CN112754489A - Graphene-based dry electrode and preparation method thereof - Google Patents
Graphene-based dry electrode and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of graphene electrodes, in particular to a graphene-based dry electrode and a preparation method thereof. Including graphite alkene layer, flexible substrate and electrode buckle, the bottom of flexible substrate is equipped with graphite alkene layer, the electrode buckle is inlayed in the flexible substrate, the electrode buckle with graphite alkene layer contacts. The dry electrode prepared by the invention has good conductivity, is not easy to generate polarization and has long service life. The dry electrode based on the graphene prepared by the invention adopts a flexible substrate material, and the graphene and the electrode buckle are embedded in the flexible material, so that the dry electrode is not easy to fall off and is convenient to connect with an electrocardiogram detection device. The preparation method of the graphene-based dry electrode provided by the invention does not need complex processes and expensive equipment, is low in manufacturing cost and is convenient for large-scale production.
Description
Technical Field
The invention relates to the technical field of graphene electrodes, in particular to a graphene-based dry electrode and a preparation method thereof.
Background
Currently, electrocardiographic detection can provide a lot of useful information, which is beneficial to early diagnosis of cardiovascular and cerebrovascular diseases. At present, the wet electrode is commonly used in medicine for collecting electrocardiosignals. The wet electrode reduces the contact impedance with the skin by the electrolytic gel, so that the measured electrocardiosignal quality is good, but the electrolytic gel stimulates the skin, and the signal quality is reduced along with the drying of the gel, so that the wet electrode cannot be used for long-term monitoring. Therefore, the dry electrode becomes a better choice for long-term monitoring of electrocardiosignals. Because the skin preparation and the coating of the conductive paste are not needed, the dry electrode is very suitable for the requirements of future health monitoring, disease diagnosis and treatment, brain-computer interfaces and human-computer interaction systems. Among them, the flexible dry electrode is more and more favored in wearable medical devices because it is soft and does not irritate the skin, and can be used for a long time.
The graphene has excellent physical properties, and has a length of more than 15000cm at room temperature2V-1s-1The mobility of the carriers is not affected by temperature basically and can reach 200000cm at most2V-1s-1With a corresponding resistivity of 10-6Omega cm, the graphene is the material with the lowest room-temperature resistivity in the existing known substances.
The Chinese patent with the application number of 201510168806.6 provides an electrocardioelectrode and a preparation method thereof, wherein the method comprises the steps of forming a graphene nanowall on a metal sheet by a chemical vapor deposition method, and transferring the graphene nanowall onto a flexible substrate to obtain the graphene nanowall flexible electrocardioelectrode. The electrode prepared by the method has low impedance and good conductivity, but the deposition process in the preparation needs expensive equipment, has high cost and is not beneficial to large-scale production.
The flexible dry electrode mostly uses a polymer material as a substrate, and the polymer surface is conductive by adopting a metal coating mode, so that the electrode prepared by the mode has good conductivity, but metal is adhered to the polymer surface and is easy to fall off, and the service life of the electrode is short. And the other method is to fill conductive materials in the polymer to prepare the polymer electrode, and the method is simple and easy to operate, but the conductivity is often poorer than that of a metal electrode, so that the signal quality is influenced.
In order to solve the problems, a flexible dry electrode with good conductivity, simple preparation method and low cost is needed.
Disclosure of Invention
The first purpose of the invention is to provide a graphene-based dry electrode which has good conductivity, is not easy to generate polarization, has long service life, is embedded in a flexible substrate in a buckling manner, is not easy to fall off, and is convenient to connect with a measurement system. The second purpose of the invention is to provide a preparation method of the graphene-based dry electrode.
The invention provides a graphene-based dry electrode which comprises a graphene layer, a flexible substrate and an electrode buckle, wherein the graphene layer is arranged at the bottom of the flexible substrate, the electrode buckle is embedded in the flexible substrate, and the electrode buckle is in contact with the graphene layer.
Preferably, the flexible substrate is a polydimethylsiloxane substrate.
Preferably, the thickness of the graphene layer is 20-70 μm
Preferably, the electrode buckle is provided with an electrode contact.
The invention provides a preparation method of a graphene-based dry electrode, which comprises the following steps:
(1) mixing graphene powder with a solvent, and carrying out ultrasonic treatment to prepare a graphene suspension;
(2) dripping the graphene suspension onto a microporous filter membrane to obtain the microporous filter membrane with graphene;
(3) pasting a double-sided adhesive tape on a glass substrate, and pasting a microporous filter membrane with graphene on the double-sided adhesive tape;
(4) placing an electrode buckle on the surface of the graphene obtained in the step (3), and pressing the electrode buckle to enable the electrode buckle to be in contact with the graphene;
(5) and (4) pouring a substrate liquid onto the surface of the graphene and the surface of the electrode buckle in the step (4), heating and drying, solidifying the substrate liquid to obtain the flexible substrate, and stripping the microporous filter membrane from the graphene to obtain the graphene-based dry electrode.
Preferably, the solvent in step (1) is an alcohol volatile solvent; ethanol is more preferred.
Preferably, the particle size of graphene in the graphene suspension in the step (1) is 0.5-3 μm.
Preferably, the pore size of the microporous filter membrane in the step (2) is 0.22-1.2 μm.
Preferably, the substrate solution in step (5) is SYLGARD 184SILICONE ELASTOMER; SYLGARD 184SILICONE ELASTOMER is a commercially available product and comprises a polydimethylsiloxane prepolymer and a curing agent, and the polydimethylsiloxane prepolymer and the curing agent are mixed according to a mass ratio of 10:1 when in use.
Preferably, the heating temperature in the step (5) is 60-65 ℃ and the heating time is 25-30 minutes.
In summary, the invention has the following advantages:
(1) the dry electrode prepared by the invention has good conductivity, is not easy to generate polarization and has long service life.
(2) The dry electrode based on the graphene prepared by the invention adopts a flexible substrate material, and the graphene and the electrode buckle are embedded in the flexible material, so that the dry electrode is not easy to fall off and is convenient to connect with an electrocardiogram detection device.
(3) The preparation method for preparing the graphene-based dry electrode provided by the invention does not need complex processes and expensive equipment, is low in manufacturing cost and is convenient for large-scale production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a diagram illustrating a process for preparing a dry electrode according to an embodiment of the present invention;
FIG. 2 is a structural view of the appearance of a dry electrode prepared in an example of the present invention;
FIG. 3 is a view of the appearance of the bracelet according to the embodiment of the invention;
fig. 4 is a front view of a bracelet in an embodiment of the invention.
Description of reference numerals: 1-graphene layer, 2-microporous filter membrane, 3-double faced adhesive tape, 4-glass sheet, 5-flexible substrate, 6-electrode buckle, 7-electrode contact and 8-magic tape buckle.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The utility model provides a dry electrode based on graphite alkene, as shown in fig. 2, includes that graphite alkene layer 1, flexible substrate 5 and electrode buckle 6, and the bottom of flexible substrate 5 is equipped with graphite alkene layer 1, and electrode buckle 6 inlays in flexible substrate 5, and electrode buckle 6 contacts with graphite alkene layer 1, is equipped with electrode contact 7 on the electrode buckle 6, and graphite alkene layer 1's thickness is 30 mu m.
The bottom of flexible substrate 5 establishes graphite alkene layer 1, and graphite alkene layer 1 combines together with flexible substrate 5 through the mode of infiltration, and the top of flexible substrate 5 is equipped with electrode buckle 6, and electrode buckle 6 inlays and bonds together with graphite alkene layer 1 in flexible substrate 5. A magic tape 8 with the length of 18cm and the width of 4cm is taken, a round hole with the diameter equal to that of an electrode contact 7 is formed in the magic tape 8, the electrode contact 7 of the electrode button 6 penetrates through the round hole to be connected with the magic tape 8, and a wearable bracelet is formed.
This embodiment is when using, with the bracelet area on the wrist, passes the round hole with the electrode contact and pastes the area with the magic and detain and be connected, graphite alkene layer and human contact, electrode contact and electrocardio check out test set are connected, alright with monitor the heart.
A method for preparing a graphene-based dry electrode, as shown in fig. 1, comprises the following steps:
(1) mixing graphene powder with an ethanol solvent, putting the mixture into an ultrasonic machine, and carrying out ultrasonic treatment for 30 minutes to prepare a graphene suspension, wherein the particle size of graphene in the graphene suspension is 3 microns;
(2) sucking the graphene suspension by using a dropper, dropping the graphene suspension on a microporous filter membrane 2 with the diameter of 20mm and the pore diameter of 0.22 mu m, sucking an ethanol solvent of the graphene suspension by using filter paper, continuing sucking the graphene suspension by using the dropper after the graphene suspension is sucked, continuing dropping the graphene suspension on the microporous filter membrane 2, sucking the ethanol solvent of the graphene suspension by using the filter paper, repeating the operation for 5 times until the microporous filter membrane 2 is fully paved with graphene, and retaining the graphene on the microporous filter membrane 2 by the mode to obtain the microporous filter membrane 2 with the graphene, wherein the thickness of a graphene layer 1 is 30 mu m;
(3) adhering a double-sided adhesive tape 3 on a glass sheet 4, adhering the microporous filter membrane 2 adsorbed with graphene on the double-sided adhesive tape 3, and placing the graphene layer 1 upwards;
(4) placing the electrode buckle 6 on the surface of the graphene layer 1, and pressing the electrode buckle 6 to enable the electrode buckle 6 to be in contact with the graphene layer 1;
(5) the substrate liquid is a commercial product SYLGARD 184SILICONE ELASTOMER, and SYLGARD 184SILICONE ELASTOMER comprises a polydimethylsiloxane prepolymer and a curing agent, the polydimethylsiloxane prepolymer and the curing agent are mixed according to the weight ratio of 10:1, the mixture is stirred uniformly, bubbles are removed by vacuumizing to obtain the substrate liquid, and then the substrate liquid is poured on the graphene layer 1 and the electrode buckle 6 to enable the substrate liquid to uniformly cover the graphene layer 1; and then heating the whole structure at 60 ℃ for 30min, drying the microporous filter membrane 2, solidifying the substrate liquid to obtain a flexible substrate 5, and then stripping the microporous filter membrane 2 from the graphene layer 1 to obtain the graphene-based dry electrode.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a dry electrode based on graphite alkene, its characterized in that includes graphite alkene layer, flexible substrate and electrode buckle, the bottom of flexible substrate is equipped with graphite alkene layer, electrode buckle inlays in the flexible substrate, electrode buckle with graphite alkene layer contacts.
2. The graphene-based dry electrode of claim 1, wherein: the flexible substrate is a polydimethylsiloxane substrate.
3. The graphene-based dry electrode of claim 1, wherein: the thickness of the graphene layer is 20-70 μm.
4. The graphene-based dry electrode of claim 1, wherein: the electrode buckle is provided with an electrode contact.
5. A method of preparing a graphene-based dry electrode according to any one of claims 1 to 4, comprising the steps of:
(1) mixing graphene powder with a solvent, and carrying out ultrasonic treatment to prepare a graphene suspension;
(2) dripping the graphene suspension onto a microporous filter membrane to obtain the microporous filter membrane with graphene;
(3) pasting a double-sided adhesive tape on a glass substrate, and pasting a microporous filter membrane with graphene on the double-sided adhesive tape;
(4) placing an electrode buckle on the surface of the graphene obtained in the step (3), and pressing the electrode buckle to enable the electrode buckle to be in contact with the graphene;
(5) and (4) pouring a substrate liquid onto the surface of the graphene and the surface of the electrode buckle in the step (4), heating and drying, solidifying the substrate liquid to obtain the flexible substrate, and stripping the microporous filter membrane from the graphene to obtain the graphene-based dry electrode.
6. The method of claim 5, wherein the graphene-based dry electrode comprises: the solvent in the step (1) is an alcohol volatile solvent.
7. The method of claim 5, wherein the graphene-based dry electrode comprises: the particle size of graphene in the graphene suspension in the step (1) is 0.5-3 μm.
8. The method of claim 5, wherein the graphene-based dry electrode comprises: the aperture of the microporous filter membrane in the step (2) is 0.22-1.2 μm.
9. The method of claim 5, wherein the graphene-based dry electrode comprises: and (5) adopting SYLGARD 184SILICONE ELASTOMER as the substrate liquid.
10. The method of claim 5, wherein the graphene-based dry electrode comprises: in the step (5), the heating temperature is 60-65 ℃, and the heating time is 25-30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110142788.XA CN112754489A (en) | 2021-02-02 | 2021-02-02 | Graphene-based dry electrode and preparation method thereof |
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| CN202110142788.XA CN112754489A (en) | 2021-02-02 | 2021-02-02 | Graphene-based dry electrode and preparation method thereof |
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| CN112754489A true CN112754489A (en) | 2021-05-07 |
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