Preparation method for conductive ink with low percolation threshold

A conductive ink and percolation threshold technology, applied in inks, household appliances, applications, etc., can solve the problem of easy agglomeration of silver nanowires, and achieve the effect of reducing the amount of use, lowering the percolation threshold and improving the use efficiency.

Active Publication Date: 2015-12-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to develop a simple and effective method to promote the dispersion of silver nanowires in the resin matrix for the problem that silver nanowires are easy to agglomerate in the resin matrix after the current conductive ink is cured and dried, and to prepare a kind of silver nanowires with low Percolation Threshold Conductive Inks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1mg·mL at room temperature -1 Graphene oxide / deionized water dispersion was slowly added dropwise to 5mg·mL -1 In the silver nanowire / ethanol dispersion liquid, stir and vibrate while adding dropwise, the mass ratio of silver nanowire and graphene oxide is controlled at 3:1; After centrifuging at 2000rpm for 40min, the supernatant was discarded to obtain a gelatinous silver nanowire / graphene oxide hybrid; the obtained hybrid was mixed with the epoxy resin prepolymer (the hybrid accounted for 1% of the epoxy resin prepolymer). 8vol%), and then drop ethyl acetate to adjust the viscosity to 5.0Pa·s to obtain a low percolation threshold conductive ink. At this time, the volume resistivity of the conductive ink is about 1.2×10 -4 Ω·cm.

Embodiment 2

[0029] 0.5mg·mL at 50oC -1 Nanocrystalline cellulose / deionized water dispersion was slowly added dropwise to 2mg·mL -1 In the silver nanowire / acetone dispersion liquid, stir and vibrate while adding dropwise, the mass ratio of silver nanowire and nano-microcrystalline cellulose is controlled at 2:1; after silver nanowire and nano-microcrystalline cellulose are hybridized and coprecipitated, It was centrifuged at 6000rpm for 5min, and the supernatant was discarded to obtain a gelatinous silver nanowire / nanocrystalline cellulose hybrid; the obtained hybrid was mixed with aqueous acrylate (solid content 15wt%) (hybrid) Accounting for 5vol% of the water-based acrylate), drop in deionized water to adjust the viscosity of the conductive ink to 2.0Pa s to obtain a low percolation threshold conductive ink. At this time, the volume resistivity of the conductive ink is about 3.2×10 -4 Ω·cm.

Embodiment 3

[0031] 0.1mg·mL at 80oC -1 Slowly add the montmorillonite nanosheet / deionized water dispersion to 10mg·mL -1 In the silver nanowire / ethanol dispersion, stir and oscillate while adding dropwise, the mass ratio of silver nanowires and montmorillonite nanosheets is controlled at 6:1; when the silver nanowires and nano-montmorillonite nanosheets are hybridized and co-precipitated Finally, it was centrifuged at 4000rpm for 20min, and the supernatant was discarded to obtain a gel-like silver nanowire / montmorillonite nanosheet hybrid; the obtained hybrid was mixed with the phenolic resin prepolymer (the hybrid accounted for phenolic resin 3vol% of the resin prepolymer), drop tetrahydrofuran to adjust the viscosity of the conductive ink to 4.0Pa·s, and obtain a conductive ink with a low percolation threshold. At this time, the volume resistivity of the conductive ink is about 9.2×10 -4 Ω·cm.

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Abstract

The invention discloses a preparation method for conductive ink with a low percolation threshold. The preparation method particularly comprises the following steps that silver nanowire dispersion liquid is mixed with non-conductive nano particle dispersion liquid, and silver nanowires and non-conductive nano particles are hybridized and assembled to form hybrids of the silver nanowires and the non-conductive nano particles; the hybrids are centrifuged, and supernatant liquid is discarded to obtain gelatinous hybrids of the silver nanowires and the non-conductive nano particles; the obtained hybrids are evenly mixed with macromolecular matrixes, and after the viscosity is regulated with solvent, the conductive ink with the low percolation threshold is obtained. The preparation method is simple and effective, solves the problem that at present, the silver nanowires are prone to agglomeration in the resin matrixes after the conductive ink is solidified and dried, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of advanced functional materials, in particular to a preparation method of conductive ink with low percolation threshold. Background technique [0002] Conductive ink is a kind of conductive composite material with a certain viscosity and certain conductive properties made by dispersing conductive fillers in a polymer matrix. Since conductive ink has similar characteristics to ink, conductive ink can be printed, printed or directly with a pen. Write down the corresponding electronic devices. There are many types of conductive inks, mainly including gold, silver, copper and carbon-based conductive inks. Carbon-based conductive inks have reached the level of practical use, but the conductivity of carbon-based conductive inks is often low and cannot be used in high-end electronics. Products; the cost of gold-based conductive inks is too high to achieve large-area applications; while copper-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/52
Inventor 刘岚魏勇陈世龙李富城林勇张颖陈松袁雪
Owner SOUTH CHINA UNIV OF TECH
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