DE202021105684U1 - A system for producing a transparent conductive film - Google Patents

Abstract

A system for producing a transparent conductive film, the system comprising:
a spin coater configured to prepare AgNWs and CuNPs on a PI substrate at 2500 rpm for 1 minute, with AgNWs and CuNPs being dispersed in IPA overnight;
an oven for annealing the spin-coated substrate at 50 ° C. for 10 minutes to ensure the adhesion of the AgNW + CuNPs to the substrate; and
a pair of silver paste contact electrodes applied to both vertical sides of the spin-coated PI substrate.

Description

FIELD OF THE INVENTION

The present invention relates to the system for producing transparent, conductive films with hybrid Ag nanowires (AgNW - Silver NanoWires) and copper nanoparticles (CuNP - Copper Nano Particles).

BACKGROUND OF THE INVENTION

The touch panel and the transparent heating and display panels in electronics require an optical permeability of more than 80% and a sheet resistance of less than 150 Ω / m².

Transparent thin film conductors are promising, inexpensive, and potential candidates these days for various industrial areas such as optoelectronic devices, transparent heating pads, organic display panels, and windows. Conventional transparent indium tin oxide (ITO) faces many challenges, such as: B. high rigidity, relatively high investment costs and global scarcity. Today, metallic nanowires have shown their potential role in industrial applications due to their excellent optical and electrical properties compared to ITO-based devices.

In addition, metallic nanowires can be easily processed using a number of chemical and physical methods. In sharp contrast, advanced new nanomaterials such as carbon nanotubes (CNT), graphene or a combination of these materials with metallic or non-metallic nanowires have been extensively researched in recent years. However, due to their fragility, CNT and graphene can pose a problem for flexible electronics compared to metallic nanowires.

Although these hybrid transparent AgNW composite films are ideal for TCF heating applications, their maximum achievable temperature (T) are limited, since T α P. The maximum temperature reached by hybrid AgNW heaters is up to 100 ° C or in some Felling at 225 ° C.

In order to solve this problem, various decoration or coating methods have been developed for the electrode based on silver nanowire. Heating elements based on AgNWs have been demonstrated in various applications, e.g. as composite heating elements, stretchable heating elements and heating elements for soft actuators. Recently, hybrid AgNW networks have shown lower sheet resistance and high permeability of a TCF, but the contact resistance increases rapidly, leading to a rapid breakdown. The addition of valuable nanoparticles to AgNW can drastically increase manufacturing costs. Cheaper materials, transition elements such as Ni-based alloys, are of interest because they do not react with AgNW and are resistant to oxidation even at high temperatures.

In view of the above, it becomes clear that a system for producing transparent conductive films is required.

SUMMARY OF THE INVENTION

The present disclosure aims to provide a system for making a transparent conductive film using a hybrid of silver nanowires and copper nanoparticles.

In one embodiment, a system for making a transparent conductive film is disclosed. The system includes a spin coater configured to produce AgNWs and CuNPs on a PI substrate at 2500 rpm for 1 minute with AgNWs and CuNPs dispersed in IPA overnight. The system further comprises an oven in which the spin-coated substrate is tempered for 10 minutes at 50 ° C. in order to ensure the adhesion of the AgNW + CuNPs to the substrate. The system also includes a pair of contact electrodes made from a silver paste that is applied to the two vertical sides of the spin-coated PI substrate.

In one embodiment, the substrate is made of polyimide, polymethyl methacrylate, polycarbonate, etc.

In one embodiment, the samples are made with different ratios (AgNW: CuNPs) in wt .-% such as A1 (1: 0), A2 (0.7: 0.3), A3 (0.5: 0.5) and A4 (0.3: 0.7).

In one embodiment, the sample with AgNW and CoNPs in the ratio 0: 1 showed no electrical continuity and was discarded.

In one embodiment, a transparent conductive nano heater is made from AgNW and CuNPs.

In one embodiment, a combined approach with an optimal ratio of AgNW-CuNPs, preferably 0.5: 0.5 in% by weight, is selected in order to achieve a maximum Joule heating temperature of more than 300 ° C, preferably 360 ° C, and to achieve a sheet resistance of less than (40 Ω / qm).

In one embodiment, a maximum breakdown voltage of 20 V is achieved, which corresponds to a temperature of 360 ° C.

In one embodiment, the highest permeability of 85% is achieved without a breakthrough up to 360 ° C. occurring.

In one embodiment, the PI substrate is cleaned with IPA and acetone in a container.

The aim of the present invention is to develop a system for producing transparent conductive films.

Another object of the present invention is to achieve an optical transmission greater than 82-85%.

Another object of the present invention is to provide a fast and inexpensive transparent conductive nanoheater made of AgNW and CuNPs.

In order to further clarify the advantages and features of the present invention, a more detailed description of the invention will be given by reference to certain embodiments which are illustrated in the accompanying drawings. It is believed that these drawings depict only typical embodiments of the invention and are therefore not to be considered as limiting the scope of the invention. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

Figure list

• 1 zeigt ein Blockdiagramm eines Systems zur Herstellung einer transparenten leitfähigen Folie gemäß einer Ausführungsform der vorliegenden Erfindung;

These and other features, aspects and advantages of the present invention will be better understood after reading the following detailed description with reference to the accompanying drawings, in which like characters represent like parts in the drawings, wherein:

• 1 Fig. 13 is a block diagram of a system for making a transparent conductive sheet according to an embodiment of the present invention;

Those skilled in the art will understand that the elements in the drawings are shown for simplicity and are not necessarily drawn to scale. For example, the flowcharts illustrate the process using key steps to improve understanding of aspects of the present invention. Furthermore, one or more components of the apparatus may be represented in the drawings by conventional symbols, and that the drawings show only the specific details relevant to an understanding of the embodiments of the present invention, rather than the drawings that are easily recognizable to those skilled in the art familiar with the present description.

DETAILED DESCRIPTION:

In order to promote the understanding of the invention, reference will now be made to the embodiment shown in the drawings and this will be described with specific words. It should be understood, however, that it is not intended to limit the scope of the invention, and such changes and other modifications to the illustrated system and such further applications of the principles of the invention illustrated therein are contemplated as would become apparent to one skilled in the art Invention would normally come up.

It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be limiting.

When “an aspect”, “another aspect” or the like is mentioned in this description, this means that a specific feature, a specific structure or a specific property, which is described in connection with the embodiment, in at least one embodiment of the present invention. Therefore, the terms “in one embodiment,” “in another embodiment,” and similar terms in this specification may or may not refer to the same embodiment.

The terms “comprises,” “containing,” or other variations thereof are intended to cover non-exclusive inclusion, so that a method or method that includes a list of steps may not only include those steps, but may include other steps that are not are expressly listed or belong to such a process or method. Likewise, one or more devices or subsystems or elements or structures or components that are introduced with “comprises ... a” do not, without further restrictions, include the existence of other devices or other subsystems or other elements or other structures or other components or additional devices or additional subsystems or additional elements or additional structures or additional components.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The system, methods, and examples given herein are illustrative only and are not intended to be limiting.

In 1 Figure 3 is a block diagram of a system for making a transparent conductive sheet in accordance with an embodiment of the present invention. The system 100 comprises a spin coating apparatus 102 used for the fabrication of AgNWs and CuNPs on a PI substrate 104 configured for 1 minute at 2500 rpm. The AgNWs and CuNPs are dispersed in IPA overnight.

In one embodiment is an oven 106 configured so that the spin coated substrate 104 Tempering is carried out for 10 minutes at 50 ° C. in order to ensure that the AgNW + CuNPs adhere to the substrate 104 to ensure

In one embodiment, a pair of contact electrodes 108 made by a silver paste applied to the two vertical sides of the spin coated PI substrate 104 is applied.

In one embodiment, the substrate is made 104 made of polyimide, polymethyl methacrylate, polycarbonate and so on.

In one embodiment, the samples are made with different ratios (AgNW: CuNPs) in wt .-% such as A1 (1: 0), A2 (0.7: 0.3), A3 (0.5: 0.5) and A4 (0.3: 0.7).

In one embodiment, the sample with AgNW and CoNPs in the ratio 0: 1 showed no electrical continuity and was discarded.

In one embodiment, a transparent conductive nano heater is used 110 made from AgNW and CuNPs.

In one embodiment, a combined approach with an optimal ratio of AgNW-CuNPs, preferably 0.5: 0.5 in% by weight, is selected in order to achieve a maximum Joule heating temperature of more than 300 ° C, preferably 360 ° C, and to achieve a sheet resistance of less than (40 Ω / qm).

In one embodiment, a maximum breakdown voltage of 20 V is achieved, which corresponds to a temperature of 360 ° C.

In one embodiment, the highest permeability of 85% is achieved without a breakthrough up to 360 ° C. occurring.

In one embodiment, the PI substrate is 104 cleaned with IPA and acetone in a container.

The transparent electrode film manufacturing system has an excellent optical transmittance of more than 82-85%, while the sheet resistance is less than 35-40 Ω / m², and the maximum temperature reaches 360 ° C before breakdown at 20-22V; with the complexation (hybrid) technology of the silver nanowire and the transparent electrode film produced by it.

In one embodiment, the transparent conductive nano heater is 110 made from AgNW and CuNPs. The substrate 104 of the transparent conductive nano heater 110 is made of polyamide.

In one embodiment, a compound of a nanowire and nonoparticles is produced according to an embodiment of the present invention. The samples are with different ratios (AgNW: CuNPs) in wt .-% as A1 (1: 0), A2 (0.7: 0.3), A3 (0.5: 0.5) and A4 (0, 3: 0.7). The sample with AgNW: CoNPs = 0: 1 showed no electrical continuity and is discarded.

In one embodiment, the combined approach with an optimal ratio of AgNW-CuNPs, preferably 0.5: 0.5 in% by weight, is used to achieve a maximum Joule heating temperature of more than 300 ° C, preferably 360 ° C, and to achieve a sheet resistance of less than (40 Ω / q). The maximum breakdown voltage of 20 V corresponds to a temperature of 360 ° C. The highest permeability of 85% without breakthrough up to 360 ° C.

The drawings and the foregoing description give examples of embodiments. The person skilled in the art will understand that one or more of the elements described can certainly be combined into a single functional element. Alternatively, certain elements can be divided into several functional elements. Elements from one embodiment can be added to another embodiment. For example, the order of the processes described here can be changed and is not limited to the manner described here. In addition, the actions of a flowchart need not be performed in the order shown; nor do all the actions necessarily have to be carried out. The actions that are not dependent on other actions can also be carried out in parallel with the other actions. The scope of the embodiments is in no way limited by these specific examples. Numerous variations are possible, regardless of whether they are explicitly listed in the description or not, such as B. Differences in structure, dimensions and use of materials. The scope of the embodiments is at least as great as indicated in the following claims.

Advantages, other advantages, and solutions to problems have been described above with respect to certain embodiments. However, the advantages, benefits, solutions to problems and components that may result in an advantage, benefit or solution occurring or becoming more pronounced are not to be understood as a critical, required or essential feature or component of any or all claims.

List of reference symbols

100

System for the production of a transparent conductive film

102

Spin coater

104

PI substrate

106

oven

108

Contact electrode pair

110

Nano heater

Claims (9)

A system for producing a transparent conductive film, the system comprising: a spin coater configured to produce AgNWs and CuNPs on a PI substrate at 2500 rpm for 1 minute with AgNWs and CuNPs dispersed in IPA overnight; an oven for annealing the spin-coated substrate at 50 ° C. for 10 minutes to ensure the adhesion of the AgNW + CuNPs to the substrate; and a pair of silver paste contact electrodes applied to both vertical sides of the spin-coated PI substrate. System according to Claim 1 wherein the substrate is made of polyimide, polymethyl methacrylate, polycarbonate, etc. System according to Claim 1 , the samples with different ratios (AgNW: CuNPs) in wt .-% as A1 (1: 0), A2 (0.7: 0.3), A3 (0.5: 0.5) and A4 (0 , 3: 0.7). System according to Claim 1 , whereby the sample with AgNW and CoNPs in the ratio 0: 1 shows no electrical continuity and is discarded. System according to Claim 1 , wherein a transparent conductive nano heater is made of AgNW and CuNPs. The system after Claim 5 , with combined approach with an optimal ratio of AgNW-CuNPs, preferably 0.5: 0.5 in wt .-% for reaching the maximum Joule heating temperature of more than 300 ° C, preferably 360 ° C and sheet resistance less than (40 Ω / qm). System according to Claim 5 , with a maximum breakdown voltage of 20 V, which corresponds to a temperature of 360 ° C. System according to Claim 5 , with the highest permeability of 85% being achieved without a breakthrough up to 360 ° C. System according to Claim 1 cleaning the PI substrate using IPA and acetone in a container.

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