34 results about "Cadmium selenide" patented technology

The application relates to the technical field of photovoltaic cells and discloses a tellurium cadmium selenide film near-space sublimation deposition method and equipment, wherein the tellurium cadmium selenide film near-space sublimation deposition method comprises the following steps: a cadmium selenide heating chamber is used to heat cadmium selenide raw materials, a first gaseous reaction precursor is obtained, the heating temperature is T1, a cadmium telluride heating chamber is used to heat cadmium telluride raw materials, a second gaseous reaction precursor is obtained, the heating temperature is T2, T1>T2 is met, the first gaseous reaction precursor is introduced into a mixing chamber through a first gas outlet pipe, the second gaseous reaction precursor is introduced into the mixing chamber through a second gas outlet pipe, mixed gas is obtained in the mixing chamber, the mixed gas is transported to a nozzle through a connecting pipe, and the nozzle is sprayed towards a substrate, so that a tellurium cadmium selenide film is formed on the surface of the substrate. The cadmium selenide and the cadmium telluride binary alloy are used for near-space sublimation deposition, the stability of the tellurium cadmium selenide film can be remarkably improved, and the photoelectric conversion efficiency of the cell is improved.

The application belongs to the field of inorganic semiconductor material synthesis, and particularly relates to a preparation method and application of large-size two-dimensional cadmium selenide nanosheet, wherein the preparation method is to select cadmium acetate and selenium powder as solutes, mix them uniformly with amine as a solvent, and then heat to controllably synthesize two-dimensional wurtzite cadmium selenide nanosheet with ultraviolet absorption peaks of 429 nm, 456 nm and 485 nm, 518 nm; the application avoids high-temperature and high-pressure operation by controlling reaction conditions, and obtains a convenient preparation method of cadmium selenide nanosheet by selecting suitable raw materials, thereby solving related problems existing in the synthesis of cadmium selenide nanosheet; the preparation method has low cost and wide application range, the prepared cadmium selenide nanosheet has excellent optical performance in addition to different thicknesses obtained by changing temperature and reaction time, and can be widely applied in the fields of biological sensing and photocatalysis.

The invention discloses a carbon nanotube / cadmium selenide quantum dot heterojunction photoelectric catalyst as well as a preparation method and application thereof. The method comprises the following steps: activating single-wall and / or multi-wall carbon nanotubes by aqua regia at room temperature, dispersing the single-wall and / or multi-wall carbon nanotubes in an aqueous solution containing CdCl2. 5H2O, adding a Na2SeSO3 selenium source and 3-mercaptopropionic acid, and reacting at 110-150 DEG C, so that CdSe quantum dots with the particle size of 1-5 nm are subjected to in-situ nucleation growth on the surfaces and / or the interiors of the carbon nanotubes and form a heterojunction interface. The obtained catalyst and Nafion are prepared into ink drops, the ink drops are coated on conductive glass to construct a photocathode, in an H-type electrolytic tank with a light path, a high-purity CO2 saturated bicarbonate aqueous solution is used as an electrolyte, Ag / AgCl is used as a reference electrode, and under irradiation of an LED light source with the maximum wavelength being 450 nm and bias voltage ranging from-0.1 V (vs. RHE) to-1.0 V (vs. RHE), CO is generated through water-phase photoelectrocatalysis CO2 reduction. The photoelectrocatalyst has the characteristics of simple synthesis method and excellent photoelectrocatalytic reduction effect of carbon dioxide.

This invention discloses a method for preparing vicinal diamine derivatives, belonging to the field of pharmaceutical intermediates and organic synthesis technology. Specifically, under an inert atmosphere, an aldehyde imine, an N-aryl tertiary amine, a base, a cadmium selenide quantum dot catalyst, and a solvent are mixed and reacted under blue light irradiation for 8-24 hours. After extraction with ethyl acetate and saturated brine, the organic phase is collected, dried, the solvent is removed by vacuum distillation, and purified by column chromatography to obtain the vicinal diamine derivatives. The vicinal diamine derivatives synthesized by this invention can be used as synthetic intermediates and metal ion chelating agents in drug synthesis and fine chemical industries.

Systems and methods for providing alternative fuel, in particular hydrogen photocatalytically generated by a system comprising photoactive nanoparticles and a nitrogenase cofactor are provided. In one aspect, the system includes a water soluble cadmium selenide nanoparticle (CdSe) surface capped with mercaptosuccinate (CdSe-MSA) and a NafY.FeMo-co complex comprising a NafY protein and an iron-molybdenum cofactor (FeMo-co), wherein the CdSe-MSA and NafY·FeMo-co complex are present in about 1:2 to 1:10 molar ratio.

The application discloses a phosphorus-doped cadmium selenide target material and a preparation method thereof, and belongs to the technical field of semiconductor materials. In the application, cadmium powder and red phosphorus powder are uniformly mixed, and then are subjected to two-stage heating and heat preservation treatment at a specific temperature to obtain cadmium phosphide powder suitable for preparing the phosphorus-doped cadmium selenide. Then, the cadmium phosphide powder is uniformly mixed with cadmium selenide powder, is put into a vacuum hot-pressing furnace, and is subjected to two-stage heating and heat preservation treatment at a specific pressure and temperature. Then, the mixture is hot-pressed, and finally is cooled to room temperature to obtain the phosphorus-doped cadmium selenide target material. The phosphorus-doped cadmium selenide target material has high relative density, uniform composition, a surface without defects, no pores and white spots, and low contents of free substances and oxygen.

The application provides a bimetallic sulfide modified cadmium selenide photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalytic hydrogen production. The application prepares cadmium selenide / copper molybdenum sulfide by hydrothermal reaction of copper molybdenum sulfide and cadmium selenide. The application successfully prepares cadmium selenide / copper molybdenum sulfide (CdSe / Cu2MoS4) with high purity and good crystallization by adopting a solvothermal synthesis method (hydrothermal reaction); the cadmium selenide (CdSe) is successfully modified by a method of constructing a heterojunction, and the photocatalytic hydrogen production performance is greatly improved, a new path is provided for modifying existing photocatalysts, and new impetus is injected into the development of photocatalytic hydrogen production technology.

The present invention discloses a photoelectrochemical biosensor for detecting Cyfra21-1 and its preparation method. The biosensor comprises a titanium carbide / graphite-like carbon nitride / cadmium selenide quantum dot nanocomposite fixed to the surface of an FTO glass electrode. A probe sequence is fixed to the surface of the nanocomposite. The probe sequence partially binds to a single-stranded nucleic acid sequence, which is connected to a signal amplification factor via its terminal modification group. The present invention achieves detection of Cyfra21-1 using a photoelectrochemical biosensor, which is simple, highly sensitive, and easy to operate.

The invention relates to the technical field of food detection, in particular to a method for detecting the peroxide value in animal fat based on quantum dot fluorescence, which comprises the following steps: dissolving animal fat to be detected with an organic solvent to obtain a clear solution; the cadmium selenide quantum dot fluorescent probe with high quantum yield is prepared by heating and refluxing a sulfenyl compound, a cadmium source and a selenium source in a water phase according to a specific ratio. Mixing a quantitative probe and a hydrogen peroxide standard solution with known concentration in a buffer solution to form a gradient solution, measuring the initial fluorescence intensity under a specific excitation wavelength, and measuring the intensity after reaction after a preset temperature duration reaction; calculating the intensity difference value of each concentration point, drawing a standard curve fitting equation by taking the difference value as a longitudinal axis and the concentration as a transverse axis, and obtaining the peroxide value of the sample based on the equation. According to the method, rapid and accurate detection of the peroxide value of the animal fat is realized through water-phase synthesis of a high-activity probe and quantification of fluorescence intensity difference before and after reaction.

A method of generating hydrogen gas including applying a potential of greater than 0 to 1.0 volts (V) to an electrochemical cell. The electrochemical cell is at least partially submerged in an aqueous solution. On applying the potential the aqueous solution is reduced thereby forming hydrogen gas. The electrochemical cell includes an electrocatalyst and a counter electrode. The electrocatalyst includes a substrate, strontium titanate (SrTiO3) nanoparticles, and cadmium selenide (CdSe) nanoparticles. The SrTiO3 nanoparticles have a substantially spherical shape. The CdSe nanoparticles have a polygon shape. The CdSe nanoparticles are distributed within a network of the SrTiO3 nanoparticles on the surface of the substrate.

The invention relates to a slurry for compounding graphene on the surface of a cutter and a preparation method, and the slurry comprises the following components in percentage by weight: 40-60% of water-based hydroxy acrylic acid-polyurethane hybrid emulsion, 0.5-2% of hydroxylated few-layer graphene, 0.1-0.3% of cadmium selenide / zinc sulfide core-shell structure quantum dots (surface carboxylation), 5-15% of plasma microcapsules and the balance of water. The water-based polyurethane adhesive is prepared from the following components in percentage by weight: 2 to 4 percent of water-based aliphatic polyisocyanate, 0.2 to 0.3 percent of polyvinylpyrrolidone, 0.2 to 0.3 percent of sodium carboxymethyl cellulose and 0.1 to 0.3 percent of high-molecular-weight ammonium polyacrylate. Before use, the water-based aliphatic polyisocyanate is added and defoamed, and the water-based aliphatic polyisocyanate is applied to the surface of a cutter by silk-screen printing or spraying. The invention is suitable for the coating-curing technology of the surfaces of metal, ceramic and superhard cutters, the film-substrate adhesion fastness reaches 0 level in (GB / T 9286), and the friction coefficient is less than or equal to 0.12.

The invention provides a bimetallic sulfide modified cadmium selenide photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic hydrogen production. The cadmium selenide / copper molybdenum sulfide is prepared by hydrothermal reaction of copper molybdenum sulfide and cadmium selenide. According to the invention, cadmium selenide / copper molybdenum sulfide (CdSe / Cu2MoS4) with high purity and good crystallization is successfully prepared by adopting a solvothermal synthesis method (hydrothermal reaction); cadmium selenide (CdSe) is successfully modified through a heterojunction construction method, the photocatalytic hydrogen production performance of the cadmium selenide is greatly improved, a new path is provided for modification of an existing photocatalyst, and new power is injected for development of a photocatalytic hydrogen production technology.

The application discloses a modified manganese iron lithium phosphate positive electrode material, a positive electrode sheet, a battery and a preparation method. The modified manganese iron lithium phosphate positive electrode material comprises a manganese iron lithium phosphate base body, a carbon coating layer coated on the surface of the manganese iron lithium phosphate base body and a selenide coating layer coated on the surface of the carbon coating layer. The selenide is selected from a mixture of one or more of copper selenide, cadmium selenide, indium selenide, lead selenide and antimony selenide. The problems of low conductivity, low discharge capacity, poor rate performance, poor cycle retention rate and high manganese dissolution rate of the existing manganese iron lithium phosphate positive electrode material are solved.

This invention belongs to the field of fluorescent probe preparation technology, specifically a method for preparing and applying a water-soluble quantum sheet fluorescent probe, comprising the following steps: Step 1: Disperse purified cadmium selenide quantum sheets in a hexane solution, add cadmium octanoate, and shake in a centrifuge tube for 10 min to obtain quantum sheets with cadmium octanoate as the surface; Step 2: Centrifuge the cadmium octanoate-surfaced quantum sheets at 6000 r / min for 3 min, and discard the supernatant; Step 3: Add a hexane solution, repeat steps 1 and 2, and place the obtained precipitate in an oven to dry at 40℃; Step 4: Add 1 mL of a 1% amphiphilic aqueous solution to the dried precipitate, and sonicate for 15 min to obtain a uniformly dispersed quantum sheet aqueous solution; This invention is water-soluble and can be directly synthesized in water, which is more conducive to practical applications. Furthermore, by adding ligands, the water-soluble quantum sheets of this invention can maintain fluorescence characteristics for about one month.

This invention relates to the field of biomedical technology, specifically proposing a method for preparing chiral cadmium selenide quantum dots and their application in retinal degeneration. By precisely controlling the reaction conditions, highly efficient chiral cadmium selenide quantum dots were successfully synthesized. The chiral cadmium selenide quantum dots of this invention exhibit significant protective effects against retinal damage caused by high intraocular pressure or oxidative stress, effectively improving the survival rate of retinal ganglion cells and alleviating retinal pathological changes. In a rat model, topical ocular administration demonstrated good therapeutic efficacy and biosafety. This invention provides new ideas and methods for the treatment of retinal degeneration and has broad clinical application prospects. Furthermore, the preparation method of these quantum dots and their complexes is simple and low-cost, providing new possibilities for expanding the application of quantum dots in the biomedical field.

This invention relates to the preparation and application of a carbon quantum dot-modified zinc cadmium selenide (ZNDS) sulfide with an embedded dual-field superhydrophilic photocatalyst for hydrogen production via water splitting, belonging to the field of photocatalytic hydrogen production technology. The invention uses citric acid and urea as raw materials to prepare hydrophilic carbon quantum dots via a hydrothermal method. Then, zinc acetate dihydrate, cadmium acetate dihydrate, thioacetamide, and a selenium powder-hydrazine hydrate solution are added to the carbon quantum dot system to achieve the preparation of an amide-bonded carbon quantum dot-modified ZNDS sulfide with an embedded dual-field superhydrophilic photocatalyst via a one-step hydrothermal method. The invention also discloses the application of this photocatalyst in hydrogen production via water splitting. Under the synergistic effect of multiple charge transport channels and photocatalysis-thermal catalysis, the photocatalyst significantly improves the directional separation and migration efficiency of photogenerated carriers, achieving a hydrogen production rate of 103.9~126.8 mmol·g under light-driven and thermally assisted conditions. cat ‑1 ·h ‑1 Furthermore, after eight consecutive uses, the photocatalytic activity remained above 91%. Therefore, the prepared photocatalyst has enormous potential for photocatalytic hydrogen production applications.

The invention discloses a cadmium selenide core-shell quantum dot as well as a preparation method and application thereof, a thermal injection method is adopted as a synthetic preparation scheme, and the preparation method is divided into a nucleation stage and a cladding stage. Compared with a one-pot method, the method has the advantages that the repeatability is high, and the size of the cadmium selenide core quantum dot can be accurately screened. In the nucleation process, a mixed surfactant nucleation strategy is adopted, the cadmium selenide quantum dots with more uniform size distribution are grown by regulating and controlling the amount of the two surfactants, and the crystallinity of the cadmium selenide quantum dots is further improved. Due to the fact that cadmium selenide has a large number of unsaturated key positions, the cadmium selenide generates surface defects, the core-shell structure of the cadmium selenide / zinc cadmium sulfide core-shell quantum dot is designed to passivate the surface of the cadmium selenide core, and the cadmium selenide / zinc cadmium sulfide core-shell quantum dot has higher luminous efficiency and narrower half-wave width. The cadmium selenide quantum dots with the quantum yield larger than 75% and the half-wave width smaller than 30 nanometers can be stably prepared through the thermal injection method, and the cadmium selenide quantum dots can be stably used for large-scale industrial production of photoelectric devices.

The invention relates to the technical field of battery capacity prediction, in particular to a quantum dot composite adhesive film for a solar cell and a preparation method thereof.The quantum dot composite adhesive film sequentially comprises a POE adhesive film, a quantum dot layer and an EVA adhesive film from top to bottom, the POE adhesive film serves as the front surface of the quantum dot composite adhesive film, and the EVA adhesive film serves as the rear surface of the quantum dot composite adhesive film. The thickness of the quantum dot layer is 20-100 nm, the quantum dot layer is made of cadmium selenide quantum dots (CdSe / ZnS) or indium phosphide quantum dots (InP / ZnS), each quantum dot is of a core-shell structure, the inner core is CdSe or InP, and the outer layer is coated with ZnS; the stability of the quantum dot composite adhesive film is greatly improved, and the service life of the quantum dot composite adhesive film can be matched with 25 years of a crystal silicon battery; the preparation is simple and convenient, and is completed by coating and laminating without multi-component melting; the conversion efficiency of the module can be improved from less than 24% to 24.5%, and the module is adaptive to the existing system and can be produced in mass.

The application relates to the technical field of photoelectric sensors, and particularly provides a low-cost moisture-resistant photoelectric detector core and a preparation method thereof. The photoelectric detector core comprises a substrate layer, a cadmium selenide layer arranged on the substrate layer, an electrode layer arranged on the end face of the cadmium selenide layer away from the substrate layer, wherein the electrode layer comprises positive and negative electrode regions arranged in an interdigital manner, a PTFE layer deposited in situ and covering the region of the cadmium selenide layer which is not provided with the electrode layer, and the PTFE layer forms a dense and combined hydrophobic passivation interface with the cadmium selenide photosensitive layer through a magnetron sputtering process. The PTFE layer is used for blocking the penetration of water molecules and passivating the surface defect states of the cadmium selenide photosensitive layer. The water molecules are prevented from being adsorbed and condensed on the exposed semiconductor surface between the electrodes, the surface leakage current channel is cut off, and the baseline drift under a high-humidity environment is reduced. The dangling bonds and defect states on the surface of the cadmium selenide are passivated, the dark current is reduced, the photocurrent is improved, and the photoelectric response performance is improved.

The invention relates to the technical field of photovoltaic cells, and discloses a cadmium telluride selenide thin film near-space sublimation deposition method and equipment, and the cadmium telluride selenide thin film near-space sublimation deposition method comprises the following steps: heating a cadmium selenide raw material by using a cadmium selenide heating chamber at the heating temperature T1 to obtain a first gaseous reaction precursor; the cadmium telluride raw material is heated through a cadmium telluride heating chamber, the heating temperature is T2, and the requirement for T1gt is met; t2, obtaining a second gaseous reaction precursor; introducing the first gaseous reaction precursor into the mixing chamber by using a first gas outlet pipe, introducing the second gaseous reaction precursor into the mixing chamber by using a second gas outlet pipe, and obtaining mixed gas in the mixing chamber; and conveying the mixed gas to the nozzle by using the connecting pipe, and spraying the mixed gas to the substrate through the nozzle so as to form the cadmium telluride selenide film on the surface of the substrate. The cadmium selenide and cadmium telluride binary alloy is adopted for near-space sublimation deposition, the stability of the cadmium selenide thin film can be remarkably improved, and therefore the photoelectric conversion efficiency of the cell is improved.

The invention provides a method for green synthesis of CdSe quantum dots by a low-temperature one-pot method, and relates to the technical field of nano semiconductor materials, and the method comprises the following steps: mixing cadmium oxide, selenium powder and long-chain fatty acid in an air atmosphere, adding a non-coordination solvent with a boiling point greater than or equal to 250 DEG C, carrying out a stirring reaction at 160-250 DEG C for 5-180 min, cooling, and purifying to obtain the CdSe quantum dots. The quantum dot synthesized by the method is narrow in half-peak width (24 nm), large in controllable range (485-650 nm) and excellent in performance, and powerful support is provided for wide application of the colloidal cadmium selenide quantum dot in the fields of photoelectric devices, biological imaging, display technologies and the like; and the method is easy for large-scale production, can meet the requirements of industrial large-scale preparation, and has good economic and social benefits.

The application discloses a kind of cadmium selenide quantum dots and preparation method and application thereof, it is related to the technical field of quantum dot synthesis method.A kind of preparation method of cadmium selenide quantum dots includes the following steps: (1) configuration cadmium source solution, then join surface modifier, with strong alkali solution the pH of solution is adjusted to 7-9, again join reducing agent, after being mixed evenly, obtain precursor solution A;(2) configuration selenium source solution as precursor solution B;(3) precursor solution B and precursor solution A are mixed evenly and heated to 80-100 DEG C and keep warm 1-24 h, namely obtain cadmium selenide quantum dots;The molar ratio of reducing agent and cadmium element in cadmium source in step (1) is (1-7):(1-4.5).The application solves the problem that cadmium selenide quantum dot synthesis method in the prior art is difficult to leave nitrogen atmosphere protection, and the water-solubility of product is poor.

The application provides a low-temperature one-pot green synthesis method of CdSe quantum dots, and relates to the technical field of nanometer semiconductor materials, wherein cadmium oxide, selenium powder and long-chain fatty acid are mixed under an air atmosphere, a non-coordination solvent with a boiling point of greater than or equal to 250 DEG C is added, and stirring reaction is carried out at 160-250 DEG C for 5-180 minutes; and CdSe quantum dots are obtained after purification after cooling. The synthesized quantum dots have a narrow half-peak width (24 nm) and a large controllable range (485-650 nm), and have excellent performance, thereby providing strong support for the wide application of colloidal cadmium selenide quantum dots in the fields of optoelectronic devices, biological imaging and display technology; and the method is easy to scale up, can meet the needs of industrial large-scale preparation, and has good economic and social benefits.

A photovoltaic device includes a substrate structure and a p-type semiconductor absorber layer. A photovoltaic device may include a CdSeTe layer. A process for manufacturing a photovoltaic device includes forming a CdSeTe layer over a substrate. The process includes forming a p-type cadmium selenide telluride absorber layer.

The invention belongs to the technical field of cadmium telluride solar cells, and particularly relates to a cadmium telluride solar cell. Comprising a substrate and a transparent conductive oxide layer, a window layer, a cadmium telluride absorption layer, a back contact layer and a back electrode layer which are sequentially stacked on the substrate, a sulfur selenide passivation layer is arranged between the window layer and the cadmium telluride absorption layer, the chemical general formula of the material of the sulfur selenide passivation layer is MSeS, and M is selected from at least one of Mo, Fe and W. According to the cadmium telluride solar cell, the sulfur selenide passivation layer is arranged between the window layer and the cadmium telluride absorption layer, weak chemical bonds are formed between the sulfur selenide passivation layer and Cd < 2 + > on the surfaces of cadmium selenide and cadmium telluride, interface defects are eliminated, and the photoelectric conversion efficiency of the cadmium telluride solar cell can be effectively improved.

The invention discloses a preparation method of a lead selenide dual-band photoconductive infrared detector. The preparation method comprises the following steps: 1) preparing a lead selenide film on a substrate by using a molecular beam epitaxy / pulse laser deposition growth method; 2) photoetching a single-point pixel on the surface of the lead selenide film; 3) sputtering electrodes at two ends of the pixel; and 4) spin-coating and depositing a quantum dot cadmium selenide film on the surface of the lead selenide film without the electrode. By introducing the CdSe quantum dots and adopting a composite preparation process, original PbSe light guide detection is structurally improved, high-quality integration of PbSe and CdSe materials in a heterostructure is realized, the interface quality of a device is improved, and the service life of a carrier is prolonged. Through a combined process of MBE and spin coating, a PbSe / CdSe heterojunction interface is stable in formation, a response wave band is expanded to visible light from mid-infrared light, and the overall response speed of the device is improved.

The invention relates to a preparation method of cadmium selenide quantum dots, which is characterized in that according to the preparation method, selenium powder is dissolved in a tributylphosphine solution to serve as a selenium precursor, cadmium stearate serves as a cadmium precursor, octylamine is introduced to serve as a second ligand, and the double-ligand cadmium selenide quantum dots with the ligand being octylamine / tributylphosphine are obtained. The preparation method of the material comprises the following steps: dissolving selenium powder into tributylphosphine to serve as a selenium precursor; dissolving cadmium stearate in octadecene to serve as a cadmium precursor; when the reaction temperature reaches 250 DEG C, rapidly injecting a selenium precursor to obtain a cadmium selenide quantum dot stock solution with tributylphosphine as a ligand; then carrying out in-situ purification, injecting octylamine at 50 DEG C, stirring for 5 minutes, then injecting normal hexane and methanol, and stirring for 2.5 minutes; and extracting a methanol layer by using an injector, and repeatedly extracting and purifying for three times to obtain the double-ligand cadmium selenide quantum dot with the ligand being octylamine / tributylphosphine. The cadmium selenide quantum dots prepared by the method have wide application prospects in the aspects of fluorescence imaging, luminescent devices and the like.

The present invention discloses an electrochemical biosensor based on PDDA-enhanced cadmium selenide quantum dots and a preparation method thereof, comprising the following steps: S1. obtaining a polished and cleaned glassy carbon electrode; S2. dripping a mixed solution of cadmium selenide quantum dots and PDDA onto the surface of the glassy carbon electrode, naturally drying at room temperature, and then washing to obtain a modified electrode; S3. dripping an aqueous solution of gold nanoparticles modified with hairpin DNA onto the surface of the modified electrode, incubating at room temperature, and then rinsing to obtain an electrochemical biosensor based on PDDA-enhanced cadmium selenide quantum dots, which has a strong and stable light intensity signal and high sensitivity for detecting circulating tumor DNA of lung cancer.

The application relates to a compact and ordered cadmium selenide quantum well film and a method for preparing an electroluminescent diode, and belongs to the field of semiconductor light emission, display and nanotechnology. The application develops a method for obtaining a compact and ordered colloidal quantum well film by using a film preparation technology of two-phase solution repulsion mechanism. The colloidal quantum well is placed into an ethylene glycol solution, then a transparent conductive substrate with a hole injection layer and a transmission layer is immersed into the ethylene glycol solution, and the colloidal quantum well is transferred to the transparent conductive substrate. Subsequently, an electron transmission layer is spin-coated, and an electrode is deposited to obtain a quantum well light emitting diode. The compact and ordered quantum well film of the application significantly improves the charge transmission performance of the quantum well film, improves the light emission coupling efficiency of the quantum well, and the external quantum efficiency is more than 25%, the brightness is more than 50,000 nit, and the application shows great development potential in the field of a new generation of light emission and display.

The application belongs to the technical field of biosensors, and particularly relates to a preparation method of a photocatalytic signal amplification electrochemical biosensor for detection of fumonisin B1 and application thereof. The synthetic composite material of graphdiyne-methylene blue-gold nanorod is used as a base material to generate an electrochemical signal; a single-stranded DNA is self-assembled to prepare a DNA tetrahedral nanostructure, the size of the tetrahedron is adjusted by controlling the number of bases, and the probe is controllably assembled on the electrode surface; the cadmium selenide quantum dots connected to the DNA composite structure are used as a signal transduction element to realize amplification of the amount of the fumonisin B1-induced electrochemical signal change by degrading the methylene blue. The electrochemical aptamer sensor constructed in the application is used for detection of fumonisin B1, has high sensitivity and good selectivity, the detection range thereof spans five orders of magnitude, and the detection limit is as low as 0.45fg / mL ‑1 , and remarkable effects are achieved.