92results about "Lead compounds" patented technology

The invention relates to a black-phase all-inorganic perovskite flexible thick film stable at room temperature and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing PbI2, CsI and an organic ammonium salt in an organic solvent to obtain a perovskite precursor solution; filling a polymer filter membrane with the perovskite precursor solution through a vacuum filtration method to obtain a wet flexible thick membrane; the polymer filter membrane is cleaned, and the thickness is 50 microns or above; and carrying out gradient annealing on the wet flexible thick film to obtain the black-phase all-inorganic perovskite flexible thick film which is stable at room temperature. According to the invention, low-dimensional perovskite induced lattice distortion is formed by adding A-site cations, and the flexible thick film which is thermodynamically stable and uniform at room temperature is obtained based on a solvent suction filtration method by regulating and controlling the addition amount of organic ammonium salt and gradient annealing and regulating and controlling the proportion of residual organic ammonium salt of lattices, and is applied to an X-ray detector. High [mu] [tau] product and high sensitivity are realized, and good flexible detection performance is shown.

The invention provides a cesium lead halide perovskite target material and a preparation method and application thereof, and relates to the technical field of magnetron sputtering. The preparation method of the cesium-lead halide perovskite target material comprises the following steps: mixing cesium halide and lead halide, and carrying out ball milling to obtain precursor powder; pressing the precursor powder to obtain a cesium lead halide perovskite target material precursor; and carrying out annealing treatment on the caesium lead halide perovskite target material precursor to obtain the caesium lead halide perovskite target material. The preparation method is simple, no waste is generated in the preparation process, the surface of the target material is smooth, internal components are uniform, and a film prepared from the target material is uniformly distributed on a substrate and can be used for preparing an optical film; and the target material can be recycled after being used, and can be continuously used as a raw material for preparing the cesium lead halide perovskite target material.

The application provides a method for regulating halogen perovskite microstructure at a frozen temperature by using a laser and an electric field, and relates to a device, which is a customized TEM in-situ sample rod equipped with a laser optical fiber and a liquid nitrogen Dewar bottle, and a Nd:YAG pulse laser system with a wavelength of 532 nm, adjustable pulse frequency and a pulse duration of 7 ns coupled into a transmission electron microscope through the optical fiber; first, at a frozen temperature, perovskite nanocrystals are etched by controlling the energy, frequency and action time of the pulse laser, then at the frozen temperature, the small crystal nucleus rotation of the perovskite nanocrystals is controlled by using a low-energy pulse laser and applying an electric field, and the perovskite nanocrystals are recrystallized along specific crystal faces, so that perovskite nanocrystals with specific exposed surfaces, reduced microstructure defects and increased radiation resistance are obtained, and the method has great value for large-scale industrial production.

Disclosed is a self-powered perovskite X-ray detector. The self-powered perovskite X-ray detector according to an embodiment of the present invention has a shape wherein a scintillator converting incident X-rays into visible light is combined with a perovskite photodetector, wherein the scintillator and the perovskite light absorption layer include a perovskite compound represented by Formula 1 below:         [Formula 1]     AaMbXc where A is a monovalent cation, M is a divalent metal cation or a trivalent metal cation, X is a monovalent anion, a+2b=c when M is a divalent metal cation, a+3b=4c when M is a trivalent metal cation, and a, b, and c are natural numbers.

The application provides a perovskite superlattice, a preparation method and application in a nanoscale light emitting diode, and the preparation method comprises the following steps: S1, adding B raw materials, an organic ligand, a cosolvent and an organic polymer C into a solvent, and then heating in a vacuum environment to obtain a precursor 1; S2, adding A raw materials and a cosolvent into a solvent, and then heating in a vacuum to obtain a precursor 2; S3, heating the precursor 1 to a specified temperature in an inert gas atmosphere, mixing the precursor 2 with the precursor 1, and then reducing to room temperature at a set cooling rate, and then standing, centrifuging and cleaning to obtain a nanoscale perovskite superlattice; the organic polymer C is at least one of polymethyl methacrylate, low-density polyethylene, polyethylene, linear low-density polyethylene, polyvinylidene fluoride or isotactic polypropylene. The nanoscale light emitting diode has small size and high light emitting efficiency.

Systems and methods for generating radionuclides, such as radium-224. Systems herein may include a first cartridge having a first opening, a second opening, and a chamber therebetween having a first resin having affinity for thorium-228 and bismuth-212; a second cartridge having a first opening, a second opening, and a chamber therebetween having a second resin having affinity for thorium-228 and bismuth-212, a third cartridge having a first opening, a second opening, and a chamber therebetween comprising a third resin having affinity for thorium-228 and bismuth-212, a fourth cartridge having a first opening, a second opening, and a chamber therebetween having a third resin having affinity for lead-212; wherein a continuous flow path is formed from a top of the first cartridge though the second cartridge, through the third cartridge, and to a bottom of the fourth cartridge during system use.

The invention provides a composite membrane for separating 226Ra and 210Pb as well as a preparation method and application thereof, and relates to the technical field of radioactive ion extraction and separation, and the preparation method comprises the following steps: mixing polyacrylonitrile, crown ether and ionic liquid to obtain a spinning solution, and spinning the spinning solution into a membrane to obtain the composite membrane. Effective extraction and separation of 226Ra and 210Pb in the uranium ore digestion solution can be realized, so that radioactive pollution in the environment is reduced, environmental resources can be recycled, meanwhile, the preparation method is simple and low in cost, and the prepared composite membrane is non-toxic and harmless and is beneficial to industrial application.

The application provides a CsPbBr3 / graphene composite material and a preparation method thereof.The composite material is prepared by using a precursor CsBr, a precursor PbBr2, oleic acid, oleylamine and graphene nanosheets as raw materials through an improved anti-solvent method to realize in-situ growth preparation.The all-inorganic perovskite nanocrystal / graphene structure obtained by the application combines the all-inorganic perovskite layer with high photon absorption and the graphene carrier transport layer, so that the all-inorganic perovskite nanocrystal / graphene structure has high light absorption, high conductivity and strong carrier separation capacity, and provides a reference and reference value for future new high-performance optoelectronic devices.

The invention discloses a mixed ligand modified cesium lead halide perovskite nanocrystal and a preparation method thereof, and the preparation method comprises the following steps: (1) adding CsBr and PbBr2 in an equal molar ratio into a P-AMDL polymer solution to obtain a CsPbBr3 precursor solution; (2) injecting the precursor solution into a toluene solvent, and then settling and purifying by using an n-hexane solvent to obtain a P-AMDL modified CsPbBr3 solution; (3) introducing an oleic acid oleylamine ligand to obtain CsPbBr3 modified by a mixed ligand; and (4) optimizing an ion exchange method by combining a mixed ligand strategy to obtain the mixed ligand modified CsPbBrxI3-x. According to the invention, the problem of wide particle size distribution of nanocrystals synthesized by an LARP method at room temperature is solved, and the all-inorganic cesium-lead halide perovskite nanocrystals with fewer defects, more regular morphology and better ultraviolet stability are successfully prepared. The'micromolecule + polymer 'mixed ligand strategy gives consideration to the regulation and control precision of the micromolecule ligand and the stability of the polymer ligand, and is an effective means for optimizing the morphology and performance of the perovskite nanocrystal.

The invention belongs to the technical field of heterostructure construction, and particularly relates to a SnS2 / CsPbBr3 heterojunction as well as a preparation method and application thereof. The preparation method of the SnS2 / CsPbBr3 heterojunction comprises the following steps: taking a hexagonal 2D SnS2 nanosheet synthesized by a hydrothermal method as a growth template, combining with a 3D CsPbBr3 nanocube synthesized by a solution method, and successfully constructing the 2D / 3D SnS2 / CsPbBr3 heterojunction through an electrostatic self-assembly technology. The invention innovatively provides a heterojunction preparation strategy aiming at the problems of serious interface charge recombination, low photoresponse efficiency and the like of a metal halide perovskite material. Through an electrostatic self-assembly technology, a 2D / 3D SnS2 / CsPbBr3 heterojunction system is successfully constructed, and the problems of serious interface recombination, low light response rate and the like of metal halide perovskite in photoelectric application are successfully broken through.

The present invention is directed to an antimicrobial substrate having a layer of PbTe quantum dots (QD) attached to an outer surface of the material. Further provided is a method of fabrication the substrate / modification of a material for obtaining an antimicrobial surface.

The present application relates to the field of microcrystalline materials, and in particular to a perovskite-based microcrystalline material, its preparation process and application. The preparation process of the perovskite-based microcrystalline material specifically includes the following steps: S1: preparation of site material solution; S2: addition of framework particle raw materials; S3: preliminary synthesis of microcrystalline material; S4: preparation of composite microcrystalline material. The perovskite-based microcrystalline material prepared in the present application can effectively overcome the internal defects in the material, thereby avoiding the loss of photoelectric performance, and can ensure that the perovskite material has excellent stability under long-term illumination, high temperature and humidity environment, and still maintains good self-properties in high humidity environment, avoiding decomposition, and thus has very excellent application value.

The present invention pertains to: a method for forming a large-area perovskite thin film, whereby a uniform, large-area perovskite thin film can be manufactured without using an anti-solvent; a coating agent used in said method; and a perovskite solar cell including said perovskite thin film as a light absorption layer.

The pure alpha-CsPbI2Br thin film has excellent photothermal stability, but has poor humidity stability, and will be converted from alpha phase to delta phase and lose optical activity in a low humidity environment. In view of the problem, the application designs a method for preparing alpha-Cs 1‑x FA x PbI2Br(0<x<0.5) perovskite thin film. The application takes PbI2·DMSO and PbBr2·DMSO adduct as raw materials, and overcomes the problem that the obtained perovskite thin film is phase-separated when the content of FA is less than 50% in the preparation process of a traditional perovskite thin film. The synthesis process of the application is simple, and does not need complex anti-solvent treatment or heating process. Finally, the alpha-Cs 1‑x FA x The PbI2Br(0<x<0.5) thin film has large grain size, good crystallinity and high density, and the doping of a small amount of FA ions greatly increases the tolerance factor of the perovskite, and the humidity stability is obviously increased compared with CsPbI2Br; meanwhile, the alpha-Cs 1‑x FA x PbI2Br(0

This invention provides a method for 226 Ra and 210 This invention relates to the field of radioactive ion extraction and separation, specifically a composite membrane for Pb separation, its preparation method, and its applications. The method includes the following steps: mixing polyacrylonitrile, crown ether, and an ionic liquid to obtain a spinning solution; spinning this solution to form a composite membrane. This invention enables the separation of Pb from uranium ore digestion solutions. 226 Ra and 210 The effective extraction and separation of Pb reduces radioactive pollution in the environment and enables the recycling of environmental resources. At the same time, the preparation method is simple and low-cost, and the resulting composite membrane is non-toxic and harmless, which is conducive to industrial application.

To provide an ionic crystal using a new method that can further improve the heat resistance of the ionic crystal. [Solution] A surface-coated ionic crystal in which the surface of an ionic crystal is coated with a first polymer containing a first repeating unit which is a repeating unit having two or more zwitterionic structures in its side chain portion, and a second polymer containing a second repeating unit which is a repeating unit having only one zwitterionic structure in its side chain portion.

The invention discloses a method for mildly preparing a fluorine ion solid electrolyte, and belongs to the technical field of fluorine ion batteries. The method comprises the following steps: (1) selecting raw materials in a corresponding stoichiometric ratio according to a chemical formula of the fluorine ion solid electrolyte, and carrying out ball milling treatment on the raw materials to obtain mixed powder; the chemical formula of the fluorine ion solid electrolyte is CsPb < 1-x > M < x > F < 3-x > or RbPb < 1-x > M < x > F < 3-x >, m is Li, Na or K; the value range of x is 0 to 0.7; and (2) carrying out low-temperature heat treatment on the mixed powder at 100-300 DEG C until the reaction is completed to obtain the fluorine ion solid electrolyte. Through the specific formula design and the low-temperature annealing technology, the technology limitation of a traditional method is overcome, kilogram-level product preparation is achieved, and the technology is suitable for large-scale large-batch production. The prepared fluorine ion solid electrolyte has excellent comprehensive performance, and has a wide application prospect in the fields of rechargeable fluorine ion batteries and the like.

The invention discloses a low-threshold adjustable micro white light laser based on a perovskite micron sheet and a preparation method of the low-threshold adjustable micro white light laser in the field of semiconductor lasers. The low-threshold adjustable micro white light laser based on the perovskite micron sheet comprises a gain medium, the gain medium is an Erx: CsPbyClaBrbIc micron sheet, x + y = 1, a + b + c = 3, and x, y, a, b and cgt; 0; the Erx: CsPbyClaBrbIc micron sheet is of a Cl, Br and I halogen phase separation structure induced by Er < 3 + >, a stable three-phase pinning energy band is formed, and red laser, green laser and blue laser can be emitted at the same time. According to the low-threshold adjustable micro white light laser based on the perovskite micron sheet and the preparation method thereof, fine adjustment of chromaticity and color temperature can be achieved by adjusting halide composition, and the low-threshold adjustable micro white light laser has the advantages of being simple in preparation process, excellent in performance and high in stability.

The application belongs to the technical field of perovskite quantum dot material preparation, and relates to a perovskite aerogel yarn and a preparation method and application thereof. The preparation method comprises the following steps: mixing a silicon source, a weak alkaline catalyst, a mesoporous template and deionized water to react, and then performing washing and drying treatment to obtain a nano mesoporous SiO2 material; mixing and stirring the nano mesoporous SiO2 material with a fluorine source, a cesium source, a bromine source, a lead source and deionized water to obtain a precursor dispersion liquid; the precursor dispersion liquid is dried, calcined, washed, dried and ground to obtain fluorine-modified perovskite@SiO2 light-emitting particles; the fluorine-modified perovskite@SiO2 light-emitting particles are sprayed and coated on a nanofiber membrane, and then twisted, soaked and dried to form a perovskite aerogel yarn material. The material can still maintain high brightness and stable light-emitting performance under extreme environments such as 200 DEG C high temperature or humidity and water immersion, and significantly expands the application range of light-emitting fabrics.

The application discloses a method for improving water stability of a cesium-bismuth-bromine system quantum dot by using dendritic organosilicon molecules, and the method comprises the following steps: taking Cu2O as a catalyst, blending chloropropyl trimethoxysilane, ethylene glycol and liquid ammonia, and then reacting; after multiple rotary evaporation purifications, 3-aminopropyl trimethoxysilane is separated; Cs3Bi2Br9 QDs precursor liquid and 3-aminopropyl trimethoxysilane are added drop by drop into a mixed solution of oleic acid and anhydrous ethanol respectively, heating and vigorous stirring are conducted to obtain a colloidal solution; after the colloidal solution is cooled to room temperature, centrifugation is conducted, and the precipitate at the bottom is filtered to obtain a colloidal solution of Cs3Bi2Br9 QDs based on 3-aminopropyl trimethoxysilane in-situ modification. The application rapidly synthesizes a high-purity dendritic 3-aminopropyl trimethoxysilane under mild conditions through an intermediate, and further uses the 3-aminopropyl trimethoxysilane to modify Cs3Bi2Br9 QDs to improve water stability of the Cs3Bi2Br9 QDs.

A method of fabricating a halide perovskite having a general formula of ABX3, wherein A, B, and X are inorganic elements and X is a halide, the method including a vapor-liquid-solid process triggered by a catalyst formed from a noble metal; A nanowire of the halide perovskite and a photoelectronic device thereof.

The present application relates to a metal organic framework (MOF) glass composite comprising metal halide perovskite, and a method for its preparation.

This application relates to a method for preparing CsPbBr3 nanosheet materials and their applications. The method includes: mixing cesium carbonate, oleic acid, and an oil-phase solvent, and stirring and heating under an inert gas atmosphere until the solution becomes clear, obtaining a cesium precursor solution; mixing octadecene, oleic acid, oleylamine, and lead bromide, heating until the lead bromide is completely dissolved, and then cooling to 22°C to obtain a mixed clear solution; injecting the cesium precursor solution into the mixed clear solution, maintaining the temperature at 22°C for 10 seconds, adding isopropanol and acetylene dicarboxylic acid, heating to 100°C after 10 seconds and maintaining the temperature for 10 minutes, cooling the reaction temperature to room temperature, centrifuging and washing, and collecting the precipitate to obtain the CsPbBr3 nanosheet material. This application involves the use of the CsPbBr3 nanosheet material in the preparation of photodetectors. This application can improve the luminous efficiency and stability of CsPbBr3 nanosheets under blue light, and improve the performance of photodetectors based on CsPbBr3 nanosheets.

The invention discloses a lead thiophosphate composite nitrogen-doped carbon porous microsphere material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The preparation method of the lead thiophosphate composite nitrogen-doped carbon porous microsphere material comprises the following steps: dissolving a lead salt in an organic solvent, dissolving 2-methylimidazole in water, mixing the two solutions, carrying out solvothermal reaction, separating out a product, and reacting with a gas-phase sulfur source and a phosphorus source under the protection of inert gas to obtain the lead thiophosphate composite nitrogen-doped carbon porous microsphere material. The lead thiophosphate composite nitrogen-doped carbon porous microsphere composite material is obtained. According to the invention, a metal organic framework template method and a chemical vapor deposition method are ingeniously combined, and a brand new path for controllably preparing the lead thiophosphate composite nitrogen-doped carbon porous microsphere material is provided. When the prepared lead thiophosphate composite nitrogen-doped carbon porous microsphere material is used as a sodium ion battery negative electrode, a porous microsphere negative electrode formed by compounding lead thiophosphate and nitrogen-doped carbon shows remarkably improved electrochemical performance.

To provide a photoresponsive nanocrystal having a narrow FWHM blue emission wavelength or a narrow FWHM red emission wavelength in the color gamut defined by BT.2020. [Solution] A photoresponsive nanocrystal having a composite layer structure in which a first layer containing cation A and a second layer containing cation B and anion X are alternately stacked, and comprising a nanocrystalline plate having ligands that exist by substituting at least a portion of cation A, wherein the aspect ratio, which is a rectangular shape feature in a direction intersecting the stacking direction of the composite layer structure, is 0.2 or more and 5 or less, and the superlattice structure has superlattice peaks in the diffraction angle range of ±5 degrees that straddles the main diffraction peak of the X-ray diffraction profile by the 2θ method.

The application discloses a kind of perovskite nanowires and preparation method and application thereof.The preparation method of perovskite nanowire of the application includes the following steps: 1) CsBr, PbBr2 and trimesic acid are dissolved in polar aprotic solvent to obtain precursor solution;2) precursor solution and oleylamine are dispersed in non-polar solvent to react, then product separation, purification and drying are carried out to obtain perovskite nanowire.The perovskite nanowire of the application has [100] preferred orientation single crystal nanowire structure, and has less surface defects, high carrier transport efficiency, strong resistance to water and oxygen and light, simple preparation process, low production cost, the long-term stability of ultraviolet photodetector made of it is excellent, suitable for large-scale industrial production and application.

The invention relates to the technical field of nano material preparation, and discloses formamidine acetate doped CsPbBr3 perovskite nanocrystals and a water phase preparation method thereof.The method comprises the steps that firstly, lead bromide, cesium bromide, formamidine acetate and dimethylacetamide are mixed, and a uniformly-doped precursor solution containing formamidine acetate is prepared under the ultrasonic concussion condition; sequentially adding oleylamine and 5-bromovaleric acid into the precursor solution according to a specific sequence, and carrying out ultrasonic-assisted in-situ surface ligand modification; and finally, rapidly injecting the precursor solution into deionized water, inducing crystallization by using the polarity difference of the solvent, centrifuging to remove the precipitate, and taking the supernatant to obtain the target product. According to the preparation method disclosed by the invention, the structural stability of the CsPbBr3 nanocrystal is remarkably improved through doping of formamidine acetate (FA) to a lattice A site and synergistic coordination of acetate. The obtained nanocrystal has a cubic crystal phase structure and can be stably dispersed in a water phase system, and the technical problem that a traditional perovskite material is easy to decompose when meeting water is solved.

The invention relates to the field of semiconductor materials with photoelectric functions, in particular to a synthesis method of a perovskite precursor material. According to the synthesis method of the perovskite precursor material, the waste liquid treatment step is added, the waste liquid treatment step is based on the synthesis step of the precursor material, lead-free emission and high lead element recovery rate are achieved, the preparation process is completely carried out in a conventional air environment, and extra environment control cost is avoided; no organic solvent is needed in the preparation process, and the solvent for washing can be completely recycled theoretically, so that the cost and environmental pollution are reduced; the lead element is recycled after preparation, so that the pollution is reduced while the cost is saved, and nearly complete utilization of the lead element can be realized in the circulation process; the prepared perovskite precursor is good in performance; the steps are simple and easy to industrialize.

This invention discloses a method for preparing cerium-doped CsPbBr3 perovskite clusters (PMSCs) and their application in antibacterial hydrogels, belonging to the field of perovskite cluster technology. The method includes: dissolving PbBr2, CsBr, and CeBr3 in a polar aprotic solvent to obtain a metal halide precursor solution; adding carboxylic acid ligands and amine ligands to the precursor solution, mixing and filtering to obtain a precursor filtrate; preparing cerium-doped CsPbBr3 PMSCs through a reprecipitation reaction, and further performing hydrophilic modification or combining with a hydrogel matrix to obtain an antibacterial hydrogel material. 3+ Doping and ligand-assisted passivation can reduce deep-level trap density, suppress nonradiative recombination, and improve the interfacial reactivity of materials. Simultaneously, ligand shell protection and interfacial encapsulation help enhance the structural and optical stability of materials under high humidity and aqueous conditions, reducing the risk of cluster aggregation and structural reconstruction. This method has the advantages of mild conditions, simple process, and promising application prospects.

The application discloses a Pb5S2I6 nanowire self-assembled film, a preparation method of the Pb5S2I6 nanowire self-assembled film and application of the Pb5S2I6 nanowire self-assembled film in a two-factor fire alarm. The Pb5S2I6 nanowire self-assembled film is formed by self-assembly of Pb5S2I6 nanowires with an average diameter of 70-150 nm, and has photoelectric performance. The self-assembled film can be made into a photoelectric gas sensitive sensor device, and further judgment of a smoke signal in a fire is realized on the basis of gas sensing in the fire through photoelectric response characteristics of the device. That is, a fire warning can be caused by a double factor of gas and smoke, and the accuracy of the alarm is greatly improved.