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Nanometer silver conductive ink and preparation method thereof

A technology of conductive ink and nano-silver, which is applied in the direction of ink, household utensils, applications, etc., can solve the problems of limiting silver conductive circuits, restrictions, and non-compliance with green inks, and achieves expanded selection range, good stability, and overcomes relative sintering temperature higher effect

Active Publication Date: 2014-06-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, increasing the sintering temperature can obtain better conductivity, but most flexible substrates cannot withstand temperatures above 200°C. Therefore, the selection of flexible substrates for existing flexible electronics is limited.
For example, CN102391716A, published on March 28, 2012, discloses a flexographic nano-silver conductive ink and its preparation method. When its sintering temperature is lower than 200°C, it has extremely high sheet resistance ( > 1000 kΩ / □), which limits the application of this ink on flexible substrates that require lower temperature sintering. At the same time, the preparation of this ink uses toluene as a solvent, which has toxicity and strange smell in actual production, and does not meet the requirements of green inks. requirements; the publication specification CN101805538A of Chinese Invention Patent Application published on August 18, 2010 discloses a conductive ink that can be sintered at a low temperature. The resistivity of bulk silver is more than 60 times, and the higher resistivity also limits its application in the preparation of silver conductive circuits on flexible substrates

Method used

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  • Nanometer silver conductive ink and preparation method thereof
  • Nanometer silver conductive ink and preparation method thereof
  • Nanometer silver conductive ink and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the ink solvent that is made up of 40 g deionized water and 5 g ethanol, add successively the nano-silver particle 9g that the surface is coated with polyglutamic acid, polyvinylpyrrolidone 0.04g, terpineol 0.5g, obtain mixed solution; Then The obtained solution was stirred for 1 hour, and 10 g of polyethylene glycol was added while stirring; ultrasonic oscillation was carried out for 25 minutes; and then filtered with a 460 nm organic filter membrane, and the finally obtained solution was nano-silver conductive ink.

[0031] Apply the nano-silver conductive ink prepared above to an ordinary piezoelectric printer, ink-jet print the silver conductive film layer on photo paper according to the circuit pattern prefabricated on the computer, and dry it at 100°C for 1 h, and use four probes The test method combined with the scanning electron microscope to measure the thickness of the cross-section of the film layer, and the calculated resistivity of the silver conduc...

Embodiment 2

[0033] In the ink solvent composed of 80g deionized water and 15g ethylene glycol, add 18g of nano-silver particles coated with polyacrylic acid, 0.09g of sodium dodecylsulfonate, and 0.5g of terpineol in sequence to obtain a mixed solution Then the obtained solution was stirred for 2 hours, and 5g of polyurethane was added while stirring; then ultrasonic oscillation was carried out for 30 minutes; and then filtered with a 360nm organic filter membrane, the finally obtained solution was nano-silver conductive ink. The particle size analysis diagram of the nano-silver particles coated with organic protective agent in the present embodiment Figure 4 shown.

[0034] Apply the nano-silver conductive ink prepared above to an ordinary piezoelectric printer, ink-jet print the silver conductive film layer on photo paper according to the prefabricated circuit pattern on the computer, and dry it at 125°C for 1 hour, and test it with four probes The method combined with the scann...

Embodiment 3

[0036] In the ink solvent composed of 30g deionized water and 5g absolute ethanol, add 6g of nano-silver particles coated with fatty alcohol polyoxyethylene ether, 0.02g of polyvinylpyrrolidone, and 0.5g of terpineol in sequence to obtain a mixed solution Then the obtained solution was stirred for 3 hours, and 7g of polyvinyl alcohol was added while stirring; then ultrasonic oscillation was carried out for 20 minutes; and then filtered with a 250nm organic filter membrane, and the finally obtained solution was nano-silver conductive ink.

[0037] Apply the nano-silver conductive ink prepared above to an ordinary piezoelectric printer, ink-jet print the silver conductive film layer on photo paper according to the prefabricated circuit pattern on the computer, and dry it at 80°C for 1 hour, and test it with four probes The thickness of the cross-section of the film layer was measured by the method combined with the scanning electron microscope, and the resistivity of the silv...

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Abstract

The invention discloses a nanometer silver conductive ink. The nanometer silver conductive ink comprises the following components expressed in weight percentage: 5 to 50% of silver particles cladded by an organic protective agent, 40 to 85% of an ink solvent, 0.03 to 1% of a surface tension conditioning agent, 0.3 to 5% of a tackifier and 1 to 18% of a dispersant. A preparation method for the nanometer silver conductive ink comprises the following steps: successively adding the silver particles cladded by an organic protective agent, the surface tension conditioning agent and the tackifier into the ink solvent so as to obtain a mixed solution; stirring the mixed solution for 1 to 4 h and adding the dispersant in the process of stirring; subjecting the mixed solution to ultrasonic vibration for 20 to 60 min; and carry outing filtering with an organic filter membrane having an aperture of 200 to 500 nm so as to obtain the nanometer silver conductive ink. The nanometer silver conductive ink provided by the invention does not contain any toxic solvent; the preparation process of the ink is green and environment friendly; a conductive circuit with good conductivity can be obtained at a low sintering temperature; during application of the ink, the range of selection of a flexible substrate is great.

Description

technical field [0001] The invention relates to a conductive ink, in particular to a nano-silver conductive ink which can be used for inkjet printing flexible electronic circuits and a preparation method thereof. Background technique [0002] Flexible electronics, also known as printed electronics or organic electronics, is a technology that deposits organic / inorganic electronic devices on flexible substrates such as paper, plastic or fabric to form circuits. Since the performance of flexible electronics is equivalent to that of traditional microelectronics, and has the characteristics of portability, transparency, light weight, stretch / bend, and easy rapid and large-area printing, some special applications that cannot be realized with traditional electronic circuits are possible, such as bendable Flexible displays, electronic paper, large-area sensor arrays, smart labels, thin-film solar cells, etc. The key to flexible electronics manufacturing is the manufacture of patter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/52C09D11/30
Inventor 沈文锋黄琦金宋伟杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI