CN112739187B - Application of polyvinyl alcohol ionic gel as flexible electronic electromagnetic shielding layer - Google Patents
Application of polyvinyl alcohol ionic gel as flexible electronic electromagnetic shielding layer Download PDFInfo
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- CN112739187B CN112739187B CN202011554084.5A CN202011554084A CN112739187B CN 112739187 B CN112739187 B CN 112739187B CN 202011554084 A CN202011554084 A CN 202011554084A CN 112739187 B CN112739187 B CN 112739187B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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Abstract
The invention belongs to the technical field of flexible electronics, and particularly relates to application of polyvinyl alcohol ionic gel as a flexible electronic electromagnetic shielding layer. The flexible electronic electromagnetic shielding layer is prepared by the following method: (1) dissolving polyvinyl alcohol particles in water, performing ultrasonic treatment, uniformly dispersing, adding electrolyte, and performing ultrasonic treatment again to form liquid ionic gel; (2) coating the liquid ionic gel on the surface of the flexible electronic device, and drying to form a flexible ionic gel film; (3) and grounding the flexible ionic gel film to obtain the flexible electronic electromagnetic shielding layer. The liquid ionic gel prepared by the invention has liquid fluidity, the ionic gel film after curing has high ductility, can completely match the complex appearance of the flexible electronic device and the deformation generated by the flexible electronic device, the ionic gel film is colorless and transparent, the observation of the flexible electronic device cannot be influenced, the process is easy to master, and the operation flow is simple.
Description
Technical Field
The invention belongs to the technical field of flexible electronics, and particularly relates to application of polyvinyl alcohol ionic gel as a flexible electronic electromagnetic shielding layer.
Background
The flexible electronics is good in flexibility and high in compatibility, and has wide application prospects in the fields of medical treatment, information, energy, national defense and the like, such as flexible sensing, flexible display, flexible energy storage, electronic skin, electronic tags, wearable equipment and the like. With the development of electronic devices towards flexibility and precision, the traditional electromagnetic shielding materials such as metals and their alloys cannot meet the requirements of flexible electronic devices for electromagnetic shielding due to lack of flexibility and difficulty in processing. Therefore, it is very important to develop a flexible electromagnetic shielding method with an easily mastered process and a flexible and changeable structure in the field of flexible electronics.
CN111636115A discloses a polyvinyl alcohol based fiber material for electromagnetic shielding and a preparation method thereof, wherein the method comprises the following steps: adding graphene into Mxene centrifugate, stirring, adding an acrylic monomer and an initiator, carrying out copolymerization reaction, adding polyvinyl alcohol into the obtained graphene/Mxene mixed dispersion liquid, and then carrying out wet spinning. According to the method, graphene and Mxene can be uniformly dispersed in a polymer matrix, the problem of poor spinnability is solved, the prepared fiber material has excellent electromagnetic shielding performance, electromagnetic shielding is achieved by taking the dispersed graphene as an electronic conductor, and electromagnetic shielding is achieved by taking transparent ionic gel as an ionic conductor.
Conventional solid shielding materials require cumbersome machining to match the profile of the shielded body. The polyvinyl alcohol liquid ionic gel has liquid fluidity and viscosity, and can be conveniently coated on the complex surface of the flexible electronic device without mechanical processing. The dried and cured ionic gel film has high ductility, can completely match the complex appearance of a flexible electronic device and the deformation generated by the flexible electronic device, and can fully match the requirements of electromagnetic shielding when used as an electromagnetic shielding layer in the field of flexible electronics. At the same time, the transparency of the ionic gel film provides convenience for viewing the shielded flexible electronic devices. However, the prior art still lacks of a polyvinyl alcohol ionic gel design and preparation method for flexible electronic electromagnetic shielding application.
Disclosure of Invention
Aiming at the improvement requirement of the prior art, the invention provides a method for coating liquid ionic gel on the surface of a flexible electronic device or a product with a complex shape, forming a flexible ionic gel film which is completely matched with the complex geometric shape and a deformation curved surface of the electronic device or the product after drying and curing, and grounding the ionic gel film as a shielding layer to realize electromagnetic shielding, thereby realizing the application of polyvinyl alcohol ionic gel as a flexible electronic electromagnetic shielding layer. The detailed technical method of the present invention is as follows.
The polyvinyl alcohol ionic gel is used as a flexible electronic electromagnetic shielding layer.
Preferably, the flexible electronic electromagnetic shielding layer is prepared by the following method:
(1) dissolving polyvinyl alcohol particles in water, dispersing uniformly after ultrasonic treatment, adding electrolyte, and performing ultrasonic treatment again to form liquid ionic gel;
(2) coating the liquid ionic gel on the surface of the flexible electronic device, and drying to form a flexible ionic gel film;
(3) and grounding the flexible ionic gel film to obtain the flexible electronic electromagnetic shielding layer.
Preferably, the electrolyte is phosphoric acid or sodium chloride.
Preferably, the mass ratio of the polyvinyl alcohol to the water is 1: 9, the mass ratio of the polyvinyl alcohol to the phosphoric acid is 1: (1.2-1.5), wherein the mass ratio of the polyvinyl alcohol to the sodium chloride is 1: (0.2-0.4).
Preferably, the ultrasonic frequency used in the preparation of the ionic gel is 20-40KHz, and the ultrasonic time is 30-50 min.
Preferably, the coating is to dip the flexible electronic device into liquid ionic gel and then take out the flexible electronic device.
Preferably, the coating is to coat the liquid ionic gel on the surface of the flexible electronic device by spraying or painting.
Preferably, the flexible electronics comprise one of a flexible capacitive sensor, a flexible electronic skin, a soft body robot, and a wearable electronic device.
The invention has the following beneficial effects:
(1) the liquid ionic gel prepared by the invention has liquid fluidity and viscosity, can be conveniently coated on the complex surface of a flexible electronic device, and does not need to be processed by complicated machinery to match the appearance of a shielded body. The cured ionic gel film has high ductility and can completely match the complex appearance of the flexible electronic device and the deformation generated by the complex appearance;
(2) the ionic gel film is colorless and transparent, and the observation of the flexible electronic device cannot be influenced;
(3) the process is easy to master and the operation flow is simple.
Drawings
FIG. 1 is a PVA/H capacitance of the flexible curvature sensor in example 13PO4Comparative figures before and after ion gel shielding.
FIG. 2 is a comparison of the capacitance of the flexible curvature sensor of example 2 before and after PVA/NaCl ionogel shielding.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
Example 1
(1) Preparation of ionic gel: firstly, 4g of polyvinyl alcohol particles are weighed and added into 36g of deionized water, the mixture is stirred moderately, after the polyvinyl alcohol particles are dispersed uniformly by ultrasonic treatment for 30min, 5.4g of phosphoric acid (85 wt% in H ≧ 85 wt%) is added2And O), finally carrying out ultrasonic treatment for 30min, and fully mixing to form liquid ionic gel, wherein the ultrasonic frequency is 20 KHz.
(2) The electromagnetic shielding implementation method comprises the following steps: and (3) immersing the flexible capacitive curvature sensor into the liquid ionic gel, taking out the flexible capacitive curvature sensor, and then putting the flexible capacitive curvature sensor into a drying oven for drying treatment for 8 hours to solidify the liquid ionic gel to form a film.
(3) And finally, taking the ionic gel film as a shielding layer and grounding by using a lead so as to realize electromagnetic shielding of the flexible sensor.
Example 2
(1) Preparation of ionic gel: firstly, weighing 2g of polyvinyl alcohol particles, adding the polyvinyl alcohol particles into 18g of deionized water, stirring the mixture appropriately, carrying out ultrasonic treatment for 30min to disperse the mixture uniformly, adding 0.22g of sodium chloride particles, and finally carrying out ultrasonic treatment for 30min to fully mix the mixture to form liquid ionic gel, wherein the ultrasonic frequency is 40 KHz.
(2) The electromagnetic shielding implementation method comprises the following steps: and (3) immersing the flexible capacitive curvature sensor into the liquid ionic gel, taking out the flexible capacitive curvature sensor, and then putting the flexible capacitive curvature sensor into a drying oven for drying treatment for 8 hours to solidify the liquid ionic gel to form a film.
(3) And finally, taking the ionic gel film as a shielding layer and grounding by using a lead so as to realize electromagnetic shielding of the flexible sensor.
Test examples
The invention
And (3) testing the electromagnetic shielding performance: sine wave voltage (20V 1Hz-1MHz) is generated by a function waveform generator and is applied to copper pole plates with the spacing of 20mm to generate an alternating electromagnetic field. The alternating electromagnetic field is used as electromagnetic interference and applied to the flexible capacitance type curvature sensor, and the electromagnetic shielding effect of the ionic gel on the flexible curvature sensor is verified by measuring the capacitance of the sensor. The measurement results of example 1 are shown in fig. 1, and the measurement results of example 2 are shown in fig. 2.
Results and discussion.
The alternating electromagnetic field, acting as electromagnetic interference, is applied to the flexible capacitive curvature sensor, affecting the capacitance reading of the capacitive curvature sensor. As can be seen by comparing the fluctuation of the sensor capacitance before and after the ion gel shielding, in example 1, the ion gel can completely shield electromagnetic interference at a frequency of 1Hz to 50kHz, and the ion gel can partially shield the electromagnetic interference at a frequency of 1MHz, so that the electromagnetic interference still exists, but the interference amplitude is greatly reduced; in example 2, the ionic gel can completely shield electromagnetic interference at the frequency of 1Hz to 10kHz, and can partially shield the electromagnetic interference at the frequency of 50kHz to 1MHz, and the electromagnetic interference still exists, but the interference amplitude is greatly reduced.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. Polyvinyl alcohol/H3PO4Use of an ionic gel as a flexible electronic electromagnetic shielding layer for shielding electromagnetic waves, the flexible electronic electromagnetic shielding layer being prepared by a method comprising:
(1) dissolving polyvinyl alcohol particles in water, performing ultrasonic treatment, uniformly dispersing, adding electrolyte, and performing ultrasonic treatment again to form liquid ionic gel;
(2) coating the liquid ionic gel on the surface of the flexible electronic device, and drying to form a flexible ionic gel film;
(3) grounding the flexible ionic gel film to obtain a flexible electronic electromagnetic shielding layer;
the electrolyte is phosphoric acid, and the corresponding obtained ionic gel is polyvinyl alcohol/H3PO4An ionic gel;
the polyvinyl alcohol/H3PO4The ionic gel can completely shield 1Hz-50kHz electromagnetic waves.
2. Polyvinyl alcohol/H according to claim 13PO4The application of the ionic gel as a flexible electronic electromagnetic shielding layer in shielding electromagnetic waves is characterized in that the mass ratio of the polyvinyl alcohol to the water is 1: 9, the mass ratio of the polyvinyl alcohol to the phosphoric acid is 1: (1.2-1.5).
3. Polyvinyl alcohol/H according to claim 13PO4The application of the ionic gel as a flexible electronic electromagnetic shielding layer in shielding electromagnetic waves is characterized in that the ultrasonic frequency used in the preparation of the ionic gel is 20-40KHz, and the ultrasonic time is 30-50 min.
4. Polyvinyl alcohol/H according to claim 13PO4The application of the ionic gel as a flexible electronic electromagnetic shielding layer in shielding electromagnetic waves is characterized in that the coating is to immerse the flexible electronic device into the liquid ionic gel and then take out the flexible electronic device.
5. Polyvinyl alcohol/H according to claim 13PO4The application of the ionic gel as a flexible electronic electromagnetic shielding layer in shielding electromagnetic waves is characterized in that the coating is to coat the liquid ionic gel on the surface of a flexible electronic device by spraying or smearing.
6. Polyvinyl alcohol/H according to claim 13PO4Ion gel made ofUse of a flexible electronic electromagnetic shielding layer for shielding electromagnetic waves, wherein the flexible electronic device comprises one of a flexible capacitive sensor, a flexible electronic skin, a soft body robot and a wearable electronic device.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1738523A (en) * | 2004-08-02 | 2006-02-22 | 索尼株式会社 | Electromagnetism suppressing material, electromagnetism suppressing device, and electronic appliance |
| CN101683019A (en) * | 2007-03-22 | 2010-03-24 | 3M创新有限公司 | Electromagnetic wave shielding material and sheet |
| CN107622875A (en) * | 2017-09-04 | 2018-01-23 | 吉林大学 | A kind of preparation method of the wearable device of the self-powered of electromagnetic shielding |
| CN110582812A (en) * | 2017-03-07 | 2019-12-17 | 哈佛学院院长及董事 | Stretchable electro-optic and mechanical-optic devices |
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2020
- 2020-12-24 CN CN202011554084.5A patent/CN112739187B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1738523A (en) * | 2004-08-02 | 2006-02-22 | 索尼株式会社 | Electromagnetism suppressing material, electromagnetism suppressing device, and electronic appliance |
| CN101683019A (en) * | 2007-03-22 | 2010-03-24 | 3M创新有限公司 | Electromagnetic wave shielding material and sheet |
| CN110582812A (en) * | 2017-03-07 | 2019-12-17 | 哈佛学院院长及董事 | Stretchable electro-optic and mechanical-optic devices |
| CN107622875A (en) * | 2017-09-04 | 2018-01-23 | 吉林大学 | A kind of preparation method of the wearable device of the self-powered of electromagnetic shielding |
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