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Flexible and transparent conductive thin film and preparation method thereof

A transparent conductive film, flexible technology, used in cable/conductor manufacturing, conductive layers on insulating carriers, circuits, etc. problems, to avoid the post-processing welding process, increase the adhesion of the substrate, and reduce the surface roughness.

Inactive Publication Date: 2018-08-31
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this hot pressing sintering condition is extremely easy to damage the flexible plastic substrate
In addition, in the above disclosed technologies, the adhesion between the transparent conductive film and the substrate is ignored. Due to the poor adhesion of conductive materials such as graphene and metal nanowires to the flexible plastic substrate, the transparent conductive film will undergo repeated stretching and bending. The film falls off from the substrate, causing damage to the conductive film, which seriously affects the operational stability and reliability of flexible optoelectronic devices.

Method used

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  • Flexible and transparent conductive thin film and preparation method thereof
  • Flexible and transparent conductive thin film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing a flexible transparent conductive film, comprising the following steps:

[0035] 1) Under stirring conditions, add 400mg graphene oxide to 400mL Tris buffer solution, adjust the pH value to 8.5, and ultrasonically disperse to obtain a graphene oxide dispersion; then add 200mg dopamine for oxidative polymerization, The reaction was carried out under the condition of stirring at 60°C for 24 hours, the color of the reaction solution gradually changed from brownish yellow to black, and a uniform reaction mixture was obtained. Oxidative polymerization occurs and the graphene oxide is reduced to graphene. At the same time, the amino group on the dopamine undergoes a covalent cross-linking reaction with the carboxyl group and epoxy group on the graphene oxide sheet, so that the reacted polydopamine is firmly adsorbed on the surface of the graphene sheet.

[0036] After the reaction was completed, the reaction mixture was filtered and washed several time...

Embodiment 2

[0065] A method for preparing a flexible transparent conductive film, comprising the following steps:

[0066] 1) Under stirring conditions, add 200mg graphene oxide to 400mL Tris buffer solution, adjust the pH value to 8.5, and ultrasonically disperse to obtain a graphene oxide dispersion; then add 400mg dopamine for oxidative polymerization, The reaction was carried out for 48 h under stirring at room temperature, the color of the reaction solution gradually changed from brownish yellow to black, and a uniform reaction mixture was obtained.

[0067] After the reaction was completed, the reaction mixture was filtered and washed several times to remove unreacted dopamine, and the filtered product was collected; the filtered product was dissolved in distilled water, centrifuged several times at 11,000 rpm until the supernatant was colorless, and the filtered product was removed. Graphene oxide that did not participate in the reaction, and the precipitate was collected, which wa...

Embodiment 3

[0082] A method for preparing a flexible transparent conductive film, comprising the following steps:

[0083]1) Under stirring conditions, add 100mg graphene oxide to 400mL Tris buffer solution, adjust the pH value to 8.5, and ultrasonically disperse to obtain a graphene oxide dispersion; then add 400mg dopamine for oxidative polymerization, The reaction was carried out under the condition of stirring at 60°C for 12 hours, the color of the reaction solution gradually changed from brownish yellow to black, and a uniform reaction mixture was obtained.

[0084] After the reaction was completed, the reaction mixture was filtered and washed several times to remove unreacted dopamine, and the filtered product was collected; the filtered product was dissolved in distilled water, centrifuged several times at 11,000 rpm until the supernatant was colorless, and the filtered product was removed. Graphene oxide that did not participate in the reaction, and the precipitate was collected, ...

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Abstract

The invention discloses a flexible and transparent conductive thin film and a preparation method thereof. The structure of the flexible and transparent conductive thin film is characterized in that transparent and flexible plastic is used as a substrate, and a surface-modified graphene layer, a metal nanowire layer and a conductive polymer layer are sequentially arranged from bottom top. The preparation method comprises the following steps of 1) preparing a graphene oxide dispersing liquid, adding dopamine for oxidation polymerization reaction, and removing a product which does not react aftercompletion to obtain dopamine-grafted graphene; 2) respectively preparing a dopamine-grafted dispersing liquid and a metal nanowire dispersing liquid which are sequentially marked as a first dispersing liquid and a second dispersing liquid, and adding a conductive doping agent into a conductive polymer solution to obtain a first solution; and 3) sequentially attaching the first dispersing liquid,the second dispersing liquid and the first solution onto the substrate layer by layer, and performing drying to obtain the flexible and transparent conductive thin film. According to the method, thebonding strength between the conductive layer and the flexible plastic layer is improved by a graphene surface layer winkle structure and the adhesion of the polydopamine, meanwhile, a high-temperature condition is not needed, and the flexible plastic substrate cannot be damaged.

Description

technical field [0001] The invention relates to the field of conductive films, in particular to a flexible transparent conductive film and a preparation method thereof. Background technique [0002] Transparent conductive films are widely used in touch screens, organic light-emitting diodes, solar cells, electrochromic glass, electronic skin and other fields. At present, most of the commercial transparent conductive film materials are indium tin oxide and ITO. Due to their shortcomings such as brittleness, toxicity and high price, it is difficult to meet the needs of the development of flexible and wearable electronic devices. Metal nanowires and graphene have attracted extensive attention due to their unique optoelectronic and mechanical properties, and are expected to replace ITO and become new flexible transparent conductive thin film materials. However, metal nanowires and graphene-based transparent conductive films still have some problems that limit their large-scale ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B5/14H01B13/00
CPCH01B5/14H01B13/00
Inventor 张兴祥苗锦雷刘海辉张华王宁
Owner TIANJIN POLYTECHNIC UNIV
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