747 results about "Nanogenerator" patented technology

The invention discloses a self-powered multifunctional wireless sensing system based on a wind energy friction nano-generator, which comprises a self-powered module, the self-powered module is provided with the wind energy friction nano-generator capable of generating alternating current, and the self-powered module comprises a supporting seat and a friction power generation assembly fixedly assembled on the supporting seat; the friction power generation assembly comprises a wind energy rotating mechanism, an FEP film sleeve layer, a first power generation copper electrode set and a second power generation copper electrode set, the first power generation copper electrode set and the second power generation copper electrode set are fixedly attached to the outer side of the fixing cylinder, and the FEP film sleeve layer is connected to the outer side of the first power generation copper electrode set and the outer side of the second power generation copper electrode set in a sleeving mode. The wind energy rotating mechanism is connected to the outer side of the FEP film sleeve layer in a sliding and sleeving mode. Two copper foil sheets are arranged in the wind energy rotating mechanism; the wireless sensing module is electrically connected with the first power generation copper electrode group, and the wired energy supply module is electrically connected with the second power generation copper electrode group. The friction nanometer generator can supply power to the wireless unit and the wired unit at the same time, and the utilization efficiency of the friction nanometer generator on wind energy is improved.

According to the TENG-based self-powered sensing system and the sleep wake-up method thereof provided by the invention, through cooperation of the composite nano generator and the low-power-consumption Internet of Things technology, energy can be effectively collected in an all-weather manner, and acceleration data can be collected; the composite nanometer generator is formed by compactly combining a contact separation type friction nanometer generator and a solar cell, the space utilization rate is improved, and sunlight and mechanical vibration are used as energy sources. The friction nanometer generator is designed in a spring supporting mode, so that the durability is improved; the signal conditioning circuit is divided into two parts, one part is used for collecting and storing energy so as to realize self power supply; the other part is used for transmitting information carried by vibration so as to realize wake-up triggering of the low-power-consumption acceleration sensor; the system can realize self-powered and all-weather vibration monitoring, can be gradually applied to the fields of bridge health monitoring, air conditioner fan monitoring, iron tower monitoring and the like, and lays a solid foundation for realizing an IOT-based digital building technology in the future.

The invention discloses a friction nano-generator capable of collecting fluid energy, a preparation method of the friction nano-generator and application of the friction nano-generator in heavy metal ion removal, and belongs to the technical field of nano-generators. The invention discloses a fluid energy collection friction nano-generator. The fluid energy collection friction nano-generator comprises a base, a plurality of supporting plates, stress turbine blades, a rotating shaft, a contact separation assembly and a sliding friction assembly. Through structural innovation and optimization, high voltage is realized by using a contact separation mode, and meanwhile, high current output is realized by considering an independent layer mode. The composite structure design improves the adaptability of the system, so that the system can keep efficient energy conversion in various working environments, and the limitation of unbalanced voltage and current output in the traditional design is overcome. The composite design not only breaks through the power bottleneck of the traditional TENG, but also provides a new idea for efficient energy capture in a more complex mechanical environment. Compared with the prior art, the electric output performance and the device operation are greatly improved.

A friction nanometer generator disclosed by the present invention comprises a collection unit, a conversion unit and an output unit, the collection unit comprises an input shaft and a base, the conversion unit comprises a roller and a fixed cylinder, the outer wall surface of the roller and the inner wall surface of the fixed cylinder are both provided with friction materials, and the polarities of the friction materials of the roller and the fixed cylinder are opposite; the output unit comprises an energy storage electrode layer and an output electrode layer. The input shaft drives the roller to rotate, the roller and the inner wall of the fixed cylinder rub and roll, and friction materials of the roller and the fixed cylinder have opposite polarities and rub to generate electric energy; the generated electric energy is injected into the energy storage electrode layer, the energy storage electrode layer transmits energy to the output electrode layer through electrostatic induction, and the output electrode layer generates current output. Friction resistance and material abrasion are reduced in a rolling contact mode, the energy storage electrode layer and the output electrode layer of the output unit are of a non-contact structure, a large number of charges are generated due to electrostatic induction, an efficient electric energy output system is formed, and the charge density and the output performance of the friction nanometer generator are effectively improved.

The present technology relates to an electroporation based antimicrobial apparatus The electroporation based antimicrobial apparatus includes a negative electrode and a positive electrode powered by an energy source, operatively coupled to an air inlet structure, such that upon applying 10 an external electric field across the negative electrode and the positive electrode, a lightning-rod effect is generated that causes permanent damage to outer structure of microbes passing along with air through the air inlet structure, thus achieving instant disinfection. The energy source includes a 15 respiration driven triboelectric Nanogenerator (R-TENG) for harvesting wasted biomechanical energy from the periodic motion of respiration. The R-TENG includes a pair of nanofiber films comprising a first nanofiber film composed of a tribopositive material and a second nanofiber film 20 composed of a tribonegative material. The tribopositive and tribonegative materials are with opposite polarity and the R-TENG serves as a filtration system concurrently. Most illustrative diagram:

The invention relates to the technical field of nano-generators, in particular to a triboelectric material of nano-porous composite fibers and a preparation method and application of the triboelectric material of the nano-porous composite fibers, and the preparation method comprises the following steps: adding polyvinylidene fluoride and perfluoroethylene propylene copolymer nanoparticles into a mixed solvent of N, N-dimethylacetamide / acetone; uniformly mixing to obtain a polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion; and carrying out electrostatic spinning on the polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion to obtain the triboelectric material. The triboelectric material prepared through the method is a high-charge-density super-hydrophobic nano-generator material based on electrostatic spinning, the electrostatic spinning porous composite fiber material is used as a friction medium layer, high surface charge, hydrophobicity and fouling resistance are achieved, and the performance of a flexible solid-liquid interface nano-generator is improved.

A tactile sensor comprising flexible electrodes and triboelectric layers is provided. The first triboelectric layer is disposed on the first flexible electrode. The second triboelectric layer is disposed on the second flexible electrode. The first and second triboelectric layers cover a same area. The first and second triboelectric layers are located between the first and second flexible electrodes. The second triboelectric layer keeps a distance from the first triboelectric layer when no external force is applied. The first triboelectric layer comprises MXene and polyvinylidene fluoride (PVDF). The first triboelectric layer and the second triboelectric layer have different triboelectric properties and form a triboelectric nanogenerator. A touch device comprising the tactile sensor and a manufacturing method of the tactile sensor are also provided.

The floatable instantaneous generator comprises an outer layer in the form of a hemispherical floatable supporting bowl and an inner layer in the form of a liquid-solid triboelectric nano generator (ls TENG); the inner layer includes a fluorinated ethylene propylene (FEP) layer on an inner side of the bowl, a ring electrode on an upper surface of the FEP layer around a periphery thereof, a circular electrode on a bottom surface at a central portion of the FEP layer, and a droplet slidable on the upper surface of the FEP layer. When subjected to open sea waves, the bowl floats and tilts the ls TENG so as to slide droplets on the upper surface of the FEP, thereby creating and disconnecting contact between the ring electrode and the circular electrode and providing power to an electrical circuit connected between the ring electrode and the circular electrode.

The invention relates to the technical field of medical apparatus and instruments, in particular to an intelligent suture line with electrical stimulation and drug release synergism and a preparation method thereof. The preparation method of the intelligent suture line with synergistic electrical stimulation and drug release comprises the following steps: fully dissolving a high polymer in an organic solvent to obtain a high polymer solution; and mixing the conductive polymer nanoparticles, a stabilizer, a dopant and a micromolecular anti-inflammatory drug to obtain conductive polymer coated drug particles. Uniformly mixing with a high polymer solution to obtain an electrostatic spinning precursor solution; the electrostatic spinning precursor solution and a metal wire are prepared through an electrostatic spinning machine, and then the intelligent suture line is prepared. The prepared intelligent suture line generates inductive charges or alternating current under external stimulation based on a single-electrode mode of a friction nano-generator, realizes control of release of small-molecule drugs and also can generate an alternating electric field to realize electrical stimulation treatment, and can promote rapid healing of wounds under the mutual synergistic effect of the inductive charges and the alternating electric field.

The invention discloses a composite hydrophobic fiber membrane based on a friction nano-generator and a preparation method of the composite hydrophobic fiber membrane. The composite hydrophobic fiber membrane is composed of a polyvinylidene fluoride nanofiber membrane, boracite particles, hydrophobic nanoparticles and polyvinylidene fluoride microspheres. The boracite particles are embedded in fibers of the polyvinylidene fluoride nanofiber membrane, and the hydrophobic nanoparticles are uniformly attached to the polyvinylidene fluoride microspheres and the polyvinylidene fluoride nanofiber; the hydrophobic nano particles are titanium dioxide nano particles or zirconium dioxide nano particles. The preparation method comprises the following steps: dispersing boracite powder and polyvinylidene fluoride powder into N, N-dimethylformamide to prepare an electrostatic spinning solution; the preparation method comprises the following steps: dispersing hydrophobic nanoparticles and polyvinylidene fluoride powder into N, N-dimethylformamide to prepare an electrostatic spraying solution; the composite hydrophobic fiber membrane is prepared through synchronous electrostatic spinning and electrostatic spraying. The problem that a modified polyvinylidene fluoride fiber membrane friction nanometer generator is low in output electrical performance in a high-humidity environment can be solved.

The invention provides structures and synthesis of a class of piezoelectric monomers and COFs with fluorine-substituted side chains tethered on the peripheral position of an aromatic moiety (thus different functional side chains). The multi-fluoro groups on the mentioned piezoelectric COFs provide abundant piezoelectric active sites, which enable the application as the active layer for PENGs. The exemplary embodiments also provide a process for the fabrication of a piezoelectric COF and a process for the fabrication of the piezoelectric nanogenerator utilizing mentioned piezoelectric COF.

The invention belongs to the technical field of new energy materials, and discloses an N-site alcoholic hydroxyl spiropyrane, a polyionic liquid material, a flexible stretchable nano-generator and a preparation method, and the polyionic liquid material is prepared based on copolymerization of the provided novel N-site alcoholic hydroxyl spiropyrane and ionic liquid; the polyion liquid material can be used for preparing a flexible and stretchable nano generator; the stretchability of the nano-generator is realized, the output electrical performance of the nano-generator can be effectively adjusted by adjusting the stretch rate, and the nano-generator can be applied to the fields of intelligent flexible wearable equipment, health detection and the like and has a huge application prospect.

The invention is suitable for the technical field of ocean power generation, and provides a friction nano-generator for collecting low-frequency wave energy and a power generation method thereof. According to the invention, the electrode distribution in the friction nanometer generator (TENG) is optimized, and the flowing direction of the current is fixed, so that the design of a power management circuit is simplified. Meanwhile, TENG aims at reducing friction loss, a friction structure adopts a solid-solid contact separation mode, and a solid-solid sliding mode is not adopted. In addition, according to the buoy using the device, rolling balls are distributed in a packaging shell module of the buoy to trigger an array composed of TENG to work, and all-directional collection of sea wave energy is achieved.

The invention relates to the technical field of vibration energy collection, in particular to a multi-mode composite friction nano-generator based on magnetic bistability. Comprising a rectangular shell, a rectangular sliding part is arranged in the rectangular shell, a vertical connecting plate body is arranged in the middle of the top of the interior of the rectangular shell and extends downwards into the rectangular sliding part, and an elastic reset assembly and a magnetic bistable mechanism are jointly arranged on the vertical connecting plate and the rectangular sliding part; contact separation type friction nanometer power generation units are arranged on the front end face and the rear end face of the rectangular sliding part and the corresponding inner wall face of the rectangular shell. Grid type sliding friction nanometer power generation units are arranged on the left side end face, the right side end face and the lower bottom face of the rectangular sliding part and the corresponding inner wall face of the rectangular shell. According to the invention, two modes of friction nano-generators and a magnetic bistable mechanism are integrated, so that the conversion efficiency of mechanical energy is remarkably improved; the defect of narrow frequency band of a traditional linear generator is overcome.

The invention provides a magnetic polymer composite film and a preparation method and application thereof, and belongs to the technical field of friction materials. The magnetic polymer composite membrane comprises a P (VDF-TrFE) base membrane and a plurality of rod-shaped CoFe2O4 (RCFO) (at) PDA magnetic nano particles dispersed in the P (VDF-TrFE) base membrane, the RCFO (at) PDA magnetic nanoparticle has a core-shell structure, a core layer is rod-like nanometer CoFe2O4, and a shell layer is polydopamine. The RCFO nanoparticles with dielectric properties are embedded into the P (VDF-TrFE) base film, and a stripe-shaped surface microstructure is successfully constructed through a magnetic field orientation assisted thermal film forming process, so that the contact area of the friction material is effectively increased, and meanwhile, the dielectric constant is also improved. The magnetic polymer composite film provided by the invention is used as a positive electrode friction material of a friction nanometer generator, and the electric output performance of the friction nanometer generator is obviously improved.

The invention provides a multi-stage siphon water level sensing device based on a friction nanometer generator, and aims to overcome the defect that an existing TENG water level sensing device is easily interfered by the environment. The device performs graded monitoring on the water level through a multi-stage siphon structure, and the higher the water level is, the more the triggered siphons are, so that the variable electric signal frequency is generated, and the water level height is accurately reflected. The siphon unit is composed of siphons arranged in an array mode, and each siphon is provided with a water inlet pipe, a water outlet pipe and an exhaust pipe. Through arrangement of a siphon starting position, different water level heights correspond to starting of different siphons. The outlet flow of the siphon unit is converged to the water turbine, the water turbine works through the TENG to generate an electric signal, and the frequency is related to the water level height. The device has the advantages of efficient energy collection, self-driving, durability and reliability, and can bring a major breakthrough to the field of water level monitoring.

The invention belongs to the technical field of generators, and particularly relates to a hybrid nano generator and a power management circuit thereof, comprising a shell, and an electromagnetic power generation unit, a friction power generation unit and a piezoelectric power generation unit which are located in the shell; and a corresponding power management circuit. The interior of the shell is connected with the top end and the bottom end in a penetrating mode through a glass fiber connecting shaft. A friction power generation unit, an electromagnetic power generation unit and a piezoelectric power generation unit are sequentially mounted at the bottom end, opposite to the shell, of the glass fiber connecting shaft; the piezoelectric power generation unit comprises at least four cantilevers and a disc, one end of each cantilever is fixed on the disc, and a mass block is placed on the upper surface of the other end; the center of the disc is connected with a glass fiber connecting shaft, and the inner sides of the upper surfaces of the four cantilevers are covered with PZT materials. According to the hybrid nano generator, vibration energy in the environment can be converted into electric energy, and energy is supplied to wireless sensor network nodes.

The invention discloses a droplet friction nano-generator and a preparation method thereof, and the preparation method comprises the following steps: 1, mixing PDMS with a curing agent to prepare a PDMS solution; pTFE particles and ethyl alcohol are mixed, ultrasonic dispersion is carried out, and PTFE turbid liquid is obtained; 2, mixing the BaTiO3 particles with a PDMS solution, and carrying out ultrasonic dispersion to obtain a mixture; 3, blade-coating the mixture on the surface of a substrate, vacuumizing, drying and pre-curing; 4, spraying the PTFE turbid liquid on the surface, drying, curing and forming, and forming a coating on the surface of the substrate; and 5, arranging a top electrode at the middle position of the surface of the object obtained in the step 4. By doping BaTiO3 and spraying PTFE, the droplet friction nano-generator with an excellent power generation effect is prepared, the open-circuit voltage and output charge generated by a single droplet reach 230V and 315nC, and the droplet friction nano-generator is good in moisture resistance, mechanical durability and acid and alkali corrosion resistance.

The invention discloses an electromagnetic-friction nanometer hybrid generator for wind energy collection, which belongs to the technical field of wind energy, and comprises a stator shell, and a friction nanometer generator module and an electromagnetic generator module are packaged in the stator shell. The electromagnetic generator module is coupled with the friction nanometer generator module and is embedded with the friction nanometer generator module, and the electromagnetic generator module is connected with the friction nanometer generator module through a coaxial connector. According to the electromagnetic-friction nanometer hybrid generator oriented to wind energy collection, the basic configuration and the working principle of the hybrid friction nanometer generator are redesigned, and the soft contact friction nanometer generator based on the ternary dielectric triboelectrification effect is a hybrid electromagnetic generator; efficient energy conversion is realized by utilizing the triboelectrification characteristic of the soft contact material.

The invention particularly relates to hierarchical porous conductive gel, a preparation method thereof and a friction nano-generator. Aiming at the defects of mechanical property and electric conductivity of the existing conductive gel material, the invention provides the conductive gel with a multi-stage pore structure, food-grade raw materials are adopted, and the multi-stage pore structure is realized through a freeze-drying method and an interactive embedding mode of gel with different densities; the moist environment of an internal ion solution can be kept for a long time, and good stability and flexibility are achieved. The invention also provides a friction nano-generator using the gel material as a conductive medium, and the friction nano-generator has good electrical properties and good application prospects when applied to wearable electronic equipment.

The present invention discloses a self-powered marine environment monitoring network system, including a data acquisition unit, a mid-end data processing unit and a remote receiving end; the mid-end data processing unit is arranged on the top of the ship for wireless communication to receive the collected data of several data acquisition units scattered on the sea surface and to summarize the collected data in the form of Beidou short message and send it to the remote receiving end; the data acquisition unit includes a friction nanogenerator, an energy storage module, a first single-chip microcomputer, a temperature sensor, a water quality sensor, a GPS positioning module, and a first wireless transmission module; the friction nanogenerator converts wave energy into electrical energy and stores it in the energy storage module; the temperature sensor, the water quality sensor, the GPS positioning module and the first wireless transmission module are electrically connected to the first single-chip microcomputer. The main innovation of the present invention is that the friction nanogenerator is used to power the data acquisition unit, which can realize sustainable and long-term power supply, and there is no need to consider the power supply problem during drifting.

The invention belongs to the technical field of generator devices, and relates to a bionic snail gold spiral structure all-directional collection wave energy friction nano generator, which comprises a packaging shell, a spring, a bounce bin, a pendulum bob, SR-TENG and VF-TENG. The SR-TENG in the horizontal direction and the inelastic connecting rod are sealed in the bouncing bin through the attached pendulum bob, the upper portion of the bouncing bin is connected with the spring, and the VF-TENG in the vertical direction is connected and integrally sealed in the packaging shell. The bionic snail shell gold spiral line structure is high in space utilization rate and small in device size, compared with other multi-degree-of-freedom TENG, horizontal 360-degree all-directional wave energy collection is achieved, integrity is high, only two wires are needed for the inner layer and the outer layer of the horizontal structure, wiring is simple, the pendulum motion frequency is high, low-frequency energy can be collected, and the device is suitable for large-scale popularization and application. The curved surface soft contact friction structure effectively increases the contact area.

The invention discloses a pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction. The pedestrian bridge vibration comfort evaluation platform comprises a self-energized sensing vibration force measurement platform and an analysis control system, the self-energized sensing vibration force measuring platform comprises a plurality of self-energized sensing force measuring tables and a servo control motor; friction nanometer generator self-powered three-way force measuring blocks are densely distributed on the self-powered sensing force measuring table; the analysis control system comprises a data acquisition module, a feedback control module and a data output module, acquires a three-dimensional pedestrian load on the self-energized sensing vibration force measuring platform in real time, calculates bridge dynamic response based on a pedestrian bridge finite element model, and further feeds back and controls the vibration state of the self-energized sensing vibration force measuring platform to simulate the actual vibration condition of the bridge; and finally, evaluating the vibration comfort of the bridge according to the dynamic response characteristics of the bridge in the whole loading process. According to the invention, real-time interaction between the computer end and the self-energized sensing vibration force-measuring platform is realized, sensing energy consumption is reduced, and a pedestrian bridge vibration comfort assessment result closer to a real situation is obtained.

The invention relates to a high-altitude scaffold environment monitoring device and method based on a wind energy friction nanometer generator, and belongs to the field of high-altitude scaffold environment detection. The device comprises a wind energy friction nanometer generator, an energy management circuit, a sensor for monitoring the environment, a data processing unit and an alarm device, the wind energy friction nanometer generator is installed on a scaffold to collect low-frequency wind energy in the environment and convert the low-frequency wind energy into electric energy, and the electric energy is stored in the energy storage capacitor through the energy management circuit so as to drive the sensor for monitoring the environment. And then, data acquired by the sensor for monitoring the environment is sent to the data processing unit for analysis, the working safety of the scaffold environment is judged according to a preset environment threshold value, and when actual data exceeds a preset range, the alarm device is triggered to give an alarm so as to timely remind a worker that potential safety hazards exist when the scaffold is used in the environment. The safety and stability of a constructor can be effectively improved when the constructor uses the scaffold to work.

The invention discloses a gait sensing unit of a triboelectric nano generator based on liquid metal / PDMS porous sponge, and relates to the field of gait sensors, and the sensing unit with high porosity, flexibility and durability is prepared through a template method. A white granulated sugar template is adopted to construct a three-dimensional communicated porous structure, so that uniform dispersion of LM in a PDMS matrix is realized, and the technical problem that low density and high sensitivity of traditional TENG are difficult to consider at the same time is solved. The preparation method comprises the steps of mixing and stirring, template infiltration, curing molding, template dissolution and the like, flexible sensors with thousand secondary cycle stability can be produced in batches, and the flexible sensor is suitable for wearable health monitoring equipment.

The invention relates to the technical field of fluid pressure sensing, in particular to a triboelectric hemispherical composite film pressure sensing device and a control method thereof, and the device comprises a shell, a top gland and a sensing unit located in the shell. The sensing unit comprises an insulating cover plate, a composite film, an insulating ring cover, a transmission buffer block, an annular end cover and a hemispherical composite film from bottom to top. The composite film directly contacts with hydraulic oil, deforms under pressure and acts with the copper foil on the lower side of the transmission buffer block to generate a first electric signal; when the pressure is increased, the transmission buffer block is pushed to move upwards, so that the spherical copper foil on the upper side acts with the hemispherical composite film to generate a second electric signal. Self power supply is realized by utilizing a friction nanometer power generation principle, wide-range monitoring is realized through a double-layer sensing structure, and the sensor has the advantages of high sensitivity, good sealing performance, adaptability to complex hydraulic working conditions and the like in cooperation with a spherical surface contact design and a multi-sealing structure.

The invention discloses an oscillating hydrofoil type optimization long-time self-sustaining energy collection device and an energy collection method. The energy collecting device comprises a plurality of oscillating hydrofoil units which are arranged at intervals, and the oscillating hydrofoil units are distributed in an array mode. Each oscillating hydrofoil unit comprises a hydrofoil shell and a friction nano-generator, a plurality of friction nano-generators which are arranged in parallel along the chord length of the hydrofoil chord and cling to each other are arranged in the hydrofoil shell, and the size of each friction nano-generator changes along with the thickness of the hydrofoil shell; and the upper and lower cambered surfaces of each friction nano-generator are tangent to the inner wall of the hydrofoil shell. When the oscillating hydrofoil unit performs pitching or surging under the action of tidal current, the friction nano-generator in the oscillating hydrofoil unit captures mechanical energy in real time and generates power, a traditional oscillating hydrofoil energy conversion device is replaced, the structure is simpler, production is simpler and more convenient, cost is lower, and energy capturing efficiency and self-sustaining performance are improved.

The invention discloses a flexible friction nano-generator material based on silk fabric and Ecoflex as well as a preparation method and application of the flexible friction nano-generator material. The invention mainly comprises a positive friction layer material SF / beta-LGF / ZnO and a negative friction layer material Ecoflex / Ag-MMT. Specifically, the positive friction layer is prepared through the following steps that firstly, beta-lactoglobulin is converted into amyloid fibril at the specific pH and temperature, then beta-LGF is loaded on the surface of silk fabric through a cross-linking agent, and a ZnO film grows on the surface of the silk fabric through the atomic layer deposition technology. The negative friction layer is based on biodegradable Ecoflex, and the electrical property of the negative friction layer is improved by doping Ag intercalated montmorillonite. According to the invention, not only are the electron donating and electron withdrawing capabilities of the silk fabric and Ecoflex enhanced, but also the electric output performance of the friction nano-generator is remarkably improved, and low-frequency mechanical energy can be efficiently converted into electric energy.

An antimicrobial face mask that includes a triboelectric nanogenerator (TENG) membrane interior portion. The face mask also includes one or more antimicrobial substances. In some examples, the face mask includes both copper and silver, each of which has antimicrobial properties and together have a greater antimicrobial effect than each of them individually. The face mask improves upon existing personal protective equipment (PPE) face masks to reduce transmission and infection from microbial pathogens, including SARS-CoV-2, its variants, other viruses and various forms of bacteria.

The invention discloses a method for detecting miRNA-21 based on a paper base-friction power generation sensing chip of intelligent DNA hydrogel and application. The method comprises the following steps: preparing Pt-Ni NPs; the preparation method comprises the following steps: preparing hydrogel embedded with Pt-Ni NPs; designing a paper-based micro-fluidic chip; the miRNA-21 is recognized through a CRISPR-Cas12a system, the gel is cut, internal Pt-Ni NPs signal molecules are released, and a blue strip is displayed on the paper-based micro-fluidic chip; a nano generator is connected with the chip to prepare a paper base-friction power generation sensing chip; along with the change of the concentration of the miRNA-21, the gel releases Pt-Ni NPs with different concentrations to cause the voltage change on the paper-based friction power generation sensing chip, and the change value is in direct proportion to the concentration of the miRNA-21. The chip is used for detecting miRNA-21 and has the advantages of simplicity in operation, small size, portability, high sensitivity, good specificity and short detection period.