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Method for preparing nano silver conductive ink

A conductive ink and nano-silver technology, which is used in inks, printed circuit parts, metal pattern materials, etc., can solve the problems of hindering the development of printed electronics technology, excessively large silver nanoparticles in ink, and limited selection of substrates. The effect of good conductivity, short reaction time and mild reaction conditions

Inactive Publication Date: 2010-10-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, although there are commercial products, these inks have too large silver nanoparticles, high sintering temperature, and limited range of substrate choices, which seriously hinder the development of printed electronics technology.

Method used

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  • Method for preparing nano silver conductive ink
  • Method for preparing nano silver conductive ink
  • Method for preparing nano silver conductive ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 2.01g silver laurate, 0.5g 2-nonenylsuccinic anhydride, 10ml deionized water, adjust the pH of the solution to 9-10 with ammonia water, and gradually raise the temperature to 30-100°C until the solution is clear and transparent. Then, the temperature was lowered to room temperature, 0.346g of vitamin C was added, and after 20-30 minutes of continuous stirring reaction, the solution turned brownish black, and stable nano-silver conductive ink (7wt%) could be obtained. The conductive ink was spin-coated on the polyimide film and sintered at 150° C. for 30 minutes to obtain a conductivity of 20.3 μΩ·cm.

Embodiment 2

[0029] 15.7g of silver acetate, 9.3g of octadecanoic acid, 100ml of deionized water, adjust the pH of the solution to 9-10 with ammonia water and sodium hydroxide, and gradually raise the temperature to 30-100°C until the solution is clear and transparent. Then, it was cooled down to room temperature, 1.13 g of sodium borohydride was added, and after 20 to 30 minutes of continuous stirring reaction, the solution turned brownish black, and stable nano-silver conductive ink (10 wt %) could be obtained. The conductive ink was spin-coated on the polyimide film and sintered at 200° C. for 30 minutes to obtain a conductivity of 8.1 μΩ·cm.

Embodiment 3

[0031] 5.76g of silver nitrate, 2.4g of decanoic acid, 20ml of deionized water, adjust the pH of the solution to 9-10 with ammonia water and potassium hydroxide, and gradually raise the temperature to 30-100°C until the solution is clear and transparent. Then, cool down to room temperature, add 0.42 g of hydrazine hydrate, and continue stirring for 20 to 30 minutes, the solution turns brownish black, and stable nano silver conductive ink (15 wt %) can be obtained. The conductive ink was spin-coated on the polyimide film and sintered at 100° C. for 30 minutes to obtain a conductivity of 169.2 μΩ·cm.

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Abstract

The invention belongs to the field of nano technology and particularly relates to a method for preparing nano silver conductive ink. The method comprises the following steps: dissolving a silver salt and an organic protective agent in a solvent, adjusting the pH value of the solution to 9 to 10 with an alkaline complexing agent, and raising the temperature gradually to 30 to 100 DEG C till the reaction system is a transparent solution; and cooling the reaction system obtained by the previous step to room temperature, adding a reducer into the reaction system, and continuously stirring the reaction system for 20 to 30 minutes to obtain the nano silver conductive ink. The molar ratio of the organic protective agent to the silver salt is 0.01-3:1; each 0.01 mol of silver salt is dissolved in 5 to 50 milliliters of solvent; and the molar ratio of the reducer to the silver salt is 1-3:1. The nano silver prepared by the method has the advantages that: the particle size is less than 10 nanometers; the process is simple, the reaction conditions are mild and the reaction time is short; the raw materials are simple and the dose of the dispersant is small; the purity and concentration are high; and the conductive property is good. In addition, the preparation cost of the nano silver ink is low; no harmful waste is produced, so the requirements for 'green production' are met; and the nano silver ink can be widely used in fields of touch screens, electronic tags, thin film switches, flexible circuit boards, medical products, sensors, printing contact, radio frequency interference screening, electrolysis, multilayer circuit board hole filling and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a preparation method of conductive ink, in particular to a preparation method of nano silver conductive ink. Background technique [0002] As printing technology cross-penetrates more and more with other industry technologies, a series of new cross-techniques have emerged. "Printable Electronics Technology" is the organic integration of printing technology and electronic technology, which is another major breakthrough in the current technological development. It is a new technology that makes various electronic circuits or devices on various substrates, especially flexible substrates, by printing technology, so that it has functions such as electronic transmission, signal emission, electromagnetic shielding, photoelectric conversion, etc., and adopts the additive method , high-speed printing technology to produce various electronic devices and circuits, such as radio f...

Claims

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Application Information

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IPC IPC(8): C09D11/02H05K1/09C09D11/52
Inventor 杨振国邰艳龙
Owner FUDAN UNIV
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