CN113764118B - Preparation method and application of stretchable high-conductivity material - Google Patents
Preparation method and application of stretchable high-conductivity material Download PDFInfo
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- CN113764118B CN113764118B CN202111055031.3A CN202111055031A CN113764118B CN 113764118 B CN113764118 B CN 113764118B CN 202111055031 A CN202111055031 A CN 202111055031A CN 113764118 B CN113764118 B CN 113764118B
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- 239000000463 material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 42
- 239000004020 conductor Substances 0.000 claims abstract description 35
- 238000000498 ball milling Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000758 substrate Substances 0.000 claims abstract description 23
- 239000002905 metal composite material Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 238000007650 screen-printing Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 229910021389 graphene Inorganic materials 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052733 gallium Inorganic materials 0.000 claims description 10
- 229910052738 indium Inorganic materials 0.000 claims description 10
- 229910052709 silver Inorganic materials 0.000 claims description 10
- 239000004332 silver Substances 0.000 claims description 10
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 8
- 229910000846 In alloy Inorganic materials 0.000 claims description 7
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 239000012056 semi-solid material Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- PFRUBEOIWWEFOL-UHFFFAOYSA-N [N].[S] Chemical compound [N].[S] PFRUBEOIWWEFOL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000007639 printing Methods 0.000 abstract description 11
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000012776 electronic material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910017083 AlN Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention provides a preparation method of a stretchable high-conductivity material, which comprises the following steps of (0.1-0.28) mixing nano silver powder, graphene derivative and liquid metal according to the mass ratio: (0.05-0.1): 1, mixing, and ball milling to obtain the nano silver powder-graphene-liquid metal composite conductive material. The composite conductive material can be used for printing a high-conductivity electronic circuit on the surface of a rigid or flexible substrate in a screen printing mode. The method is simple in preparation, can be used for batch preparation, does not need additional treatment, and can meet application requirements in the fields of wearable electronics, electronic skin, intelligent sensing, robots and the like.
Description
Technical Field
The invention relates to the technical field of electronic material preparation and device processing thereof, in particular to a preparation method and an application mode of a stretchable high-conductivity material.
Background
In recent years, electronic information technology has been developed, and electronic devices have been miniaturized and lightweight. Among them, the rise of wearable devices will certainly promote the development of flexible electronic devices into one of the mainstream directions in the electronics field. However, this key technical problem is faced here with the need to solve: (1) Flexible substrates, conventional ITO (indium tin oxide) materials have been a major factor in the industry for a long time due to their transparent, conductive properties. However, the problems of high cost, high impedance, poor light transmittance, poor flexibility and the like of the ITO material limit the application and development of the ITO material. (2) conductivity and stretchability of the conductive material. At present, an electronic circuit printed by adopting a screen printing or ink-jet printing mode mainly adopts high-elasticity-modulus high-conductivity particles such as nano silver powder, graphene, carbon nano tubes and the like as a conductive medium. The existence of these two types of problems has limited the further development of flexible electronics.
However, the preparation of conductive inks with metals (copper, silver, etc.) and carbon-based (graphene, carbon nanotubes, etc.) as conductive media has the following disadvantages: high elastic modulus, low elongation at break, and poor stretchability. Therefore, developing a novel conductive material with good stretchability and conductivity is a powerful force for promoting the development of flexible electronic technology. In recent years, room temperature liquid metal materials represented by gallium and gallium-based alloys have excellent electrical properties over conventional electronic materials, and are also expected to be applied to printing high-performance electronic circuits. However, the huge surface energy of the liquid metal and the insulating oxide film spontaneously formed on the surface thereof limit the printing effect and conductivity of the liquid metal on various substrates.
Therefore, the invention prepares the stretchable and high-conductivity material by compounding three materials, namely nano silver powder, graphene derivative and liquid metal, and the stretchable and high-conductivity composite conductive material can be obtained by a simple ball milling method and is used for printing a high-conductivity electronic circuit. Meanwhile, the method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the stretchable and high-conductivity electronic circuit prepared by the method can meet the application requirements of the civil fields of wearable electronics, electronic skin, intelligent sensing, robots and the like.
Disclosure of Invention
Based on the technical problems in the background art, the invention aims to provide a preparation method of a stretchable and high-conductivity material, which can obtain the high-conductivity composite conductive material through a simple ball milling mode. The composite conductive material is a high-viscosity semi-solid, and the viscosity is suitable for printing an electronic circuit on the surface of a rigid or flexible substrate by adopting a screen printing mode. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the high-conductivity electronic circuit prepared by the method can meet the application requirements of the civil fields of wearable electronics, electronic skin, intelligent sensing, robots and the like. The specific technical scheme is as follows:
the nano silver powder, the graphene derivative and the liquid metal are mixed according to the mass ratio of (0.1-0.28): (0.05-0.1): 1, mixing, and obtaining the nano silver powder-graphene-liquid metal composite conductive material after ball milling, wherein the ball milling rotating speed is 500-1,000 rpm, the ball milling time is 3-6 h, and vacuum pumping and argon filling are carried out once every 1 h before and during the ball milling. Organic gas is generated in the preparation process of the nano silver powder-graphene-liquid metal composite conductive material, and the organic gas needs to be removed in time to avoid oxidizing the liquid metal;
the silver solid content in the nano silver powder is more than 99%, and the particle size is less than 150 nm; the organic ligand on the surface of the nano silver powder volatilizes in the process of high-speed stirring, and the liquid metal is oxidized, so that the conductivity of the nano silver powder-graphene-liquid metal composite conductive material is reduced, and the nano silver powder with high silver solid content is required to be used;
the liquid metal is one or more of Ga-In and Ga-In-Zn alloy. The Ga-In alloy contains 65-95 parts by mass of metal gallium and 5-35 parts by mass of metal indium. The Ga-In-Zn alloy contains 65-95 parts by mass of metal gallium, 5-35 parts by mass of metal indium and 5-20 parts by weight of metal zinc.
The graphene derivative comprises one or more of graphene oxide, reduced graphene oxide, nitrogen-doped graphene, sulfur-doped graphene and nitrogen-sulfur co-doped graphene.
The nano silver powder-graphene-liquid metal composite conductive material is a high-viscosity composite semisolid material, and the viscosity is 8,000-12,000 cp.
The application mode of the stretchable high-conductivity material adopts a screen printing or slit coating mode to prepare an electronic circuit on the surface of a rigid substrate or a flexible substrate by using the nano silver powder-graphene-liquid metal composite conductive material.
The rigid substrate is a PCB, an alumina ceramic plate, an aluminum nitride ceramic plate, an aluminum substrate or a copper substrate.
The flexible substrate is PET, PVC, PI, PEN, teslin or photographic paper.
Electronic circuits fabricated on flexible substrates have a tensile elongation of 200% to 1,000%.
The stretchable and high-conductivity electronic circuit can meet application requirements of wearable equipment, electronic skin, intelligent sensing and flexible robots.
The beneficial effects of the invention are as follows: the high-conductivity composite conductive material can be obtained by a simple ball milling method through designing and preparing a preparation method of the stretchable high-conductivity material. The composite conductive material is a high-viscosity semi-solid, and the viscosity is suitable for printing an electronic circuit on the surface of a rigid or flexible substrate by adopting a screen printing mode. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the high-conductivity electronic circuit prepared by the method can meet the application requirements of the civil fields of wearable electronics, electronic skin, intelligent sensing, robots and the like.
Drawings
Fig. 1 is an SEM image of a nano silver powder-graphene-liquid metal semi-solid composite conductive material in example 1 of the present invention;
fig. 2 is a liquid metal SEM image of comparative example 1 in which nano silver powder and graphene derivative are not used according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more complete and clear with reference to the embodiments of the present invention and the accompanying drawings, it being apparent that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The problems of poor stretchability of electronic circuits printed by nano silver powder, poor conductivity of graphene, poor adhesiveness of liquid metal, easy surface oxidation and the like in the prior art limit the application of the nano silver powder in the flexible electronic field. In order to solve the problems, the invention provides a preparation method of a stretchable and high-conductivity material, and the high-conductivity composite conductive material can be obtained by a simple ball milling method. The composite conductive material is a high-viscosity semi-solid, and the viscosity is suitable for printing an electronic circuit on the surface of a rigid or flexible substrate by adopting a screen printing mode. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. In addition, the high-conductivity electronic circuit prepared by the method can meet the application requirements of the civil fields of wearable electronics, electronic skin, intelligent sensing, robots and the like.
Example 1
A preparation method of a stretchable high-conductivity material comprises the following steps:
the nano silver powder, the nitrogen-sulfur co-doped graphene and the liquid metal Ga-In alloy are mixed according to the mass ratio of 0.1:0.08:1, mixing, and ball milling to obtain the nano silver powder-graphene-liquid metal composite conductive material, wherein fig. 1 is an SEM image of the nano silver powder-graphene-liquid metal composite conductive material in embodiment 1 of the invention.
Wherein, the ball milling rotating speed is 500 rpm, the ball milling time is 6 h, and the vacuum pumping and argon filling are carried out once every 1 h before and during the ball milling.
The silver solid content in the nano silver powder is 99.95%, and the particle size is 50 nm.
The Ga-In alloy comprises 65 parts by mass of metal gallium and 35 parts by mass of metal indium;
the nano silver powder-graphene-liquid metal composite conductive material is a high-viscosity composite semisolid material, and the viscosity is 8,500 cp.
The nano silver powder-graphene-liquid metal composite conductive material is used for printing a high-conductivity electronic circuit on the surface of a PCB in a screen printing mode.
The high-conductivity electronic circuit can meet the application requirements of wearable electronics, electronic skin, intelligent sensing and robots.
Example 2
A preparation method of a stretchable high-conductivity material comprises the following steps:
nanometer silver powder, reduced graphene oxide and liquid metal Ga-In-Zn alloy are mixed according to the mass ratio of 0.28:0.1:1, mixing, and obtaining the nano silver powder-graphene-liquid metal composite conductive material after ball milling, wherein the ball milling rotating speed is 1,000 rpm, the ball milling time is 4 h, and vacuum pumping and argon filling are carried out once every 1 h before and during the ball milling.
The silver solid content in the nano silver powder is 99.7%, and the particle size is 120 nm.
The Ga-In-Zn alloy comprises 65 parts by mass of metal gallium, 35 parts by mass of metal indium and 5 parts by weight of metal zinc.
The nano silver powder-graphene-liquid metal composite conductive material is a high-viscosity composite semisolid material, and the viscosity is 12,000 cp.
The nanometer silver powder-graphene-liquid metal composite conductive material adopts a screen printing mode to print a high-conductivity electronic circuit on the surface of PET, and the prepared flexible electronic circuit has a tensile rate of 1,000%.
The high-conductivity electronic circuit can meet the application requirements of wearable electronics, electronic skin, intelligent sensing and robots.
Example 3
A preparation method of a stretchable high-conductivity material comprises the following steps:
the nano silver powder, the nitrogen doped graphene and the liquid metal Ga-In alloy are mixed according to the mass ratio of 0.28:0.05:1, mixing, and obtaining the nano silver powder-graphene-liquid metal composite conductive material after ball milling, wherein the ball milling rotating speed is 600 rpm, the ball milling time is 3 h, and vacuum pumping and argon filling are carried out at intervals of 1 h before and during the ball milling.
The silver solid content in the nano silver powder is 99.95%, and the particle size is 50 nm.
The Ga-In alloy comprises 95 parts by mass of metal gallium and 5 parts by mass of metal indium;
the nano silver powder-graphene-liquid metal composite conductive material is a high-viscosity composite semisolid material, and the viscosity is 11,000 cp.
The nano silver powder-graphene-liquid metal composite conductive material is used for printing a high-conductivity electronic circuit on the surface of the aluminum nitride ceramic plate in a screen printing mode.
The high-conductivity electronic circuit can meet the application requirements of wearable electronics, electronic skin, intelligent sensing and robots.
In another embodiment the aluminium nitride ceramic plate may be replaced by an aluminium oxide ceramic plate, an aluminium substrate or a copper substrate.
Example 4
A preparation method of a stretchable high-conductivity material comprises the following steps:
the nano silver powder, sulfur doped graphene and liquid metal Ga-In alloy are mixed according to the mass ratio of 0.1:0.1:1, mixing, and obtaining the nano silver powder-graphene-liquid metal composite conductive material after ball milling, wherein the ball milling rotating speed is 800 rpm, the ball milling time is 5 hours, and vacuum pumping and argon filling are carried out at intervals of 1 h before and during the ball milling.
The silver solid content in the nano silver powder is 99.5%, and the particle size is 100 nm.
The Ga-In-Zn alloy comprises 80 parts by mass of metallic gallium, 5 parts by mass of metallic indium and 20 parts by weight of metallic zinc.
The nano silver powder-graphene-liquid metal composite conductive material is a high-viscosity composite semisolid material, and the viscosity is 9,500cp.
The nanometer silver powder-graphene-liquid metal composite conductive material is prepared by printing a high-conductivity electronic circuit on the surface of PVC in a screen printing mode, and the stretchability of the prepared flexible electronic circuit is 950%.
The high-conductivity electronic circuit can meet the application requirements of wearable electronics, electronic skin, intelligent sensing and robots.
In another embodiment the PVC may be replaced by PI, PEN, teslin or photographic paper.
Comparative example 1
The technical scheme of the embodiment 1 is changed into that: the prepared electronic circuit has poor conductivity and adhesiveness without using nano silver powder or graphene compounded liquid metal. Fig. 2 is a liquid metal SEM image of comparative example 1 in which nano silver powder and graphene derivative are not used according to the present invention.
From the above, the stretchable and high-conductivity material prepared by the embodiment of the invention can be prepared by adopting a simple ball milling mode. The composite conductive material is a high-viscosity semi-solid, and the viscosity is suitable for printing an electronic circuit on the surface of a rigid or flexible substrate by adopting a screen printing mode. The method is simple to operate, can be used for batch preparation, and does not need an additional treatment process. The high-conductivity electronic circuit prepared by the method can meet the application requirements of the civil fields of wearable electronics, electronic skin, intelligent sensing, robots and the like.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (9)
1. The preparation method of the stretchable high-conductivity material is characterized by comprising the steps of mixing nano silver powder, graphene derivative and liquid metal according to the mass ratio of (0.1-0.28): (0.05-0.1): 1, mixing, and obtaining a nano silver powder-graphene derivative-liquid metal composite conductive material after ball milling, wherein the ball milling rotating speed is 500-1,000 rpm, the ball milling time is 3-6 h, and vacuum pumping and argon filling are carried out once every 1 h before and during the ball milling;
the graphene derivative comprises one or more of graphene oxide, reduced graphene oxide, nitrogen-doped graphene, sulfur-doped graphene and nitrogen-sulfur co-doped graphene.
2. The method for preparing a stretchable high conductive material according to claim 1, wherein the silver solid content in the nano silver powder is more than 99% and the particle size is less than 150 nm.
3. The method for producing a stretchable high-conductivity material according to claim 1, wherein the liquid metal is one or more of Ga-In and Ga-In-Zn alloy; the Ga-In alloy comprises 65-95 parts by mass of metal gallium and 5-35 parts by mass of metal indium; the Ga-In-Zn alloy contains 65-95 parts by mass of metal gallium, 5-35 parts by mass of metal indium and 5-20 parts by weight of metal zinc.
4. The method for preparing a stretchable high-conductivity material according to claim 1, wherein the nano silver powder-graphene derivative-liquid metal composite conductive material is a high-viscosity composite semisolid material, and the viscosity is 8,000-12,000 cp.
5. The application of the stretchable high-conductivity material prepared by the method of claim 1, wherein the electronic circuit is prepared on the surface of a rigid substrate or a flexible substrate by adopting a screen printing or slit coating mode to prepare the nano silver powder-graphene derivative-liquid metal composite conductive material.
6. The use according to claim 5, wherein the rigid substrate is a PCB board, an alumina ceramic board, an aluminum nitride ceramic board, an aluminum substrate or a copper substrate.
7. The use of claim 5 wherein the flexible substrate is PET, PVC, PI, PEN, teslin or photographic paper.
8. The use according to claim 5, wherein the electronic circuit is prepared on a flexible substrate with a stretchability of 200% to 1,000%.
9. The use of claim 5, wherein the electronic circuit is used for wearable electronics, electronic skin, smart sensing and flexible robots.
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