 2020-08-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have disadvantages such as low resolution and large difference in optical properties between etched and non-etched areas, which are visible to the naked eye.

Method used

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  • Cross ordered silver nanowire film and patterning method thereof
  • Cross ordered silver nanowire film and patterning method thereof
  • Cross ordered silver nanowire film and patterning method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The AgNW stock solution was prepared according to the literature [Chen G, Bi L, Yang Z, et al. Water-based purification of ultrathin silver nanowires toward transparent conductive films with atransmittance higher than 99%. ACS Applied Materials & Interfaces, 2019, 11: 22648-22654.], The silver nanowires have a diameter of 15-30nm and a length of 20-40μm.

[0046] (1) Use ethanol solvent to dynamically stir and clean the AgNWs stock solution. The specific operation is as follows:

[0047] Pour 60 mL of the AgNW stock solution into a purification device with a filter membrane (8 μm in pore size) and a six-hole stirring paddle, and dilute to 300 mL with absolute ethanol. The stirring speed of the six-hole stirring paddle was set at 900 rpm. During the cleaning process, slowly drop anhydrous ethanol into the purification device to maintain a constant volume of the solution for a total of 40 minutes of cleaning. After cleaning, perform a positive pressure filtration first...

Embodiment 2-6

[0082] Change the coating film speed, see Table 2 for details, and the others are the same as in Example 1 to obtain the unidirectional ordered AgNWTCF, the OM photos of the obtained TCFs and the changes in the ordering degree are as follows Figure 5 shown.

[0083] Table 2

[0084] Example Coating speed Example 2 50mm·s -1

[0085] Depend on Figure 5 (a)-(h) It can be seen that as the coating speed decreases, the degree of ordering of AgNWs on TCF increases sharply at first, and then at 60mm s -1 , decreased slightly.

Embodiment 7-11

[0087] Change the concentration of the dispersion liquid in step (2), as shown in Table 3. Others are the same as in Example 1 to obtain a unidirectional ordered AgNW TCF. The OM photos of the obtained TCFs and the changes in the ordering program are as follows Image 6 shown.

[0088] table 3

[0089]

[0090]

[0091] like Image 6 As shown in (a)–(f), as the concentration of AgNWs in the dispersion increases, the density of AgNWs on the coated TCF also increases. The ordering degree of the AgNWs network first increases with the increase of the AgNWs concentration, and when the AgNWs concentration is greater than 0.4wt%, the ordering degree of the AgNWs network tends to be stable ( Image 6 (g) and (h)).

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Abstract

The invention provides a cross ordered silver nanowire film and a patterning method thereof. The patterning method comprises the following steps: (1) purifying an AgNWs stock solution prepared by a polyol reduction method by adopting a dynamic stirring and cleaning method; (2) dispersing the purified AgNWs in absolute ethyl alcohol to prepare AgNW dispersion liquid with the concentration of 0.4 wt% or above; (3) carrying out ultrasonic cleaning, surface hydrophilization treatment and PLL aqueous solution spin-coating modification on the PET base material; (4) obtaining a cross ordered silver nanowire transparent conductive film by adopting a Meyer rod coating method; and (5) spin-coating a positive photoresist on the crossed ordered silver nanowire transparent conductive film, and then carrying out pre-curing, ultraviolet exposure, development, etching, washing and drying to obtain a conductive channel with a certain shape. According to the invention, the ordering degree of the AgNW TCF prepared by the rod coating method can be greatly improved, and the patterning method provided by the invention can improve the precision of the pattern without influencing the optical performance of the conductive film.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of nanometer materials, and in particular relates to a method for ordering silver nanowires and patterning them. Background technique [0002] Transparent conductive electrodes are widely used in optoelectronic devices, such as flexible solar cells, flexible touch screens and displays, etc. Currently, the most common material used to prepare transparent conductive electrodes is indium tin oxide (ITO), but due to the high cost of ITO materials, and the fact that they are hard and brittle, their applications are very limited. As a new type of material that is most promising to replace ITO, silver nanowires (AgNW) have better light transmission and conductivity than graphene, carbon nanotubes, conductive polymers, etc. Moreover, the AgNW network can be directly prepared by methods such as bar coating, spin coating or spray coating, with low cost and simple method. However, the g...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B13/30
CPCH01B13/00H01B13/0026H01B13/30
Inventor 潘军吴泽磊叶萃
Owner ZHEJIANG UNIV OF TECH