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Method for preparing flexible conductive film by coating copper nanoparticles with citrate

A technology of copper nanoparticles and citrate, applied in the field of microelectronics, can solve problems such as poor bending stability, achieve enhanced conductivity, simple and easy preparation method, and improve corrosion resistance

Pending Publication Date: 2022-04-12
广东中实金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the copper film in the prior art usually requires high-temperature sintering in a reducing environment and thermal sintering in a vacuum for a sufficient time to make it conductive.
However, flexible substrates cannot tolerate these conditions
Rapid oxidation in air and poor bending stability are major constraints for the widespread use of copper inks

Method used

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  • Method for preparing flexible conductive film by coating copper nanoparticles with citrate
  • Method for preparing flexible conductive film by coating copper nanoparticles with citrate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The method provided by the invention adopts citrate-coated copper nanoparticles to prepare a flexible conductive film, comprising the following steps:

[0036] 1) Synthesis of citrate-coated copper nanoparticles—copper nanoparticles (CuNPs) were synthesized by a wet chemical reduction method, and the specific steps are as follows:

[0037] 1.1) Dissolving 50 mmol of copper chloride in 20 ml of water, raising the temperature of the reaction mixture to 90° C., stirring continuously at a speed of 1200 rpm, and keeping the temperature and speed constant throughout the synthesis reaction process;

[0038] Add 0.96 mg of citric acid (CA) to the reaction mixture solution, then add 0.76 mg of low sodium phosphate monohydrate (NaH 2 PO 2 .H 2 O, SHP), the reaction mixture was stirred at the same constant temperature for 15min until the reaction was complete. The complete judgment standard was: first observe that the reaction color changed from greenish blue to greenish blue in...

Embodiment 2

[0047] The method provided by the invention adopts citrate-coated copper nanoparticles to prepare a flexible conductive film, comprising the following steps:

[0048] 1) Synthesis of citrate-coated copper nanoparticles—copper nanoparticles (CuNPs) were synthesized by a wet chemical reduction method, and the specific steps are as follows:

[0049] 1.1) 50 mmol of copper chloride was dissolved in 20 ml of water, and the temperature of the reaction mixture was raised to 80° C., continuously stirred at a speed of 1000 rpm, and the temperature and speed were kept constant throughout the synthesis reaction process;

[0050] Add 0.96 mg of citric acid (CA) to the reaction mixture solution, then add 0.66 mg of low sodium phosphate monohydrate (NaH 2 PO 2 .H 2 O, SHP), the reaction mixture was stirred at the same constant temperature for 15min until the reaction was complete. The complete judgment standard was: first observe that the reaction color changed from greenish blue to green...

Embodiment 3

[0059] The method provided by the invention adopts citrate-coated copper nanoparticles to prepare a flexible conductive film, comprising the following steps:

[0060] 1) Synthesis of citrate-coated copper nanoparticles—copper nanoparticles (CuNPs) were synthesized by a wet chemical reduction method, and the specific steps are as follows:

[0061] 1.1) Dissolving 50 mmol of copper chloride in 20 ml of water, raising the temperature of the reaction mixture to 100° C., stirring continuously at a speed of 1200 rpm, and keeping the temperature and speed constant throughout the synthesis reaction process;

[0062] Add 0.96 mg of citric acid (CA) to the reaction mixture solution, then add 0.86 mg of low sodium phosphate monohydrate (NaH 2 PO 2 .H 2 O, SHP), the reaction mixture was stirred at the same constant temperature for 15min until the reaction was complete. The complete judgment standard was: first observe that the reaction color changed from greenish blue to greenish blue i...

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Abstract

The invention discloses a method for preparing a flexible conductive film by coating copper nanoparticles with citrate. The method solves the technical problems that in the prior art, copper-based conductive ink is complex in preparation process, prone to oxidation in air and poor in bending stability. The method for preparing the flexible conductive film by adopting citrate-coated copper nanoparticles comprises the following steps: 1) synthesis of citrate-coated copper nanoparticles: synthesizing the copper nanoparticles by adopting a wet chemical reduction method: dissolving copper chloride in water, heating and stirring to obtain copper nanoparticles; citric acid and sodium hypophosphate are added into the reaction mixture solution, stirring is conducted under the constant-temperature condition till the reaction is completed, and copper nanoparticles coated with citrate are prepared; and 2) preparing a flexible conductive copper film: preparing a layered structure in which the copper film is sandwiched between sintering paste rich in hydrazine, and then conducting the copper film by a low-temperature self-sintering method to prepare the conductive copper film, and the copper film is prepared from the copper nanoparticles coated with the citrate prepared in the step 1). The method can be widely applied to the microelectronic technical field.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a method for preparing a flexible conductive film by coating copper nanoparticles with citrate. Background technique [0002] Over the past few years, the increasing demand for electronic products has caused a huge revolution in the field of electronics. Due to the growing demand for wearable electronics, printable flexible electronics are gaining increasing attention. The development of printable flexible electronics is one of the revolutionary inventions of the current decade that seems set to change the world in the near future. Conductive inks have found tremendous application in the field of flexible electronics. [0003] Conductive metal nanoparticles are attracting researchers and scientists from all over the world due to their unique physical and chemical properties, small size and large surface area. The properties of these conductive nanomaterials have revol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00
Inventor 方瀚宽梁静珊
Owner 广东中实金属有限公司
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