CN107913061A - A kind of production method of graphene electrocardioelectrode - Google Patents
A kind of production method of graphene electrocardioelectrode Download PDFInfo
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- CN107913061A CN107913061A CN201711280422.9A CN201711280422A CN107913061A CN 107913061 A CN107913061 A CN 107913061A CN 201711280422 A CN201711280422 A CN 201711280422A CN 107913061 A CN107913061 A CN 107913061A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
Abstract
The invention discloses a kind of production method of graphene electrocardioelectrode, electrocardioelectrode is made by mixing and being reduced through ultra violet lamp the solution containing silver ion and graphene in the present invention, silver and the incompatible phenomenon of graphene are overcome, enhances the Raman scattering of graphene.Electrocardioelectrode produced by the present invention overcomes silver and the incompatible problem of graphene, enhances the Raman scattering of graphene, improves the electrical efficiency and stability and service life of electrocardioelectrode.
Description
Technical field
The invention belongs to electrocardioelectrode field, more particularly to a kind of production method of graphene electrocardioelectrode.
Background technology
Raman scattering:When light comes out from an atom or molecular scattering, most of photon, is all elastic scattering
, this is known as Rayleigh scattering.Under Rayleigh scattering, the photon that scatters out, photon during with injecting, its energy, frequency with
Wavelength is identical.It is about to occur one, after scattering in 10,000,000 photons however, there is the photon that sub-fraction scatters
Frequency can produce change, photon frequency when normally below injecting, is known as Raman scattering, the reason is that incident photon and medium
Energy exchange occurs between molecule.
The enhancing of Raman scattering signal is depending between the shape, size and substrate and molecular detection of Raman scattering substrate
Adsorptivity.Silver is one of base material of effective enhancement effect.Silver can produce 6 more than 10 in the range of certain length
The enhancement effect of power, the interstitial site of ion and sharp projection outer surface, local enhancement up to 10 14 powers.
Electromagnetic enhancement mechanism:It is a kind of physical model, mainly describes incident light and be radiated at certain roughness
Surface local optical electric field can be produced during substrate surface, so that the Raman scattering for substantially increasing absorption in substrate surface molecule is strong
Degree.The characteristics of effect is:
(1) enhancement effect depends on the electronic structure of prepared base metal and the roughness of substrate surface;
(2) special chemical bond need not be formed between substrate and binding molecule, enhancement effect and binding molecule are unrelated.Mesh
The preceding Electromagnetic enhancement model being most widely recognized as is surface plasma body resonant vibration model.
Surface plasma body resonant vibration (Surface plasma resonance, SPR) theoretical model is thought, due to metal watch
Face has certain roughness and there is the electronics moved freely, and incident laser causes surface free electron collective excitation to cause
Surface plasmon oscillations, when the frequency of electromagnetic wave and the identical frequency of plasma oscillation, will produce plasma and be total to
Shake, greatly enhance surface field, so as to increase the Raman scattering signal of binding molecule.
Chemical enhancement mechanism:
The class to interact between the theoretical mainly description substrate surface of Chemical enhancement, binding molecule and incident light three is total to
Shaking strengthens phenomenon, which depends on the energy level of adsorption potential, bonding configuration and binding molecule, wherein most typically electric charge transfer
Mechanism.Graphene is due to preferable two-dimension plane structure and the enrichment to organic molecule, the base that can strengthen as Raman
Bottom, this effect are known as graphene enhancing Raman scattering (GERS).Under the induction of incident light, electronics is from graphene fermi level
Lowest unoccupied molecular orbital (LUMO) or the transfer of highest occupied molecular orbital (HOMO) energy level to molecule, when the energy of incident photon
When energy of the amount with electronics between graphene and binding molecule is equal, it will produce resonance, cause effective polarizability of molecule to increase
Greatly, the Raman signal for showing as molecule is increased.
Electrocardioelectrode is a kind of special arrangement for being used to measure the potential difference due to heart contraction generation, at present generally use
Silver alloy is made, but at present material make electrocardioelectrode is anti-interference, antinoise and the ability such as anti-interference are poor, and
Micro-current by when easily produce polarization.
As a kind of newfound high-quality electrode material, the electrochemistry sensor using it as electrode has good graphene
Repeatability and reproducibility, the development in terms of sensor have good prospect.Graphene is by carbon as a kind of new material
Atom close-packed arrays into the netted hexaplanar crystal of honeycomb, thickness is only single atom, is current optimal two-dimensional nano
Material.The hybrid form of chemical bond is SP between carbon atom in graphene2Hydridization, also has a p orbital electron remaining, is formed big
Pi bond, pi-electron can move freely, and assign graphene good electric conductivity.
Silver-colored (0.63 × 106S/cm) is nature electric conductivity and the highest metal of electrical conductivity, available for improvement graphene
Electric conductivity and raising electrical conductivity;But silver is bad with the compatibility of graphene, causes the Raman scattering of graphene to strengthen and do not reach
Perfect condition, and then cause after mixing since Raman scattering intensities are relatively low so that the AC impedance of electrocardioelectrode is higher, interior
Portion's noise is larger, defibrillation restorability is not high.
The content of the invention
To solve the above problems, the present invention provides a kind of production method of graphene electrocardioelectrode, it is produced by the present invention
Electrocardioelectrode overcomes silver and the incompatible problem of graphene, enhances the Raman scattering of graphene, improves electrocardioelectrode
Electrical efficiency and stability and service life.
To reach above-mentioned technique effect, the technical scheme is that:
A kind of production method of graphene electrocardioelectrode, it is characterised in that include the following steps:
Graphene is mixed with the solution of silver ion and reduces silver ion electrocardioelectrode is made.
Further to improve, the solution of the silver ion is silver nitrate solution, is reduced by the method for ultraviolet light
Silver ion.
It is further to improve, include the following steps:
Step 1: hydrazine hydrate and ammonium hydroxide are added in graphene aqueous solution, 4000 leave the heart 1 it is small when and 80 DEG C of heating reactions
The volume ratio of the graphene solution reduced, wherein hydrazine hydrate, ammonium hydroxide and graphene aqueous solution is 0.3-0.6:3.4-7.7:
92-96。
Step 2: resin is dipped into the graphene solution after reduction, then resin is dried;
It is immersed in Step 3: rear and with graphene resin will be dried in mixed solution, silver is reduced through ultra violet lamp
Ag/Cn electrodes are made in ion, and the sodium borohydride and 3.5%- of 0.05mol/L to 0.9mol/L are included wherein in mixed solution
10% silver nitrate.
It is further to improve, in the step 2, resin ABS, PC or/and compound carbon fibre resin.
Further to improve, in the step 1, graphene aqueous solution is 3% graphene aqueous solution, and heating-up temperature is
60-100 DEG C, heating time 30-60min.
Further to improve, the heating-up temperature is 90 DEG C, heating time 60min.
It is further to improve, in the step 2, soaking time 10-50min.
Further to improve, the soaking time is 30min.
Further to improve, in the step 3, electrode is made in ultra violet lamp 60-100min reduction silver ions.
Further to improve, in the step 3, after obtaining mixed solution, it is 1 to add with silver nitrate molar ratio:2.5
To 1:5 silver chlorate, and rear and with graphene resin will be dried after being sufficiently stirred and is immersed in the mixed solution, through ultraviolet
Ag/Agcl/Cn electrodes are made in light irradiation reduction silver ion.
Embodiment
Technical scheme is illustrated below by way of embodiment.
Shown in 1. the making material of electrocardioelectrode is generally as follows:The making material of electrode is usually:Ag/Agcl/Cn or Ag/
Cn。
2. performance indicator
2.1 marks require
The mark of disposable electrocardioelectrode should meet the regulation of this chapter, and mark includes at least following message:
A) term of validity is stated
The term of validity:2 years
B) suitable precautionary measures and warning, including the service life of electrode and should just be beaten when in use on Electrode pack
The warning opened;
C) suitable operation instruction, including the processing routine to skin, if not preset glue during electrode, should also include electricity
The preparation of pole.
D) explanation in relation to shelf appeal
Relative humidity should be stored in no more than 80 percent, non-corrosiveness gas and draughty interior.
2.2 performance requirement
2.2.1 AC impedance
AC impedance represents the composite measurement index of impedance and the capacitive reactance of electrode pair.During test, instrument passes through two electrodes
Test cable applies the 10Hz simple sinusoidal alternating currents that peak-to-peak value is 100 μ Α in electrode pair, in this case the exchange resistance of electrode pair
It is anti-that 3K Ω are not to be exceeded.
2.2.2 DC offset voltage
For a pair of of glue to the electrode pair of connection after the stationary phase of 1min, the offset voltage of appearance should be not more than 100mV.
2.2.3 compound imbalance unstability and internal noise
Voltage signal in certain frequency range is presented on by the change of electrode pair offset voltage.After forming electrode pair,
Through stationary phase after one minute, in subsequent five minutes, by electrode test cable measuring electrode to the frequency in 0.15-100HZ
The peak-to-peak value of the interior noise produced in band (fundamental frequency response) should be not more than 150 μ V.
2.2.4 defibrillation overload is recovered
Electrode pair recovers the ability of ECG detecting after being subject to defibrillation current flow to stimulate.During test, 10 μ F capacitances in instrument
Device charges to 200V, and 100 Ω resistance in electrode pair and machine are formed series loop by electrode test cable discharges, in capacitance
Device starts the 5S after electric discharge, and the magnitude of voltage in electrode pair should be not more than 100mV;In 30S thereafter, the every 10S's of the voltage
The average rate of change should be not more than ± 1mV/S.And require after 4 above-mentioned examinations are carried out, the 10HZ AC impedances of electrode pair are not more than
3KΩ。
2.2.5 bias current tolerance level
For electrode pair under the long duration of action of a given small DC current, its DC offset voltage keeps stable energy
Power.The 200nA binding posts of electrode pair and instrument connect, and the DC current continuous action of subsequent 200nA is in electrode pair, up to 8
It is interior during whole that 100mV should be not more than to the voltage change at both ends with electrode test cable measuring electrode more than hour.
3. the method for inspection
3.1 marks require
According to 2.1 requirement, verified by observing.
3.2 performance requirement
3.2.1 AC impedance
The impedance of electrode pair can be by applying the sine-wave current of a known amplitude and observing the electricity at electrode pair both ends
Pressure amplitude degree determines.The size of impedance is exactly the ratio between amplitude of voltage and electric current.One suitable power supply stream can be with one just
The resistance of string signal (voltage) source and a 1M Ω (or bigger) is connected generation with electrode pair.This impressed current should be no more than
100uA (peak-peak).
Measuring electrode calculates the voltage peak-to-peak value at both ends, the numerical value of electrode pair AC impedance with formula below, Z
Numerical value should meet the regulations of 2.1.1 bars.
In formula:V(P-P)--- the voltage peak-to-peak value at electrode pair both ends
A(P-P)--- the peak-to-peak value of the simple sinusoidal alternating current applied to electrode pair
Z--- electrode pair AC impedances
3.2.2 DC offset voltage
DC offset voltage should use two glue to gel electrode and minimum input impedance a 10M Ω, resolution ratio 1mV or more
High DC voltmeter composition circuit measures.The bias current that measuring instrument puts on tested electrode should be less than 10nA.Should
After the stabilizer of 1min, measured before 1.5min.Its result should meet the regulation of 2.2.2 bars.
3.2.3 compound imbalance unstability and internal noise
After the stabilizer of 1min, the output voltage of test loop should be no more than ± 150uV (peak-peak) in 5min.It is defeated
Hz-KHz 0.01Hz~1000Hz, the apparatus measures of minimum input impedance 10M Ω should be used by going out voltage.Alternatively,
Input impedance is that the oscillograph of 1M Ω can replace 1M Ω resistance.Component error ± 10%.Capacitor should be nonpolarity type.As a result
The regulation of 2.2.3 bars should be met.
3.2.4 defibrillation overload is recovered
The 10 μ F capacitors of 200V are charged to, is discharged by the series loop of electrode pair and 100 Ω resistance, is opened in capacitor
Begin the 5s after discharging, and the absolute value of polarization electromotive force of the glue to the electrode pair of gemel connection is no more than 100mV;Thereafter in 30s,
The change rate of residual polarization electromotive force is not more than ± 1mV/s.After above-mentioned experiment is carried out by this requirement, the 10Hz exchanges of electrode pair
Impedance should be not more than 3k Ω.
This test measurement electrode reduces its existing voltage after defibrillation, recovers the ability of electrocardio trace.Measurement should be by subordinate
Step;
A) electrode stacks glue to gemel connection and is connected to hookup, switchs SW1 closures at this time, SW2 and SW3 are disconnected;
B) at least make its fully charged to 200V capacitance charging 10s;Then switch SW1 is disconnected;
C) switch SW2 closures are kept enough for a long time, so that capacitance runs through electrode pair and puts a little until capacitance voltage is small
In 2V.(time is no more than 2s);
D) switch SW2 is disconnected immediately, closes SW3, electrode pair is connected to imbalance measuring system;
E) every 10s recording electrodes misalignment rate in the 5th second and subsequent 30s after switch SW3 closures, is accurate to 1mV.Again
Overload and measure in triplicate;
F) above testing procedure is repeated to all tested electrode pairs.Four electric discharges of capacitance, the mistake of the 5th second after discharging every time
Adjust voltage to be no more than 100mV, and the difference (after the initial 5s times) of any adjacent 10s should no more than ± 11mV (±
1mV/s)。
Pay attention to:Hookup should have following feature:All capacitances and resistance should setting 90% to 110% it
It is interior.0~10Hz input impedance of the input amplifier of imbalance recorder should be 10M Ω ± 10%, and bias current should be less than
200nA.The error of voltage recording equipment should the change of ± 5%, 10mV full-scale without departing from 100mV should be measurable, and
Its error is without departing from ± 1mV.For this reason, the full scale and resolving power of recorder can be adjusted on demand.
3.2.5 bias current tolerance level
It is using by least 2V voltage sources and an appropriate current setting resistance current source in series, 200nA is straight
Galvanic electricity stream is applied to a pair of of glue in the electrode pair of gemel connection.The potential at the both ends of electrode pair should use a minimum input impedance
100M Ω, resolution ratio are 5mV or higher, and DC voltmeter of the input bias current less than 10nA monitors.Voltage on electrode
Change at least measures once per hour during observation.Initial offset voltage should after electrode pair is connected into 1min to 5min
It is interior, and measured before bias current is applied.Then, measure as caused by bias current relative to the imbalance electricity of initial offset voltage
Buckling.
4. term
4.1 electrode pair
Voltage signal in certain frequency range is presented on by the change of electrode pair offset voltage.Form electrode pair.Electricity
Ability extremely to recovering ECG detecting after being subject to defibrillation current flow to stimulate.Electrode pair a given small DC current it is long when
Between act under, its DC offset voltage keeps stable ability.
4.2 DC offset voltage
For a pair of of glue to the electrode pair of connection after the stationary phase of 1min, the offset voltage of appearance should be not more than 100mV.
4.3 AC impedance
AC impedance represents the composite measurement index of impedance and the capacitive reactance of electrode pair.During test, instrument passes through two electrodes
Test cable applies the 10Hz simple sinusoidal alternating currents that peak-to-peak value is 100 μ Α in electrode pair, in this case the exchange resistance of electrode pair
It is anti-that 3K Ω are not to be exceeded.
4.4 internal noise
Voltage signal in certain frequency range is presented on by the change of electrode pair offset voltage.After forming electrode pair,
Through stationary phase after one minute, in subsequent five minutes, by electrode test cable measuring electrode to the frequency in 0.15-100HZ
The peak-to-peak value of the interior noise produced in band (fundamental frequency response) should be not more than 150 μ V.
4.5 simulated defibrillation recovery
Electrode pair recovers the ability of ECG detecting after being subject to defibrillation current flow to stimulate.During test, 10 μ F capacitances in instrument
Device charges to 200V, and 100 Ω resistance in electrode pair and machine are formed series loop by electrode test cable discharges, in capacitance
Device starts the 5S after electric discharge, and the magnitude of voltage in electrode pair should be not more than 100mV;In 30S thereafter, the every 10S's of the voltage
The average rate of change should be not more than ± 1mV/S.And require after 4 above-mentioned examinations are carried out, the 10HZ AC impedances of electrode pair are not more than
3KΩ。
4.6 bias current tolerance levels
For electrode pair under the long duration of action of a given small DC current, its DC offset voltage keeps stable energy
Power.The 200nA binding posts of electrode pair and instrument connect, and the DC current continuous action of subsequent 200nA is in electrode pair, up to 8
It is interior during whole that 100mV should be not more than to the voltage change at both ends with electrode test cable measuring electrode more than hour.
Embodiment 1
A kind of production method of graphene electrocardioelectrode, includes the following steps:
Step 1: the ammonium hydroxide that pure hydrazine hydrate and concentration are 0.3% is added in the graphene aqueous solution that concentration is 7.7%,
4000 leave the heart 1 it is small when and 80 DEG C heating 30min react the graphene solution reduced, wherein hydrazine hydrate, ammonium hydroxide and graphite
The volume ratio of aqueous solution is 0.3:7.7:92.
Step 2: resin is dipped into the graphene solution after reduction, then resin is dried;
Step 3: sodium borohydride/deionized water solution is slowly dropped in silver nitrate aqueous solution, stirred when being added dropwise,
Until stir evenly, mixed solution is obtained, the concentration of silver nitrate is 6.5% in mixed solution, and the concentration of sodium borohydride is
0.35mol/L;Rear and with graphene resin will be dried again and is immersed in 10min in the mixed solution, through ultra violet lamp also
Ag/Cn electrodes are made in former silver ion.(Cn represents graphene) the ultra violet lamp time is usually 60-100min.
Embodiment 2
A kind of production method of graphene electrocardioelectrode, includes the following steps:
Step 1: the ammonium hydroxide that pure hydrazine hydrate and concentration are 0.35% is added into the graphene aqueous solution that concentration is (5.65) %
In, 4000 leave the heart 1 it is small when and 80 DEG C heating 60min react the graphene solution reduced, wherein hydrazine hydrate, ammonium hydroxide and stone
The volume ratio of black aqueous solution is 0.35:5.65:94.
Step 2: resin is dipped into the graphene solution after reduction, then resin is dried;
Step 3: sodium borohydride/deionized water solution is slowly dropped in silver nitrate aqueous solution, stirred when being added dropwise,
Until stir evenly, mixed solution is obtained, the concentration of silver nitrate is 9% in mixed solution, and the concentration of sodium borohydride is
0.05mol/L;, then rear and with graphene resin will be dried and be immersed in 50min in the mixed solution, through ultra violet lamp also
Ag/Cn electrodes are made in former silver ion.
Embodiment 3
A kind of production method of graphene electrocardioelectrode, includes the following steps:
Step 1: the ammonium hydroxide that pure hydrazine hydrate and concentration are 0.4% is added into the graphene aqueous solution that concentration is (4.6) %
In, 4000 leave the heart 1 it is small when and 80 DEG C heating 60min react the graphene solution reduced, wherein hydrazine hydrate, ammonium hydroxide and stone
The volume ratio of black aqueous solution is 0.4:4.6:95.
Step 2: resin is dipped into the graphene solution after reduction, then resin is dried;
Step 3: sodium borohydride/deionized water solution is slowly dropped in silver nitrate aqueous solution, stirred when being added dropwise,
Until stir evenly, mixed solution is obtained, the concentration of silver nitrate is 10% in mixed solution, and the concentration of sodium borohydride is
0.9mol/L, then rear and with graphene resin will be dried and be immersed in 30min in the mixed solution, reduced through ultra violet lamp
Ag/Cn electrodes are made in silver ion.
Embodiment 4
A kind of production method of graphene electrocardioelectrode, includes the following steps:
Step 1: the ammonium hydroxide that pure hydrazine hydrate and concentration are 0.6% is added in the graphene aqueous solution that concentration is 3.4%,
4000 leave the heart 1 it is small when and 80 DEG C heating 60min react the graphene solution reduced, wherein hydrazine hydrate, ammonium hydroxide and graphite
The volume ratio of aqueous solution is 0.6:3.4:96.
Step 2: resin is dipped into the graphene solution after reduction, then resin is dried;
Step 3: sodium borohydride/deionized water solution is slowly dropped in silver nitrate aqueous solution, stirred when being added dropwise,
Until stir evenly, mixed solution is obtained, the concentration of silver nitrate is 10% in mixed solution, and the concentration of sodium borohydride is
0.15mol/L, then rear and with graphene resin will be dried and be immersed in 30min in the mixed solution, then through ultra violet lamp
Reduce silver ion and Ag/Cn electrodes are made.
Embodiment 5
On the basis of embodiment 4, after obtaining mixed solution, it is 1 to add with silver nitrate molar ratio:5 silver chlorate, and
Rear and with graphene resin will be dried after being sufficiently stirred and is immersed in 30min in the mixed solution, is reduced through ultra violet lamp
Ag/Agcl/Cn electrodes are made in silver ion.
Embodiment 6
On the basis of embodiment 4, after obtaining mixed solution, it is 2.5 to add with silver nitrate molar ratio:1 silver chlorate,
And rear and with graphene resin will be dried after being sufficiently stirred and is immersed in 30min in the mixed solution, through ultra violet lamp also
Ag/Agcl/Cn electrodes are made in former silver ion.
According to above-mentioned detection method as a result, embodiment 1-6 and the detection data of commercially available electrocardioelectrode are as follows:
As can be known from the above table, the AC impedance of electrocardioelectrode made from this patent, internal noise, defibrillation restorability are superior to
Existing electrocardioelectrode.
The specific guiding embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto,
All changes for carrying out unsubstantiality to the present invention using this design, should all belong to the behavior for invading protection scope of the present invention.
Claims (10)
1. a kind of production method of graphene electrocardioelectrode, it is characterised in that include the following steps:
Graphene is mixed with the solution of silver ion and reduces silver ion electrocardioelectrode is made.
2. the production method of graphene electrocardioelectrode as claimed in claim 1, it is characterised in that the solution of the silver ion
For silver nitrate solution, silver ion is reduced by the method for ultraviolet light.
3. the production method of graphene electrocardioelectrode as claimed in claim 1, it is characterised in that include the following steps:
Step 1: hydrazine hydrate and ammonium hydroxide are added in graphene aqueous solution, 4000 leave the heart 1 it is small when and 80 DEG C of heating reactions obtain
The volume ratio of the graphene solution of reduction, wherein hydrazine hydrate, ammonium hydroxide and graphene aqueous solution is 0.3-0.6:3.4-7.7:92-
96;
Step 2: resin is dipped into the graphene solution after reduction, then resin is dried;
It is immersed in Step 3: rear and with graphene resin will be dried in mixed solution, silver ion is reduced through ultra violet lamp
Ag/Cn electrodes are made, the sodium borohydride comprising 0.05mol/L to 0.9mol/L and 3.5%-10% wherein in mixed solution
Silver nitrate.
4. the production method of graphene electrocardioelectrode as claimed in claim 3, it is characterised in that in the step 2, resin
For ABS, PC or/and compound carbon fibre resin.
5. the production method of graphene electrocardioelectrode as claimed in claim 3, it is characterised in that in the step 1, graphite
Aqueous solution is the graphene aqueous solution of 3.4%-7.7%, and heating time 30-60min, the concentration of ammonium hydroxide is 0.3%-
0.6%.
6. the production method of graphene electrocardioelectrode as claimed in claim 5, it is characterised in that the heating time is
30min。
7. the production method of graphene electrocardioelectrode as claimed in claim 3, it is characterised in that in the step 2, immersion
Time is 10-50min.
8. the production method of graphene electrocardioelectrode as claimed in claim 7, it is characterised in that the soaking time is
30min。
9. the production method of graphene electrocardioelectrode as claimed in claim 3, it is characterised in that ultraviolet in the step 3
Electrode is made in light irradiation 60-100min reduction silver ions.
10. the production method of graphene electrocardioelectrode as claimed in claim 3, it is characterised in that in the step 3, obtain
After mixed solution, it is 1 to add with silver nitrate molar ratio:2.5 to 1:5 silver chlorate, and rear and band will be dried after being sufficiently stirred
The resin for having graphene is immersed in the mixed solution, and Ag/Agcl/Cn electrodes are made through ultra violet lamp reduction silver ion.
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CN109559851A (en) * | 2018-11-15 | 2019-04-02 | 中南大学 | A kind of graphene electrocardioelectrode and preparation method thereof |
CN110289410A (en) * | 2019-06-28 | 2019-09-27 | 陕西科技大学 | A kind of MnO with height ratio capacity2The preparation method of/Ag composite material |
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