267 results about "Copper nanoparticle" patented technology

The invention discloses photo-thermal controlled-release nitric oxide anti-biofilm hydrogel based on click reaction crosslinking as well as a preparation method and application of the photo-thermal controlled-release nitric oxide anti-biofilm hydrogel based on click reaction crosslinking, the hydrogel is prepared by taking azide group-containing four-arm polyethylene glycol and alkynyl modified hyaluronic acid as matrixes through click chemistry rapid crosslinking under the catalysis of copper-based nanoparticles, the antibacterial biological membrane has remarkable dual anti-biological membrane and anti-inflammatory effects, and can be applied to wound treatment of bacterial biological membrane infection; through a wound surface coating form, under near-infrared light irradiation, copper nanoparticles generate a mild photothermal effect to remove a biological membrane, and Cu < 2 + > is released to promote fibroblast proliferation; nitric oxide can be controllably released, a biological membrane is synergistically eliminated by enhancing lipid peroxidation and destroying a bacterial membrane structure, meanwhile, angiogenesis is promoted, collagen deposition is stimulated, and the wound healing process is accelerated; the invention has the functions of efficient antibiosis and tissue regeneration, and has wide clinical application prospect and development value in the field of infectious wound treatment.

The invention discloses a preparation method of a modified electrode based on carbon nanofibers and application of the modified electrode in efficient reduction of nitrate and removal of associated organic matters, and belongs to the crossing field of materials science, chemistry and environmental engineering. The preparation method comprises the following steps that firstly, foamed nickel is pretreated, then, carbon nanofibers are loaded on the pretreated foamed nickel through an impregnation and calcination method, and finally, metal copper is deposited on the surfaces of the carbon nanofibers through an electro-deposition method. The introduction of the carbon nanofibers provides a larger specific surface area for the metal copper, promotes the high dispersion of metal copper nanoparticles, and affects the formation of a copper crystal face, thereby significantly improving the catalytic activity of the electrode. The electrode prepared by the method has excellent electro-catalytic performance, is relatively low in cost, is easy to operate and control, and is easy to realize industrial production. The electrode can simultaneously realize efficient reduction of nitrate and degradation of organic matters in an electro-catalysis system, and has a wide application prospect.

The invention discloses copper paste, an electrode and a preparation method and application of the electrode, the electrode comprises copper powder, the copper powder comprises nano-copper particles and flaky copper powder, the nano-copper particles comprise at least two connected copper nanoparticles, and the adjacent copper nanoparticles are connected in a surface contact mode. According to the electrode disclosed by the invention, the nano-copper particles formed by connecting more than two copper nano-particles are filled in the gap areas among the large-size flaky copper powder, so that the nano-copper particles are in direct contact with the flaky copper powder, conductive channels among the conductive particles are smoother, and the structure of the electrode is more compact due to the filling of the nano-copper particles; the bulk resistance of the electrode is greatly reduced and is equal to the conductivity of a silver electrode; the nano-copper particles can also be used as an auxiliary adhesive after being sintered and cured, so that the adhesive force between the copper grid line and the solar cell is improved, and the connection between the grid line and the solar cell is firmer.

The invention discloses antibacterial glaze paste for a ceramic false tooth and a preparation method thereof, and belongs to the technical field of antibacterial glaze paste manufacturing, the antibacterial glaze paste for the ceramic false tooth comprises: 70-95% of glaze powder matrix composed of feldspar, quartz, kaolin and calcium carbonate; the antibacterial agent is composed of zinc oxide and bismuth oxide, the molar ratio of the bismuth oxide to the zinc oxide is 5%-18%, the surfaces of particles of the antibacterial agent are coated with a plurality of silicon dioxide shell layers, the thickness of the shell layers is 3-15 nm, and the shell layers are treated through a coupling agent; the antibacterial agent can further contain a trace amount of silver or copper nanoparticles with the mass fraction of 0.01-0.3%, and through the synergistic effect of zinc oxide and bismuth oxide, limited release of multiple SiO2 shell layers and addition of a trace amount of Ag / Cu, the ceramic false tooth antibacterial glaze paste can keep efficient antibacterial ability for a long time without external illumination or special excitation conditions, the antibacterial rate is larger than or equal to 98%, and the antibacterial effect is good. The method is obviously superior to uncoated or single-step sintered contrast samples.

The invention relates to a porphyrin metal organic framework composite material, a preparation method and a biogenic amine SERS (Surface Enhanced Raman Scattering) array sensor. The preparation method of the composite material comprises the steps that a copper precursor solution is added into a surfactant, heating reaction is conducted, a reducing agent is added, heating reaction is conducted, and copper nanoparticles are obtained; the preparation method comprises the following steps: adding a transition metal salt and a surfactant into an organic solvent, adding a porphyrin ligand, carrying out a solvothermal reaction, carrying out centrifugal separation, washing and drying to obtain a porphyrin metal organic framework material, and dispersing the porphyrin metal organic framework material into the organic solvent to obtain a dispersion liquid A; and dispersing copper nanoparticles in the dispersion liquid A, carrying out a second heating reaction, and carrying out centrifugal separation, washing and drying to obtain the porphyrin metal organic framework composite material. The invention also provides the porphyrin metal organic framework composite material prepared by the preparation method, and the application of the porphyrin metal organic framework composite material as a biogenic amine SERS array sensor. The invention solves the problem that the accuracy of the detection result is influenced because the traditional biogenic amine detection method is difficult to realize field detection.

The invention discloses an antibacterial dressing based on gallic acid-copper coated gamma-polyglutamic acid and a preparation method and application thereof, and belongs to the technical field of biomedicines.The preparation method comprises the steps that gallic acid and copper chloride dihydrate are dissolved in pure water according to the mass ratio of 3: 1, and stirring is conducted to form a solution I; stirring and reacting the solution I at 40 DEG C for 24 hours, centrifuging, collecting precipitate, washing with pure water, and freeze-drying to obtain gallic acid-copper nanoparticles; the gallic acid-copper nanoparticles and gamma-polyglutamic acid powder are mixed and dissolved in pure water according to the mass ratio of 3: 20, and after freeze drying, gallic acid-copper coated gamma-polyglutamic acid hydrogel powder is obtained. The gallic acid-copper coated gamma-polyglutamic acid hydrogel powder disclosed by the invention can absorb exudate near a wound and is subjected to in-situ gelation to form a hydration layer, so that damage to newborn tissues caused by frequent dressing replacement is avoided; it is verified that the healing promoting effect of the hydrogel can be remarkably enhanced through blue light adjuvant therapy, and the healing speed of infected wounds is remarkably increased.

The invention discloses a composite oxidized particle filter material and a preparation method thereof, and particularly relates to the technical field of oxidized particle filter materials, the filter material takes a ternary composite oxide of cerium dioxide-cobaltosic oxide-nickel oxide as a core material, has a hierarchical pore structure, and is coated with a pH responsive coating on the surface; the preparation method comprises the following steps: S1, biological template pretreatment; S2, sol-gel synthesis; S3, graded pore channel construction; and S4, surface modification. According to the invention, the cerium dioxide-cobaltosic oxide-nickel oxide ternary composite oxide is taken as a core, pollutants are efficiently degraded under visible light and infrared light by virtue of graded pore channels, surface copper nanoparticles and internal up-conversion nanoparticles, and the quaternary ammonium salt compound grafted on the surface has good antibacterial property, can inhibit microorganism breeding and prolong the service life of the filter material; the whole preparation process is suitable for industrial production.

Provided are copper nanoparticles that: (I) have excellent dispersibility in an organic solvent and thus makes a paste containing the copper nanoparticles from which a highly smooth coating film can be formed; and (II) have excellent sinterability at low temperatures. At least a portion of the surface layer of each of the copper nanoparticles coated by a reducing agent is a film that contains copper oxide and optionally contains copper carbonate. The surfaces of the copper nanoparticles are coated with a reducing agent, where the mass carbon concentration is 0.10% to 2.00%.

The invention provides high-conductivity low-temperature copper paste as well as a preparation method and application thereof. The high-conductivity low-temperature copper paste comprises copper nanoparticles, an organic carrier and an antioxidant, the surface of the copper nanoparticle does not contain macromolecular ligand, the purity is greater than or equal to 98%, the particle size is less than or equal to 1 mu m, and the particle size variation coefficient is less than or equal to 35%; and after the high-conductivity low-temperature copper paste is cured at 200 DEG C, the resistivity is less than or equal to 34.4 mu omega.cm. The surfaces of the copper nanoparticles do not contain macromolecular ligands, so that the macromolecular ligands can be prevented from remaining on the surfaces of the copper nanoparticles in the process of regulating and controlling the morphology of the particles, and the organic carrier can uniformly disperse the copper nanoparticles and provide the bonding force between the slurry and a base material after the slurry is cured; the high-conductivity low-temperature copper paste has the advantages that the high-conductivity low-temperature copper paste is good in conductivity and adhesion, the printing precision and the oxidation resistance of traditional paste can be improved, and the high-conductivity low-temperature copper paste is suitable for large-scale production and preparation of precise electronic products.

The invention relates to a cationic polymer coated copper-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: adding copper nanoparticles into a quaternized spiropiperazine solution, uniformly stirring, adjusting the pH value to 9-13, and then adding a 1, 3, 5-benzoyl chloride solution for reaction to obtain the copper-based catalyst coated with the cationic polymer. The copper-based catalyst coated with the cationic polymer shows excellent carbon dioxide electrocatalytic reduction performance in an electrolytic tank under the acidic condition through a three-in-one mechanism of electrostatic enrichment, coordination stabilization and cross-linking strengthening, ethanol can be efficiently prepared, and the Faraday efficiency reaching up to 50% is achieved under the current density of 250 mA / cm < 2 >.

The invention relates to a cellulose membrane-based fluorescence colorimetric sensor based on nano-copper and MOF (Metal Organic Framework), a preparation method of the cellulose membrane-based fluorescence colorimetric sensor and application of the cellulose membrane-based fluorescence colorimetric sensor in tetracycline detection The sensor comprises a cellulose membrane, nano-copper clusters and MOF-5, the nano-copper clusters are fixed on the surface of the porous cellulose membrane through hydrogen bonds to form CCM, and then the MOF-5 is further loaded on the surface of the cellulose membrane to obtain the CCMM. When tetracycline exists in a sample to be detected, Zn (II) in the sensor and tetracycline form a luminous complex, so that the color of the trigger fluorescence is changed from orange red to green. The sensor provided by the invention has the advantages of high sensitivity (the detection limit is 0.5 mu M), quick response (qualitative treatment within 5 seconds), excellent selectivity (resistance to influences of various metal ions and interferents), good long-term stability (the performance is not changed after the sensor is stored for 60 days) and the like, and can be used for carrying out real-time visual detection on TC in drinking water, environmental water, milk and other samples.

The invention discloses a three-dimensional porous self-supporting electrode constructed by in-situ growth of copper nanoparticles on the surface of foamed nickel for hydrogen evolution by water electrolysis and a preparation method of the three-dimensional porous self-supporting electrode. The preparation method of the three-dimensional porous self-supporting electrode constructed by in-situ growth of the copper nanoparticles on the surface of the foamed nickel comprises the following steps: taking the foamed nickel as a working electrode, taking a mixed solution composed of a copper salt, a chlorine salt, an inorganic acid and deionized water as an electrolyte, and carrying out electrodeposition by adopting a timing coulometric method to obtain the three-dimensional porous self-supporting electrode constructed by in-situ growth of the copper nanoparticles on the surface of the foamed nickel; the three-dimensional porous self-supporting electrode constructed by in-situ growth of the copper nanoparticles on the surface of the foamed nickel is obtained. According to the preparation method, the self-supporting electrode without the adhesive is prepared through the one-step electrodeposition method with the hydrogen bubbles as the dynamic template, no precious metal participates in the self-supporting electrode, and the problems that active sites are blocked, the conductivity is reduced or gas transmission is inhibited due to the fact that a Nafion solution and other polymer adhesives with poor conductivity are used in a traditional powdery catalyst can be effectively solved. The electrode prepared by the invention has excellent HER performance and good stability.

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The invention discloses a preparation method of a bionic wear-resistant composite structure for a railway turnout slide plate, and belongs to the field of rail transit, and the preparation method comprises the following steps: step 1, constructing a bionic sand python snake slough structure model; 2, preparing a bionic sand python snake slough structure; 3, the polytetrafluoroethylene spherical powder is submerged in absolute ethyl alcohol, 5 wt% of graphene nanosheets, 1 wt% of spherical copper nanoparticles and 1 wt% of KH550 are added, and finally a mixed solution is obtained; 4, drying the mixed solution to obtain composite powder; 5, placing the composite powder on the bionic sand python snake slough structure, and performing cold pressing for multiple times to obtain a semi-finished bionic wear-resistant composite structure; and 6, the semi-finished bionic wear-resistant composite structure obtained after cold pressing in the step 5 is completed is placed in a sintering furnace to be subjected to melting sintering treatment, and the bionic wear-resistant composite structure is obtained after cooling.

The application relates to the development and technical field of electrocatalysts, and discloses a benzothiadiazole modified single-atom zirconium-doped metal copper electrode material and a preparation method and application thereof. The preparation method comprises the following steps: dissolving inorganic copper salt and inorganic zirconium salt, adding the inorganic copper salt and the inorganic zirconium salt into an alkaline solution, and performing hydrothermal reaction to obtain a single-atom zirconium-doped copper oxide precursor; dissolving benzothiadiazole, adding the benzothiadiazole into a dispersion solution of the single-atom zirconium-doped copper oxide precursor to obtain a mixed solution; spraying the mixed solution on a polytetrafluoroethylene film substrate loaded with copper nanoparticles to obtain a benzothiadiazole modified single-atom zirconium-doped copper oxide precursor electrode material; and performing electrochemical reduction treatment on the benzothiadiazole modified single-atom zirconium-doped copper oxide precursor electrode material to obtain a benzothiadiazole modified single-atom zirconium-doped metal copper electrode material. The electrode material is applied to an electro-reduction carbon dioxide reaction as a working electrode, exhibits excellent electro-reduction CO2 performance in an acidic environment, and realizes high-value-added C 2+ product with high selectivity.

The invention relates to the technical field of fibers, and discloses a high-breathability antibacterial functional composite fabric and a preparation method thereof. The preparation method comprises the following steps: loading copper nanoparticles on nano zinc oxide by an in-situ reduction method to obtain an inorganic antibacterial agent, uniformly mixing the inorganic antibacterial agent and an organic antibacterial agent 1-chloro-2, 2, 5, 5-tetramethyl-4-imidazolinone with polyacrylonitrile to obtain a spinning solution, and carrying out electrostatic spinning on the surface of an acrylic fabric to obtain the antibacterial fabric. The obtained composite fabric has high air permeability and excellent antibacterial property.

The application provides a one-dimensional iron oxide nanorod heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of photoelectrocatalytic water splitting hydrogen production. The composite material provided by the application comprises: one-dimensional iron oxide nanorods, cuprous sulfide nanoparticles loaded on the one-dimensional iron oxide nanorods, and cobalt hydroxide nanosheets coated on the surfaces of the one-dimensional iron oxide nanorods and the cuprous sulfide nanoparticles. On one hand, the Fe2O3 / Cu2S p-n heterojunction is introduced to accelerate the separation of photo-generated carriers in the Fe2O3 nanorod array, and on the other hand, the Co(OH) x The surface OECs accelerate the kinetics process of interfacial water oxidation, the rapid depletion of photo-generated holes further improves the charge separation of the photoanode surface, and the synergistic effect between the Fe2O3 / Cu2S p-n heterojunction and the OECs significantly improves the PEC water splitting performance of the iron oxide nanorod array composite material.

One object of the present application is to provide composite copper nanoparticles that have high dispersibility in organic solvents and can be used to form a smooth electrode film. The present invention provides composite copper nanoparticles in which the surfaces of copper nanoparticles are modified with a silane coupling agent, wherein the copper nanoparticles have a coating film containing copper oxide on at least a part of the surface, and wherein the mass carbon concentration derived from the silane coupling agent in the composite copper nanoparticles is 0.1 to 1.2% by mass with respect to the total mass of the composite copper nanoparticles or wherein the number of surface groups derived from the silane coupling agent on the surface of the composite copper nanoparticles is 1.0 to 13.0 per 1 nm2 of the surface area of the composite copper nanoparticles

The invention discloses a method for preparing a water inlet separation net loaded with copper oxide nanoparticles and having a self-cleaning function, and particularly relates to a method for preparing the water inlet separation net with the self-cleaning function by constructing a dopamine coating on a polypropylene separation net and then loading the copper oxide nanoparticles. The preparation method comprises the following steps: introducing a dopamine solution to the surface of a polypropylene separation net to form a polydopamine coating, chelating Cu by using surface functional groups of the polydopamine coating, then forming Cu (OH) in an alkaline environment, and further converting the Cu (OH) into CuO nano-particles to be deposited on the surface of the separation net; the finally prepared functional separation net is stable in structure, has self-cleaning capability, and can effectively slow down pollution in roll-type reverse osmosis and nanofiltration membrane elements.

The invention discloses a method for degrading pyridine in waste water, which comprises the following steps: dissolving sodium hydroxide and ascorbic acid in an ethanol solution to form a colorless and transparent solution, measuring the colorless and transparent solution, slowly dropwise adding the colorless and transparent solution into the prepared ethanol solution containing copper chloride, stirring by using a magnetic stirrer at room temperature, and filtering to obtain a filtrate; and finally, green and clear copper nanoparticles are formed. Mixing an ethanol solution containing glutathione with the prepared copper nanoparticles, stirring and reacting at room temperature to obtain a white precipitate, and centrifuging and drying to obtain the prepared copper nano enzyme; the method comprises the following steps: domesticating activated sludge, taking the domesticated pyridine wastewater, adjusting the pH value, adding hydrogen peroxide and copper nano-enzyme for reaction, then adding into an SBR (sequencing batch reactor), and finally measuring the content of pyridine in the treated wastewater. The hydrogen peroxide and the copper nano-enzyme can generate a Fenton-like reaction, so that pyridine can be efficiently degraded, the reaction process is rapid, the operation is simple, the cost is low, and the green and environment-friendly effects can be realized.

The application relates to the development and technical field of electrocatalysts, and discloses a preparation method and application of a proton sponge modified fluorine atom doped metal copper electrode material, which comprises the following steps: adding a dispersion solution of a proton sponge into a dispersion solution of a hydroxyl copper fluoride precursor to obtain a mixed solution; uniformly spraying the mixed solution on a polytetrafluoroethylene film substrate loaded with copper nanoparticles to obtain a proton sponge modified hydroxyl copper fluoride precursor electrode material; and then electrochemically reducing the proton sponge modified hydroxyl copper fluoride precursor electrode material to obtain the proton sponge modified fluorine atom doped metal copper electrode material. The application further discloses the proton sponge modified fluorine atom doped metal copper electrode material obtained by the above preparation method and application of the proton sponge modified fluorine atom doped metal copper electrode material to an electro-reduction carbon dioxide reaction as a working electrode. The electrode material provided by the application exhibits excellent electro-reduction CO2 performance in an acidic environment, and realizes the preparation of high-value C 2+ products with high selectivity under an industrial-grade current density.

This application provides a method for preparing gallium oxide (GaO) with enhanced ultraviolet absorbance and a GaO material prepared according to this method. First, a GaO thin film capable of generating ultraviolet absorption is grown on a substrate by magnetron sputtering. The GaO thin film is then annealed. Next, a copper thin film is grown on the GaO thin film by magnetron sputtering, followed by rapid annealing, causing the copper film to crack into copper nanoparticles under heat. This preparation method utilizes copper nanoparticles to enhance the ultraviolet absorption performance of GaO. The process steps are simple and easy to operate, thus effectively reducing the preparation cost. Furthermore, the GaO material prepared by this method shows a significant improvement in ultraviolet absorbance.

The invention discloses a photoresist composition based on metal nanoparticles and application of the photoresist composition. The photoresist composition comprises metal nanoparticles, a photosensitizer, an anti-diffusion agent and a photoresist solvent, wherein the metal nanoparticles are silver nanoparticles, copper nanoparticles and gold nanoparticles. The photoresist composition has good film-forming property and excellent patterning imaging capability, photoetching patterns with different resolutions can be obtained through ultraviolet, electron beam or extreme ultraviolet exposure, and the formed patterns have good conductivity after being subjected to heat treatment and can be directly used for processing micro-nano devices.

The invention provides a dialysis catheter based on a swirl flow technology, and relates to the field of dialysis catheters.The dialysis catheter comprises a connecting mechanism, the connecting mechanism comprises a connecting block, a vein connecting pipe and an artery connecting pipe, and a catheter mechanism is arranged at the bottom of the connecting mechanism; the catheter mechanism comprises a venous catheter, a venous side hole, an arterial catheter, an arterial side hole and a spiral flow induction unit, the inner wall and the outer wall of the catheter mechanism are each provided with a nano-coating mechanism, and each nano-coating mechanism comprises a copper nano-particle coating and a black phosphorus nano-coating. By arranging the spiral flow inducer, blood pressure is rotated, the wall surface shear stress of the inner wall of an artery cavity is improved, the risk of thrombus generation is reduced, wall suction is effectively prevented by arranging the vein side hole and the artery side hole, and the thrombus generation risk is reduced. Through cooperation of the copper nanoparticle coating, the black phosphorus nano coating and the graphene oxide coating, the coating has multiple antibacterial mechanisms such as contact sterilization, ion interference, oxidative stress induction and the like.

The invention provides a preparation method of a composite fiber and a fabric with sunlight barrier performance. The preparation method of the composite fiber comprises the following steps: S10, respectively preparing a skin layer melt and a core layer melt; the skin layer melt comprises a thermoplastic polymer matrix and titanium dioxide particles; the core layer melt comprises a thermoplastic polymer matrix, titanium dioxide particles and cesium tungsten bronze nanoparticles; s20, the skin layer melt and the core layer melt are introduced into a composite spinning assembly, the skin layer melt is controlled to wrap the core layer melt to form skin-core type composite fluid, and the skin-core type composite fluid is extruded through a spinneret plate with triangular holes; and S30, carrying out cross air blowing cooling, drafting and winding on the extruded fluid to obtain the sheath-core type composite fiber with a triangular cross section outer contour. The composite fiber can keep good spinnability and hand feeling, can block sunlight and heat at the same time, and provides better wearing comfort.

The application belongs to the technical field of catalysts, and particularly relates to a copper-based catalyst, a preparation method thereof and a method for synthesizing polycarbon alcohol from CO2 / CO. The preparation method of the copper-based catalyst provided by the application comprises the following steps: loading a copper nanoparticle solution into a high-pressure reaction kettle with a stirring rotor, first performing gas washing treatment by using high-purity CO gas, then filling CO, sealing the high-pressure kettle and transferring the high-pressure kettle to a heating container, performing reaction under stirring and heat preservation, performing pressure relief to normal pressure after the reaction, and performing centrifugal separation and drying treatment to obtain copper nanobands. The method adopts CO to assist in growing the copper-based catalyst, and widens the catalyst system for synthesizing polycarbon alcohol products.

Metallic nanoparticle agglomerates can deliver biocidal activity to surfaces on which they are deposited and adhered, such as various air filtration media. Air filtration media can include a plurality of fibers to which a plurality of metallic nanoparticle agglomerates are adhered. The metallic nanoparticle agglomerates can include a plurality of fused, partially fused, or unfused metallic nanoparticles associated with one another on the surface of the plurality of fibers. Suitable metallic nanoparticles for facilitating biocidal activity against various pathogens, such as viruses and bacteria, can include copper nanoparticles and / or silver nanoparticles. Face masks, inline filters, and air filtration systems can integrate the air filtration media.

The invention provides a solar cell and a photovoltaic module, and belongs to the technical field of solar cells. The solar cell comprises: a cell body having a first surface and a second surface opposite to each other; the plurality of current collection electrodes are positioned on the second surface of the battery body, and the plurality of current collection electrodes are alternately arranged at intervals according to different polarities; wherein the collector electrode is made of copper, and at least one copper nanoparticle is arranged on the first surface of the battery body. The copper nanoparticles on the front surface of the battery body can absorb and reflect short-wave ultraviolet light harmful to the battery body, so that performance degradation and material aging of the battery are delayed.

This invention discloses a method for fabricating a near-zero temperature coefficient thin-film pressure sensor with a wide temperature range. The purpose of this invention is to address the common problem of insufficient environmental adaptability in existing flexible thin-film sensors, particularly the significant performance degradation under extreme temperature conditions. This invention proposes a wide-temperature-range intrinsically self-compensating flexible pressure sensor based on a PVDF / CFT / Cu composite sensing material thin film. This sensor achieves a near-zero temperature coefficient of resistance for the composite material by synergistically introducing carbon fiber tubes with negative temperature coefficients and copper nanoparticles with positive temperature coefficients into the flexible PVDF matrix and dynamically controlling their ratio, thereby constructing a temperature self-compensation mechanism at the material level. This invention provides an effective material solution for developing next-generation high-reliability, wide-temperature-range adaptive flexible sensing systems.

The invention provides a cobalt porphyrin copper oxide graphene composite electrocatalyst and a preparation method and application thereof, and belongs to the technical field of water treatment. The catalyst obtained by the invention is used for electrocatalyzing nitrate in water to reduce and synthesize ammonia at room temperature. A surface physical modification method is adopted, cobalt porphyrin and a graphene raw material modified with copper oxide nanoparticles are mixed in an organic solvent, and the graphene-loaded copper oxide and cobalt porphyrin composite electrocatalyst is synthesized through simple pi-pi interaction. The method for preparing the catalyst is simple, cobalt porphyrin is introduced around copper oxide nano-particles through pi-pi interaction, synergistic catalysis of graphene, copper oxide and cobalt porphyrin in the nitrate electro-catalysis process is facilitated, and therefore the selectivity and activity of reducing nitrate into ammonia through electro-catalysis are improved; the ammonia yield and the Faraday efficiency are improved.