CN108294740A - A kind of graphene sensing heart rate system - Google Patents
A kind of graphene sensing heart rate system Download PDFInfo
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- CN108294740A CN108294740A CN201810129173.1A CN201810129173A CN108294740A CN 108294740 A CN108294740 A CN 108294740A CN 201810129173 A CN201810129173 A CN 201810129173A CN 108294740 A CN108294740 A CN 108294740A
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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
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02444—Details of sensor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/12—Manufacturing methods specially adapted for producing sensors for in-vivo measurements
Abstract
The present invention overcomes the defect of traditional heart rate sensor especially graphene sensing heart rate system, provides that a kind of range ability is big, the graphene sensing heart rate system of high sensitivity.Sensor has flexibility high, and manufacture craft is simple, and production scale is big, it is at low cost the advantages that.Graphene heart rate sensor proposed in this paper has outstanding sensitivity and larger working range, can have the good linearity within the scope of compared with low pressure and higher pressure.
Description
Technical field
The invention belongs to heart rate sensor fields, and in particular to a kind of graphene sensing heart rate system.
Background technology
Flexible mechanics device received the extensive concern of academia and industrial circle in recent years.Compared to conventional rigid substrate device
Part, flexible mechanics device greatly improve the deformability of device on the basis of not sacrificing performance, to adapt to
Increasingly complex application scenarios are especially suitable for wearable application.Graphene is to be stripped out from graphite, be made of carbon atom
Only one layer of atomic thickness two dimensional crystal.It is it is found that the first by single layer atomic building material.Graphene
Although very thin, but very tough material, meanwhile, it has good elasticity, stretch range that can reach own dimensions again
20%.Grapheme material has had benefited from the characteristics such as its unique electricity, mechanics, has been widely used in since 2004 are found
In flexible mechanics device, graphene mechanics device has very high sensitivity.However, there is system in existing graphene mechanics sensor
Standby complex process, disadvantages and the problem such as repeatability is poor with consistency, yields is low.Traditional pressure sensor cannot be real simultaneously
Existing highly sensitive and big working range, cause its application it is limited.There is an urgent need to develop novel pressure sensors, in spirit
Sensitivity and two aspect of working range make a breakthrough simultaneously.
At present there are many pressure sensor using graphene, 2012, A.D.Smith et al. completely proposed suspension
The structure of graphene pressure sensor, and in the pressure sensor, since the property of silica and silicon carbide substrate can not show a candle to
The inwardness of graphene, this will produce limitation to the structure of sensor with function.And by Film Thickness, it typically is
Thousands of times of single-layer graphene thickness, transducer sensitivity is also impacted, and low-pressure field is not applicable.
O.K.Kwon et al. proposes modified deflocculated graphite alkene pressure sensor, and this pressure sensor increases one
Top plate with cylindrical supporting leg, transmitting the pressure acted on graphene film by supporting leg will become larger rapidly.This improvement
The pressure sensor of type can be used for low pressure detection environment, and sensitivity is high, and the low pressure range linearity is fine, but the disadvantage is that high
Press the range linearity poor, and structure size is more than general deflocculated graphite alkene pressure sensor.
J.Ma et al. has studied a kind of optical fiber graphene pressure sensor, is by vitreous silica capillary to single-mode optics
Fine end applies air pressure postcapillary in inside and is tapered, then melts capillary and form air cavity.Graphene film covers
On cylindrical cavity, external pressure variation can be not only detected, and sealing function can be played to cavity.This pressure passes
Sensor is compact-sized, and mechanical strength is good.But the disadvantage is that operating pressure is relatively low, pressure-sensitivity is not high, gas in sealing cavity
Have minor leakage.
Invention content
In view of the above analysis, the main purpose of the present invention is to provide a kind of range ability overcoming drawbacks described above is big, spirit
The high graphene sensing heart rate system of sensitivity.In addition, sensor has flexibility high, manufacture craft is simple, and production scale is big, at
This low advantage.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of graphene sensing heart rate system based on pressure detecting is successively from top to bottom including multilayered structure
Substrate layer, layer of pressure sensitive, basal layer.
Further, the first pressure sensitivity electrode layer is additionally provided in the substrate layer and layer of pressure sensitive, described pressure-sensitive
The second pressure sensitivity electrode layer is additionally provided in material layer and basal layer.
Further, the layer of pressure sensitive is made of graphene.
Further, the pressure sensitivity electrode layer is metal conductive oxide layer.
Further, the substrate layer and basal layer are the poroid tissue layer of elasticity.
Further, the specific forming step of the layer of pressure sensitive is：By beaker as in cold water, it is dense that 23ml is added
Sulfuric acid, controlled at 0 DEG C；It is added with stirring the solid mixture of 1g graphite powders and 0.5g sodium nitrate；3g high is added by several times again
Potassium manganate, controlling reaction temperature are no more than 20 DEG C；Potassium permanganate removes water-bath after adding, and is then heated to 35 DEG C or so, continues
30min is stirred, deionized water is slow added into, is heated at high temperature to 90 degree, reacts 15min, warm water is diluted to 140ml, and is added
Appropriate 30% hydrogen peroxide makes solution become glassy yellow, weighs the NaOH solution that said products 0.05g is added to 100mL pH=11
In；Ultrasound 90min prepares dispersion liquid at 150W, removes unstripped graphite oxide at high speed；To graphene oxide point
0.1mL hydrazine hydrates are added in dispersion liquid, 2h is reacted at 90 DEG C, graphene dispersing solution is obtained, the dispersion liquid is deposited to pore mistake
It filters on device, using the method for vacuum suction filter, obtains grapheme material layer, then obtained graphene layer is dried up, obtain required
The graphene layer of thickness.
Technical scheme of the present invention has the following advantages：
Graphene heart rate sensor proposed in this paper has outstanding sensitivity and larger working range, compared with low pressure and
There can be the good linearity within the scope of higher pressure.Show that heart rate sensor of the invention is in pressure limit through actual measurement
20kPa has significant performance when hypersensitivity is 17.2kPa-1 (0Pa-2kPa).
Description of the drawings
Fig. 1 is the structure chart of the graphene sensing heart rate system described in the embodiment of the present invention 1.
Wherein 1 is substrate layer, and 2 be the first pressure sensitivity electrode layer, and 3 be layer of pressure sensitive, and 4 be the second pressure sensitivity electrode layer, and 5 be base
Bottom.
Specific implementation mode
Embodiment one
It is a kind of graphene sensing heart rate system construction drawing of the present invention, including multilayered structure, by upper referring to Fig. 1
It is substrate layer, layer of pressure sensitive, basal layer successively under.
The first pressure sensitivity electrode layer is additionally provided in the substrate layer and layer of pressure sensitive, in the layer of pressure sensitive and base
The second pressure sensitivity electrode layer is additionally provided in bottom.
The layer of pressure sensitive is made of graphene.
The pressure sensitivity electrode layer is made of high-molecular organic material.
The substrate layer and basal layer are the poroid tissue layer of elasticity.
The specific forming step of the layer of pressure sensitive is：By beaker as the 23ml concentrated sulfuric acids in cold water, are added, control is warm
Degree is 0 DEG C；It is added with stirring the solid mixture of 1g graphite powders and 0.5g sodium nitrate；3g potassium permanganate, control is added by several times again
Reaction temperature is no more than 20 DEG C；Potassium permanganate removes water-bath after adding, and is then heated to 35 DEG C or so, continues to stir 30min, then
It is slowly added to deionized water, is heated at high temperature to 90 degree, reacts 15min, warm water is diluted to 140ml, and appropriate 30% dioxygen is added
Water makes solution become glassy yellow, weighs said products 0.05g and is added in the NaOH solution of 100mL pH=11；Surpass at 150W
Sound 90min prepares dispersion liquid, removes unstripped graphite oxide at high speed；It is added into graphene oxide dispersion
0.1mL hydrazine hydrates react 2h at 90 DEG C, obtain graphene dispersing solution, the dispersion liquid is deposited to pore filter device, profit
With the method for vacuum suction filter, grapheme material layer is obtained, then obtained graphene layer is dried up, obtain the graphene of required thickness
Layer material.
The first, second pressure sensitivity electrode layer is vertically arranged to be interdigital, setting in this way, when being acted on by pressure,
The variation of variation and graphene layer resistance between measuring electrode can go out acted on pressure size with composite measurement, and
And if carrying out coordinate calibration to electrode layer in advance, specific pressure position can also be measured, the pressure-sensing can be increased
The scope of application of system.
Embodiment two
Identical as embodiment one, the graphene sensing heart rate system of embodiment two is also multilayered structure.The sensing heart rate system
System is from top to bottom substrate layer, the first layer of pressure sensitive, pressure sensitivity electrode layer, the second layer of pressure sensitive, basal layer successively.
First layer of pressure sensitive and the second layer of pressure sensitive are made of graphene.
The pressure sensitivity electrode layer is high-molecular organic material.
The substrate layer and basal layer are the poroid tissue layer of elasticity.
The specific forming step of the graphene is：By beaker as in cold water, the 23ml concentrated sulfuric acids are added, controlled at
0℃；It is added with stirring the solid mixture of 1g graphite powders and 0.5g sodium nitrate；3g potassium permanganate, control reaction is added by several times again
Temperature is no more than 20 DEG C；Potassium permanganate removes water-bath after adding, and is then heated to 35 DEG C or so, continues to stir 30min, then slowly
Deionized water is added, is heated at high temperature to 90 degree, reaction 15min, warm water is diluted to 140ml, and appropriate 30% hydrogen peroxide is added makes
Solution becomes glassy yellow, weighs said products 0.05g and is added in the NaOH solution of 100mL pH=11；It is ultrasonic at 150W
90min prepares dispersion liquid, removes unstripped graphite oxide at high speed；0.1mL is added into graphene oxide dispersion
Hydrazine hydrate reacts 2h at 90 DEG C, obtains graphene dispersing solution, the dispersion liquid is deposited to pore filter device, using true
The method of suction filter obtains grapheme material layer, then obtained graphene layer is dried up, and obtains the graphene layer material of required thickness
Material.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (7)
1. a kind of graphene sensing heart rate system is from top to bottom substrate layer, pressure sensitive successively including multilayered structure
Layer, basal layer.
2. graphene sensing heart rate system as described in claim 1, wherein also being set in the substrate layer and layer of pressure sensitive
It is equipped with the first pressure sensitivity electrode layer, the second pressure sensitivity electrode layer is additionally provided in the layer of pressure sensitive and basal layer.
3. graphene sensing heart rate system as claimed in claim 2, wherein the layer of pressure sensitive is made of graphene.
4. graphene sensing heart rate system as claimed in claim 3, wherein the pressure sensitivity electrode layer is metal conductive oxide
Layer.
5. graphene sensing heart rate system as claimed in claim 4 is knitted wherein the substrate layer and basal layer are that elasticity is poroid
Nitride layer.
6. graphene sensing heart rate system as claimed in claim 5, wherein the specific forming step of the layer of pressure sensitive is：
By beaker as in cold water, the 23ml concentrated sulfuric acids are added, controlled at 0 DEG C；It is added with stirring 1g graphite powders and 0.5g sodium nitrate
Solid mixture；3g potassium permanganate is added by several times again, controlling reaction temperature is no more than 20 DEG C；Potassium permanganate removes water after adding
Bath, is then heated to 35 DEG C or so, continues to stir 30min, is slow added into deionized water, is heated at high temperature to 90 degree, reaction
15min, warm water are diluted to 140ml, and appropriate 30% hydrogen peroxide, which is added, makes solution become glassy yellow, weighs said products 0.05g
It is added in the NaOH solution of 100mL pH=11；Ultrasound 90min prepares dispersion liquid at 150W, removes do not shell at high speed
From graphite oxide；0.1mL hydrazine hydrates are added into graphene oxide dispersion, 2h is reacted at 90 DEG C, obtains graphene dispersion
Liquid deposits the dispersion liquid to pore filter device, using the method for vacuum suction filter, obtains grapheme material layer, then will
Obtained graphene layer drying, obtains the graphene layer of required thickness.
7. a kind of graphene sensing heart rate system, is multilayered structure, the sensing heart rate system be successively from top to bottom substrate layer,
First layer of pressure sensitive, pressure sensitivity electrode layer, the second layer of pressure sensitive, basal layer, first layer of pressure sensitive and second pressure-sensitive
Material layer is made of graphene, and the pressure sensitivity electrode layer is high-molecular organic material, and the substrate layer and basal layer are elasticity
The specific forming step of poroid tissue layer, the graphene is：By beaker as the 23ml concentrated sulfuric acids in cold water, are added, control is warm
Degree is 0 DEG C；It is added with stirring the solid mixture of 1g graphite powders and 0.5g sodium nitrate；3g potassium permanganate, control is added by several times again
Reaction temperature is no more than 20 DEG C；Potassium permanganate removes water-bath after adding, and is then heated to 35 DEG C or so, continues to stir 30min, then
It is slowly added to deionized water, is heated at high temperature to 90 degree, reacts 15min, warm water is diluted to 140ml, and appropriate 30% dioxygen is added
Water makes solution become glassy yellow, weighs said products 0.05g and is added in the NaOH solution of 100mL pH=11；Surpass at 150W
Sound 90min prepares dispersion liquid, removes unstripped graphite oxide at high speed；It is added into graphene oxide dispersion
0.1mL hydrazine hydrates react 2h at 90 DEG C, obtain graphene dispersing solution, the dispersion liquid is deposited to pore filter device, profit
With the method for vacuum suction filter, grapheme material layer is obtained, then obtained graphene layer is dried up, obtain the graphene of required thickness
Layer material.
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| CN201810129173.1A CN108294740A (en) | 2018-02-08 | 2018-02-08 | A kind of graphene sensing heart rate system |
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| CN201810129173.1A CN108294740A (en) | 2018-02-08 | 2018-02-08 | A kind of graphene sensing heart rate system |
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| CN1551037A (en) * | 2003-05-20 | 2004-12-01 | 祥群科技股份有限公司 | Sliding type fingerprint sensor module assembly and its sensing method |
| CN102520035A (en) * | 2011-11-04 | 2012-06-27 | 上海大学 | Preparation method for copper oxide-graphene nano-complex modification electrode, and application of modification electrode in glucose detection |
| CN102674327A (en) * | 2012-05-17 | 2012-09-19 | 哈尔滨工业大学 | Environment-friendly method for preparing water-soluble grapheme at normal temperature |
| CN102980917A (en) * | 2011-09-06 | 2013-03-20 | 英飞凌科技股份有限公司 | Sensor device and method |
| CN106482628A (en) * | 2016-09-20 | 2017-03-08 | 清华大学 | A kind of large deformation flexible strain transducer and preparation method thereof |
-
2018
- 2018-02-08 CN CN201810129173.1A patent/CN108294740A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1551037A (en) * | 2003-05-20 | 2004-12-01 | 祥群科技股份有限公司 | Sliding type fingerprint sensor module assembly and its sensing method |
| CN102980917A (en) * | 2011-09-06 | 2013-03-20 | 英飞凌科技股份有限公司 | Sensor device and method |
| CN102520035A (en) * | 2011-11-04 | 2012-06-27 | 上海大学 | Preparation method for copper oxide-graphene nano-complex modification electrode, and application of modification electrode in glucose detection |
| CN102674327A (en) * | 2012-05-17 | 2012-09-19 | 哈尔滨工业大学 | Environment-friendly method for preparing water-soluble grapheme at normal temperature |
| CN106482628A (en) * | 2016-09-20 | 2017-03-08 | 清华大学 | A kind of large deformation flexible strain transducer and preparation method thereof |
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Application publication date: 20180720 |