CN114287882A - Flexible hydrogel-based capacitive pressure sensor and preparation method thereof - Google Patents
Flexible hydrogel-based capacitive pressure sensor and preparation method thereof Download PDFInfo
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- CN114287882A CN114287882A CN202111518380.4A CN202111518380A CN114287882A CN 114287882 A CN114287882 A CN 114287882A CN 202111518380 A CN202111518380 A CN 202111518380A CN 114287882 A CN114287882 A CN 114287882A
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- 239000000017 hydrogel Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000758 substrate Substances 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 18
- 239000000243 solution Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- -1 1-n-butyl-3-methylimidazolium hexafluorophosphate Chemical compound 0.000 claims description 4
- QMYCJCOPYOPWTI-UHFFFAOYSA-N 2-[(1-amino-1-imino-2-methylpropan-2-yl)diazenyl]-2-methylpropanimidamide;hydron;chloride Chemical compound Cl.NC(=N)C(C)(C)N=NC(C)(C)C(N)=N QMYCJCOPYOPWTI-UHFFFAOYSA-N 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 229920002554 vinyl polymer Polymers 0.000 claims description 4
- 239000002608 ionic liquid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
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- 230000001070 adhesive effect Effects 0.000 claims description 2
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- 102000008186 Collagen Human genes 0.000 description 3
- 108010035532 Collagen Proteins 0.000 description 3
- 206010020772 Hypertension Diseases 0.000 description 3
- 229920001436 collagen Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 208000024172 Cardiovascular disease Diseases 0.000 description 1
- 208000017667 Chronic Disease Diseases 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
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Abstract
The invention relates to a flexible hydrogel-based capacitive pressure sensor and a preparation method thereof. The wearable pressure sensing detection system has the characteristics of high flexibility, low biotoxicity and good biocompatibility, and has the potential of realizing wearable pressure sensing detection.
Description
Technical Field
The invention relates to the technical field of capacitive pressure sensors, in particular to a flexible hydrogel-based capacitive pressure sensor and a preparation method thereof.
Background
Non-infectious chronic diseases such as hypertension, hyperglycemia, hyperlipidemia and the like seriously threaten the health of human beings. Among them, about 3 hundred million patients with hypertension in China have the symptoms of dizziness, tinnitus and palpitation, and serious cardiovascular and cerebrovascular diseases. Therefore, monitoring and control of blood pressure is particularly important. In recent years, the emergence of wearable intelligent medical devices has brought gospel to hypertensive patients, and at the same time, the wearable intelligent medical devices also provide a platform for flexible capacitive pressure sensors.
A capacitive pressure sensor is a device that converts an external pressure applied to the sensor into a change in capacitance. According to the classical capacitance formula C ═ epsilon·S/d it is known that the pressure exerted on the sensor causes the thickness of the dielectric layer to become smaller, i.e. the distance d between the parallel capacitive plates becomes smaller, resulting in an increase in capacitance. It can be easily understood that the larger the amount of deformation of the distance d, the larger the increment of the capacitance C, and thusThis highly flexible material has advantages in the fabrication of capacitive pressure sensors.
The collagen material is a wet soft material with a three-dimensional cross-linked network structure, has the advantages of air permeability, flexibility, low biotoxicity, good biocompatibility and the like, and plays an important role in the fields of biological medicine, food industry and environmental sanitation. The hydrogel is often used as a carrier of drugs or cells, a scaffold for tissue engineering, a substrate of a biosensor, and the like, so that it has potential for realizing wearable sensing detection.
Disclosure of Invention
The capacitive pressure sensor based on the flexible hydrogel is characterized by comprising a dielectric layer and a flexible conductive copper substrate connected with the dielectric layer, wherein the dielectric layer is made of the flexible hydrogel with low biotoxicity and good biocompatibility, the flexible conductive copper substrate can be connected with a lead of an external capacitance meter, and the preparation method comprises the following specific steps:
preparing hydrogel solution with certain concentration, and adding ionic liquid to be uniformly mixed with the hydrogel solution.
And pouring the mixed solution into a mold, adding a photoinitiator, and carrying out ultraviolet curing for a certain time to obtain a hydrogel solid.
And (3) attaching two flexible conductive copper substrates to two sides of the hydrogel solid to obtain the required capacitive pressure sensor.
The concentration of the hydrogel is 40-80%, and the preferable material is polyvinyl amide.
The ionic solution is 1-n-butyl-3-methylimidazolium hexafluorophosphate, and the mixing ratio of the ionic solution to the hydrogel is 1: 5-1: 20.
the size of the die is controllable, the length and the width of the die are 0.5-5 cm, and the height of the die is 0.5-5 cm.
The length of the cut ion activated collagen material is 0.3 cm-3 cm, and the width of the cut ion activated collagen material is 0.1 cm-1.5 cm.
The mass ratio of the photoinitiator to the hydrogel solution is as follows: 0.001: 1-0.04: 1, and the preferable material is 2,2' -azo-bis-isobutyramidine hydrochloride.
The wavelength of the ultraviolet light is 280-380 nm.
The ultraviolet curing time is 2-10 minutes.
The flexible conductive copper substrate is attached to the dielectric layer through an adhesive.
The two flexible conductive copper substrates are parallel to each other, the length of the opposite part is 1.0-10 cm, and the width is 0.3-5.0 cm.
Compared with the prior art, the invention has the beneficial effects that:
the invention combines the advantages of low biotoxicity, high biocompatibility, high flexibility and the like of hydrogel, provides the flexible capacitive pressure sensor, has the characteristics of good portability, high sensitivity and the like, and is expected to be applied to the field of wearable pressure sensors.
Drawings
FIG. 1 is a schematic diagram of the preparation of the hydrogel for dielectric layer according to the present invention;
fig. 2 is a sensing schematic diagram of the capacitive pressure sensor of the present invention.
Detailed Description
The invention is further described with reference to specific examples.
Example 1:
5mL of a 40% strength polyvinyl amide hydrogel solution was prepared, followed by addition of 1mL of a 1-n-butyl-3-methylimidazolium hexafluorophosphate solution and thorough mixing.
The mixed solution was poured into a mold having a size of 1cm x 1cm, followed by the addition of 10 μ L of 2,2' -azobisisobutyramidine hydrochloride.
After irradiating the above solution for 2 minutes using an ultraviolet lamp having a wavelength of 330nm, the hydrogel solid was taken out.
And (3) attaching two flexible conductive copper substrates to two sides of the hydrogel solid in parallel to ensure that the two flexible conductive copper substrates are opposite to each other, wherein the length of the two flexible conductive copper substrates is 1cm, and the width of the two flexible conductive copper substrates is 0.6mm, so that the flexible hydrogel capacitive pressure sensor is obtained.
Example 2:
5mL of a 60% strength polyvinyl amide hydrogel solution was prepared, followed by addition of 1mL of a 1-n-butyl-3-methylimidazolium hexafluorophosphate solution and thorough mixing.
The mixed solution was poured into a mold with a size of 0.8cm by 2cm, followed by addition of 20 μ L of 2,2' -azobisisobutyramidine hydrochloride.
And irradiating the solution for 5 minutes by using an ultraviolet lamp with the wavelength of 365nm, and taking out the hydrogel solid.
And (3) attaching two flexible conductive copper substrates to two sides of the hydrogel solid in parallel to ensure that the two flexible conductive copper substrates are opposite to each other, wherein the length of the two flexible conductive copper substrates is 0.8cm, and the width of the two flexible conductive copper substrates is 0.6cm, so that the flexible hydrogel capacitive pressure sensor is obtained.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. The capacitive pressure sensor based on the flexible hydrogel is characterized by comprising a dielectric layer and a flexible conductive copper substrate connected with the dielectric layer, wherein the dielectric layer is made of the flexible hydrogel with low biotoxicity and good biocompatibility, the flexible conductive copper substrate can be connected with a lead of an external capacitance meter, and the preparation method comprises the following specific steps:
s1: preparing a hydrogel solution with a certain concentration, adding ionic liquid, and uniformly mixing the ionic liquid and the hydrogel solution;
s2: pouring the mixed solution into a mold, adding a photoinitiator, and carrying out ultraviolet curing for a certain time to obtain a hydrogel solid;
s3: and (3) attaching two flexible conductive copper substrates to two sides of the hydrogel solid to obtain the required capacitive pressure sensor.
2. The flexible hydrogel based capacitive pressure sensor and the method for manufacturing the same according to claim 1, wherein the hydrogel has a concentration of 40% to 80%, and the preferred material is polyvinyl amide.
3. The flexible hydrogel-based capacitive pressure sensor and the method for manufacturing the same according to claim 1, wherein the ionic solution is 1-n-butyl-3-methylimidazolium hexafluorophosphate, and the mixing ratio of the ionic solution to the hydrogel is 1: 5-1: 20.
4. the flexible hydrogel based capacitive pressure sensor and the preparation method thereof according to claim 1, wherein the mold has a controllable size, a length and a width of 0.5-5 cm, and a height of 0.5-5 cm.
5. The flexible hydrogel based capacitive pressure sensor and the preparation method thereof according to claim 1, wherein the mass ratio of the photoinitiator to the hydrogel solution is: 0.001: 1-0.04: 1, and the preferable material is 2,2' -azo-bis-isobutyramidine hydrochloride.
6. The flexible hydrogel based capacitive pressure sensor and the preparation method thereof according to claim 1, wherein the wavelength of the ultraviolet light is 280-380 nm.
7. The flexible hydrogel based capacitive pressure sensor and the preparation method thereof according to claim 1, wherein the ultraviolet curing time is 2-10 minutes.
8. The flexible capacitive pressure sensor of claim 1, wherein the flexible conductive copper substrate is attached to the dielectric layer with an adhesive.
9. The flexible capacitive pressure sensor according to claim 1, wherein the two flexible conductive copper substrates are parallel to each other, and the facing portions have a length of 0.5 to 5cm and a width of 0.5 to 5 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111518380.4A CN114287882A (en) | 2021-12-13 | 2021-12-13 | Flexible hydrogel-based capacitive pressure sensor and preparation method thereof |
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| CN202111518380.4A CN114287882A (en) | 2021-12-13 | 2021-12-13 | Flexible hydrogel-based capacitive pressure sensor and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115615468A (en) * | 2022-10-14 | 2023-01-17 | 长春工业大学 | Ion-adjustable hydrogel-based bimodal capacitive sensor and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160025669A1 (en) * | 2013-04-10 | 2016-01-28 | President And Fellows Of Harvard College | Stretchable ionics for transparent sensors and actuators |
| CN106950000A (en) * | 2017-03-29 | 2017-07-14 | 深圳大学 | A kind of Pulse pressure sensor, chip, device, system and preparation method thereof |
| CN113188711A (en) * | 2021-04-29 | 2021-07-30 | 苏州凝智新材料发展有限公司 | Pressure sensor and preparation method and application thereof |
| CN113203504A (en) * | 2021-04-01 | 2021-08-03 | 上海交通大学 | Flexible wearable pressure sensor with ultrahigh capacitance and pressure sensor array |
-
2021
- 2021-12-13 CN CN202111518380.4A patent/CN114287882A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160025669A1 (en) * | 2013-04-10 | 2016-01-28 | President And Fellows Of Harvard College | Stretchable ionics for transparent sensors and actuators |
| CN106950000A (en) * | 2017-03-29 | 2017-07-14 | 深圳大学 | A kind of Pulse pressure sensor, chip, device, system and preparation method thereof |
| CN113203504A (en) * | 2021-04-01 | 2021-08-03 | 上海交通大学 | Flexible wearable pressure sensor with ultrahigh capacitance and pressure sensor array |
| CN113188711A (en) * | 2021-04-29 | 2021-07-30 | 苏州凝智新材料发展有限公司 | Pressure sensor and preparation method and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115615468A (en) * | 2022-10-14 | 2023-01-17 | 长春工业大学 | Ion-adjustable hydrogel-based bimodal capacitive sensor and application thereof |
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