BE1030698A1 - METHOD FOR STRUCTURING CONDUCTIVE NANO MATERIALS BASED ON LASER PRINTING TECHNOLOGY, CONDUCTIVE PATTERNS AND APPLICATION THEREOF - Google Patents

Abstract

The present invention discloses a method for patterning conductive nano-materials, a conductive pattern and an application thereof, the method comprising: printing a toner on a printing substrate using a laser printing method into a predetermined pattern; depositing a conductive nanomaterial on the pre-deposited substrate to form a conductive film; covering the preset pattern of the printing substrate with the pre-deposited substrate, hot pressing at 110-130°C; separating the pre-deposited substrate from the printing substrate to form a conductive pattern on the printing substrate. The method overcomes the limitations of laser printers due to liquid electronic ink, enabling the use of laser printers in the field of flexible printed electronics, and provides a dry patterning method without masking to obtain a conductive pattern with specific shapes , which can be further applied in the production of conductive circuits for flexible electronics.

Description

METHOD FOR STRUCTURING LEADERS

NANO MATERIALS BASED ON LASER PRINTING TECHNOLOGY,

CONDUCTIVE PATTERNS AND APPLICATION THERE OF

TECHNICAL FIELD

The present invention relates to the technical field of manufacturing the flexible

Electronics, in particular a method for structuring conductive nano-materials, a conductive pattern and an application thereof.

STATE OF THE ART

Currently, the printing processes for printed electronics are mainly used

Inkjet printing, screen printing, gravure printing and planographic printing etc. are used. At the

Pressure of conductive nano-materials dispersed in the liquid phase have the

Inkjet printing and screen printing the problem that the conductive ink the nozzles and

Mesh holes clogged, and gravure printing and planographic printing have the problems of missing patterns and lower reliability in transferring conductive ink.

In addition, the conductive ink, printing device and printing substrate must be in

In terms of process matching, electronic printing devices are more expensive compared to conventional printing devices and that

The process is more complex than traditional printing technology.

The laser printer is a more popular office printing device with the advantages that it has a low price, can print patterns on hydrophobic substrates, prints patterns quickly.

A laser printer works by selectively using an organic photoconductor drum

Laser light is irradiated, creating an electrostatic latent image that then

Toner attracts to form a pattern. These patterns are then transferred to the printing substrate, which is finally heat pressed by the fuser roller to create a stable

to form patterns on the substrate. The toner used for printing is mainly composed of fusible resin, carbon black and magnetic powder. The fuser rollers melt the toner and press it onto the printing substrate so that the toner is

Cooling adheres to the substrate. However, the printing methods currently used in the field of printed electronics are all based on the use of liquid electronic ink, which makes the use of laser printers in the field of printed

Electronics is severely limited because laser printers cannot print liquid electronic ink directly.

CONTENT OF THE PRESENT INVENTION

The purpose of the present invention is to provide a method for structuring conductive nano-materials, a conductive pattern and an application thereof

to provide the process overcoming the limitations of laser printers due to liquid electronic ink, thereby enabling the use of laser printers in the field of flexible printed electronics, and to provide a dry patterning process without masking to form a conductive pattern with specific shapes, which can be further applied in the production of conductive circuits for flexible electronics.

The present invention is realized by the following technical solution:

In a first aspect, the present invention provides a method for structuring conductive nano-materials, comprising:

Printing a toner containing a hot melt resin onto a printing substrate

Using a laser printing process to produce a predetermined pattern;

depositing a conductive nanomaterial on the pre-deposited substrate to form a conductive film;

Covering the preset pattern of the printing substrate with the pre-deposited substrate, hot pressing at 110-130°C, with the printing substrate in one

Seal the area in contact with the preset pattern

forms connecting body with the conductive nano material on the conductive film;

Separating the pre-deposited substrate from the printing substrate so that the conductive nano-material on the sealed connection body separates from the pre-deposited one

Substrate peels away to form a conductive pattern on the printing substrate.

Furthermore, in a preferred embodiment of the present invention

separating the pre-deposited substrate from the printing substrate, the conductive nano-material retained on the pre-deposited substrate, a conductive pattern transferred to another flexible substrate or elastic substrate to form a flexible conductive body or an elastic conductive body with the conductive

to obtain samples.

Furthermore, in a preferred embodiment of the present invention, the conductive nano-material comprises at least one of silver nanoparticles, silver nanowires,

Copper nanoparticles, copper nanowires, graphene, carbon nanotubes, two-dimensional transition metal carbides and nitrides.

Further, in a preferred embodiment of the present invention, the conductive film is formed by a vacuum film deposition method

Vacuum filtration process or a coating process produced.

Furthermore, in a preferred embodiment of the present invention, the

Conductive film thickness 0.05-10um.

Further, in a preferred embodiment of the present invention, the printing substrate and the pre-deposited substrate include paper, release paper,

Filter membrane, plastic substrate or glass substrate.

A conductive pattern fabricated using the above patterning method, where the resistance of the conductive pattern is 0.1-10Q.

An application of the above conductive pattern in a flexible electronic conductive

Circuit.

Compared to the prior art, the present invention has at least the following technical effects:

The method provided by the present application for

Structuring conductive nano-materials uses a laser printer to do the

To print patterns on an ordinary printing substrate, using a pre-deposited one

Substrate on which the conductive nano-material is deposited, covering the printing substrate, which is hot-pressed at 110-130°C. Since the one used for the laser printer

Toner contains hot-melt resin, during hot-pressing the conductive material on the pre-deposited substrate is transferred to the printing substrate in the hot-pressed state. Since the pattern is formed by the toner, the hot-melt resin in the toner melts during the hot-pressing process, and the part of the conductive nano-material on the pre-deposited substrate that is in contact with the pattern is close to it

Printing substrate bound and easily detaches from the pre-deposited substrate during the subsequent separation process and adheres to the printing substrate, resulting in a

Printing substrate is formed with a conductive pattern. The part of the executive

Nano-material that is not in contact with the pattern is not bonded to the printing substrate because there is no binding force of the hot-melt resin, and in the subsequent separation process this part of the conductive nano-material is still retained and placed on the pre-deposited substrate a certain leading one

Pattern which is then transferred to another viscoelastic substrate to obtain a viscoelastic substrate with the conductive pattern.

The present invention uses the one printed with the office desktop laser printer

Pattern to structure the conductive nano material and realizes for the first time the

Application of laser printers in the field of flexible printed electronics, mainly using the laser printer to form a pattern, and the

Property of the hot-melt resin contained in the toner, which can be easily heated and melted, is used to transfer the conductive material previously deposited on another substrate to a printing substrate in the hot-pressed state, at the same time the structuring of the conductive nano-material on the

Printing substrate and the pre-deposited substrate, and the resistance of the formed conductive pattern is 0.1-10 Q. The pattern accuracy and the minimum

Graphic size of the present invention is determined by the printing accuracy of the

Laser printer limited.

Furthermore, the method of the present invention enables the

Provides the user with a conductive film on a pre-deposited substrate, allowing the user to create a conductive pattern in the office through a laser printer

Paper can be designed easily, making it easy and convenient to use.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a flowchart of an embodiment 1 of the present

Invention.

DETAILED DESCRIPTION

The embodiments of the present invention are described below

In connection with the exemplary embodiments, the person skilled in the art can understand that the following exemplary embodiments only serve to illustrate the present invention and not as a limitation

The scope of the present invention should be considered in the

Specific conditions not specified in the embodiments are carried out in accordance with conventional or manufacturer-recommended conditions and the reagents or devices used, for which the manufacturer is not specified, are conventional products that are commercially available.

The present invention uses the following technical solution: a method for structuring conductive nano-materials in the present

Embodiment comprising the following steps:

Step S1: printing a toner containing a hot-melt resin onto a printing substrate using a laser printing method into a predetermined pattern; The toner used in printing by a laser printer is mainly composed of hot melt resin, carbon black, magnetic powder, etc

Hot melt resin, also known as hot melt adhesive, a malleable

is an adhesive whose physical state changes with temperature within a certain temperature range, and the hot melt resin has the characteristics of high adhesive strength and rapid response to a temperature increase. In the

During the printing process, the laser printer also uses the property of hot melt resin that it has an increased viscosity when preheated to print the toner on paper.

In this step, the printing substrate includes all substrates that the laser printer can print on

Can print patterns, especially paper, release paper, filter membrane,

Plastic substrates or glass substrates. In this solution, the printing substrate can be hydrophobic or hydrophilic.

Step S2: Depositing a conductive nano-material on the pre-deposited one

substrate to form a conductive film; Covering the preset pattern of the

Printing substrate with the pre-deposited substrate, hot pressing at 110-130°C,

wherein the printing substrate forms a sealed connection body with the conductive nanomaterial on the conductive film in a region in contact with the preset pattern;

Furthermore, the conductive nano material comprises at least one of silver nanoparticles,

silver nanowires, copper nanoparticles, copper nanowires, graphene,

Carbon nanotubes, two-dimensional transition metal carbides and nitrides.

Such conductive nano-materials have excellent electrical conductivity and, once patterned, can be used to produce a variety of flexible circuits. The conductive nano material is preferably

Silver nanoparticles, silver nanowires, copper nanoparticles, copper nanowires, graphene,

Carbon nanotubes, two-dimensional transition metal carbides or nitrides.

More preferably, the conductive nanomaterial is a thin film of silver nanowires and

Graphs mixed in a specific ratio. This is more preferred

Ratio of silver nanowires to graphene 2:1 by volume.

Further, the pre-deposited substrate may be any substrate onto which the conductive nano-material can be deposited, including paper, oil paper,

Filter membrane, plastic substrate or glass substrate, and the surface of the substrate can be hydrophobic or hydrophilic. The pre-deposited substrate is preferably a filter membrane and a plastic substrate.

Further, the conductive film is formed by a vacuum film deposition method

Vacuum filtration process or a coating process, preferably by a

Vacuum filtration method, and the conductive film has a thickness of 0.05-10 µm (preferably 0.1-0.6 µm).

Furthermore, the temperature when covering the preset pattern is

Printing substrate with the pre-deposited substrate for hot pressing 110-130 ° C, preferably 115-125 ° C, more preferably 120 ° C. This melts during the hot pressing process

Hot melt resin in the toner, as the pattern is formed by the toner, that melts

Hot melt resin in the toner during the hot pressing process and the part of the conductive

Nano material on the conductive film in contact with the pattern is tightly bonded to the printing substrate. The part of the conductive nano material that does not correspond to the

Pattern is in contact will not be bound to the printing substrate as it has no

binding power of the hot-melt resin.

Step S3: Separating the pre-deposited substrate from the printing substrate so that the conductive nano-material at the sealed connection body peels off the pre-deposited substrate to form a conductive pattern on the printing substrate.

Further, after separating the pre-deposited substrate from the printing substrate, the conductive nanomaterial retained on the pre-deposited substrate forms a conductive pattern, which is transferred to a viscoelastic substrate to obtain a viscoelastic substrate having the conductive pattern.

The detailed embodiments of the present invention are explained in more detail below. It goes without saying that the detailed information described here

Embodiments are intended to illustrate the present invention only, rather than limit the present invention.

Example 1

The present exemplary embodiment provides a method for structuring conductive

Nano-materials are available, the process flow of which is as shown in Figure 1, comprising: (1) printing a pattern on paper (i.e. printing substrate) with a laser printer; (2) Depositing the aqueous silver nanowire dispersion by vacuum extraction on a filter membrane, which is a hydrophilic polyvinylidene fluoride (PVDF) filter membrane, with the original concentration of the

Silver nanowire ethanol dispersion is 10 mg/ml, and withdrawal of 50 µl of the

Silver nanowire ethanol dispersion, which is mixed with 30 ml of water to form the liquid for the

Vacuum extraction is further diluted. The filter membrane is dried on a hot plate at 50 degrees Celsius to form a conductive film with a thickness of 5 µm; (3) The textured side of the paper is laminated to the silver nanowire side of the filter membrane, then hot pressing is done by a laminating roller (the temperature is set at 120°C). The silver nanowires on the filter membrane are connected to a

Success rate of almost 99% transferred to the printed pattern. In the pattern on the

Some fine lines of silver-free nanowires can be seen on the paper;

(4) In order to increase the transfer success rate to almost 100%, an aqueous graphene dispersion (stock concentration 0.5 mg/mL) is added to the vacuum filtration liquid and mixed with the silver nanowires. 20 µl of the aqueous

Graphene dispersion are removed. The graph is used to connect with the

Silver nanowires and can improve fidelity during the transmission process.

The silver nanowires are glued to the printed pattern for patterning, and in addition, the silver nanowires are patterned on the filter membrane and can be transferred to other flexible substrates. The ones structured on paper

Silver nanowires can be used as a conductive connector or electrode for paper-based

Electronics are used and structured on the filter membrane

Silver nanowires are further attached to the flexible substrate as an electrode or

Transfer connecting cable for the flexible electronics. The resulting conductive

Patterns have resistance in the range of 0.1-3©. The structured ones

Silver nanowires are used as electrodes or connecting lines for the flexible

Electronics used.

Example 2

The present exemplary embodiment provides a method for structuring conductive

Nano-materials are available, comprising: (1) Printing a pattern on paper with a laser printer. (2) Coating a rigid substrate with the silver nanowire ethanol dispersion, the rigid substrate having a hydrophobic surface, the original

Concentration of the silver nanowire ethanol dispersion is 10 mg/ml, and removal of 50 µl of the silver nanowire ethanol dispersion, which is further diluted with 0.5 mL of ethanol to form the liquid for coating. The one applied to the rigid substrate

Liquid film is naturally dried to form a conductive film with a thickness of 0.5 µm. (3) The side of the rigid substrate provided with the silver nanowires is laminated to the textured side of the paper, then hot pressing is carried out by a

Laminating roller (the temperature is set to 120°C). The silver nanowires are transferred to the printed pattern with a success rate of almost 99%. Some fine lines of silver-free nanowires can be seen in the pattern on the paper. Around the

To increase the success rate of the transfer to almost 100%, the fluid is used for the

An aqueous graphene-ethanol dispersion (stock concentration 0.5 mg/mL) was added to the coating and mixed with the silver nanowires. 20 µl of the aqueous

Graphene-ethanol dispersion are removed. The graphene is used to connect to the silver nanowires and can improve the fidelity during the transmission process.

The silver nanowires are glued to the printed pattern for patterning, and in addition, the silver nanowires are patterned on the rigid substrate. The leading one

Pattern on the rigid substrate can further be transferred to another elastic substrate. The silver nanowires patterned on the paper can be used as a conductive interconnector or electrode for paper-based electronics, and the silver nanowires patterned on the rigid substrate are further transferred to the flexible substrate as an electrode or interconnection line for the flexible electronics.

Example 3

The present exemplary embodiment provides a method for structuring conductive

Nano-materials are available, comprising: (1) printing a pattern on release paper with a laser printer; (2) Depositing an aqueous carbon nanotube dispersion onto a

Plastic substrate using a roll coating process to form a conductive film with a thickness of 0.05um. The concentration of the aqueous carbon nanotube dispersion is 10 mg/ml, and 50 μl of the aqueous carbon nanotube dispersion is removed, which is further diluted with 30 mL of water to form the liquid for the coating; and (3) The textured side of the release paper is laminated to the carbon nanotube side on the plastic substrate, then hot pressing by a laminating roller (the temperature is set at 115°C). The carbon nanotubes on the

Plastic substrates are printed on this with a success rate of almost 99%

Transfer pattern.

The carbon nanotubes are used for structuring on the printed pattern of the

Separating paper is glued, and in addition the carbon nanotubes are glued to the

Plastic substrate structured and can be transferred to other flexible substrates. The carbon nanotubes structured on the release paper can be used as a conductive connection part or electrode for paper-based electronics, and the carbon nanotubes structured on the plastic substrate are further transferred to the flexible substrate as an electrode or connection line for the flexible electronics. The resulting conductive patterns have a resistance in the range of 5-6 © The structured carbon nanotubes are used as electrodes or

Connecting cables used for flexible electronics.

Example 4

The present exemplary embodiment provides a method for structuring conductive

Nano-materials are available, comprising: (1) printing a pattern on a plastic substrate with a laser printer. (2) Applying the aqueous copper nanowire dispersion to a rigid substrate (glass substrate) having a hydrophilic surface, the original

Concentration of the aqueous copper nanowire dispersion is 10 mg/ml, and

Withdrawal of 50 µl of the aqueous copper nanowire dispersion with 0.5 ml of water

Liquid for the coating is further diluted. The liquid film applied to the rigid substrate is naturally dried to form a conductive film with a

Thickness of 1 um to form. (3) The side of the rigid substrate provided with the copper nanowires is laminated to the patterned side of the plastic substrate, then hot pressing is carried out by a laminating roller (the temperature is set at 125°C). The copper nanowires are applied to the printed pattern of the with a success rate of almost 100%

Transfer plastic substrate.

The copper nanowires are used for structuring on the printed pattern of the

Plastic substrate glued, and in addition the copper nanowires are rigid on the

Substrate structured. The conductive pattern on the rigid substrate can further be transferred to another elastic substrate. The resulting conductive patterns have a resistance in the range of 3-4 Q. Those patterned on the plastic substrate

Copper nanowires can be used as a conductive connector or electrode for plastic substrate-based electronics, and the copper nanowires patterned on the rigid substrate are further applied to the flexible substrate as an electrode or

Transfer connecting cable for the flexible electronics.

It should be noted that the above content is only preferred

represents embodiments of the present invention and is not intended to serve the purpose

Limit the scope of the present invention. All under thoughts and

Changes made to the principles of the present invention are equivalent

Substitutions and improvements are to be considered within the scope of the present invention.

Claims (8)

Expectations 1. A method for patterning conductive nano-materials, characterized in that it comprises: printing a toner containing a hot-melt resin onto a printing substrate using a laser printing method into a predetermined pattern; depositing a conductive nanomaterial on the pre-deposited substrate to form a conductive film; Covering the preset pattern of the printing substrate with the pre-deposited substrate, hot pressing at 110-130°C, the printing substrate forming a dense bonding body with the conductive nano-material on the conductive film in a region in contact with the preset pattern ; Separating the pre-deposited substrate from the printing substrate such that the conductive nanomaterial at the sealed interconnect body peels off the pre-deposited substrate to form a conductive pattern on the printing substrate. 2. A method for structuring conductive nano-materials according to claim 1, characterized in that after separating the pre-deposited substrate from the printing substrate, the conductive nano-material retained on the pre-deposited substrate forms a conductive pattern which is applied to another flexible substrate or elastic substrate is transferred to obtain a flexible conductive body or an elastic conductive body with the conductive pattern. 3. A method for structuring conductive nano-materials according to claim 1 or 2, characterized in that the conductive nano-material comprises at least one of silver nanoparticles, silver nanowires, copper nanoparticles, copper nanowires, graphene, carbon nanotubes, two-dimensional transition metal carbides and nitrides. 4. A method for structuring conductive nano-materials according to claim 1 or 2, characterized in that the conductive film is produced by a vacuum film deposition process, a vacuum filtration process or a coating process. 5. A method for structuring conductive nano-materials according to claim 4, characterized in that the conductive film has a thickness of 0.05-10 µm. 6. A method for structuring conductive nano-materials according to claim 1 or 2, characterized in that the printing substrate and the pre-deposited substrate comprise paper, release paper, filter membrane, plastic substrate or glass substrate. 7. Conductive pattern which is produced using a structuring method according to one of claims 1 to 6, characterized in that the conductive pattern has a resistance of 0.1-10 Q. 8. Application of the conductive pattern according to claim 7 in a flexible electronic conductive circuit.