CN111768921A - Manufacturing method of self-assembled silver nanowire flexible transparent electrode based on gold nanoparticles - Google Patents
Manufacturing method of self-assembled silver nanowire flexible transparent electrode based on gold nanoparticles Download PDFInfo
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- CN111768921A CN111768921A CN201910260095.3A CN201910260095A CN111768921A CN 111768921 A CN111768921 A CN 111768921A CN 201910260095 A CN201910260095 A CN 201910260095A CN 111768921 A CN111768921 A CN 111768921A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
Abstract
The invention discloses a method for manufacturing a flexible transparent electrode based on gold nanoparticle self-assembled silver nanowires, which comprises the following steps: respectively taking out a certain amount of solution from the silver nanowire ethanol solution and the gold nanoparticle aqueous solution according to a preset proportion, putting the solution into a container, and uniformly fusing to form a mixed solution; placing the mixed solution on a centrifuge for adjusting, centrifuging and layering, removing the gold nanoparticles on the upper layer, taking the mixed solution on the lower layer, and adding ethanol to form an ethanol mixed solution; taking an ethanol mixed solution to a glass substrate, blade-coating the ethanol mixed solution on the glass substrate to form a liquid film on the glass substrate by the ethanol mixed solution, and repeatedly blade-coating to form a conductive film; and transferring the conductive film to a flexible transparent substrate to form a flexible transparent electrode. The invention firstly provides a method for manufacturing the transparent electrode by using gold nanoparticles to modify the silver nanowire lap joint nodes, so that the resistance of the flexible transparent electrode is reduced.
Description
Technical Field
The invention relates to the technical field of manufacturing processes of transparent electrodes, in particular to a manufacturing method of a flexible transparent electrode based on gold nanoparticle self-assembled silver nanowires.
Background
The electrode is an indispensable part of a circuit structure, the transparent electrode has a plurality of applications in the electronic field, and the transparent electrode has high light transmission capacity and can be used on a solar cell, so that sunlight can penetrate through the electrode to charge the cell, and the light sensing area of the solar cell is increased. Touch screens of devices such as mobile phones are also manufactured by transparent electrodes, and because the touch screens need to be displayed by interaction with people, the touch screens must have high transparency. Furthermore, some light emitting diodes are also useful as transparent electrodes.
At present, materials such as Indium Tin Oxide (ITO) and the like are mainly used for manufacturing the transparent electrode, but the transparent electrode is a fragile electrode and cannot be bent, and under the wave of wearable equipment and flexible electronic technology, the transparent electrode made of the materials cannot meet the requirements any more, so that the flexible transparent electrode technology is developed vigorously.
At present, the mainstream flexible transparent electrode is based on silver nanowires and graphene, the cost of the graphene is high, and the silver nanowire-based transparent electrode gradually occupies the market. The flexible electrode based on the silver nanowires is formed by coating the silver nanowires on a transparent substrate and mutually lapping the silver nanowires on the substrate to form a passage. This forms a flexible transparent electrode. There are two aspects to consider the performance parameters of a flexible transparent electrode, one is light transmittance and the other is resistivity. The better the light transmission effect, the lower the resistivity the better the performance of the flexible transparent electrode. But the junction where silver nanowires are bridged creates junction resistance. If the substrate is coated with many silver nanowires many times, the light transmittance is reduced. Therefore, how to effectively reduce the junction between the silver nano-sized electrodes becomes the technical key of the flexible transparent electrode.
Disclosure of Invention
The invention aims to provide a method for manufacturing a flexible transparent electrode based on gold nanoparticle self-assembled silver nanowires, aiming at the technical defects in the prior art.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a manufacturing method of a flexible transparent electrode based on gold nanoparticle self-assembly silver nanowires comprises the following steps:
respectively taking out a certain amount of solution from the silver nanowire ethanol solution and the gold nanoparticle aqueous solution according to a preset proportion, putting the solution into a container, and standing the solution to ensure that the solution is fully and uniformly fused to form a mixed solution;
placing the mixed solution on a centrifuge for adjusting, centrifuging and layering, removing the gold nanoparticles on the upper layer, taking the mixed solution on the lower layer, and continuously adding ethanol into the mixed solution on the lower layer to form ethanol mixed solution with a certain concentration;
taking a certain amount of prepared ethanol mixed solution to a glass substrate, blade-coating the ethanol mixed solution on the glass substrate to form a liquid film on the glass substrate and repeatedly blade-coating, so that ethanol solution fragments formed by breaking the liquid film spontaneously transport gold nanoparticles in the solution to the junctions lapped by the silver nanowires under the action of capillary force to form a conductive film;
and transferring the formed conductive film to a flexible transparent substrate to form a flexible transparent electrode.
The thickness of the liquid film was 20 microns thick.
The centrifuge was spun at 6000 rpm. The concentration of the silver nanowire ethanol solution is 20 g/ml, the concentration of the gold nanoparticle water solution is 0.2 g/ml, and the concentration of the ethanol mixed solution reaches 13.3 mg/ml.
The taking-out ratio of the silver nanowire ethanol solution to the nanoparticle aqueous solution is 1: 50.
the diameter of the gold particles is less than 10 nanometers, and the diameter of the silver nanowires is 90 nanometers.
Compared with the prior art, the invention has the beneficial effects that:
the invention firstly proposes a method for modifying silver nanowire lap joint nodes by using gold nanoparticles to manufacture the transparent electrode, so that the resistance of the flexible transparent electrode is reduced; the resistivity of the manufactured flexible transparent electrode is as low as 13.2 ohm per square millimeter, which is far lower than that of the electrode which is manufactured at present and reaches 39.4 ohm per square millimeter under the condition of the same light transmittance; by utilizing the self-assembly process mode, the process flow is very simple, and the post-treatment process of the traditional process is omitted.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a flexible transparent electrode based on gold nanoparticle self-assembled silver nanowires;
fig. 2 is a schematic diagram of the self-assembly of gold nanoparticles to silver nanowire junctions, enlarged.
In the figure: 1 is 20 g/ml silver nanowire ethanol solution, 2 is a silver nanowire with the diameter of 90 nanometers, 3 is ethanol, 4 is gold nanoparticle aqueous solution, 5 is gold nanoparticles with the average diameter smaller than 10 nanometers, 6 is a centrifugal machine, 7 is a glass substrate, 8 is a scraping bar, 9 is a flexible transparent electrode, 12 is a junction point where the silver nanowires are connected, 13 is a container, and 14 is a dropper.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the method for manufacturing a flexible transparent electrode based on gold nanoparticle self-assembled silver nanowire of the present invention comprises the following steps:
in the first step, raw material preparation needs gold nanoparticle aqueous solution 4 with the concentration of 0.2 g/ml and silver nanowire ethanol solution 1 with the concentration of 20 g/ml, wherein the diameter of gold particles 5 is less than 10 nanometers, and the diameter of silver nanowires 2 is 90 nanometers.
Mixing the gold nanoparticle solution and the silver nanowire solution according to the weight ratio of 50: 1, mixing for about 30 minutes, mixing uniformly, and then placing the mixed solution on a centrifuge 6 to perform centrifugation treatment for 10 seconds at a speed of 6000 rpm.
After removing the gold nanoparticles on the upper layer of the solution after the centrifugal treatment, ethanol is continuously added into the mixed solution until the concentration of the mixed solution is 13.3 mg/ml.
And secondly, forming a conductive film, taking out 10 microliters of the prepared solution, transferring the solution onto a glass substrate 7 by using a dropper 14, coating the solution on the glass substrate 7 by using a bar coating 8, so that the solution forms a liquid film with the thickness of about 20 micrometers on the glass substrate, and after repeated bar coating and blade coating for multiple times, the film is quickly broken into a plurality of small blocks under the action of tension, and repeatedly blade coating for multiple times. The ethanol solution fragments formed by cracking are equivalent to capillaries, and the gold nanoparticles 11 in the solution can be spontaneously transported to the junctions 12 connected with the silver nanowires through the action of capillary force, as shown in figure 2, and a conductive film is formed;
finally, the formed conductive film is transferred onto a flexible transparent material, such as PVA, to make a flexible transparent electrode 9.
The process technology of the invention can lead the gold nanoparticles to be decorated on the nodes connected with the silver nanowires, thereby reducing the node resistance of the silver nanowires.
The gold nanoparticles self-assemble on the junctions where the silver nanowires are connected because of capillary force. After each bar coating, a film of ethanol solution with the thickness of about 20 microns is formed on the glass substrate, the ethanol film can be broken into a plurality of small pieces of ethanol solution instantly, and the small pieces of ethanol solution can be gathered around the junction where the nanowire and the silver wire are connected due to the influence of surface tension. The ethanol solution of the fragments can transport gold nanoparticles 11 in the solution to the periphery of a junction 12 lapped by the silver nanowires 10 by capillary force just like a capillary, so that self-assembly modification is formed.
It should be noted that the raw materials used in the method of the present invention include 0.2 g/ml gold nanoparticle aqueous solution 4, wherein the diameter of the gold particles 5 is less than 10 nm, and 20 g/ml silver nanowire ethanol solution 1, wherein the diameter of the silver nanowires 2 is 90 nm, which can be purchased directly from Nanjing Pioneer NanoC.
It should be noted that the self-assembly of gold nanoparticles in the method of the present invention is a spontaneous behavior, which does not require human control and operation, and the assembly condition is also a probabilistic behavior.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A manufacturing method of a flexible transparent electrode based on gold nanoparticle self-assembly silver nanowires is characterized by comprising the following steps:
respectively taking out a certain amount of solution from the silver nanowire ethanol solution and the gold nanoparticle aqueous solution according to a preset proportion, putting the solution into a container, and standing the solution to ensure that the solution is fully and uniformly fused to form a mixed solution;
placing the mixed solution on a centrifuge for adjusting, centrifuging and layering, removing the gold nanoparticles on the upper layer, taking the mixed solution on the lower layer, and continuously adding ethanol into the mixed solution on the lower layer to form ethanol mixed solution with a certain concentration;
taking a certain amount of prepared ethanol mixed solution to a glass substrate, blade-coating the ethanol mixed solution on the glass substrate to form a liquid film on the glass substrate and repeatedly blade-coating, so that ethanol solution fragments formed by breaking the liquid film spontaneously transport gold nanoparticles in the solution to the junctions lapped by the silver nanowires under the action of capillary force to form a conductive film;
and transferring the formed conductive film to a flexible transparent substrate to form a flexible transparent electrode.
2. The method for manufacturing the gold nanoparticle self-assembled silver nanowire-based flexible transparent electrode as claimed in claim 1, wherein the thickness of the liquid thin film is 20 μm thick.
3. The method for manufacturing the gold nanoparticle self-assembled silver nanowire-based flexible transparent electrode as claimed in claim 1, wherein the centrifuge is rotated at 6000 rpm.
4. The method for manufacturing the gold nanoparticle self-assembly silver nanowire-based flexible transparent electrode as claimed in claim 1, wherein the concentration of the silver nanowire ethanol solution is 20 g/ml, the concentration of the gold nanoparticle aqueous solution is 0.2 g/ml, and the concentration of the ethanol mixed solution is 13.3 mg/ml.
5. The method for manufacturing the gold nanoparticle self-assembly silver nanowire-based flexible transparent electrode as claimed in claim 1, wherein the ratio of the silver nanowire ethanol solution to the nanoparticle aqueous solution is 1: 50.
6. the method for manufacturing the gold nanoparticle self-assembled silver nanowire-based flexible transparent electrode as claimed in claim 1, wherein the diameter of the gold particles is less than 10 nm, and the diameter of the silver nanowires is 90 nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115995311A (en) * | 2023-03-21 | 2023-04-21 | 浙江大华技术股份有限公司 | Silver nanowire transparent conductive film and preparation method and application thereof |
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| JP2009129882A (en) * | 2007-11-28 | 2009-06-11 | Konica Minolta Holdings Inc | Transparent conductive coat, transparent conductive film, and flexible transparent plane electrode |
| CN102044309A (en) * | 2009-10-21 | 2011-05-04 | 财团法人工业技术研究院 | Conductive material shaped through optical energy or heat energy, method for preparing conductive material and conductive composition |
| JP2013187014A (en) * | 2012-03-07 | 2013-09-19 | Panasonic Corp | Conductive optical member, method for manufacturing the same, and touch panel provided with the same |
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| CN115995311A (en) * | 2023-03-21 | 2023-04-21 | 浙江大华技术股份有限公司 | Silver nanowire transparent conductive film and preparation method and application thereof |
| CN115995311B (en) * | 2023-03-21 | 2023-05-23 | 浙江大华技术股份有限公司 | Silver nanowire transparent conductive film and preparation method and application thereof |
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