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CN-122000132-A - Nanometer metal conductive network/polymer substrate flexible transparent electrode based on coordination bonding and preparation method thereof

CN122000132ACN 122000132 ACN122000132 ACN 122000132ACN-122000132-A

Abstract

The invention provides a nanometer metal conductive network/polymer substrate flexible transparent electrode based on coordination bonding and a preparation method thereof, relating to the field of flexible electronic materials, the method comprises the following steps of S1, coating metal nanowire dispersion liquid on the surface of a hydrophobic substrate, and forming a micron-sized conductive network by self-assembly of coffee ring effect; S2, preparing a substrate solution for forming coordination bonding with the metal material, S3, embedding the micron-sized conductive network obtained in the step S1 into the substrate solution obtained in the step S2, and forming the embedded electrode through drying and stripping. The method disclosed by the invention is simple in process and suitable for large-area preparation, and the obtained electrode has the advantages of high visible light transmittance, low sheet resistance, excellent mechanical stability, quick thermal response and the like. The flexible transparent electrode can replace the traditional brittle conductive substrates such as FTO, ITO and the like, and has wide application prospects in the fields of flexible solar cells, luminous displays, wearable optoelectronic devices and the like.

Inventors

  • CAI GUOFA
  • SUI QING

Assignees

  • 河南大学

Dates

Publication Date
20260508
Application Date
20260306

Claims (7)

  1. 1. The preparation method of the nano metal conductive network/polymer substrate flexible transparent electrode based on coordination bonding is characterized by comprising the following steps: S1, coating a metal nanowire dispersion liquid on the surface of a hydrophobic substrate, and forming a micron-sized conductive network by self-assembly through a coffee ring effect; s2, preparing a substrate solution for forming coordination bonding with a metal material; s3, embedding the micron-sized conductive network formed in the step S1 into the substrate solution prepared in the step S2, and forming an embedded electrode through drying and stripping, wherein the metal nanowire and a polymer group of the substrate solution strengthen interface binding force through coordination bonding.
  2. 2. The method according to claim 1, wherein in the step S1, any one of silver nanowires, copper nanowires and nickel nanowires is used as the metal nanowires, the aspect ratio of the metal nanowires is greater than 100, and the concentration of the metal nanowire dispersion liquid is 0.05-10 mg/mL.
  3. 3. The method of claim 1, wherein in step S1, the hydrophobic substrate is a fluoropolymer material or a hydrophobically treated glass having a contact angle with deionized water of greater than 70 °.
  4. 4. The method according to claim 1, wherein in step S2, the base solution is any one selected from the group consisting of polyvinyl alcohol, polyethylene glycol, hydroxyethyl cellulose, polyacrylic acid, and polyethyleneimine.
  5. 5. The method according to claim 1, wherein in the step S2, the mass fraction of the base solution is 0.1-10 wt%, and a plasticizer is added to the base solution to adjust flexibility, and the plasticizer is added at a concentration of 0.01-2 wt%.
  6. 6. The method according to claim 1, wherein the drying condition of the solvent in the base solution in step S3 is 30 to 120 ℃.
  7. 7. The flexible transparent electrode based on coordination bonding and provided with a nano metal conductive network/polymer substrate is characterized in that the electrode is prepared by the method of any one of claims 1-6, has an embedded structure, has visible light transmittance of more than 85%, sheet resistance of less than 50 ohm/sq, has a resistance change rate of less than 10% after bending cycle for at least 1000 times, and is suitable for an electrothermal color-changing device.

Description

Nanometer metal conductive network/polymer substrate flexible transparent electrode based on coordination bonding and preparation method thereof Technical Field The invention relates to the technical field of flexible electronic materials, in particular to a nano metal conductive network/polymer substrate flexible transparent electrode based on coordination bonding and a preparation method thereof, which are suitable for the fields of flexible display, wearable electronic devices, electrothermal color-changing devices, flexible energy equipment and the like. Background With the vigorous development of flexible electronic technology, the transparent conductive electrode is taken as a key component of a flexible optoelectronic system, and the performance quality of the transparent conductive electrode has a decisive influence on the whole surface of the device. Conventional transparent conductive electrode materials such as Indium Tin Oxide (ITO) have good optical transparency and electrical properties, but are difficult to meet the wide demands in the flexible electronics field due to their inherent brittleness and scarcity. Therefore, development of a novel transparent conductive electrode material with high conductivity, high transparency, good environmental stability and high mechanical stability has important practical significance. Metal nanowires are regarded as very potential ITO replacement materials by virtue of their adjustable aspect ratio, excellent mechanical flexibility, and ease of wet film formation. However, the existing flexible transparent electrode based on the metal nanowire has the defects that the adhesion force between the metal nanowire and a common substrate (such as polyethylene terephthalate (PET) and Polydimethylsiloxane (PDMS)) is weak, the mechanical stability is poor, the performance is easy to be reduced under the mechanical deformation of bending, twisting, folding, stripping and the like, and the conductivity and the long-term reliability of the electrode are affected. Disclosure of Invention In view of the above, the present invention aims to provide a nano metal conductive network/polymer substrate flexible transparent electrode based on coordination bonding and a preparation method thereof, aiming at the technical problems of poor environmental stability and insufficient mechanical stability in the existing metal substrate flexible transparent conductive electrode application, which are caused by the fact that the metal nanowire mesh is embedded in a substrate capable of interacting with the metal, and the metal nanowire forms coordination bonds with groups in the substrate, so that the interaction force between the metal nanowire and the substrate is enhanced, the environmental stability and the mechanical stability of the electrode are improved, and the flexible transparent electrode with high transparency, high conductivity, good environmental stability, excellent mechanical stability and large-scale preparation is realized. The embodiment of the invention provides a preparation method of a nano metal conductive network/polymer substrate flexible transparent electrode based on coordination bonding, which comprises the following steps: S1, coating a metal nanowire dispersion liquid on the surface of a hydrophobic substrate, and forming a micron-sized conductive network by self-assembly through a coffee ring effect; s2, preparing a substrate solution for forming coordination bonding with a metal material; s3, embedding the micron-sized conductive network formed in the step S1 into the substrate solution prepared in the step S2, and forming an embedded electrode through drying and stripping, wherein the metal nanowire and a polymer group of the substrate solution strengthen interface binding force through coordination bonding. According to an embodiment of the present application, in step S1, the metal nanowire includes silver nanowires, copper nanowires, nickel nanowires or alloy nanowires thereof, and the aspect ratio of the metal nanowire is greater than 100, the concentration of the metal nanowire dispersion solution is 0.05-10 mg/mL, and the dispersion solvent may be a low boiling point solvent such as water, ethanol, isopropanol, and the like. According to one embodiment of the present application, in step S1, the hydrophobic substrate is a polyfluoroalkoxy group, a fluorine-containing polymer material or a hydrophobic treated glass, the contact angle between the glass and deionized water is greater than 70 °, and the film is formed by using the coffee ring effect under the condition of controlling the ambient temperature (e.g. 20-35 ℃) and the relative humidity (e.g. 30% -70%). Further, the fluoropolymer material can be selected from Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), ethylene-tetrafluoroethylene copolymer (ETFE), ethylene-chlorotrifluoroethylene copolymer (ECTFE), polyvinyl fluoride (PVF), tetrafluoroethylene-perfluoroalkyl vinyl ethe