CN105548269A - Carbonized cotton cloth based flexible wearable stress sensing basic unit and preparation method thereof on - Google Patents
Carbonized cotton cloth based flexible wearable stress sensing basic unit and preparation method thereof on Download PDFInfo
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- CN105548269A CN105548269A CN201510890704.5A CN201510890704A CN105548269A CN 105548269 A CN105548269 A CN 105548269A CN 201510890704 A CN201510890704 A CN 201510890704A CN 105548269 A CN105548269 A CN 105548269A
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- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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Abstract
The invention relates to a carbonized cotton cloth based flexible wearable stress sensing basic unit. A cotton cloth layer is clamped and fixed by two PDMS flexible substrates, two sides of the cotton cloth layer are provided with gold film coated conductive adhesive tapes serving as extraction electrodes. The preparation steps consist of: cutting a cotton cloth textile into a desired size, then placing the cut cotton cloth textile in an argon environment at a temperature of 600-800DEG C to conduct calcination for 25-35min; connecting the two gold film coated conductive adhesive tapes serving as extraction electrodes respectively to two sides of the carbonized cotton cloth, and spreading and closely attaching the cotton cloth and the gold film coated conductive adhesive tapes to a PDMS flexible substrate; drying the cotton cloth, the gold film coated conductive adhesive tapes and the PDMS flexible substrate in a 60-70DEG C atmospheric environment for 8-12min; attaching the other PDMS flexible substrate closely to the other sides of the cotton cloth and the gold film coated conductive adhesive tapes; and putting the layer structure overall in a 60-70DEG C atmospheric environment to conduct drying for 8-12min, thus obtaining the carbonized cotton cloth based flexible wearable stress sensing basic unit.
Description
Technical field
The present invention relates to one and prepare flexible wearable stress stress sensing elementary cell and preparation method thereof, especially a kind of based on the common textiles such as cotton, low cost, technique is simple, wearable stress sensing elementary cell of good stability and preparation method thereof.
Background technology
Flexible wearable strain gauge is a kind of novel strain gauge, can be used for the fields such as software robot's technology, tangible display screen, Medical Devices, electronic skin and energy resource collecting.
At present, strain gauge mainly rides in resistance under stress or strain and the change of electric capacity, pressure drag and piezoelectric effect, triboelectric effect etc.Rely on traditional strain gauge of the piezoresistive effect of metal resistance variations under strain and semiconductor, its application receives the restriction of system flexibility.In recent years, the various nano materials comprising carbon nanomaterial, metal nanoparticle, nano wire and nano zine oxide are used to prepare flexibility stress strain transducer.This flexible sensor based on nano material mainly becomes macrostructure by depositing nano-materials to flexible substrate or by nanomaterial assembly.In the middle of this kind of sensor, the sensing unit based on resistance variations shows obvious advantage, and as preparation technology is simple, energy consumption is low.
A lot of strain gauge based on resistance variations is all based on the reticulate texture of nano material.Under stress, cancellated resistance can change.But the cancellated preparation technology of nano material is comparatively complicated, and repeatability is difficult to ensure.Daily yarn fabric used, as cotton clothes etc., has natural reticulate texture and very excellent flexibility.The textiles such as original cotton are insulating material, change the fibrous material that electric conductivity is good after high temperature cabonization into.These features make cotton become a kind of good candidate material in flexible sensing field.But, the relevant report of the pliable pressure sensor up to now also not based on cotton.
Summary of the invention
The object of this invention is to provide a kind of low cost, low energy consumption, preparation technology is simple, and reproducible, flexible wearable stress sensing elementary cell based on carbonization cotton of good stability and preparation method thereof, overcomes the deficiencies in the prior art.
Flexible wearable stress sensing elementary cell based on carbonization cotton of the present invention, comprise the cotton layer of the carbonization being positioned at middle layer, cotton layer is gripped by two panels polydimethylsiloxane flexible substrate, there is the conducting adhesive cloth being covered with golden film as extraction electrode at the dual-side of cotton layer, be covered with the conducting adhesive cloth of golden film between two panels polydimethylsiloxane flexible substrate.
Flexible wearable stress sensing elementary cell based on carbonization cotton of the present invention, has elargol to be connected between wherein said cotton with the conducting adhesive cloth with golden film.
The preparation method of the flexible wearable stress sensing elementary cell based on carbonization cotton of the present invention, step is as follows:
A. cotton textile is cut into required size, being then placed in temperature is calcine 25 ~ 35min under the ar gas environment of 600 ~ 800 DEG C, obtains the cotton of carbonization;
B. the conducting adhesive cloth being covered with golden film as the two panels of extraction electrode is connected to the dual-side place of the cotton after carbonization, then cotton and the conducting adhesive cloth tiling that is covered with golden film is close in polydimethylsiloxane flexible substrate;
C. 8 ~ 12min is dried under cotton and the conducting adhesive cloth and polydimethylsiloxane flexible substrate that are covered with golden film being placed in the atmospheric environment of 60 ~ 70 DEG C;
D. another sheet polydimethylsiloxane flexible substrate is close to cotton and is covered with the another side of conducting adhesive cloth of golden film, make two panels polydimethylsiloxane flexible substrate clamp cotton and be covered with the two sides of conducting adhesive cloth of golden film, forming layer structure;
E. 8 ~ 12min is dried under layer structure entirety Step d obtained is placed in the atmospheric environment of 60 ~ 70 DEG C, must based on the flexible wearable stress sensing elementary cell of carbonization cotton.
The preparation method of the flexible wearable stress sensing elementary cell based on carbonization cotton of the present invention, wherein said polydimethylsiloxane flexible substrate is leather hard, the polydimethylsiloxane flexible substrate preparation method of described leather hard is: be dry 15 ~ 19min under the liquid polydimethylsiloxane of 300 ~ 400 μm is positioned over the atmospheric environment of 55 ~ 65 DEG C by thickness, obtain the polydimethylsiloxane of leather hard;
Add hardening agent in described liquid polydimethylsiloxane, the quality proportioning of polydimethylsiloxane and hardening agent is: 10 ︰ 0.5 ~ 1.5;
Cotton and surface are covered with golden film conducting adhesive cloth elargol and are connected.
The present invention is with common textiles such as cottons for starting material, after high temperature cabonization, utilizes flexible substrate as protective seam and external packing, makes a kind of high flexibility, the wearable stress sensing elementary cell of high sensitivity and stability.The textiles such as cotton have natural periodic reticulate texture, and this is reproducible for manufacturing, and highly sensitive sensor provides advantage.Cotton, conducting adhesive cloth and polydimethylsiloxane (PDMS) all belong to flexible fabulous, the material that can bend arbitrarily, and this also provides possibility for manufacturing wearable sensor.Product has possessed that low cost, low energy consumption, preparation technology are simple, reproducible, the advantage of good stability.
Accompanying drawing explanation
Fig. 1 is the optical photograph of cotton after carbonization;
Fig. 2 is the electron micrograph of cotton after carbonization;
Fig. 3 is the structural drawing of the flexible wearable stress sensing elementary cell based on carbonization cotton;
Fig. 4 is flexible wearable stress sensing elementary cell I-V family curve under stress based on carbonization cotton and the transient response curve map of electric current;
Fig. 5 is the relative resistance change curve map of flexible wearable stress sensing elementary cell under pressure, bending and torsion based on carbonization cotton;
100 loop test curve maps that Fig. 6 is was cycle with 1 second based on the flexible wearable stress sensing elementary cell of carbonization cotton under bending;
The transient response test curve figure that Fig. 7 is was cycle with 5 seconds based on the flexible wearable stress sensing elementary cell of carbonization cotton under bending
Fig. 8 is the relaxation time test curve figure of flexible wearable stress sensing elementary cell under bending based on carbonization cotton;
Fig. 9 is the current-responsive curve map of the flexible wearable stress sensing elementary cell measurement door folding based on carbonization cotton;
Figure 10 is the current-responsive curve map of the flexible wearable stress sensing elementary cell measurement articulations digitorum manus motion based on carbonization cotton.
Embodiment
Flexible wearable stress sensing elementary cell based on carbonization cotton of the present invention, comprise the cotton layer of the carbonization being positioned at middle layer, cotton layer is gripped by two panels polydimethylsiloxane flexible substrate, there is the conducting adhesive cloth being covered with golden film as extraction electrode at the dual-side of cotton layer, be covered with the conducting adhesive cloth of golden film between two panels polydimethylsiloxane flexible substrate.Elargol is had to be connected between cotton with the conducting adhesive cloth with golden film.
The preparation method of the flexible wearable stress sensing elementary cell based on carbonization cotton of the present invention, step is as follows:
A. cotton textile is cut into required size, then being placed in temperature is calcine 25min or 30min or 35min under the ar gas environment of 600 DEG C or 650 DEG C or 700 DEG C or 750 DEG C or 800 DEG C, calcining heat is between 600 ~ 800 DEG C, calcination time, between 25 ~ 35min, obtains the cotton of carbonization;
B. the conducting adhesive cloth being covered with golden film as the two panels of extraction electrode is connected to the dual-side place of the cotton after carbonization, then cotton and the conducting adhesive cloth tiling that is covered with golden film is close in polydimethylsiloxane flexible substrate;
C. by cotton be covered with under the conducting adhesive cloth of golden film and polydimethylsiloxane flexible substrate are placed in the atmospheric environment of 60 DEG C or 65 DEG C or 70 DEG C and dry 8min or 9min or 10min or 11min or 12min, wherein temperature is between 60 ~ 70 DEG C, and the time is between 8 ~ 12min; ,
D. another sheet polydimethylsiloxane flexible substrate is close to cotton and is covered with the another side of conducting adhesive cloth of golden film, make two panels polydimethylsiloxane flexible substrate clamp cotton and be covered with the two sides of conducting adhesive cloth of golden film, forming layer structure (as shown in Figure 3);
E. layer structure entirety Step d obtained dries 8min or 9min or 10min or 11min or 12min under being placed in the atmospheric environment of 60 DEG C or 65 DEG C or 70 DEG C, wherein temperature is between 60 ~ 70 DEG C, time, must based on the flexible wearable stress sensing elementary cell of carbonization cotton between 8 ~ 12min.
Polydimethylsiloxane flexible substrate is leather hard, the polydimethylsiloxane flexible substrate preparation method of leather hard is: be dry 15min or 17min or 19min under the liquid polydimethylsiloxane of 300 μm or 350 μm or 400 μm is positioned over the atmospheric environment of 55 DEG C or 60 DEG C or 65 DEG C by thickness, obtain the polydimethylsiloxane of leather hard, wherein the thickness of liquid polydimethylsiloxane is between 300 ~ 400 μm, temperature is between 55 ~ 65 DEG C, and the time is between 15 ~ 19min.
Add hardening agent in described liquid polydimethylsiloxane, the quality proportioning of polydimethylsiloxane and hardening agent is: 10 ︰ 0.5 or 1 or 1.5, namely between 10 ︰ 0.5 ~ 1.5.Cotton and surface are covered with golden film conducting adhesive cloth elargol and are connected.
Concrete test result to product of the present invention:
The optical photograph of cotton and electron micrograph after Fig. 1,2 carbonizations, after carbonization, cotton is entwined by carbon fiber line is interlaced.This short texture porous, under stress, between carbon fiber and the Contact of carbon line can change, and then change the outward appearance resistance of whole primitive.Contact resistance change is under stress the sensor mechanism of primitive.
Fig. 3 is the structure principle chart of the flexible wearable stress sensing elementary cell based on carbonization cotton.Cotton after carbonization is clipped between the PDMS of two panels flexibility, and cotton resistance variations is under stress by two extraction electrode records.
Fig. 4 is a block size is 2 × 1mm
2the flexible wearable stress sensing elementary cell I-V family curve under stress based on carbonization cotton made of cotton and the transient response curve of electric current.In experiment test, the permanent change that cotton can bear the pressure more than 5kPa and not occur on any structure and electrology characteristic.Under pressure, the resistance of primitive reduces.The moment that pressure is removed, electric current completes transitory in 35ms.
Flexible wearable stress sensing elementary cell based on carbonization cotton all has obvious resistance variations under pressure, bending and torsion, and all available exponential type curve is described.As can be seen from Figure 5, reduce at pressure and bending lower index of resistance, the speed that resistance reduces under reversing first rises and declines afterwards, torsion angle at about 90 ° time pace of change reach maximum, change procedure can be described with two sections of exponential type curves.According to matched curve, under pressure, bending and torsion, producible maximum resistance change is respectively 26.5%, 68.9% and 39.%.Under this sensing primitive is used for there is bending applied environment, very high responsiveness will be reached.
Fig. 6 is be the cycle characteristics test curve in cycle with 1s based on the flexible wearable stress sensing elementary cell of carbonization cotton.Good stability is shown under 100 circulations.As can be seen from the transient response curve taking 5s as the cycle, there is very sharp-pointed peak response to bending fast, show high signal to noise ratio (S/N ratio).When the flexible wearable stress sensing elementary cell based on carbonization cotton gets back to original state, based on carbonization cotton flexible wearable stress sensing elementary cell resistance and non-immediate gets back to initial value, but first jump to the higher state of resistance, but relax towards original state gradually.This relaxation derives from the dislocation occurred between carbon fiber line in bending process, and carbon fiber line can relax towards the most closely and firmly state gradually afterwards, and therefore resistance reduces gradually.The time dependent relaxation process of resistance can use exponential function matching, and then can calculate the relaxation time.Can obtain mean time of relaxation from Fig. 8 is 3.43s.
Fig. 9 is the current-responsive curve of flexible wearable stress sensing elementary cell when the folding of test gate based on carbonization cotton.The noise of response curve is little, and response curve is stablized.Figure 10 is the current-responsive curve of flexible wearable stress sensing elementary cell when testing articulations digitorum manus motion based on carbonization cotton, shows very little noise equally.When the length of primitive can cover two articulations digitorum manus, can tell from response curve that to be which joint there occurs bending.
Claims (4)
1. the flexible wearable stress sensing elementary cell based on carbonization cotton, it is characterized in that: the cotton layer comprising the carbonization being positioned at middle layer, cotton layer is gripped by two panels polydimethylsiloxane flexible substrate, there is the conducting adhesive cloth being covered with golden film as extraction electrode at the dual-side of cotton layer, be covered with the conducting adhesive cloth of golden film between two panels polydimethylsiloxane flexible substrate.
2. the flexible wearable stress sensing elementary cell based on carbonization cotton according to claim 3, is characterized in that: have elargol to be connected between described cotton with the conducting adhesive cloth with golden film.
3., based on a preparation method for the flexible wearable stress sensing elementary cell of carbonization cotton, it is characterized in that: step is as follows:
A. cotton textile is cut into required size, being then placed in temperature is calcine 25 ~ 35min under the ar gas environment of 600 ~ 800 DEG C, obtains the cotton of carbonization;
B. the conducting adhesive cloth being covered with golden film as the two panels of extraction electrode is connected to the dual-side place of the cotton after carbonization, then cotton and the conducting adhesive cloth tiling that is covered with golden film is close in polydimethylsiloxane flexible substrate;
C. 8 ~ 12min is dried under cotton and the conducting adhesive cloth and polydimethylsiloxane flexible substrate that are covered with golden film being placed in the atmospheric environment of 60 ~ 70 DEG C;
D. another sheet polydimethylsiloxane flexible substrate is close to cotton and is covered with the another side of conducting adhesive cloth of golden film, make two panels polydimethylsiloxane flexible substrate clamp cotton and be covered with the two sides of conducting adhesive cloth of golden film, forming layer structure;
E. 8 ~ 12min is dried under layer structure entirety Step d obtained is placed in the atmospheric environment of 60 ~ 70 DEG C, must based on the flexible wearable stress sensing elementary cell of carbonization cotton.
4. the preparation method of the flexible wearable stress sensing elementary cell based on carbonization cotton according to claim 1, it is characterized in that: described polydimethylsiloxane flexible substrate is leather hard, the polydimethylsiloxane flexible substrate preparation method of described leather hard is: be dry 15 ~ 19min under the liquid polydimethylsiloxane of 300 ~ 400 μm is positioned over the atmospheric environment of 55 ~ 65 DEG C by thickness, obtain the polydimethylsiloxane of leather hard;
Add hardening agent in described liquid polydimethylsiloxane, the quality proportioning of polydimethylsiloxane and hardening agent is: 10 ︰ 0.5 ~ 1.5;
Cotton and surface are covered with golden film conducting adhesive cloth elargol and are connected.
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| CN201510890704.5A CN105548269B (en) | 2015-12-07 | 2015-12-07 | A kind of flexible wearable stress sensing basic unit and preparation method thereof based on carbonization cotton |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105869720A (en) * | 2016-05-25 | 2016-08-17 | 东华大学 | Elastic conducting film material and preparation method thereof |
| CN108896219A (en) * | 2018-07-06 | 2018-11-27 | 清华大学 | Flexible bionic electronic skin and preparation method thereof |
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| CN101598529A (en) * | 2008-05-19 | 2009-12-09 | 香港理工大学 | The method for preparing fabric strain sensors |
| CN202793668U (en) * | 2012-02-16 | 2013-03-13 | 安德润普科技开发（深圳）有限公司 | Flexible pressure sensor |
| CN104790224A (en) * | 2014-01-21 | 2015-07-22 | 吴江市南华纺织整理厂 | Production method of water proof and breathable fabric |
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2015
- 2015-12-07 CN CN201510890704.5A patent/CN105548269B/en active Active
Patent Citations (3)
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| CN101598529A (en) * | 2008-05-19 | 2009-12-09 | 香港理工大学 | The method for preparing fabric strain sensors |
| CN202793668U (en) * | 2012-02-16 | 2013-03-13 | 安德润普科技开发（深圳）有限公司 | Flexible pressure sensor |
| CN104790224A (en) * | 2014-01-21 | 2015-07-22 | 吴江市南华纺织整理厂 | Production method of water proof and breathable fabric |
Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105869720A (en) * | 2016-05-25 | 2016-08-17 | 东华大学 | Elastic conducting film material and preparation method thereof |
| CN108896219A (en) * | 2018-07-06 | 2018-11-27 | 清华大学 | Flexible bionic electronic skin and preparation method thereof |
| CN108896219B (en) * | 2018-07-06 | 2019-05-21 | 清华大学 | Flexible bionic electronic skin and preparation method thereof |
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| CN105548269B (en) | 2018-07-13 |
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