CN112825286A - Capacitor and preparation method thereof - Google Patents

Capacitor and preparation method thereof Download PDF

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Publication number
CN112825286A
CN112825286A CN201911152619.3A CN201911152619A CN112825286A CN 112825286 A CN112825286 A CN 112825286A CN 201911152619 A CN201911152619 A CN 201911152619A CN 112825286 A CN112825286 A CN 112825286A
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China
Prior art keywords
electrode
capacitor
substrate
thin film
film
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CN201911152619.3A
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Chinese (zh)
Inventor
娄正
沈国震
冉文浩
赵淑芳
王得鹏
尹瑞阳
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Institute of Semiconductors of CAS
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Institute of Semiconductors of CAS
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Priority to CN201911152619.3A priority Critical patent/CN112825286A/en
Publication of CN112825286A publication Critical patent/CN112825286A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00Fixed capacitors; Processes of their manufacture
    • H01G4/33Thin- or thick-film capacitors 
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G13/00Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G13/00Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
    • H01G13/003Apparatus or processes for encapsulating capacitors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00Fixed capacitors; Processes of their manufacture
    • H01G4/002Details
    • H01G4/224Housing; Encapsulation

Abstract

The present invention provides a capacitor, comprising: a substrate (1) on which a first electrode (2), a second electrode (3) and a thin film (4) are formed; the thin film (4) comprises two parts of thin films which are respectively connected with the first electrode (2) and the second electrode (3), the two parts of thin films form a pair of interdigital electrodes (5), electrolyte (6) is filled between the pair of interdigital electrodes (5), and the electrolyte (6) is in contact with the substrate (1); the capacitor can simulate the nerve synapse, and is further applied to the field of artificial intelligence.

Description

Capacitor and preparation method thereof
Technical Field
The invention relates to the fields of flexible electronic devices, micro capacitors and bionics, in particular to a capacitor and a preparation method thereof.
Background
With the rapid development of the information field, people expect that the way of processing information in the future can perform autonomous learning and thinking like the brain, so that the artificial neural network is constructed by using electronic devices, and the abstract simulation of the artificial neural network from the information processing point of view becomes a hot point for the research of a new generation of computer systems. The neurosynaptic is a site where functional connection between neurons in the brain occurs, its own plasticity is considered as a basis for biological learning and memory, and the function of the simulated synapse is considered as a key step in constructing an artificial neural network. The traditional method of combining a plurality of transistors and capacitors is a feasible scheme for constructing the artificial neural network, but the application of the scheme is limited due to the complex preparation process and high energy consumption of devices.
In the field of simulated nerve synapses, discrete devices of artificial synapse units developed at present, including two-terminal device atom switches, memristors, ion/electron hybrid transistors, ferroelectric transistors and three-terminal nerve morphors, all require external power sources as energy sources, so that the environment is not environment-friendly enough. Meanwhile, as the demand of people for wearable electronics is higher and higher, the devices are prepared from rigid substrates, so that the prepared devices have low applicability.
The neuromorphic device and the system based on the double electric layer transistor realize the functions of exciting post-emergent current and double-pulse facilitation of biological synapses, and although the functions can realize short-time facilitation and double-pulse facilitation, the device cannot be widely applied to wearable electronic equipment due to the rigid substrate of a single device.
Disclosure of Invention
Technical problem to be solved
The invention provides a capacitor and a preparation method thereof, which are at least used for solving the problems of complex preparation process, high energy consumption of devices and non-wearing.
(II) technical scheme
The present invention provides a capacitor, comprising: a substrate 1 on which a first electrode 2, a second electrode 3 and a thin film 4 are formed; the thin film 4 comprises two parts of thin films which are respectively connected with the first electrode 2 and the second electrode 3, the two parts of thin films form a pair of interdigital electrodes 5, electrolyte 6 is filled between the pair of interdigital electrodes 5, and the electrolyte 6 is in contact with the substrate 1.
Alternatively, the distance range between the interdigital electrodes 5 is greater than 0 and equal to or less than 0.2 mm.
Optionally, the film 4 is a graphene film.
Optionally, the substrate 1 is a flexible substrate that is bendable.
Optionally, the first electrode 2 and the second electrode 3 are flexible stretchable electrodes, and the flexible stretchable electrodes are at least one of silver nanowires, carbon tubes, and graphene.
Optionally, the electrolyte 6 is a lithium chlorate solution.
A device comprises a plurality of capacitors which are interconnected by first and second electrodes 2, 3.
A method of making a capacitor comprising: s1, preparing a thin film 4 on the substrate 1, and preparing an interdigital electrode 5 on the thin film 4; s2, filling electrolyte 6 between the interdigital electrodes 5, and packaging the film 4; s3, the first electrode 2 and the second electrode 3 are formed at opposite edges of the film 4, resulting in a capacitor.
Alternatively, in step S1, the preparing the thin film 4 on the substrate 1 includes: and spin-coating the mixed solution of polyvinylidene fluoride, graphene and N, N-dimethylformamide on the substrate 6, and heating to form the film 4.
Alternatively, in step S3, preparing the first electrode 2 and the second electrode 3 outside the two opposite edges of the thin film 4 includes: the flexible stretchable material is added to a mixed solution of triblock copolymers of styrene, toluene and isoprene, and then spin-coated on opposite edges of the thin film 4.
(III) advantageous effects
1. The interdigital electrodes and the electrolyte between the interdigital electrodes have high inosculation degree with biological nerve synapse behaviors, can simulate nerve synapses, and is further applied to the field of artificial intelligence;
2. the electrode material of the interdigital electrode comprises graphene microchip, and can be applied to the fields of automobiles, standby power supplies, renewable energy sources and uninterrupted energy sources;
3. the super capacitor provided by the invention has the advantages of simple structure and easiness in preparation, and the flexible substrate is used, so that the super capacitor provided by the invention has the characteristic of being flexible and is suitable for industrial production;
4. the length range of the super capacitor provided by the invention is 30-40mm, the width range is 15-20mm, and the single capacitors can be connected through the conducting wire to form the super capacitor array, so that the super capacitor array can be applied to complex sensitive, non-empirical and empirical learning functions.
Drawings
Fig. 1 schematically shows a structural view of a capacitor provided by an embodiment of the present invention;
FIG. 2 is a flow chart schematically illustrating a method for fabricating a capacitor according to an embodiment of the present invention;
FIG. 3 schematically illustrates a neural activity output graph provided by an embodiment of the present invention;
FIG. 4 is a graph schematically illustrating the variation of output voltage with stimulation current provided by an embodiment of the present invention;
FIG. 5 is a graph schematically illustrating output voltage as a function of stimulation time, provided by an embodiment of the present invention;
FIG. 6 schematically illustrates a graph of capacitor double pulse facilitation over time provided by an embodiment of the present invention;
FIG. 7 is a graph schematically illustrating the change in the two-pulse facilitation index of a capacitor over time provided by an embodiment of the present invention;
fig. 8 schematically shows a relationship among the frequency characteristic, the output voltage, and time of the capacitor provided by the embodiment of the present invention.
Description of reference numerals: 1-a substrate; 2-a first electrode; 3-a second electrode; 4-a film; 5-interdigital electrodes; 6-electrolyte.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Referring to fig. 1, fig. 1 schematically illustrates a structure of a capacitor provided in an embodiment of the present invention; the capacitor includes: a substrate 1 on which a first electrode 2, a second electrode 3 and a thin film 4 are formed; the thin film 4 includes two portions of thin films, one of which is denoted by 41 and the other of which is denoted by 42, in this embodiment, the thin film 41 is a negative electrode, the thin film 42 is a positive electrode, the thin film 41 and the thin film 42 are respectively connected to the first electrode 2 and the second electrode 3, the two portions of thin films form a pair of interdigital electrodes 5, an electrolyte 6 is filled between the pair of interdigital electrodes 5, and the electrolyte 6 is in contact with the substrate 1. Wherein, the distance range between the interdigital electrodes 5 is more than 0 and less than 0.2mm, and the smaller the distance is, the higher the capacitance of the capacitor is.
In this embodiment, the substrate 1 is a flexible substrate, and the flexible substrate may be, for example, Polyethylene terephthalate (PET), Polyimide (PI), Polydimethylsiloxane (PDMS), or a Polyurethane (PU), and the specific material is not limited in particular.
In this embodiment, the film 4 is a graphene film, and the graphene film has an advantage of good conductivity when used as a capacitor material.
Electrolyte 6 is lithium chlorate electrolyte in this embodiment, and above-mentioned lithium chlorate electrolyte has the advantage that chemical property is stable, the electric capacity is high.
In this embodiment, the first electrode 2 and the second electrode 3 are flexible stretchable electrodes, the flexible stretchable electrodes are made of at least one of silver nanowires, carbon tubes and graphene, the flexible stretchable electrodes have a length ranging from 5mm to 10mm, a width ranging from 5mm to 10mm and a thickness ranging from 0.1mm to 0.5mm, and the electrodes of the flexible stretchable electrodes may be circular or n-sided, where n is greater than or equal to 3.
In this embodiment, the substrate length of the capacitor is 30mm to 40mm, and the substrate width is 15mm to 20 mm.
The embodiment of the invention also provides a device, the device comprises a plurality of capacitors, the plurality of capacitors are connected with each other through the first electrode 2 and the second electrode 3, an m × n device array can be manufactured, the first electrode 2 and the second electrode 3 can be connected through a lead, for example, and the formed device can realize complex joint learning functions such as sensitivity, non-empirical mode, empirical mode and the like.
The embodiment of the present invention further provides a method for manufacturing a capacitor, and referring to fig. 2, fig. 2 schematically illustrates a flowchart of a method for manufacturing a capacitor according to the embodiment of the present invention, where the method includes:
s1, preparing a thin film 4 on the substrate 1, and preparing the interdigital electrode 5 on the thin film 4.
Wherein the above-mentioned preparing the thin film 4 on the substrate 1 comprises: firstly, respectively ultrasonically cleaning a substrate 1 by using acetone, ethanol or water to obtain a cleaned substrate 1;
then, 0.15g of graphene microchip and 6ml of N, N-Dimethylformamide (DMF) are mixed and subjected to ultrasonic treatment to obtain a mixed solution 1;
next, 0.1g of polyvinylidene fluoride (- (CH)2-CF2)nPVDF) is added into the mixed solution A, mixed solution B is obtained after stirring, the mixed solution B is dripped onto the substrate 1, and the substrate 1 is heated for 2 hours at the temperature of 100 ℃ to obtain a film 4;
finally, the interdigital electrode 5 is produced on the thin film 4 using a laser marking machine.
In this embodiment, the mass of the graphene nanoplatelets, the volume of DMF, the mass of PVDF, the stirring time, the heating temperature, and the heating time are not particularly limited.
And S2, filling electrolyte 6 between the interdigital electrodes 5 and packaging the film 4.
Adding 3g of polyvinyl alcohol (PVA) into 20ml of deionized water, and then carrying out oil bath for 1 hour at the heating temperature of 95 ℃ to obtain a PVA solution; preparing 10ml of 2mol/ml lithium chlorate solution, and dropwise adding the lithium chlorate solution into the PVA solution to obtain electrolyte 6;
and dripping an electrolyte 6 between the interdigital electrodes 5, contacting the electrolyte 6 with the substrate 1, and packaging the film 4.
In this example, the PVA quality, the volume of deionized water, the oil bath temperature, the oil bath time, and the concentration and volume of the lithium chlorate solution are not particularly limited.
S3, the first electrode 2 and the second electrode 3 are formed at opposite edges of the film 4, resulting in a capacitor.
After the flexible stretchable material is added into a mixed solution of triblock copolymer consisting of styrene, toluene and isoprene, the mixture is coated on two opposite edges of the thin film 4 in a spin coating mode, the mixed solution formed by the flexible stretchable material is contacted with the interdigital electrodes 5, and the first electrode 2 and the second electrode 3 are formed after the mixed solution formed by the flexible stretchable material is dried, so that the capacitor is obtained.
For the dimensional parameters and material types of the structures in the preparation method, reference is made to the above-mentioned structural embodiments, which are not described herein again.
Referring to fig. 3, fig. 3 schematically illustrates a neural activity output graph provided by an embodiment of the present invention. After a pulse signal is given to the capacitor at a certain moment, the output voltage of the capacitor is rapidly increased in a very short time range and then is reduced along with the time, and the reduction process is that the output voltage is rapidly reduced in a very short time firstly and is converted into a gentle reduction after a certain output voltage value is reached. FIG. 3 is a graph showing the time characteristics of a capacitor according to an embodiment of the present invention, which can verify that the capacitor according to an embodiment of the present invention has the characteristics of a neurosynaptic signal. Referring to fig. 4, fig. 4 is a graph schematically illustrating the variation of the output voltage with the stimulation current according to the embodiment of the present invention. When the stimulus current is 0, the output voltage of the capacitor in the embodiment of the present invention also shows 0, and after the intensity of the stimulus current is gradually increased, the intensity of the output voltage is also gradually increased, so that when an external stimulus current is applied to the capacitor in the embodiment, an output voltage value uniquely corresponding to the external stimulus current can be obtained.
Referring to fig. 5, fig. 5 is a graph schematically illustrating the variation of the output voltage with stimulation time according to the embodiment of the present invention. As can be seen from fig. 5, at the initial time, the capacitor in this embodiment has a specific voltage value, and when the stimulation time is gradually increased, the output voltage of the capacitor is gradually increased, but the rate of the increase of the output voltage of the capacitor along with the stimulation time is gradually decreased along with the increase of the stimulation time.
Referring to fig. 6, fig. 6 schematically illustrates a graph of capacitor double pulse facilitation over time, as provided by an embodiment of the present invention. When the capacitor in this embodiment is stimulated with double pulses, two peaks of output voltage varying with stimulation time are obtained, and the second peak increases by a larger magnitude than the first peak, which reflects the fact that the capacitor in this embodiment has a double-pulse facilitation (PPF) characteristic of synapses, with an intermediate neuron function and a pre-synaptic action mechanism in patch-clamp reactions.
Referring to fig. 7, fig. 7 is a graph schematically illustrating the change of the two-pulse facilitation index of the capacitor over time according to an embodiment of the present invention. As the stimulation time was increased, the PPF index decreased, indicating that the link between successive stimulation pulses decreased as the stimulation time increased.
Referring to fig. 8, fig. 8 schematically illustrates a relationship diagram between the frequency characteristic, the output voltage and the time of the capacitor provided by the embodiment of the present invention. As the stimulation time increases, the magnitude of the increase in output voltage is greater as the stimulation frequency increases, indicating that the magnitude of the increase in stimulation intensity corresponding to the output voltage is also greater.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A capacitor, comprising:
a substrate (1) on which a first electrode (2), a second electrode (3) and a thin film (4) are formed;
the thin film (4) comprises two parts of thin films which are respectively connected with the first electrode (2) and the second electrode (3), a pair of interdigital electrodes (5) are formed by the two parts of thin films, electrolyte (6) is filled between the pair of interdigital electrodes (5), and the electrolyte (6) is in contact with the substrate (1).
2. Capacitor according to claim 1, wherein the distance between the interdigitated electrodes (5) ranges not more than 0.2 mm.
3. Capacitor according to claim 1, wherein the film (4) is a graphene film.
4. The capacitor according to claim 1, wherein the substrate (1) is a bendable flexible substrate.
5. The capacitor according to claim 1, wherein the first electrode (2), the second electrode (3) are flexible stretchable electrodes, the flexible stretchable electrodes being at least one of silver nanowires, carbon tubes and graphene.
6. The capacitor according to claim 1, wherein the electrolyte (6) is a lithium chlorate solution.
7. A device comprising a plurality of capacitors as claimed in any one of claims 1 to 6, which are interconnected by means of the first electrode (2) and the second electrode (3).
8. A method of making a capacitor comprising:
s1, preparing a thin film (4) on a substrate (1), and preparing interdigital electrodes (5) on the thin film (4);
s2, filling electrolyte (6) between the interdigital electrodes (5) and encapsulating the thin film (4);
s3, preparing a first electrode (2) and a second electrode (3) at two opposite edges of the film (4) to obtain the capacitor.
9. The method of claim 8, wherein the step S1 of preparing the thin film (4) on the substrate (1) comprises:
and spin-coating a mixed solution of polyvinylidene fluoride, graphene and N, N-dimethylformamide on a substrate (6), and heating to form the film (4).
10. The method according to claim 8, wherein the preparing of the first electrode (2) and the second electrode (3) at two opposite edges of the thin film (4) in step S3 comprises:
the flexible stretchable material is added into a mixed solution of triblock copolymer consisting of styrene, toluene and isoprene, and then is coated on two opposite edges of the film (4) in a spinning mode.
CN201911152619.3A 2019-11-20 2019-11-20 Capacitor and preparation method thereof Pending CN112825286A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104211047A (en) * 2013-05-30 2014-12-17 纳米新能源(唐山)有限责任公司 Graphene, graphene electrode, graphene supercapacitor and preparation method thereof
CN107221447A (en) * 2017-07-03 2017-09-29 中国科学院宁波材料技术与工程研究所 A kind of graphene flexible compound electrode, its preparation method and flexible super capacitor
US20180082796A1 (en) * 2015-05-20 2018-03-22 Deutsches Zentrum für Luft- und Raumfahrt e.V. Supercapacitors with oriented carbon nanotubes and method of producing them
CN109841426A (en) * 2019-01-21 2019-06-04 宁波石墨烯创新中心有限公司 Graphene-based flexible electrode and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104211047A (en) * 2013-05-30 2014-12-17 纳米新能源(唐山)有限责任公司 Graphene, graphene electrode, graphene supercapacitor and preparation method thereof
US20180082796A1 (en) * 2015-05-20 2018-03-22 Deutsches Zentrum für Luft- und Raumfahrt e.V. Supercapacitors with oriented carbon nanotubes and method of producing them
CN107221447A (en) * 2017-07-03 2017-09-29 中国科学院宁波材料技术与工程研究所 A kind of graphene flexible compound electrode, its preparation method and flexible super capacitor
CN109841426A (en) * 2019-01-21 2019-06-04 宁波石墨烯创新中心有限公司 Graphene-based flexible electrode and preparation method thereof

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Application publication date: 20210521