CN111976070A - Invisible anti-counterfeiting stamp and preparation method thereof - Google Patents
Invisible anti-counterfeiting stamp and preparation method thereof Download PDFInfo
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- CN111976070A CN111976070A CN202010668204.8A CN202010668204A CN111976070A CN 111976070 A CN111976070 A CN 111976070A CN 202010668204 A CN202010668204 A CN 202010668204A CN 111976070 A CN111976070 A CN 111976070A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
The invention discloses an invisible anti-counterfeiting seal and a preparation method thereof, wherein the preparation method comprises the following steps: uniformly mixing polydimethylsiloxane and a curing agent, defoaming, taking out and flatly laying on a glass plate after bubbles completely disappear, defoaming for the second time, and pouring into a mold for curing and molding to obtain a patch; cleaning and drying the patch, carrying out oxygen plasma treatment, soaking, washing and drying; printing a mask on the surface of the polydimethylsiloxane, performing laser etching, placing in a nitrogen atmosphere, introducing mixed gas, heating, cooling, taking out the seal, and cleaning to obtain the invisible anti-counterfeiting seal. The invention also comprises the invisible anti-counterfeiting seal manufactured by the method. The seal of the invention mainly realizes transfer printing through hydrophilic/hydrophobic intervals on the surface, and the surface of the seal is a whole smooth and uniform plane, so that the seal cannot be imitated through photos, thereby achieving the anti-counterfeiting effect.
Description
Technical Field
The invention relates to the technical field of seal preparation, in particular to an invisible anti-counterfeiting seal and a preparation method thereof.
Background
In China, the seal is a tool frequently used in work and life of people, and the seal is used in work development, operation or operation of governments or enterprises. The seal has legal effectiveness and is an important certificate for individuals, enterprises or governments, so that lawbreakers often make false seals for profit making, which also causes very serious social impact and economic loss. Therefore, it is very important to realize the anti-counterfeiting of the seal.
At present, the anti-counterfeiting strategy of the seal mainly comprises three aspects: (1) the first digit of the number is a uniform serial number of a seal management unit, and the last digits are serial numbers of seal engraving companies, so that the number has uniqueness and queryability; (2) the anti-counterfeiting font is a professional anti-counterfeiting font and is difficult to copy; (3) the anti-counterfeiting line of the seal, namely on the edge of the seal or the font, has some unregulated white gaps on the graph, thereby causing certain difficulty to the anti-counterfeiting.
However, the above conventional anti-counterfeiting methods can only achieve a certain degree of stamp anti-counterfeiting. With the availability of high resolution photographs of the stamp surface, there is still a high probability that the stamp can be counterfeited. Therefore, an anti-counterfeiting method of embedding a chip into a stamp has been developed, but even the chip may be copied or separated from the stamp. In order to solve the problem, an invisible seal, namely an invisible anti-counterfeiting seal, needs to be invented.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the invisible anti-counterfeiting seal and the preparation method thereof, the invisible anti-counterfeiting seal realizes transfer printing mainly through hydrophilic/hydrophobic intervals on the surface, the surface of the seal is a whole smooth and uniform plane, and the imitation of the seal cannot be realized through photos, so that the anti-counterfeiting effect is achieved, the preparation method of the seal has simple flow and short required time, and the problems that the seal is easy to forge and the like are effectively solved.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the preparation method of the invisible anti-counterfeiting seal comprises the following steps in sequence:
(1) preparing a patch: uniformly mixing polydimethylsiloxane and a curing agent according to the mass ratio of 2-10: 1, then placing the mixture into a vacuum drying oven for deaeration for 1-2 hours, taking out the mixture after bubbles completely disappear, spreading the mixture on a glass plate, deaerating for 20-40 minutes for the second time, pouring the mixture into a mold, and curing and molding the mixture at the temperature of 60-75 ℃ for 2-4 hours to obtain a patch;
(2) oxygen plasma treatment: cleaning and drying the patch obtained in the step (1), then treating the patch for 30-60 s by using oxygen plasma, then soaking the patch in 0.4-0.6 wt% of lauryl sodium sulfate solution for 20-40 s, and finally washing and drying the patch in sequence to obtain the surface of polydimethylsiloxane; wherein, the radio frequency power is 120-140W during the oxygen plasma treatment, and the oxygen flow is 150-160 sccm;
(3) grafting hydrophobic molecules: 3D printing a mask on the surface of the polydimethylsiloxane obtained in the step (2) by using a water-soluble polymer, then placing the mask in a nitrogen atmosphere, introducing mixed gas, heating at 60-80 ℃ for 60-120 min, cooling to room temperature, taking out the seal, and finally cleaning for 2-4 times by using deionized water to obtain an invisible anti-counterfeiting seal; wherein the mixed gas is prepared by the following method: heating hydrophobic molecules to be in a gaseous state, and then mixing the hydrophobic molecules with nitrogen according to the volume ratio of 1:1 to obtain mixed gas.
Further, the viscosity of the polydimethylsiloxane is 10-2000 mPa.s.
Further, the curing agent is Dow Corning 184 curing agent, ethyl orthosilicate or dibutyltin dilaurate.
Further, in the step (2), the patch is subjected to ultrasonic cleaning for 1-2 times by deionized water, acetone and absolute ethyl alcohol in sequence, and then is dried by compressed air.
And (3) further, in the step (2), finally, washing with deionized water for 20-40 s, and drying with nitrogen.
Further, the flow rate of the mixed gas is 0.1-0.2L/min.
Further, the hydrophobic molecule is trimethoxy (1H,1H,2H, 2H-heptadecafluorodecyl) silane, trimethoxy (1H,1H,2H, 2H-nonafluorohexyl) silane, or trimethoxy (1H,1H,2H, 2H-tridecafluoro-n-octyl) silane.
Further, the water-soluble polymer is polyethyleneimine, polyacrylamide or methoxy-terminated polyethylene glycol.
The invisible anti-counterfeiting seal is prepared by the preparation method of the invisible anti-counterfeiting seal.
In summary, the invention has the following advantages:
1. the invisible anti-counterfeiting stamp is mainly transferred by hydrophilic/hydrophobic intervals on the surface, the surface of the stamp is a whole smooth and uniform plane, and the stamp cannot be imitated by a photo, so that the anti-counterfeiting effect is achieved.
2. During preparation, polydimethylsiloxane is used as a raw material, and is formed by crosslinking with a curing agent to prepare a stamp surface patch, wherein different mass ratios of polydimethylsiloxane to the curing agent and different hardness of the obtained patches can be used for preparing stamps with different handfeel; and then, carrying out oxygen plasma treatment on the patch to ensure that the whole patch becomes super-hydrophilic and the surface contains a large amount of-OH, so that the polydimethylsiloxane surface achieves good hydrophilicity and does not generate cracks. When the seal is prepared, the traditional carving process is not adopted. Firstly, a mask matched with the surface of a stamp patch is attached to the surface of a stamp, and then redundant parts of the mask are etched in a laser etching mode to finish lettering; then the stamp patch pasted with the mask is placed in a reaction cavity, hydrophobic molecules (such as trimethoxy (1H,1H,2H, 2H-heptadecafluorodecyl) silane) are grafted on the surface of the stamp patch by a Chemical Vapor Deposition (CVD) method, and then the mask is removed to finish the preparation of the stamp. The preparation process flow is simple and easy to control, the invisible anti-counterfeiting seal can be quickly prepared, and the preparation efficiency of the seal is improved.
3. The purpose of selecting the water-soluble polymer when the mask is printed is two, firstly, after the oxygen plasma treatment, the surface of the material is hydrophilic, and the water-soluble polymer has better compatibility with the surface and stronger adhesiveness; and secondly, in the process of removing the mask in the last step, the mask can be directly removed through water washing, so that the mask is convenient to remove. The invention realizes the smooth and invisible surface by utilizing the hydrophilic and hydrophobic functions of the material, and the material can complete the transfer printing of specific patterns after contacting ink or stamp-pad ink, thereby realizing the invisible and anti-counterfeiting of the seal and being difficult to imitate and forge.
Drawings
FIG. 1 is a schematic view of a process for preparing an invisible anti-counterfeiting stamp.
Detailed Description
Example 1
A preparation method of an invisible anti-counterfeiting stamp sequentially comprises the following steps:
(1) preparing a patch: uniformly mixing polydimethylsiloxane and Dow Corning 184 curing agent according to the mass ratio of 2:1, then placing the mixture into a vacuum drying oven for deaeration for 1h, taking out the mixture after bubbles completely disappear, flatly laying the mixture on a glass plate, deaerating for 20min for the second time, pouring the mixture into a mold, and curing and molding the mixture for 2h at the temperature of 60 ℃ to obtain a patch;
(2) oxygen plasma treatment: ultrasonically cleaning the patch obtained in the step (1) for 2 times by deionized water, acetone and absolute ethyl alcohol in sequence, drying by compressed air, then treating by oxygen plasma for 30s, then soaking in 0.5 wt% of lauryl sodium sulfate solution for 20s, finally washing by the deionized water for 20s, and drying by nitrogen to obtain the surface of polydimethylsiloxane; wherein, the radio frequency power is 120W during the oxygen plasma treatment, and the oxygen flow is 150 sccm;
(3) grafting hydrophobic molecules: 3D printing a mask on the surface of the polydimethylsiloxane obtained in the step (2) by adopting polyethyleneimine, then placing the mask in a nitrogen atmosphere, introducing mixed gas, heating at 60 ℃ for 120min, cooling to room temperature, taking out the seal, and finally cleaning for 3 times by using deionized water to obtain an invisible anti-counterfeiting seal; wherein the mixed gas is prepared by the following method: heating trimethoxy (1H,1H,2H, 2H-heptadecafluorodecyl) silane to a gaseous state, and mixing with nitrogen according to a volume ratio of 1:1 to obtain a mixed gas; the flow rate of the mixed gas was 0.1L/min.
Example 2
A preparation method of an invisible anti-counterfeiting stamp sequentially comprises the following steps:
(1) preparing a patch: uniformly mixing polydimethylsiloxane and Dow Corning 184 curing agent according to the mass ratio of 4:1, then placing the mixture into a vacuum drying oven for deaeration for 2 hours, taking out the mixture after bubbles completely disappear, spreading the mixture on a glass plate, deaerating for 20-40 minutes for the second time, pouring the mixture into a mold, and curing and molding the mixture for 3 hours at the temperature of 70 ℃ to obtain a patch;
(2) oxygen plasma treatment: ultrasonically cleaning the patch obtained in the step (1) for 2 times by deionized water, acetone and absolute ethyl alcohol in sequence, drying by compressed air, then treating by oxygen plasma for 40s, then soaking in 0.5 wt% of lauryl sodium sulfate solution for 30s, finally washing by deionized water for 30s, and drying by nitrogen to obtain the surface of polydimethylsiloxane; wherein, the radio frequency power is 130W during the oxygen plasma treatment, and the oxygen flow is 155 sccm;
(3) grafting hydrophobic molecules: adopting methoxy-terminated polyethylene glycol to print a mask on the surface of polydimethylsiloxane in a 3D mode, then placing the mask in a nitrogen atmosphere, introducing mixed gas, heating the mask for 100min at 70 ℃, taking out the seal after cooling to room temperature, and finally cleaning the seal for 3 times by using deionized water to obtain an invisible anti-counterfeiting seal; wherein the mixed gas is prepared by the following method: heating trimethoxy (1H,1H,2H, 2H-nonafluorohexyl) silane to be in a gaseous state, and then mixing the gaseous state with nitrogen according to the volume ratio of 1:1 to obtain mixed gas; the flow rate of the mixed gas was 0.2L/min.
Example 3
A preparation method of an invisible anti-counterfeiting stamp sequentially comprises the following steps:
(1) preparing a patch: uniformly mixing polydimethylsiloxane and Dow Corning 184 curing agent according to the mass ratio of 6:1, then placing the mixture into a vacuum drying oven for deaeration for 2 hours, taking out the mixture after bubbles completely disappear, flatly laying the mixture on a glass plate, deaerating for 30 minutes for the second time, pouring the mixture into a mold, and curing and molding the mixture for 3 hours at the temperature of 70 ℃ to obtain a patch;
(2) oxygen plasma treatment: ultrasonically cleaning the patch obtained in the step (1) for 2 times by deionized water, acetone and absolute ethyl alcohol in sequence, drying by compressed air, then treating by oxygen plasma for 40s, then soaking in 0.5 wt% of lauryl sodium sulfate solution for 30s, finally washing by deionized water for 30s, and drying by nitrogen to obtain the surface of polydimethylsiloxane; wherein, the radio frequency power is 130W during the oxygen plasma treatment, and the oxygen flow is 155 sccm;
(3) grafting hydrophobic molecules: 3D printing a mask on the surface of the polydimethylsiloxane obtained in the step (2) by adopting polyethyleneimine, then placing the mask in a nitrogen atmosphere, introducing mixed gas, heating at 80 ℃ for 80min, cooling to room temperature, taking out the seal, and finally cleaning for 3 times by using deionized water to obtain an invisible anti-counterfeiting seal; wherein the mixed gas is prepared by the following method: heating trimethoxy (1H,1H,2H, 2H-tridecafluoro n-octyl) silane to a gaseous state, and mixing the gaseous state with nitrogen according to the volume ratio of 1:1 to obtain a mixed gas; the flow rate of the mixed gas was 0.1L/min.
Example 4
A preparation method of an invisible anti-counterfeiting stamp sequentially comprises the following steps:
(1) preparing a patch: uniformly mixing polydimethylsiloxane and Dow Corning 184 curing agent according to the mass ratio of 8:1, then placing the mixture into a vacuum drying oven for deaeration for 2 hours, taking out the mixture after bubbles completely disappear, flatly laying the mixture on a glass plate, deaerating for 30 minutes for the second time, pouring the mixture into a mold, and curing and molding the mixture for 3 hours at the temperature of 75 ℃ to obtain a patch;
(2) oxygen plasma treatment: ultrasonically cleaning the patch obtained in the step (1) for 1 time by deionized water, acetone and absolute ethyl alcohol in sequence, drying by compressed air, then treating by oxygen plasma for 50s, then soaking in 0.5 wt% of lauryl sodium sulfate solution for 30s, finally washing by deionized water for 30s, and drying by nitrogen to obtain the surface of polydimethylsiloxane; wherein, the radio frequency power is 130W during the oxygen plasma treatment, and the oxygen flow is 158 sccm;
(3) grafting hydrophobic molecules: 3D printing a mask on the surface of the polydimethylsiloxane obtained in the step (2) by adopting methoxy-terminated polyethylene glycol, then placing the mask in a nitrogen atmosphere, introducing mixed gas, heating at 80 ℃ for 60min, cooling to room temperature, taking out the seal, and finally cleaning for 3 times by using deionized water to obtain an invisible anti-counterfeiting seal; wherein the mixed gas is prepared by the following method: heating trimethoxy (1H,1H,2H, 2H-heptadecafluorodecyl) silane to a gaseous state, and mixing with nitrogen according to a volume ratio of 1:1 to obtain a mixed gas; the flow rate of the mixed gas was 0.2L/min.
Example 5
A preparation method of an invisible anti-counterfeiting stamp sequentially comprises the following steps:
(1) preparing a patch: uniformly mixing polydimethylsiloxane and Dow Corning 184 curing agent according to the mass ratio of 10:1, then placing the mixture into a vacuum drying oven for deaeration for 2 hours, taking out the mixture after bubbles completely disappear, flatly laying the mixture on a glass plate, deaerating for 40 minutes for the second time, pouring the mixture into a mold, and curing and molding the mixture for 4 hours at the temperature of 75 ℃ to obtain a patch;
(2) oxygen plasma treatment: ultrasonically cleaning the patch obtained in the step (1) for 2 times by deionized water, acetone and absolute ethyl alcohol in sequence, drying by compressed air, then treating by oxygen plasma for 60s, then soaking in 0.6 wt% of lauryl sodium sulfate solution for 40s, finally washing by deionized water for 40s, and drying by nitrogen to obtain the surface of polydimethylsiloxane; wherein, the radio frequency power is 140W and the oxygen flow is 160sccm during the oxygen plasma treatment;
(3) grafting hydrophobic molecules: 3D printing a mask on the surface of the polydimethylsiloxane obtained in the step (2) by adopting polyacrylamide, then placing the mask in a nitrogen atmosphere, introducing mixed gas, heating for 80min at 80 ℃, taking out the seal after cooling to room temperature, and finally cleaning for 4 times by using deionized water to obtain the invisible anti-counterfeiting seal; wherein the mixed gas is prepared by the following method: heating trimethoxy (1H,1H,2H, 2H-nonafluorohexyl) silane to be in a gaseous state, and then mixing the gaseous state with nitrogen according to the volume ratio of 1:1 to obtain mixed gas; the flow rate of the mixed gas was 0.2L/min.
While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (9)
1. The preparation method of the invisible anti-counterfeiting seal is characterized by sequentially comprising the following steps of:
(1) preparing a patch: uniformly mixing polydimethylsiloxane and a curing agent according to the mass ratio of 2-10: 1, then placing the mixture into a vacuum drying oven for deaeration for 1-2 hours, taking out the mixture after bubbles completely disappear, spreading the mixture on a glass plate, deaerating for 20-40 minutes for the second time, pouring the mixture into a mold, and curing and molding the mixture at the temperature of 60-75 ℃ for 2-4 hours to obtain a patch;
(2) oxygen plasma treatment: cleaning and drying the patch obtained in the step (1), then treating the patch for 30-60 s by using oxygen plasma, then soaking the patch in 0.4-0.6 wt% of lauryl sodium sulfate solution for 20-40 s, and finally washing and drying the patch in sequence to obtain the surface of polydimethylsiloxane; wherein, the radio frequency power is 120-140W during the oxygen plasma treatment, and the oxygen flow is 150-160 sccm;
(3) grafting hydrophobic molecules: 3D printing a mask on the surface of the polydimethylsiloxane obtained in the step (2) by using a water-soluble polymer, then placing the mask in a nitrogen atmosphere, introducing mixed gas, heating at 60-80 ℃ for 60-120 min, cooling to room temperature, taking out the seal, and finally cleaning for 2-4 times by using deionized water to obtain an invisible anti-counterfeiting seal; wherein the mixed gas is prepared by the following method: heating hydrophobic molecules to be in a gaseous state, and then mixing the hydrophobic molecules with nitrogen according to the volume ratio of 1:1 to obtain mixed gas.
2. The method for preparing the invisible anti-counterfeiting stamp according to claim 1, wherein the viscosity of the polydimethylsiloxane is 10 to 2000 mPa.s.
3. The method for preparing an invisible anti-counterfeiting stamp according to claim 1, wherein the curing agent is Dow Corning 184 curing agent, tetraethoxysilane or February dibutyl tin cinnamate.
4. The method for preparing the invisible anti-counterfeiting stamp according to claim 1, wherein in the step (2), the patch is sequentially subjected to ultrasonic cleaning for 1-2 times by using deionized water, acetone and absolute ethyl alcohol, and then is dried by using compressed air.
5. The method for preparing the invisible anti-counterfeiting stamp according to claim 1, wherein in the step (2), the invisible anti-counterfeiting stamp is finally washed with deionized water for 20-40 s and dried with nitrogen.
6. The method for preparing the invisible anti-counterfeiting stamp according to claim 1, wherein the flow rate of the mixed gas is 0.1-0.2L/min.
7. The method for preparing an invisible anti-counterfeiting stamp according to claim 1, wherein the hydrophobic molecule is trimethoxy (1H,1H,2H, 2H-heptadecafluorodecyl) silane, trimethoxy (1H,1H,2H, 2H-nonafluorohexyl) silane or trimethoxy (1H,1H,2H, 2H-tridecafluorooctyl) silane.
8. The method for preparing the invisible anti-counterfeiting stamp according to claim 1, wherein the water-soluble polymer is polyethyleneimine, polyacrylamide or methoxy-terminated polyethylene glycol.
9. The invisible anti-counterfeiting stamp prepared by the preparation method of the invisible anti-counterfeiting stamp according to any one of claims 1 to 8.
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| CN202010668204.8A CN111976070A (en) | 2020-07-13 | 2020-07-13 | Invisible anti-counterfeiting stamp and preparation method thereof |
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| CN202010668204.8A CN111976070A (en) | 2020-07-13 | 2020-07-13 | Invisible anti-counterfeiting stamp and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114624814A (en) * | 2022-05-12 | 2022-06-14 | 天津工业大学 | Flexible electrocardio demodulation electron skin based on polymer photon integrated chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114624814A (en) * | 2022-05-12 | 2022-06-14 | 天津工业大学 | Flexible electrocardio demodulation electron skin based on polymer photon integrated chip |
| CN114624814B (en) * | 2022-05-12 | 2022-07-29 | 天津工业大学 | Flexible electrocardio demodulation electron skin based on polymer photon integrated chip |
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Application publication date: 20201124 |