CN104739403A - Graphene nanowall flexible electrocardio-electrode and preparation method thereof - Google Patents
Graphene nanowall flexible electrocardio-electrode and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a graphene nanowall flexible electrocardio-electrode and a preparation method thereof. The flexible electrocardio-electrode comprises a flexible substrate layer and a graphene nanowall layer, wherein a layer of conductive silver adhesives coats the side edge of the graphene nanowall layer and connected with a metal conductor. The graphene nanowall flexible electrocardio-electrode is high in flexibility, and can be closely clung to a body surface; the acquired potential difference is accurate; in addition, the electrode is small in impedance, outstanding in conductive performance, difficult to be polarized, resistant to interference and resistant to noise; in addition, the service life of the electrode can be greatly prolonged due to the corrosion resistance of graphene. The graphene nanowall flexible electrocardio-electrode is simple and convenient to operate, short in manufacturing cycle and easily produced by mass.
Description
Technical field
The invention belongs to technical field of medical instruments, be specifically related to flexible electrocardioelectrode of a kind of graphene nano wall and preparation method thereof.
Background technology
Heart is in each cardiac cycle, and all along with bioelectric change in the process that pacemaker, atrium, ventricle are in succession excited, these bioelectric changes are called electrocardio.Because the tissue around heart and body fluid can conduct electricity, therefore, can heart be power supply, the summation that Single Cardiac Cell changes, as volume conductor, be conducted to body surface by human body.So there is potential difference between different sites or be in isoelectric level, the change of these electrical activities is collected forming curves figure, is exactly electrocardiogram.Again by ecg analysis, the state of human heart just can be understood.
Between different body surface place, the acquisition mode of potential difference has significant impact for electrocardiogram accurate response human heart state.That generally applies now has much as the electrode of potential difference between the different body surface place of collection, but is all that main material is prepared from metal mostly.And metal material is as electrode, its corrosion resistance, anti-interference and noise resisting ability is all poor, micro-electric current by time easily produce polarization.
Graphene has shown very excellent physical property after being stripped out first by British scientist Andre Geim and Konstantin Novoselov from 2004.The resistivity of Graphene only has an appointment 10
-8Ω m, and electron mobility is up to 15,000cm
2v
-1s
-1.Meanwhile, carbon does not almost have nuclear magnetic moment, and Graphene has good electromagnetic shielding capability.Therefore, someone considers top layer Graphene being added to metal electrode as conductive layer, but is made with following shortcoming like this: there is contact resistance between Graphene and metal electrode, effectively can not improve the electric conductivity of electrode.
Therefore, be necessary to be improved further the scheme adopting Graphene as electrocardioelectrode on the basis of existing technology.
Summary of the invention
In view of this, the object of the present invention is to provide the flexible electrocardioelectrode of a kind of graphene nano wall, this electrode integrates flexibility, good electric conductivity, not easily polarization, anti-interference and antimierophonic advantage, can fit with body surface better; Present invention also offers the preparation method of above-mentioned electrode.
The technical solution used in the present invention is as follows:
1, the flexible electrocardioelectrode of graphene nano wall, described flexible electrocardioelectrode comprises flexible substrate layer and graphene nano wall layers; Described graphene nano wall layers edge scribbles one deck conductive silver glue, described conductive silver glue connection metal wire.
Further, described plain conductor is silver-colored wire.
Further, described flexible substrate layer and graphene nano wall layers are bonded by binding agent.
Further, described flexible substrate layer is polyethylene terephthalate or take polyimides as the polymer of base material.
Further, described polyimides is that the polymer of base material comprises polybismaleimide or norbornene capped polyimides resin.
Further, described graphene nano wall layers is prepared by plasma enhanced chemical vapor deposition method.
Further, described plasma enhanced chemical vapor deposition method actual conditions is growth pressure 30 ~ 100Pa, and growth temperature is 600-750 DEG C, and radio-frequency power is 100W, gases used be hydrogen and methane is the gaseous mixture that 2:3 forms by volume, and growth time is 5-30min.
Further, described binding agent is polydimethylsiloxane, UV ultra-violet curing glue or thermosetting resin.
2, the preparation method of the flexible electrocardioelectrode of graphene nano wall, comprises the steps:
(1) by plasma enhanced chemical vapor deposition method at sheet metal surface deposition one deck graphene nano wall thin film;
(2) one deck conductive silver glue is coated with in graphene nano wall film edge, connection metal wire on conductive silver glue;
(3) the graphene nano wall film transfer containing conductive silver glue and plain conductor step (2) obtained is in flexible substrate;
(4) remove sheet metal and namely obtain the flexible electrocardioelectrode of graphene nano wall.
Further, described sheet metal is Copper Foil or nickel foil.
Further, graphene nano wall thin film, for be coated with a layer binder on flexible substrates, to be overlapped with flexible substrate by binding agent and is fixed thereon by described step (3) described transfer step.
Further, the described removal sheet metal of described step (4) is adopt the method for etching to remove.
Beneficial effect of the present invention is: the present invention is by plasma enhanced chemical vapor deposition method, first growing graphene nm wall on sheet metal, then graphene nano wall is transferred in flexible substrate, finally etches the preparation that sheet metal realizes the flexible electrocardioelectrode of graphene nano wall.Because graphene nano wall is the grapheme material that a kind of brim height formed by the two-dimensional graphene lamella perpendicular to substrate opens, therefore the excellent physical property of Graphene is still remained, in addition, graphene nano wall is compared with Graphene, also there is electric conductivity better, the feature that contact area is larger, makes it be more suitable for directly using as electrocardioelectrode, and without the need to metal electrode conbined usage.The flexible electrocardioelectrode of graphene nano wall that the present invention obtains due to flexibility better, fit more closely with body surface, the potential difference of collection is more accurate; Further, described electrode impedance is low, and electric conductivity is excellent, not easily produces polarization, anti-interference, antinoise.In addition, the corrosion resistance of Graphene also can extend the service life of electrode greatly.The present invention is easy and simple to handle, and fabrication cycle is short, easier large-scale production.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing:
The flexible electrocardioelectrode of graphene nano wall described in Fig. 1 embodiment 1;
The flexible electrocardioelectrode of graphene nano wall described in Fig. 2 embodiment 2.
Detailed description of the invention
Below the preferred embodiments of the present invention are described in detail.The experimental technique of unreceipted actual conditions in embodiment, the usually conveniently conditioned disjunction condition of advising according to manufacturer.
Embodiment 1
The flexible electrocardioelectrode of graphene nano wall described in the present embodiment is without the need to bonding by binding agent, and flexible substrate used, namely polydimethylsiloxane has the effect of binding agent simultaneously.
The preparation method (flow process is shown in Fig. 1) of the flexible electrocardioelectrode of graphene nano wall described in the present embodiment, concrete steps are as follows:
1) Copper Foil is placed in successively acetone, ethanol, deionized water for ultrasonic cleaning 10min, dries up with nitrogen for subsequent use;
2) dried Copper Foil is positioned in plasma reinforced chemical vapor deposition system vacuum cavity carries out the growth of graphene nano wall by plasma enhanced chemical vapor deposition method; The growth conditions of graphene nano wall thin film is pressure 30 ~ 100Pa, growth temperature 600-750 DEG C, gases used is the gaseous mixture (hydrogen volume: methane volumetric=2:3) of hydrogen and methane, and growth time 5-30min, obtains the graphene nano wall thin film on Copper Foil;
3) be coated with one deck conductive silver glue in graphene nano wall film edge, conductive silver glue connects silver-colored wire; Then be placed on warm table by whole material, heating-up temperature 150 DEG C, heat time heating time is 30min, to ensure completion of cure;
4) polydimethylsiloxane is evenly coated in the graphene nano wall film surface containing conductive silver glue and silver-colored wire, coating thickness 1-2mm; Then whole material is placed on 100 DEG C of baking 1h, then in 120 DEG C of baking 1h, polydimethylsiloxane completion of cure;
5) be etch Copper Foil in 3M ferric nitrate, etch period 3h in concentration; After Copper Foil etching is complete, takes out and clean, drying, obtaining the flexible electrocardioelectrode of graphene nano wall.
Embodiment 2
The preparation method (flow process is shown in Fig. 2) of the flexible electrocardioelectrode of graphene nano wall described in the present embodiment, concrete steps are as follows:
1) nickel foil is placed in respectively acetone, ethanol, deionized water for ultrasonic cleaning 10min, dries up with nitrogen for subsequent use;
2) dried Copper Foil is positioned in PCVD system vacuum cavity carries out the film growth of graphene nano wall by plasma enhanced chemical vapor deposition method; The growth conditions of graphene nano wall thin film is pressure 30 ~ 100Pa, growth temperature 600-750 DEG C, gases used is the gaseous mixture (hydrogen volume: methane volumetric=2:3) of hydrogen and methane, and growth time 5-30min, obtains the graphene nano wall thin film on Copper Foil;
3) apply one deck conductive silver glue in graphene nano wall film edge, conductive silver glue connects silver-colored wire; Then be placed on warm table by whole material, heating-up temperature 150 DEG C, heat time heating time is 30min, to ensure completion of cure;
4) polydimethylsiloxane is evenly coated in the graphene nano wall film surface containing conductive silver glue and silver-colored wire, coating thickness is within 1mm, again polyethylene terephthalate is covered on it, overlap with graphene nano wall thin film, last 100 DEG C of baking 1h;
5) be etch Copper Foil in 3M ferric nitrate in concentration, etch period is 3h, Copper Foil etching completely after, take out and clean, drying, obtaining take polyethylene terephthalate as the graphene nano wall flexibility electrocardioelectrode of substrate.
Although it is pointed out that embodiment is enumerated limited, however as well known to those skilled in the art, and still other polymer being such as base material with polyimides can as flexible substrate, binding agent is equally also not limited to polydimethylsiloxane.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (10)
1. the flexible electrocardioelectrode of graphene nano wall, it is characterized in that, described flexible electrocardioelectrode comprises flexible substrate layer and graphene nano wall layers; Described graphene nano wall layers edge scribbles one deck conductive silver glue, described conductive silver glue connection metal wire.
2. the flexible electrocardioelectrode of graphene nano wall according to claim 1, it is characterized in that, described flexible substrate layer and graphene nano wall layers are bonded by binding agent.
3. the flexible electrocardioelectrode of graphene nano wall according to claim 1, is characterized in that, described flexible substrate layer is polyethylene terephthalate or take polyimides as the polymer of base material.
4. the flexible electrocardioelectrode of graphene nano wall according to claim 3, it is characterized in that, described polyimides is the polymer of base material is polybismaleimide or norbornene capped polyimides resin.
5. the flexible electrocardioelectrode of graphene nano wall according to claim 1, it is characterized in that, described graphene nano wall layers is prepared by plasma enhanced chemical vapor deposition method.
6. the flexible electrocardioelectrode of graphene nano wall according to claim 5, it is characterized in that, described plasma enhanced chemical vapor deposition method actual conditions is growth pressure 30 ~ 100Pa, growth temperature is 600-750 DEG C, radio-frequency power is 100W, gases used be hydrogen and methane is the gaseous mixture that 2:3 forms by volume, and growth time is 5-30min.
7. the flexible electrocardioelectrode of graphene nano wall according to claim 2, it is characterized in that, described binding agent is polydimethylsiloxane, UV ultra-violet curing glue or thermosetting resin.
8. the preparation method of the flexible electrocardioelectrode of graphene nano wall described in any one of claim 1-7, is characterized in that, comprise the steps:
(1) by plasma enhanced chemical vapor deposition method at sheet metal surface deposition one deck graphene nano wall thin film;
(2) one deck conductive silver glue is coated with in graphene nano wall film edge, connection metal wire on conductive silver glue;
(3) the graphene nano wall film transfer containing conductive silver glue and plain conductor step (2) obtained is in flexible substrate;
(4) remove sheet metal and namely obtain the flexible electrocardioelectrode of graphene nano wall.
9. the preparation method of the flexible electrocardioelectrode of graphene nano wall according to claim 8, it is characterized in that, described sheet metal is Copper Foil or nickel foil.
10. the preparation method of the flexible electrocardioelectrode of graphene nano wall according to claim 8, it is characterized in that, graphene nano wall thin film, for be coated with a layer binder on flexible substrates, to be overlapped with flexible substrate by binding agent and is fixed thereon by described step (3) described transfer step.
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| CN105286855A (en) * | 2015-11-24 | 2016-02-03 | 深圳大学 | Preparation method of dry ECG (electrocardiogram) electrode |
| CN105286856A (en) * | 2015-11-27 | 2016-02-03 | 电子科技大学 | Graphene flexible electrocardio dry electrode with effect of inhibiting motion artifact |
| CN105372607A (en) * | 2015-12-16 | 2016-03-02 | 中国科学院重庆绿色智能技术研究院 | Flexible graphite alkene nanometer wall magnetic field detection device and preparation method |
| CN105561468A (en) * | 2015-12-17 | 2016-05-11 | 青岛光电医疗科技有限公司 | Electric shock/electrode slice for ectrocardiosignal acquisition or heart defibrillator |
| CN105615880A (en) * | 2015-11-27 | 2016-06-01 | 电子科技大学 | Flexible graphene electroencephalogram capacitive electrode capable of inhibiting motion artifacts |
| CN105973962A (en) * | 2016-04-25 | 2016-09-28 | 陈前伟 | Preparation method of glucose sensor based on graphene nano wall |
| CN106037732A (en) * | 2016-05-11 | 2016-10-26 | 苏州海神联合医疗器械有限公司 | Electromagnetism-shielding surface electromyography electrode and preparation method thereof |
| CN106923822A (en) * | 2017-02-28 | 2017-07-07 | 铂元智能科技(北京)有限公司 | The manufacture method of electrocardioelectrode |
| CN107014799A (en) * | 2017-03-24 | 2017-08-04 | 山东师范大学 | A kind of graphene/silver nano flower-like/PMMA " sandwich " structural flexibility SERS substrates and preparation method thereof |
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| CN110857894A (en) * | 2018-08-24 | 2020-03-03 | 中山大学 | Flexible mechanical sensor capable of detecting stress direction based on ordered graphene and preparation method thereof |
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| CN105286855A (en) * | 2015-11-24 | 2016-02-03 | 深圳大学 | Preparation method of dry ECG (electrocardiogram) electrode |
| CN105286855B (en) * | 2015-11-24 | 2018-02-16 | 深圳大学 | A kind of preparation method of dryness electrocardioelectrode |
| CN105286856A (en) * | 2015-11-27 | 2016-02-03 | 电子科技大学 | Graphene flexible electrocardio dry electrode with effect of inhibiting motion artifact |
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| CN105372607B (en) * | 2015-12-16 | 2018-06-29 | 中国科学院重庆绿色智能技术研究院 | A kind of Flexible graphene nm wall detector for magnetic field and preparation method thereof |
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