CN115386131B - Porous nanocomposite for self-powered self-sensing flexible electronic device and preparation method and application thereof - Google Patents
Porous nanocomposite for self-powered self-sensing flexible electronic device and preparation method and application thereof Download PDFInfo
- Publication number
- CN115386131B CN115386131B CN202210966504.3A CN202210966504A CN115386131B CN 115386131 B CN115386131 B CN 115386131B CN 202210966504 A CN202210966504 A CN 202210966504A CN 115386131 B CN115386131 B CN 115386131B
- Authority
- CN
- China
- Prior art keywords
- cnts
- granulated sugar
- self
- porous
- pdms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 72
- 239000000463 material Substances 0.000 claims abstract description 29
- 235000021552 granulated sugar Nutrition 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 10
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims abstract description 10
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims abstract description 10
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 238000000498 ball milling Methods 0.000 claims abstract description 6
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 6
- 238000001291 vacuum drying Methods 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 239000011812 mixed powder Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 7
- 125000000896 monocarboxylic acid group Chemical group 0.000 claims description 7
- 239000002048 multi walled nanotube Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- 230000005641 tunneling Effects 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 239000004642 Polyimide Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229920001721 polyimide Polymers 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013473 artificial intelligence Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000036544 posture Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 208000033830 Hot Flashes Diseases 0.000 description 1
- 206010060800 Hot flush Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000000386 athletic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
- C08J2201/042—Elimination of an organic solid phase
- C08J2201/0422—Elimination of an organic solid phase containing oxygen atoms, e.g. saccharose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention relates to a flexible material, in particular to a porous nanocomposite for a self-powered self-sensing flexible electronic device, and a preparation method and application thereof, and the porous nanocomposite comprises the following steps: weighing and ball-milling CNTs powder, mixing the CNTs powder after ball milling with granulated sugar, adding deionized water into the mixed powder, and uniformly stirring to obtain a granulated sugar-CNTs mixture; drying and molding the mixture in a mold, demolding and cooling the mixture to room temperature to obtain a granulated sugar-CNTs template; adding PDMS polymer into the mixture, and carrying out vacuum drying, curing and forming to obtain a PDMS-granulated sugar-CNTs template; carrying out ultrasonic treatment until the granulated sugar is completely dissolved to obtain a PDMS-CNTs porous structure; drying the porous nano composite material to obtain the porous nano composite material. The invention is used for preparing the piezoresistance sensor capable of generating electricity by friction, solves the defect that the flexible sensor in the prior art needs external power supply, and realizes self-energy self-sensing of the flexible sensor.
Description
Technical Field
The invention relates to a flexible material, in particular to a porous nanocomposite for a self-powered self-sensing flexible electronic device, and a preparation method and application thereof.
Background
With the rapid development of artificial intelligence and the Internet of things, the fields of industry, medical treatment, motion monitoring and the like put forward higher requirements on sensor equipment, and the requirement difference in different application fields is obvious. For example, the medical or athletic monitoring field is primarily concerned with the accuracy of data detection and ease of use of the sensor; industrial component sensors are more concerned with energy conversion efficiency, etc. The traditional sensing equipment needs to frequently replace batteries or charge, so that the convenience of use is affected, and a large number of generated scrapped batteries also pollute the environment. Wang Zhonglin the task group provides a friction nano generator for the first time, which converts tiny mechanical energy into electric energy by utilizing the coupling of friction electrification effect and electrostatic induction effect, and provides an effective way for solving the power supply problem of sensor equipment. The friction nano generator has the advantages of simple and flexible structure, low cost, light weight, high charge density and the like, and becomes one of the main research hot spots of the current microelectronic devices.
On the other hand, the rapid development of research fields such as artificial intelligence, robots, industrial automation, medical care and the like expands the demands on flexible pressure sensors, and the research hot flashes at home and abroad are raised. The flexible pressure sensor can be divided into a plurality of forms such as a capacitive type, a resistive type, a piezoelectric type and the like according to the working principle, wherein the pressure resistance sensor is most widely applied due to the simple structure and relatively low cost. However, current flexible sensors often require external power, which causes problems of increased cost, space occupation, reduced portability, etc., and cannot meet the increasing application demands.
The ability to develop self-power of flexible electronic devices is one of the effective ways to solve the above problems and is also an important development direction of flexible electronic devices.
Disclosure of Invention
The invention aims to solve the problems and provide a porous nanocomposite material for a self-powered self-sensing flexible electronic device, a preparation method and application thereof, so as to solve the defect that the flexible sensing device in the prior art needs external power supply and realize self-powered self-sensing of the flexible sensing device.
The aim of the invention is achieved by the following technical scheme:
the invention discloses a preparation method of a porous nanocomposite for a self-powered self-sensing flexible electronic device, which comprises the following steps:
s1: weighing and ball-milling CNTs powder, mixing the CNTs powder after ball milling with granulated sugar, adding deionized water into the mixed powder, and uniformly stirring to obtain a granulated sugar-CNTs mixture;
s2: drying and molding the granulated sugar-CNTs mixture obtained in the step S1 in a mold, demolding and cooling to room temperature to obtain a granulated sugar-CNTs template;
s3: adding PDMS polymer into the granulated sugar-CNTs template obtained in the step S2, and carrying out vacuum drying and curing molding to obtain the PDMS-granulated sugar-CNTs template;
s4: carrying out ultrasonic treatment on the PDMS-granulated sugar-CNTs template obtained in the step S3 until the granulated sugar is completely dissolved to obtain a PDMS-CNTs porous structure;
s5: and (3) drying the PDMS-CNTs porous structure obtained in the step (S4) to obtain the porous nanocomposite.
In the step S1, the mass ratio of CNTs powder to granulated sugar is 0.1-0.3:10; the mass volume ratio of the mixed powder to water is 30 g/1 mL. The addition amount of the carbon nanotubes can influence the electrical output performance of friction nano power generation and the resistance change curve of pressure sensing, and particularly has obvious influence on the formation of electron tunneling effect.
Preferably, the mass ratio of CNTs powder to granulated sugar is 0.2:10.
Preferably, in step S1, the CNTs powder is multi-wall MWCNT/COOH powder; the grain size of the granulated sugar is 300-500 meshes. The particle size range of the granulated sugar can influence the porosity of the finally prepared porous composite material and further influence the mechanical properties of the composite material.
Preferably, in step S2, the drying molding is performed at 80 ℃ for 30min.
Preferably, in step S3, the mass ratio of the PDMS polymer to the granulated sugar is 1:1.
Preferably, in step S3, the vacuum drying is performed for 3-4 hours at room temperature; the curing and forming time is 30min.
Preferably, in the step S4, the ultrasonic treatment is carried out in a water bath at 40 ℃ for 30min and circulated for 3-4 times. The method is characterized in that the granulated sugar in the PDMS-granulated sugar-CNTs template is removed by a template sacrificing method, the template gradually forms PDMS-CNTs with porous structures along with the removal of the granulated sugar, and pores caused by micro-force disturbance are closed, so that the device has extremely high pressure sensing sensitivity, and meanwhile, the introduced CNTs nanomaterial improves the electric output performance of friction nano power generation energy supply.
Preferably, in step S5, the drying is performed at 60 ℃ for 1h.
In a second aspect, the invention discloses a porous nanocomposite material for self-powered self-sensing flexible electronic devices, prepared by a method as described in any one of the above.
The invention discloses application of the porous nanocomposite material for the self-powered self-sensing flexible electronic device in the self-powered self-sensing flexible electronic device, the piezoresistive sensing layer and the friction nano-generator positive friction layer material.
The porous nanocomposite comprises CNTs and PDMS, and the resistance of the porous nanocomposite changes with pressure and can be used for a pressure sensing element; the device generates current under the action of circulating pressure, and can be used for friction nano power generation energy supply elements; flexible electronic devices made therefrom can be used for both pressure sensing and power generation self-energization.
Compared with the prior art, the invention has the following beneficial effects:
(1) Compared with the traditional flexible electronic device, the flexible electronic device prepared based on the invention has pressure sensing and self-energy supply capabilities, and simultaneously ensures excellent sensitivity and electric output performance.
(2) The carbon nanotubes and the porous structure form a pore guide structure, and the porous composite material shows excellent piezoresistive effect due to the closing of pores and the electron tunneling effect between adjacent carbon nanotubes in the compression process.
(3) Compared with the traditional triboelectric nano generator, the flexible electronic device based on the porous nanocomposite material has higher flexibility and air permeability, and has important application prospect in the field of human body wearable equipment.
(4) The self-powered self-sensing flexible electronic device prepared by the invention has the highest sensitivity of pressure sensing as follows: k=18.46, the electrical output characteristics of triboelectric nano-generation can be achieved: open circuit voltage V oc 110V; short-circuit current I sc 7. Mu.A.
(5) The porous nanocomposite and the self-powered sensing device thereof have the advantages of simple structure, simple preparation method, low cost, commercial practical value and great significance and application value in promoting the rapid and large-scale development of flexible electronic devices.
(6) The preparation method is simple and economical, and based on the series of materials, the flexible electronic device with the pressure self-sensing and friction nano power generation self-supply capacity can be prepared, and the device has higher pressure sensing sensitivity and electric output performance, and can promote the collaborative development of the self-sensing and self-supply fields.
Drawings
FIG. 1 is a schematic diagram of the structure of TENG produced in example 1;
FIG. 2 is a schematic illustration of a process flow for preparing a porous nanocomposite;
FIG. 3 is a physical diagram of a porous PDMS material and the porous nanocomposite obtained in example 1;
FIG. 4 is a graph showing the short circuit current of TENG prepared in example 1 under mechanical impact at different frequencies (1 Hz,2Hz,3Hz,4Hz,5 Hz);
FIG. 5 is a graph showing the comparison of short circuit currents of TENGs prepared in examples 1-3 at 5Hz mechanical impact with different CNTs content (1 wt%,2wt%,3 wt%);
FIG. 6 is a graph showing the open circuit voltage comparison of TENG at 5Hz mechanical impact at different CNTs content (1 wt%,2wt%,3 wt%) prepared in examples 1-3;
FIG. 7 is a graph comparing the pressure-deflection curves of TENGs prepared in examples 1-3 for different CNTs content (1 wt%,2wt%,3 wt%);
FIG. 8 is a graph of open circuit voltage output versus pressure (5-40N) for flexible electronic devices based on 2wt% CNTs content made in example 2;
FIG. 9 is a graph of open circuit voltage at different frequencies (1 Hz,2Hz,3Hz,4Hz,5 Hz) for mechanical impact of the flexible electronic device based on 2wt% CNTs content made in example 2;
FIG. 10 is a power plot of the flexible electronic device based on 2wt% CNTs content prepared in example 2 as a function of the connection to different external load resistances under a 5Hz mechanical impact;
FIG. 11 is a graph of electrical signal fatigue tests for 30, 150 and 2000 cycles of operation under 5Hz mechanical impact for a flexible electronic device based on a 2wt% CNTs content made in example 2;
FIG. 12 is a graph of resistance versus pressure for a flexible electronic device based on a 2wt% CNTs content made in example 2 when subjected to pressure;
FIG. 13 is a graph showing the variation of electrical signals generated by the flexible electronic device based on 2wt% CNTs content in different human body states (standing, walking, running) prepared in example 2;
FIG. 14 is a graph showing the pressure signal response of the flexible electronic device based on 2wt% CNTs content prepared in example 2 to the bending posture of the human arm;
in the figure: 1-copper electrode; 2-positive friction layer material; 3-negative friction layer material.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The following examples are only for illustrating the invention and are not intended to limit the scope of application of the invention. The manner of operation, which is not specifically noted in the examples, is generally conventional in a conventional environment.
The reagents used in the examples below, unless otherwise specified, may be selected from commercially available products that can be routinely obtained by those skilled in the art. The test methods used in the following examples may employ conventional test methods in the art, unless otherwise specified.
Example 1
A method for preparing a porous nanocomposite material for self-powered self-sensing flexible electronic devices, as shown in fig. 2, specifically comprising the following steps:
(1) Weighing 0.1g of MWCNT/COOH powder in a precision weighing balance by using weighing paper, putting the powder into a ball mill, grinding for 30min, putting the ground MWCNT/COOH powder into a beaker, adding 10g of granulated sugar with the particle size of 300-500 meshes into the beaker, and fully stirring and mixing.
(2) Measuring (0.335 mL) deionized water by a liquid transfer device, injecting into a beaker for multiple times, and fully stirring and mixing; filling the granulated sugar-MWCNT/COOH template into a silica gel grinding tool, putting the filled template into an oven, drying at 80 ℃ for 30min to form, and cooling to room temperature.
(3) Putting the formed sugar-CNTs template into a culture dish, adding 10g of prepared PDMS polymer into the culture dish, putting the whole culture dish into a vacuum drying oven, standing for 3-4h at room temperature in vacuum to enable the template filled with PDMS to be taken out, and putting the template into an oven for drying for 30min for curing and forming; and (3) carrying out ultrasonic treatment on the prepared PDMS-sugar particle-CNTs mixture in a water bath at 40 ℃ for 3-4 times until the granulated sugar particles are completely dissolved, and then putting the PDMS-CNTs porous structure subjected to ultrasonic treatment into an oven to dry for 1h at 60 ℃ to obtain the porous nanocomposite (1 wt%CNTs).
Fig. 3 shows the flexibility of pure porous PDMS (left two panels) and the PDMS-CNTs porous composite material prepared in this example (right two panels), respectively, and it can be seen that the PDMS-CNTs porous composite material has good flexibility.
Taking the PDMS-CNTs porous nano composite material prepared in the embodiment as a negative friction layer material 3 as shown in figure 1, taking a Polyimide (PI) film as a positive friction layer material 2, enabling the PI and the PDMS-CNTs porous nano composite material to be identical in size, respectively sticking copper tapes on the back sides of the PI film and the PDMS-CNTs porous nano composite material to form copper electrodes 1, respectively sticking the copper electrodes on two acrylic plates, separating the two plates by adopting springs, enabling the interval of a gap to be 10mm, and connecting the copper electrodes 1 by using copper wires to form a flexible electronic device (TENG). Under the external mechanical action, the PDMS-CNTs porous nano composite material and the PI film are in contact friction with each other, the PI film is easy to lose electrons and positively charged, and the PDMS-CNTs is easy to obtain electrons and negatively charged; when the two are separated, electrons flow through the copper wire, thereby generating a current. And then, performing contact separation power generation test of the flexible electronic device, wherein the test pressure is 5-40N, and the test frequency is 1-5Hz.
In fig. 4, the flexible electronic device is impacted at a mechanical frequency of 1-5Hz, and it can be seen that the short-circuit current exhibits an increasing trend as the mechanical impact frequency increases.
Example 2
This example differs from example 1 in that the amount of MWCNT/COOH powder is 0.2g, i.e. the CNTs in the porous nanocomposite obtained are 2 wt.%, and the other experimental steps and material amounts are the same as in example 1.
Example 3
This example differs from example 1 in that the amount of MWCNT/COOH powder is 0.3g, i.e. the CNTs in the porous nanocomposite obtained are 3wt%, and the other experimental steps and material amounts are the same as in example 1.
Fig. 5 to 7 are graphs showing the short-circuit current, open-circuit voltage and pressure-deformation curves of TENG (for the production method, see example 1) obtained in examples 1 to 3, respectively, upon self-energization. As can be seen from fig. 5, at 5Hz impact frequency, the electrical output performance of the flexible electronic device showed a trend of increasing and decreasing with increasing CNTs content; also, as can be seen from fig. 6, at an impact frequency of 5Hz, the short-circuit current of the flexible electronic device also shows a tendency of mr. Higher and then lower as the CNTs content increases. Thus, the TENG performance of the CNTs material with the content of 2wt% is higher. FIG. 7 is a pressure-deflection curve of a flexible electronic device containing carbon nanotubes in an amount of 1-3wt%, and it can be seen that the Young's modulus of the porous nanocomposite gradually increases as the CNTs content increases. The Young modulus of the flexible device containing 2wt percent of CNTs is close to that of the flexible device containing 3wt percent of CNTs, and meanwhile, the flexible device containing 2wt percent of CNTs has the highest electric output performance, so that the comprehensive performance of the flexible electronic device containing 2wt percent of CNTs can be obtained to be optimal.
Fig. 8 is a graph showing a comparison of open circuit voltages at 5N-40N impact force for a flexible electronic device (hereinafter simply referred to as the flexible electronic device of example 2) prepared from the material of example 2 (based on 2wt% cnts content), and it can be seen that as the impact force increases, the open circuit voltage of the flexible electronic device gradually increases,up to 110V at 40N impact. Fig. 9 is a graph showing the comparison of open circuit voltage output of the flexible electronic device of example 2 at different frequencies of 1-5Hz, as can be seen by the graph, the frequency increases and the open circuit voltage does not change substantially. Fig. 10 is a power diagram of the flexible electronic device of example 2 for connecting different external load resistances under a mechanical impact of 5Hz, and it can be seen from the diagram that, as the external load resistance increases, the power tends to increase first and then decrease, and the highest power can reach 139.5 μw, where the size of the flexible electronic device is: when the diameter is 30mm and the thickness is 6mm, the standard power can reach 201.85mW/m 2 . Fig. 11 is a fatigue test chart of the flexible electronic device of example 2. As can be seen from fig. 11, the voltage remains stable after 2000 cycles, and the device has better fatigue stability and can be recycled.
Fig. 12 is a graph of resistance versus pressure for the flexible electronic device of example 2 when pressure is applied. As can be seen from the figure, the forward loading curve and the reverse loading curve are well matched when the flexible electronic device is loaded and unloaded, and the change rate (R 0 -R)/R 0 And 99 percent of the total weight is achieved. This indicates that the flexible device has excellent piezoresistive properties.
Fig. 13 shows that the flexible electronic device of example 2 is embedded in the sole, and the changes of the open circuit voltage signal, the short circuit current signal and the resistance signal of the flexible electronic device under different human body movement postures (standing, walking and running) can be observed, so that the flexible electronic device has good induction to the pressure change under different human body states, and the different human body movement states can be distinguished through the strength and the change of the signals.
Fig. 14 is a verification of pressure sensing application of the flexible electronic device of example 2, and it can be seen that the ratio of resistance change of the flexible electronic device fixed to the outside and inside of the arm (elbow) gradually increases (fig. 14 b) as the bending angle of the arm increases (fig. 14 a), so that the flexible electronic device can distinguish the bending gesture of the arm, and thus can be used in the related human wearable device.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (7)
1. A method for preparing a porous nanocomposite for self-powered, self-sensing flexible electronic devices, comprising the steps of:
s1: weighing and ball-milling CNTs powder, mixing the CNTs powder after ball milling with granulated sugar, adding deionized water into the mixed powder, and uniformly stirring to obtain a granulated sugar-CNTs mixture;
s2: drying and molding the granulated sugar-CNTs mixture obtained in the step S1 in a mold, demolding and cooling to room temperature to obtain a granulated sugar-CNTs template;
s3: adding PDMS polymer into the granulated sugar-CNTs template obtained in the step S2, and carrying out vacuum drying and curing molding to obtain the PDMS-granulated sugar-CNTs template;
s4: carrying out ultrasonic treatment on the PDMS-granulated sugar-CNTs template obtained in the step S3 until the granulated sugar is completely dissolved, so as to obtain a PDMS-CNTs porous structure;
s5: drying the PDMS-CNTs porous structure obtained in the step S4 to obtain the porous nanocomposite;
in the step S1, the CNTs powder is multi-wall MWCNT/COOH powder, the grain diameter of the granulated sugar is 300-500 meshes, the mass ratio of the CNTs powder to the granulated sugar is 0.1-0.3:10, and the mass volume ratio of the mixed powder to the water is 30g:1mL; the mass ratio of the PDMS polymer to the granulated sugar is 1:1;
in the porous nano composite material, the carbon nano tube and the porous structure form a pore guide structure, and when the porous nano composite material is pressed, the porous composite material shows a piezoresistance effect due to the closing of pores and the electron tunneling effect between adjacent carbon nano tubes.
2. The method of claim 1, wherein in step S2, the drying and molding is performed at 80 ℃ for 30min.
3. The method of claim 1, wherein in step S3, the vacuum drying is performed for 3-4 hours at room temperature; the curing and forming time is 30min.
4. The method of claim 1, wherein in step S4, the ultrasound is performed in a water bath at 40 ℃ for 30min and circulated 3-4 times.
5. The method of claim 1, wherein in step S5, the drying is performed at 60 ℃ for 1h.
6. A porous nanocomposite material for self-powered self-sensing flexible electronic devices, prepared by the method of any one of claims 1-5.
7. Use of a porous nanocomposite material for self-powered self-sensing flexible electronic devices as defined in claim 6 in self-powered self-sensing flexible electronic devices, piezoresistive sensing layers and friction nano-generator positive friction layer materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210966504.3A CN115386131B (en) | 2022-08-12 | 2022-08-12 | Porous nanocomposite for self-powered self-sensing flexible electronic device and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210966504.3A CN115386131B (en) | 2022-08-12 | 2022-08-12 | Porous nanocomposite for self-powered self-sensing flexible electronic device and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115386131A CN115386131A (en) | 2022-11-25 |
| CN115386131B true CN115386131B (en) | 2024-02-27 |
Family
ID=84119344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210966504.3A Active CN115386131B (en) | 2022-08-12 | 2022-08-12 | Porous nanocomposite for self-powered self-sensing flexible electronic device and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115386131B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106601329A (en) * | 2016-08-18 | 2017-04-26 | 北京纳米能源与系统研究所 | Flexible nanometer friction generator and preparation method thereof, and prepared sensor |
| CN114479468A (en) * | 2022-01-20 | 2022-05-13 | 苏州大学 | Preparation method of CNT/PDMS flexible composite material and capacitive pressure sensor |
-
2022
- 2022-08-12 CN CN202210966504.3A patent/CN115386131B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106601329A (en) * | 2016-08-18 | 2017-04-26 | 北京纳米能源与系统研究所 | Flexible nanometer friction generator and preparation method thereof, and prepared sensor |
| CN114479468A (en) * | 2022-01-20 | 2022-05-13 | 苏州大学 | Preparation method of CNT/PDMS flexible composite material and capacitive pressure sensor |
Non-Patent Citations (1)
| Title |
|---|
| Flexible Normal-Tangential Force Sensor with Opposite Resistance Responding for Highly Sensitive Artificial Skin;Chunhong Mu et.al.;《Advanced Functional Materials》;第28卷(第18期);1-9 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115386131A (en) | 2022-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Shankaregowda et al. | Single-electrode triboelectric nanogenerator based on economical graphite coated paper for harvesting waste environmental energy | |
| Xu et al. | Wearable CNT/Ti3C2T x MXene/PDMS composite strain sensor with enhanced stability for real-time human healthcare monitoring | |
| Bhatta et al. | High-performance triboelectric nanogenerator based on MXene functionalized polyvinylidene fluoride composite nanofibers | |
| CN110146198B (en) | Flexible self-powered pressure sensor | |
| Luo et al. | Integration of micro-supercapacitors with triboelectric nanogenerators for a flexible self-charging power unit | |
| Liao et al. | Nestable arched triboelectric nanogenerator for large deflection biomechanical sensing and energy harvesting | |
| Das et al. | A laser ablated graphene-based flexible self-powered pressure sensor for human gestures and finger pulse monitoring | |
| Cheng et al. | Highly stretchable triboelectric tactile sensor for electronic skin | |
| Gao et al. | Highly sensitive strain sensors based on fragmentized carbon nanotube/polydimethylsiloxane composites | |
| Yang et al. | A flexible and wide pressure range triboelectric sensor array for real-time pressure detection and distribution mapping | |
| Huang et al. | Ultralight, elastic, hybrid aerogel for flexible/wearable piezoresistive sensor and solid–solid/gas–solid coupled triboelectric nanogenerator | |
| Wang et al. | A smart triboelectric nanogenerator with tunable rheological and electrical performance for self-powered multi-sensors | |
| Wei et al. | Self-powered hybrid flexible nanogenerator and its application in bionic micro aerial vehicles | |
| Mirfakhrai et al. | Mechanoelectrical force sensors using twisted yarns of carbon nanotubes | |
| Hao et al. | Scalable, ultra-high stretchable and conductive fiber triboelectric nanogenerator for biomechanical sensing | |
| Gokana et al. | Scalable preparation of ultrathin porous polyurethane membrane-based triboelectric nanogenerator for mechanical energy harvesting. | |
| Gao et al. | Strongly enhanced charge density via gradient nano-doping for high performance elastic-material-based triboelectric nanogenerators | |
| Yang et al. | Scalable, flexible, and hierarchical porous conductive nanocomposites for self-powered and pressure sensing dual-mode integration | |
| Zhang et al. | Preparation of a high-performance chitosan-based triboelectric nanogenerator by regulating the surface microstructure and dielectric constant | |
| Zheng et al. | Integrated nanospheres occupancy-removal and thermoforming into bulk piezoelectric and triboelectric hybrid nanogenerators with inverse opal nanostructure | |
| Dong et al. | Liquid metal@ mxene spring supports ionic gel with excellent mechanical properties for high-sensitivity wearable strain sensor | |
| Pan et al. | PVDF/AgNP/MXene composites-based near-field electrospun fiber with enhanced piezoelectric performance for self-powered wearable sensors | |
| Fu et al. | Double helix triboelectric nanogenerator for self-powered weight sensors | |
| CN115386131B (en) | Porous nanocomposite for self-powered self-sensing flexible electronic device and preparation method and application thereof | |
| Xia et al. | High sensitivity, wide range pressure sensor based on layer-by-layer self-assembled MXene/Carbon black@ Polyurethane sponge for human motion monitoring and intelligent vehicle control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |