83 results about "Piezoelectric coefficient" patented technology

The application belongs to the technical field of flexible piezoelectric materials, and discloses a grafted ferroelectric polymer thin film with a high piezoelectric coefficient and a preparation method thereof, wherein the preparation method comprises the following steps: obtaining a polymer solution by selecting a polyvinylidene fluoride-based ferroelectric polymer; adding a grafting agent reagent to the polymer solution and uniformly mixing to obtain a mixed solution; uniformly casting the mixed solution on the surface of a glass substrate, heating in an oven to volatilize the solvent, then increasing the temperature of the oven to perform a grafting reaction to obtain a grafted thin film; after the oven is naturally cooled to room temperature, the grafted thin film is peeled off from the glass substrate, and a polarization process is adopted to obtain the grafted ferroelectric polymer thin film with a high piezoelectric coefficient. The polyvinylidene fluoride-based ferroelectric polymer is modified by grafting side chains, the relative stability of different molecular conformation energies in the ferroelectric polymer is regulated by grafting side chains in the polymer, the ferroelectric phase and the relaxor phase in the ferroelectric polymer are induced to compete with each other, and the piezoelectric coefficient of the material is significantly improved.

Aspects of this disclosure relate to a bulk acoustic wave resonator having an acoustically active region and a peripheral region. The bulk acoustic wave resonator can include a first electrode, a second electrode, a piezoelectric layer positioned between the first electrode and the second electrode, and a recessed frame structure at least partially in the acoustically active region. The piezoelectric layer can have an effective piezoelectric coefficient with a lower magnitude in the peripheral region than in the acoustically active region. Other embodiments of bulk acoustic wave resonators are disclosed. Related filters, multiplexers, radio frequency modules, radio frequency systems, wireless communication devices, and methods are disclosed.

Disclosed in the present invention is a domain wall straightening method for a periodically poled ferroelectric crystal. In the present invention, by means of testing a piezoelectric coefficient of a poled sample, the poling situation of the sample can be non-destructively determined, and regions with uniform poling can be selected; moreover, whether to continue poling or terminate poling and restart poling after single-domain formation can be determined on the basis of a duty cycle calculation result; and the straightness of domain walls is determined on the basis of the variation of the piezoelectric coefficient, such that the magnitude and duration of a poling voltage are adjusted in a timely manner, thereby accurately controlling a poling process, and thus obtaining a high-quality periodically poled crystal.

Relaxation lead-based textured ceramic material with low texture temperature and high electrical performance, preparation method and application thereof relates to relaxation lead-based textured ceramic material and preparation method and application thereof. The problem of high texture temperature of low Zr content ceramic, orientation grain presenting core-shell structure, high Zr content ceramic being difficult to be textured with high quality, leading to high voltage electrical performance and low texture temperature of ceramic being unable to be acquired simultaneously is solved. Chemical formula (1-x-y) Pb (A, Nb) O3-x Pb Zr O3-y Pb Ti O3 is prepared at 850 DEG C-1095 DEG C, the texture Zr content can reach more than 50%, along [001] c The orientation degree is greater than 96%, the grain misplacement degree is less than 0.20, there is no core-shell structure, the Curie temperature is greater than or equal to 200 DEG C, the quasi-static piezoelectric coefficient is greater than 1000 pC / N, and the electromechanical coupling coefficient is greater than 0.85. The method comprises the following steps: preparing a mother body fine powder, preparing a ceramic green body by flow casting and stacking and pressing, and preparing a textured ceramic. The method is used in a multilayer piezoelectric device.

The invention relates to a hydrophobic tripeptide molecule, a crystal constructed by the hydrophobic tripeptide molecule and application of the hydrophobic tripeptide molecule in a piezoelectric device. The structural formula of the polypeptide molecule is shown as a formula (I). The polypeptide molecule can form a micron-sized crystal through a heating-cooling method, and the interior of the micron-sized crystal is of an asymmetric structure and is of a triclinic system. A crystal formed by the polypeptide molecule has a relatively high piezoelectric coefficient (21.5 pC / N), a sandwich type piezoelectric device is constructed by using the crystal, and the output voltage can reach 2.57 V, which is the highest value of an oligopeptide nano material prepared in an aqueous solution. Therefore, the invention provides a method for forming the tripeptide crystal, and provides a potential strategy for development of piezoelectric materials based on short peptide self-assembly. (I)

The invention belongs to the technical field of piezoelectric ceramics, and particularly relates to a lead antimonate niobate-lead manganese niobate-lead zirconate titanate piezoelectric ceramic material and a method. Comprising a chemical general formula of xPb (Sb1 / 3Nb2 / 3) O3 <-0.04 > Pb (Mn1 / 3Nb2 / 3) O3 <-(0.96-x) Pb < 0.98 > Sr < 0.02 > (Zr < 0.5 > Ti < 0.5 >) O3 < + y wt% Fe < 2 > O < 3 >, wherein x is equal to 0.01 to 0.08, and y is equal to 0.01 to 2. The piezoelectric ceramic material is prepared from the following raw materials: Pb3O4, TiO2, ZrO2, Nb2O5, Sb2O3, MnO2 and SrCO3. The piezoelectric ceramic has a high piezoelectric coefficient and a high electromechanical coupling coefficient at the same time, compared with traditional P-8 series piezoelectric ceramics, the energy conversion rate can be improved, and the piezoelectric ceramic has low dielectric loss and high mechanical quality factor together with P-8 and has low loss in the energy conversion process.

The invention discloses a PZT-based high-power piezoelectric ceramic and a preparation method thereof, and belongs to the technical field of piezoelectric ceramic materials. The chemical formula of the antimony manganese-lead zirconate titanate piezoelectric ceramic is 0.05 Pb (Mn < 1 / 3 > Sb < 2 / 3 >) O < 3 >-0.95 Pb < 0.97 > Sr < 0.03 > (Zr < 1 / 2 > Ti < 1 / 2 >) O < 3 + 0.1 wt% of manganese-containing oxide. By doping the manganese-containing oxide into the antimony manganese-lead zirconate titanate matrix, when the piezoelectric coefficient d33 of the prepared antimony manganese-lead zirconate titanate based piezoelectric ceramic reaches 393pC / N, the mechanical quality factor Qm can reach 1708, the electromechanical coupling coefficient is 0.630, the dielectric loss is 0.45%, the Curie temperature is 299 DEG C, and the antimony manganese-lead zirconate titanate based piezoelectric ceramic has excellent comprehensive performance.

The present application relates to a potassium sodium niobate based textured piezoelectric ceramic with high Curie temperature and temperature stability, and a preparation method thereof, the textured piezoelectric ceramic has a general chemical formula of (0.99-x)((K 0.5 Na 0.5 )(Nb 0.98 Ta 0.02 )O3)‑0.01(Bi(Ni 0.67 Nb 0.33 )O3)‑x(Bi 0.5 K 0.5 )HfO3+3wt.%NaNbO3, 0≤x≤0.04; the method comprises a solid phase synthesis method, a two-step molten salt method combined with a separation method, a template grain growth method, a casting process, a hot pressing process, a glue removal process, a two-step sintering process, a silver sintering process and a polarization process. Compared with the prior art, the present application can obtain a lead-free textured piezoelectric ceramic with high Curie temperature and high piezoelectric performance by the solid phase synthesis method, the template grain growth method combined with the casting process and the two-step sintering process, more importantly, the ceramic exhibits a single tetragonal phase structure, has high positive and inverse piezoelectric coefficients, and the piezoelectric coefficient and the inverse piezoelectric coefficient have small change rates in a wide temperature range, and has excellent temperature stability.

The present application relates to the technical field of piezoelectric thin film material, and particularly relates to a piezoelectric thin film nozzle suitable for a micro-electro-mechanical system and a preparation method thereof. The nozzle comprises a silicon substrate, a composite vibrating membrane layer, a lower electrode, a gradient lanthanum-doped lead zirconate titanate piezoelectric thin film and a ring-shaped upper electrode. The piezoelectric thin film is sequentially provided with a lanthanum-rich bottom layer, a lanthanum-transition middle layer and a lanthanum-depleted surface layer along the thickness direction. Through gradient doping, layered atmosphere heat treatment and full-film three-stage gradient crystallization annealing, residual stress is effectively released, warping deformation and micro-crack propagation are inhibited, and the piezoelectric coefficient is improved. The design of the ring-shaped upper electrode and the center reserved spray hole can stably convert the low stress advantage of the material level into the improvement of the liquid droplet spraying direction precision, volume consistency and long-term stability, thereby solving the problem that the piezoelectric thin film is prone to warping and cracking, and the spraying precision and reliability are difficult to be considered in the prior art.

The application belongs to the technical field of functional ceramics, and discloses a high-temperature piezoelectric ceramic, a preparation method thereof and a high-temperature piezoelectric device. The chemical general formula of the high-temperature piezoelectric ceramic is xBiInO3-0.2PbZrO3-(0.8-x)PbTiO3, wherein x represents a mole fraction, and the value range of x is 0.2 < x < 0.3. By introducing PbZrO3 with a perovskite structure as a third component to form a solid solution with BiInO3-PbTiO3, the tolerance factor is increased, and the key role of a structural stabilizer is played, thereby effectively solving the technical problem of the structural stability of the BI-PT system. Meanwhile, the piezoelectric ceramic has a pure perovskite phase structure, a Curie temperature greater than 550 DEG C, a piezoelectric coefficient of 56-72 pC / N, and a dielectric constant of 485-636, and is suitable for high-temperature piezoelectric devices.

Aspects of this disclosure relate to a bulk acoustic wave resonator having an acoustically active region and a peripheral region. The bulk acoustic wave resonator can include a first electrode, a second electrode, a piezoelectric layer positioned between the first electrode and the second electrode, and a recessed frame structure at least partially in the acoustically active region. The piezoelectric layer can have an effective piezoelectric coefficient with a lower magnitude in the peripheral region than in the acoustically active region. Other embodiments of bulk acoustic wave resonators are disclosed. Related filters, multiplexers, radio frequency modules, radio frequency systems, wireless communication devices, and methods are disclosed.

The invention relates to the field of geophysical logging, and discloses an optical fiber sensing sound wave detector supporting multidirectional detection based on an elastic rod body and a detection device. An optical fiber sensing sound wave detector supporting multidirectional detection based on an elastic rod body comprises the elastic rod body and a plurality of optical fibers. Wherein a plurality of through holes are formed in the elastic rod body in the axis direction of the elastic rod body, the number of the through holes is the same as that of the optical fibers, and the through holes are formed in the periphery of the axis of the elastic rod body in an equal central angle mode; each optical fiber penetrates through a through hole formed in the axis direction of the elastic rod body and extends into the elastic rod body, and each through hole allows one optical fiber to penetrate through. The distributed optical fibers are used for receiving acoustic signals, the defect that the piezoelectric coefficient and the energy conversion efficiency of a traditional piezoelectric crystal are reduced in a high-temperature environment due to the fact that the traditional piezoelectric crystal is influenced by the Curie temperature of a ceramic material is overcome, and the problem that the amplitude of a receiver is saturated due to high-energy emission can also be avoided.

The application discloses a screening method and device of piezoelectric anisotropic perovskite material, and high-throughput calculation and screening are performed on tetragonal phase ABO3 perovskite oxide material through first principle calculation, the correlation between piezoelectricity and lattice tetragonality, polarization displacement, spontaneous polarization and elastic constant is pointed out, and the method can be used for screening and guiding design of high-performance piezoelectric material. The application gives a three-dimensional representation of piezoelectric coefficient, re-evaluates the piezoelectric coefficient ratio |d 33 / d 31 | which is widely used at present, and points out the deficiency in representing piezoelectric anisotropy, and can be extended to anisotropy of other piezoelectric materials.

This invention relates to the field of piezoelectric materials technology, specifically to a chiral nitrogen-containing heterocyclic organic crystalline piezoelectric material and its preparation method. The organic crystalline piezoelectric material is N-cyanoethyl-( S )-2-methylpiperazine hydrochloride, whose core is a one-dimensional hydrogen-bonded chain construction strategy of unilaterally protonated chiral piperazine, with protonated N-cyanoethyl-( S Using 2-methylpiperazine cations as structural building blocks and chloride ions as charge balancers, a highly oriented one-dimensional hydrogen bond chain is constructed by regulating intermolecular hydrogen bonding. This enhances the ordered arrangement of molecular dipoles and optimizes the synergistic mode of lattice strain-polarization response, achieving a breakthrough in piezoelectric properties. The material exhibits a piezoelectric coefficient as high as ±80 pC / N and an electromechanical coupling coefficient as high as 0.35, far exceeding known chiral organic piezoelectric materials. Furthermore, it demonstrates excellent thermal stability and can be widely applied in demanding applications such as micro-pressure sensors, low-frequency vibration detectors, and micro energy harvesters.

The invention provides a multi-mode coupling acoustic resonator, a filter and radio frequency equipment, and relates to the technical field of acoustic resonators. According to the multi-mode coupling acoustic wave resonator, the material of a piezoelectric layer is selected, and the value range of an in-plane Euler angle is set, so that piezoelectric coefficients of the piezoelectric layer comprise an e11 component, an e13 component and an e34 component in a piezoelectric coefficient matrix; by designing the ratio of the thickness of the piezoelectric layer to the periodic wavelength of the interdigital electrode, a transverse electric field and a longitudinal electric field exist in the piezoelectric layer at the same time when voltage is applied to the interdigital electrode; and by designing the ratio of the thickness of the interdigital electrode to the thickness of the piezoelectric layer, the integral of the dot product of the electric field and the alternating stress field in the piezoelectric layer in the thickness direction of the piezoelectric layer is not zero, so that the transverse electric field and the longitudinal electric field excite a multi-mode coupling acoustic wave at the same time, and the multi-mode coupling acoustic wave resonator has the advantages of ultrahigh working frequency, low cost and the like. And the material has a large electromechanical coupling coefficient, and can meet the large bandwidth requirement of centimeter wave communication frequency bands.

The invention discloses an acousto-optic modulator based on heterogeneous integration of PZT and chalcogenide glass, and belongs to the technical field of integrated photoelectronics. The modulator sequentially comprises a silicon substrate, a silicon dioxide lower cladding layer and a lead zirconate titanate (PZT) piezoelectric film layer from bottom to top, a chalcogenide glass optical waveguide is heterogeneously integrated on the PZT layer, and the optical waveguide is patterned into a Mach-Zehnder interferometer (MZI) structure. An interdigital transducer (IDT) made of aluminum (Al) is arranged between two arms of the MZI, and air grooves which extend to a lower cladding layer or a substrate are etched in the outer sides of the two arms respectively. The advantage of high piezoelectric coefficient of PZT and the advantage of high photoelasticity of chalcogenide glass are combined through heterogeneous integration. Aluminum is used as an IDT electrode material, so that the mass loading effect of the electrode on the surface acoustic wave is effectively reduced; acoustic resonant cavities are constructed through air grooves in the outer sides of the two arms, sound wave energy is limited in an optical waveguide area, and the acousto-optic interaction is remarkably enhanced. The structure realizes optical signal modulation with low driving voltage, low loss and high efficiency, and is suitable for an integrated optical path system of intermediate infrared and communication wavebands.

The invention provides a layered ferroelectric material piezoelectric response measurement method and device capable of eliminating static artifacts, and relates to the technical field of advanced functional material characterization and testing. According to the specific implementation scheme, a CuxInyP2S6 single crystal is synthesized by adopting a chemical vapor transport method; a Raman spectrum and an energy dispersive spectrometer are used for testing, and whether a sample composition is a CuInP2S6-In4 / 3P2S6 bulk heterostructure or not is verified; if the verification result is yes, the influence of the CuInP2S6-In4 / 3P2S6 ferroelectric domain characterization result under the action of the static artifact is obtained through a PFM test; using a static blind spot method to counteract static artifacts, and performing comparative analysis to obtain a real amplitude value of a CuInP2S6-In4 / 3P2S6 surface ferroelectric domain; and corresponding data are extracted for calculation, so that the piezoelectric coefficient of CuInP2S6-In4 / 3P2S6 is obtained. By optimizing a bias voltage and laser positioning strategy, the interference of electrostatic interaction on a measurement signal is effectively eliminated.

The application relates to the technical field of piezoelectric materials, and discloses application of a kind of half Heusler alloy as piezoelectric material, the half Heusler alloy is of chemical formula XYZ, wherein X is any one of Ti, Zr, Hf, V, Nb, Ta, Re or solid solution in any proportion, Y is Fe or Co or Ni, and Z is Sn or Sb or Bi.The inventor finds that the above-mentioned half Heusler alloy can exhibit excellent piezoelectric performance, wherein a [111] cut type wafer of ZrNiSn single crystal material can obtain a piezoelectric coefficient of 22 pC / N at 300 K.The half Heusler alloy has good thermal stability and structural stability in the temperature range from room temperature to 1173 K, and has great high-temperature piezoelectric application potential.A piezoelectric sensor prepared based on the above-mentioned half Heusler alloy can obtain a voltage response of the order of sub-mV under the normal pressing force of a human body, and can be used for the development of electronic devices such as piezoelectric sensors, piezoelectric vibration energy collectors and piezoelectric self-powered systems.

The invention discloses an ultrasonic endoscope transducer based on a lead-free piezoelectric ceramic material as well as a preparation method and application of the ultrasonic endoscope transducer. The ultrasonic transducer comprises an acoustic backing layer, a lead-free piezoelectric layer, an acoustic matching layer and a coaxial wire, the lead-free piezoelectric layer is made of lead-free piezoelectric ceramic or a lead-free piezoelectric ceramic composite material; according to the method, the matching layer is prepared by adopting a spin-coating method, so that the method has huge advantages in preparation of a micron-sized matching layer, and a new way is provided for preparation of the matching layer of the high-frequency ultrasonic transducer. A gradient matching material is used as an acoustic matching layer, and materials with low, medium and high acoustic impedances are prepared as the gradient acoustic matching layer, so that the sensitivity and the bandwidth can be effectively improved, and the performance of the transducer is improved; the lead-free piezoelectric ceramic and the lead-free piezoelectric ceramic composite material used for preparing the piezoelectric layer of the ultrasonic transducer have the advantages of being thin in thickness, high in dielectric constant, high in piezoelectric coefficient and the like, the amplitude is high, the sensitivity is high, the relative bandwidth is large, and the imaging effect of an ultrasonic endoscope system is greatly improved.

This invention discloses a method for preparing a stretchable piezoelectric composite material. The method includes: (1) preparing a piezoelectric ceramic framework structure using a co-foaming-high-temperature sintering process; (2) coating the framework structure with a polymer composite dielectric layer to form a composite ceramic framework structure; and (3) filling the composite ceramic framework structure with silicone rubber to form a stretchable piezoelectric composite material. The piezoelectric composite material prepared by this invention has a high piezoelectric coefficient, with a positive piezoelectric coefficient reaching 110 pC N. ‑1 The above electrostrain can reach 200 pm V. ‑1 The above. It has extremely low acoustic impedance, less than 4Mrayl. It has 10pm. 2 N ‑1 It exhibits high hydrostatic pressure sensitivity. It also possesses excellent mechanical properties, with a tensile elongation at break exceeding 30%. Simultaneously, its piezoelectric performance remains essentially stable under uniaxial tensile strain up to 20%, showing no significant attenuation after multiple cycles. When used as a sound wave receiver, it can achieve a relative bandwidth exceeding 40% and high pulse output amplitude at -6dB without the need for an acoustic matching layer.

This invention relates to the field of composite piezoelectric materials, and more particularly to a polyacrylonitrile fiber composite piezoelectric material and its preparation method. The preparation method provided by this invention first utilizes a coating method to prepare a composite fiber membrane. The interfacial interaction—microphase synergy effect—formed by the coating between the EP matrix and the piezoelectric active layer effectively suppresses the random entanglement and thermal relaxation of the molecular chains in the piezoelectric active layer. Subsequently, corona polarization is used to induce the molecular chains of the piezoelectric active layer to oriented along the electric field direction, which can significantly increase the proportion of the planar serrated conformation of the piezoelectric active layer. This preparation method has strong process compatibility, controllable preparation cost, and is suitable for large-scale industrial production. The prepared composite piezoelectric material does not require complex multilayer structures or additional doping modifications to achieve directional improvement and long-term stability of the piezoelectric coefficient, and has excellent reusability, which is expected to meet the needs of diverse application scenarios.

The invention relates to the technical field of clothes treatment equipment, and provides a double-phase active substance generating device and clothes treatment equipment. The double-phase active substance generating device comprises a shell, a separator is arranged in the shell, and an inner cavity of the shell is divided into a gas ionization cavity and a liquid ionization cavity by the separator; an electrode structure is arranged in the gas ionization cavity and is used for generating a gas-phase active substance when being electrified; a piezoelectric material layer is arranged on one side surface, facing the liquid ionization cavity, of the separator, and the piezoelectric material layer is used for being activated to generate voltage to generate a liquid-phase active substance when the electrode structure is electrified; the piezoelectric coefficient of the piezoelectric material layer is larger than or equal to 360 pC / N. According to the double-phase active substance generating device, the piezoelectric material layer with the piezoelectric coefficient larger than or equal to 360 pC / N can be activated to generate the voltage by electrifying the electrode structure, and therefore the gas-phase active substance and the liquid-phase active substance can be generated at the same time, and the purposes of sterilization and peculiar smell removal are achieved.

The present disclosure provides a conductive indium tin oxide (ITO) film with piezoelectric properties, method for preparing the same, and capacitors using the same. The piezoelectric coefficient of the conductive ITO film with piezoelectric properties is greater than 3 pm / V, and the resistance value thereof is less than 10Ω. The present disclosure confers both piezoelectric and conductive properties to ITO by doping metal elements into ITO via a low-temperature hydrothermal method.

A system and method for determining a piezoelectric property of a piezoelectric material are disclosed. The system includes a voltage source configured to apply a first voltage across the piezoelectric material during a first time period. A mass sensor is operatively coupled to the material to measure an apparent mass thereof, and a capacitance meter is configured to measure a capacitance of the material during the same time period. A processor, communicatively coupled to the mass sensor and the capacitance meter, is configured to calculate a first value indicative of a piezoelectric property, such as a piezoelectric coefficient (d33 or d31), based at least in part on the measured apparent mass and the measured capacitance. By utilizing these concurrent measurements, the system can determine an effective thickness of the material under an applied electric field, circumventing prior art assumptions and enabling a more direct and physically accurate characterization.

The invention discloses a piezoelectric enhanced poly-L-lactic acid fiber membrane and a preparation method thereof, and belongs to the technical field of biomedical materials.The preparation method of the piezoelectric enhanced poly-L-lactic acid fiber membrane comprises the following steps that the poly-L-lactic acid fiber membrane prepared through electrostatic spinning is provided; enabling the poly-L-lactic acid fiber membrane to be in contact with a metal substrate, and performing heat treatment to enable the fiber membrane to be crystallized under the interface induction of the metal substrate, thereby obtaining the piezoelectric enhanced poly-L-lactic acid fiber membrane with the metastable-state alpha'crystal form. According to the preparation method, the interface induction effect of the metal substrate is creatively utilized, the crystal structure of the PLLA is successfully converted from an alpha crystal form with low net polarization intensity to an alpha'crystal form with high net polarization intensity in the heat treatment process, and the intrinsic piezoelectricity of the material is fundamentally improved. The piezoelectric coefficient of the prepared fiber membrane is remarkably improved, and a stronger electric signal can be generated under mild external mechanical stimulation.

To provide a fluorine-based resin piezoelectric film having a low shrinkage factor during heating and high transparency.SOLUTION: A fluororesin piezoelectric film having a maximum shrinkage of 2.5% or less when held at 80 °C for 30 minutes, a retardation of 50nm or more and 3000nm or less, an internal haze of less than 1.2%, and a piezoelectric coefficient d33 of 5. 0pC / N or more and 40. 0pC / N or less.SELECTED DRAWING: None

The invention discloses a cerium-chromium-doped sodium bismuth titanate-based high-temperature piezoelectric ceramic material and a preparation method thereof, and belongs to the technical field of high-temperature piezoelectric ceramic materials. The general formula of the high-temperature piezoelectric ceramic is (Na < 0.5 > Bi < 0.5 >) < 1-x > Ce < x > Bi < 4 > Ti < 4-y > CryO < 15 >, wherein x is more than or equal to 0.00 and less than or equal to 0.02; and y is greater than 0.00 and less than or equal to 0.04. The cerium chromium / chromium-sodium bismuth titanate-based high-temperature piezoelectric ceramic obtained by doping chromium or cerium chromium into the sodium bismuth titanate-based piezoelectric ceramic not only can reach a relatively high Curie temperature, but also has excellent piezoelectric property, the piezoelectric coefficient d33 of the cerium chromium / chromium-sodium bismuth titanate-based high-temperature piezoelectric ceramic can reach 30.7 pC / N, the Curie temperature is 668 DEG C, and the dielectric constant at room temperature is 127.

The application discloses a piezoelectric hydrogel performance optimization method based on deep learning, and relates to the technical field of material preparation, which comprises the following steps: preparing a hydrogel precursor solution of a bifunctional monomer, adding a crosslinking agent N,N'-methylene bisacrylamide and stirring and dissolving to obtain a uniform transparent solution; injecting the uniform transparent solution into a polytetrafluoroethylene mold, controlling the wet film thickness by adopting a doctor blade coating method, and performing ultraviolet initiation polymerization to form a gel thin film; cutting the gel thin film into samples, measuring initial piezoelectric coefficients, dielectric constants and dielectric loss factors, and obtaining initial performance data. Through the innovative combination of the adversarial network and the reinforcement learning technology, the application constructs a complete piezoelectric hydrogel intelligent optimization system, the adversarial network dynamic polarization control step utilizes the physical constraint adversarial training to generate an asymmetric triangular wave polarization scheme, and the accurate matching between the polarization parameters and the material dynamic response is realized.

The present application relates to a kind of micromechanical ultrasonic transducer structures and its manufacturing method, the micromechanical ultrasonic transducer structure includes PMUT unit, including PMUT bearing layer and the first PMUT and second PMUT of PMUT bearing layer, each PMUT includes first electrode layer, second electrode layer and piezoelectric layer, wherein: the piezoelectric coefficient of the piezoelectric layer of first PMUT is higher than the piezoelectric coefficient of the piezoelectric layer of second PMUT, and the dielectric constant of the piezoelectric layer of first PMUT is lower than the dielectric constant of the piezoelectric layer of second PMUT.Further, first PMUT and second PMUT are respectively arranged on the two sides of PMUT bearing layer.The present application also relates to an electronic device comprising the above-mentioned micromechanical ultrasonic transducer structure.