CN102983270A - Polymer function device - Google Patents
Polymer function device Download PDFInfo
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- CN102983270A CN102983270A CN2012104727389A CN201210472738A CN102983270A CN 102983270 A CN102983270 A CN 102983270A CN 2012104727389 A CN2012104727389 A CN 2012104727389A CN 201210472738 A CN201210472738 A CN 201210472738A CN 102983270 A CN102983270 A CN 102983270A
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Abstract
The invention discloses a polymer function device which comprises a first electrode layer, a first piezoelectric layer, a first transition layer, an ion exchange enhancement layer, a second transition layer, a second piezoelectric layer and a second electrode layer, wherein the first electrode layer, the first piezoelectric layer, the first transition layer, the ion exchange enhancement layer, the second transition layer, the second piezoelectric layer and the second electrode layer are stacked sequentially. The first electrode layer and the second electrode layer have different work functions. The ion exchange enhancement layer comprises ion exchange enhancement materials and nanometer conductive particles. The first transition layer and the second transition layer are polytrifluorohloroethylene, polytetrafluoroethylene or polyvinyl alcohol. A novel piezoelectric polymer material is used for forming the piezoelectric layer, and the electrostriction strain is increased by 5-7% compared with that of piezoelectric elements of common piezoelectric polymers in the prior art.
Description
Technical field
The present invention relates to a kind of function element.
Background technology
Function element obtains the increasing research of people and uses.Piezoelectric element is as a kind of common function device, and it is converted to the element of the signal of telecommunication, the electrode layer that it comprises piezoelectric material layer and is positioned at these piezoelectric material layer both sides with pressure.When exerting pressure on this piezoelectric element surface, can detect corresponding signal of telecommunication output at this two electrode layer.This piezoelectric material layer is made by the material with piezoelectric effect, and piezoelectric comparatively commonly used in the prior art is piezoelectric ceramic, such as barium titanate, lead titanates and pick lead titanates etc., and piezopolymer, such as Kynoar (PVDF) etc.
Kynoar and copolymer thereof are as modal organic piezopolymer.Because they have good pliability and easily make large-area film, thereby have important application prospect in audio frequency and sonac, biomedical transducer, electromechanical transducer and pyroelectricity and optics.But its actuation capability is low, and under the 150MV/m electric field, its Electrostrictive strain only is 7%.Therefore, this area researcher wishes to find the piezopolymer that can replace Kynoar that improves Electrostrictive strain, improves the performance of piezoelectric device.
Summary of the invention
The invention discloses a kind of polymers function device, it comprises the first electrode layer, the first piezoelectric layer, the First Transition layer that stacks gradually, ion-exchange enhancement layer, the second transition zone, the second piezoelectric layer and the second electrode lay, wherein,
The first electrode layer has different work functions from the second electrode lay, and the ion-exchange enhancement layer comprises ion-exchange reinforcing material and conductive nano particle; The ion-exchange reinforcing material is polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol, and the conductive nano particle is carbon nano-tube, Graphene or metal nanoparticle; First Transition layer and the second transition zone are polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol;
Piezoelectric layer is formed by piezopolymer and binding agent mixing;
This piezopolymer is for having the material of chemical structural formula (I);
Wherein
N and m respectively are the integer greater than 1;
P is 0 or greater than 1 integer;
X and Z be the C for being substituted or being unsubstituted respectively
4-C
60Aromatic series unit or aliphat unit;
Y is the C that is substituted or is unsubstituted
2-C
40The aliphat unit; With
G
1, G
2, G
3And G
4Respectively be the C that is substituted or is unsubstituted
1-C
12Fatty group.
The invention has the beneficial effects as follows: the polymeric piezoelectric material with novelty forms piezoelectric layer, has prepared novel piezoelectric element.This piezoelectric element is mutually stacked by metal and piezopolymer with different work functions, does the time spent when being under pressure, and this piezoelectric layer has different Schottky contacts from the first electrode layer and the second electrode lay, thereby produces electrical potential difference.The Electrostrictive strain ratio of this piezoelectric element is with the piezoelectric element raising 5～7% of Kynoar as piezopolymer.
Description of drawings
Fig. 1 is the structural representation of polymers function device of the present invention.
Embodiment
In order to make those skilled in the art more clearly understand technical scheme of the present invention, describe polymers function device of the present invention and manufacture method thereof in detail below with reference to accompanying drawing.
As shown in Figure 1, polymers function device of the present invention comprises the first electrode layer 1, the first piezoelectric layer 2, First Transition layer 3, ion-exchange enhancement layer 4, the second transition zone 5, the second piezoelectric layer 6 and the second electrode lay 7 that stacks gradually.Ion-exchange enhancement layer 4 is arranged between First Transition layer 3 and the second transition zone 5, First Transition layer 3, the first piezoelectric layer 2 and the first electrode layer 1 from inside to outside successively from a surface of ion-exchange enhancement layer 4, be the second transition zone 5, the second piezoelectric layer 6 and the second electrode lay 7 from inside to outside successively from another surface of ion-exchange enhancement layer 4, form seven laminatings and close the stacked structure that arranges.
The material of the first piezoelectric layer 2 and the second piezoelectric layer 6 includes the have chemical structural formula material of (I);
N and m respectively are the integer greater than 1;
P is 0 or greater than 1 integer;
X and Z be the C for being substituted or being unsubstituted respectively
4-C
60Aromatic series unit or aliphat unit;
Y is the C that is substituted or is unsubstituted
2-C
40The aliphat unit; And G
1, G
2, G
3And G
4Respectively be the C that is substituted or is unsubstituted
1-C
12Fatty group.
Preferably, n and m respectively are 5 to 600 integer, and more preferably n and m respectively are 10 to 300 integer.
Preferably, p is 0 or 1 to 300 integer, and more preferably p is 5 to 150 integer.
Preferably, X and Z respectively are the C that is substituted or is unsubstituted
6-C
40Aromatic series unit or aliphat unit.
Preferably, Y is the C that is substituted or is unsubstituted
3-C
20The aliphat unit; Preferably, Y is the C that is substituted or is unsubstituted
4-C
12Hydrocarbon chain or C
4-C
12The dioxygen alkyl, more preferably, Y is the dioxygen butyl.
Preferably, G
1, G
2, G
3And G
4Respectively be the C that is substituted or is unsubstituted
1-C
6Fatty group, the methyl that more preferably is substituted or is unsubstituted, ethyl, propyl group, butyl, methoxyl group, ethyoxyl or propoxyl group, more preferably methyl.
The first piezoelectric layer 2 and the second piezoelectric layer 6 can also comprise a small amount of binding agent, so that piezoelectric layer better combines with electrode layer and ion-exchange enhancement layer and moulding.This polymeric piezoelectric material accounts for more than 90% of piezoelectric layer 2 gross masses, is preferably more than 95%.
In one embodiment, this piezoelectric layer 2 comprises and accounts for total weight than 97% polymeric piezoelectric material, and accounts for total weight than 3% binding agent.
In one embodiment, this binding agent is PAN.The thickness of this piezoelectric polymer layer 2 is 10～300 microns, is preferably 100～200 microns.In one embodiment, the thickness of this piezoelectric polymer layer 2 is about 150 microns.
Ion-exchange enhancement layer 4 is to adopt the ion-exchange reinforcing material to get the solution curing molding to make, and it is evenly to add the conductive nano particle in the ion-exchange reinforcing material that ion-exchange strengthens solution;
The ion-exchange reinforcing material is preferably polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol.The conductive nano particle is carbon nano-tube, Graphene or metal nanoparticle.
First Transition layer 3 and the second transition zone 5 are polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol.Its thickness is preferably 15～20 microns.
The work function of metal that forms the first electrode layer 1 is unequal with the work function of the metal that forms the second electrode lay 5.Preferably, the work function difference of the metal of the work function of the metal of the first electrode layer 1 and the second electrode lay 5 is larger, preferably differs more than the 0.5eV.The first electrode layer 1 with different work functions and the second electrode lay 5 and the first piezoelectric layer 2 and the second piezoelectric layer 4 are mutually stacked, do the time spent when being under pressure, the inner separation of charge that produces of piezoelectric layer, because this polymeric piezoelectric material has different Schottky contacts from the metal of different work functions, thereby produce electrical potential difference and electric current.The first electrode layer 1 is larger with the work function difference of the metal of the second electrode lay 5, and the electrical potential difference that then produces is larger.Owing between the first piezoelectric layer 2 and the second piezoelectric layer 4, be provided with ion-exchange enhancement layer 3, can significantly improve electrical potential difference and electric current.
Preferably, the first electrode layer 1 can be aluminium/copper (Al/Cu), the combination of aluminium/nickel (Al/Ni), aluminium/gold (Al/Au), zinc/gold (Zn/Au) with the material of the second electrode lay 3.In one embodiment, the material of the first electrode layer 1 is Al, and its work function 4.28eV, the material of the second electrode lay 3 are Au, its work function 5.1eV.
The first electrode layer 1 and the second electrode lay 3 can be tinsel or metallic film, or are respectively tinsel and metallic film.This tinsel can with these piezoelectric polymer layer 2 phase pressings, this metallic film can be by electroplating or the method such as deposition directly be formed at the surface of this piezoelectric polymer layer 2.The thickness of this tinsel is preferably 200～1000 microns.The thickness of this metallic film is preferably 10～200 microns.In one embodiment, the first electrode layer 1 and the second electrode lay 3 are the tinsel that thickness is about 0.5 millimeter.
First embodiment of the invention provides a kind of polymers function device, the manufacture method of polymer piezo element especially, and it may further comprise the steps:
The first, prepare polymeric piezoelectric material, and this polymeric piezoelectric material was heated 1 hour to 5 hours at 160～190 ℃, make its decomposes.Preferably, heating-up temperature is 180 ℃, and be 3 hours heating time.
The second, this piezopolymer and binding agent and volatile solvent are formed a slurry.This piezopolymer mixes as 90: 10 to 99: 1 ratio take mass ratio with this binding agent, is preferably 97: 3.This volatile solvent makes this slurry have certain flowability, is easy to film.This volatile solvent can be ethanol, methyl alcohol or acetone and other organic solvent.In the present embodiment, with 9.7 these piezopolymers of gram and 0.3 gram acrylonitrile, and add 10 milliliters of dimethyl formamides, in mortar, fully mix.
The 3rd, this slurry is coated on the first electrode layer 1 surface, form the first piezoelectric layer 2.The thickness of this piezoelectric layer 2 is preferably 10～300 microns.In the present embodiment, can use scraper that described slurry is coated on aluminium foil surface, the thickness of formed the first piezoelectric layer 2 is about 150 microns.
The 4th, dry this first piezoelectric layer 2 makes solvent evaporates.Particularly, the first electrode layer 1 can be positioned over heat drying in the baking oven together with this first piezoelectric layer 2.The temperature of this baking oven can be 40 ℃～80 ℃, and can be 2～5 hours drying time.In the present embodiment, baking temperature is 50 ℃, and be 4 hours drying time.
The 5th, at the first piezoelectric layer 2 surface-coated First Transition layers 3, the material of First Transition layer 3 is polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol.Particularly, after being mixed with solution, polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol be coated in the first piezoelectric layer 2 surfaces, drying.
The 6th, at these the first piezoelectric layer 2 surface-coated ion-exchange enhancement layers 4.The method of preparation ion-exchange enhancement layer is: with ion-exchange reinforcing material and solvent, solvent is preferably ethanol or water, obtaining to mass percent concentration is 25～50% ion-exchange reinforcing material solution, the bubble in the solution is removed in ultrasonic concussion, the conductive nano particle is added in the solution, the shared mass percent of conductive nano particle that wherein adds is preferably 6～10%, ultrasonic concussion is uniformly dispersed and obtains ion-exchange enhancing solution, and wherein the ultrasonic concussion time is preferably 200～500 minutes.
Seven, the material at ion-exchange enhancement layer 4 surface-coated the second transition zone 5, the second transition zones 5 is polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol.Particularly, after being mixed with solution, polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol be coated in ion-exchange enhancement layer 4 surfaces, drying.
The 8th, the slurry that mixes in the above-mentioned second step is coated on the second transition zone 5 surfaces, form the second piezoelectric layer 6.The thickness of this second piezoelectric layer 6 is preferably 10～300 microns.In the present embodiment, can use scraper that described slurry is coated on aluminium foil surface, the thickness of formed the second piezoelectric layer 6 is about 150 microns.
The 9th, dry this second piezoelectric layer 6 makes solvent evaporates.Particularly, above-mentioned laminated construction can be positioned over heat drying in the baking oven.The temperature of this baking oven can be 40 ℃～80 ℃, and can be 2～5 hours drying time.In the present embodiment, baking temperature is 50 ℃, and be 4 hours drying time.
The tenth, the second electrode lay 7 is covered in this second piezoelectric layer 6 surfaces and is laminated.In the present embodiment, the second electrode lay 7 is goldleaf.Particularly, after the second electrode lay 7 can being covered these the second piezoelectric layer 6 surfaces, use roll that the first electrode layer 1, the first piezoelectric layer 2, First Transition layer 3, ion-exchange enhancement layer 4, the second transition zone 5, the second piezoelectric layer 6 and the second electrode lay 7 are fitted tightly.
The piezoelectric element that will form by the method for the first embodiment accesses the piezoelectric effect of this piezoelectric element of test in the loop, and wherein, the load resistance R in this loop is 4.0 * 10
6Ohm (Ω), the size of this piezoelectric element is 20 * 20 millimeters.When the pressure that is subject to when this piezoelectric element surface increased in time gradually, the magnitude of voltage that can record this load resistance R two ends constantly increased, and concrete data are as shown in table 1.After this pressure continued for some time, this magnitude of voltage descended very slowly, and sustainable reaching more than a few hours.When pressure increased or reduces, this voltage changed rapidly with the variation of pressure.When being respectively 4,000 Ns and 60,000 Ns when being under pressure, the power output of this piezoelectric element is 0.9nW and 8nw.
Table 1
This device is mutually stacked by metal and piezoelectric polymer layer with different work functions, do the time spent when being under pressure, the inner separation of charge that produces of this piezopolymer because it has different Schottky contacts from the metal of different work functions, thereby produces electrical potential difference and electric current.Through measuring, the Electrostrictive strain of this piezoelectric element ratio is with the piezoelectric element raising 5～7% of Kynoar as piezopolymer.
Polymer piezo device of the present invention can be used for sonac, biomedical transducer and transducer etc., is having broad application prospects aspect machinery, medical treatment, the completion.
Be appreciated that; only be the preferred embodiments of the present invention; can not limit scope of the invention process with this; those skilled in the art in spirit of the present invention can to its make various modification or; the variation that these are done according to spirit of the present invention all should be included in the present invention's scope required for protection.
Claims (10)
1. a polymers function device is characterized in that, described polymers function device comprises the first electrode layer, the first piezoelectric layer, the First Transition layer that stacks gradually, ion-exchange enhancement layer, the second transition zone, the second piezoelectric layer and the second electrode lay, wherein,
The first electrode layer has different work functions from the second electrode lay, and the ion-exchange enhancement layer comprises ion-exchange reinforcing material and conductive nano particle; The ion-exchange reinforcing material is polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol, and the conductive nano particle is carbon nano-tube, Graphene or metal nanoparticle; First Transition layer and the second transition zone are polytrifluorochloroethylene, polytetrafluoroethylene or polyvinyl alcohol;
Piezoelectric layer is formed by piezopolymer and binding agent mixing;
This piezopolymer is for having the material of chemical structural formula (I);
Wherein
N and m respectively are the integer greater than 1;
P is 0 or greater than 1 integer;
X and Z be the C for being substituted or being unsubstituted respectively
4-C
60Aromatic series unit or aliphat unit;
Y is the C that is substituted or is unsubstituted
2-C
40The aliphat unit; With
G
1, G
2, G
3And G
4Respectively be the C that is substituted or is unsubstituted
1-C
12Fatty group.
2. piezoelectric element as claimed in claim 1 is characterized in that, n and m respectively are 5 to 600 integer.
3. polymers function device as claimed in claim 1 or 2 is characterized in that, n and m respectively are 10 to 300 integer.
4. polymers function device as claimed in claim 1 is characterized in that, p is 0 or 1 to 300 integer.
5. such as claim 1 or 4 described polymers function devices, it is characterized in that p is 5 to 150 integer.
6. polymers function device as claimed in claim 1 is characterized in that, X and Z be the C for being substituted or being unsubstituted respectively
6-C
40Aromatic series unit or aliphat unit.
7. such as claim 1 or 6 described polymers function devices, it is characterized in that X and Z are the C that is substituted or is unsubstituted
4-C
12Hydrocarbon chain or C
4-C
12The dioxygen alkyl.
8. polymers function device as claimed in claim 1 is characterized in that, Y is the dioxygen butyl.
9. polymers function device as claimed in claim 1 is characterized in that G
1, G
2, G
3And G
4Respectively be the C that is substituted or is unsubstituted
1-C
6Fatty group.
10. such as claim 1 or 9 described polymers function devices, it is characterized in that G
1, G
2, G
3And G
4Respectively be methyl, ethyl, propyl group, butyl, methoxyl group, ethyoxyl or the propoxyl group that is substituted or is unsubstituted.
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| CN201210472738.9A CN102983270B (en) | 2012-11-20 | 2012-11-20 | Polymer function device |
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| CN113597192A (en) * | 2020-04-30 | 2021-11-02 | 维沃移动通信有限公司 | Electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063035A (en) * | 2006-04-29 | 2007-10-31 | 长兴化学工业股份有限公司 | Organic luminescent material and usage thereof |
| JP2010165770A (en) * | 2009-01-14 | 2010-07-29 | Konica Minolta Medical & Graphic Inc | Organic piezoelectric element, organic piezoelectric material, ultrasonic vibrator and ultrasonic probe |
| US20110021918A1 (en) * | 2008-08-11 | 2011-01-27 | Konica Minolta Medical & Graphic Inc. | Organic piezoelectric material film, method for production of organic piezoelectric material film, method for production of ultrasonic oscillator, and ultrasonic medical imaging instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063035A (en) * | 2006-04-29 | 2007-10-31 | 长兴化学工业股份有限公司 | Organic luminescent material and usage thereof |
| US20110021918A1 (en) * | 2008-08-11 | 2011-01-27 | Konica Minolta Medical & Graphic Inc. | Organic piezoelectric material film, method for production of organic piezoelectric material film, method for production of ultrasonic oscillator, and ultrasonic medical imaging instrument |
| JP2010165770A (en) * | 2009-01-14 | 2010-07-29 | Konica Minolta Medical & Graphic Inc | Organic piezoelectric element, organic piezoelectric material, ultrasonic vibrator and ultrasonic probe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113597192A (en) * | 2020-04-30 | 2021-11-02 | 维沃移动通信有限公司 | Electronic equipment |
| CN113597192B (en) * | 2020-04-30 | 2024-02-02 | 维沃移动通信有限公司 | Electronic equipment |
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