18 results about "Cadmium selenide" patented technology

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.

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 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.

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 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 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 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.

A dye-sensitized solar cell (DSSC) includes a photoanode including a layer of a titanium dioxide, a graphitic carbon nitride, and a cadmium selenide (TiO2 / GCN / CdSe) nanocomposite, a layer of a light absorbing dye, and a transparent glass substrate on which the TiO2 / GCN / CdSe nanocomposite layer and the light absorbing dye layer are coated. The DSSC further includes a counter electrode including a layer of electrically conductive material and a transparent glass substrate, the electrically conductive material is coated on the transparent glass substrate, and an electrolyte between the photoanode and the counter electrode. The TiO2 / GCN / CdSe nanocomposite includes TiO2 in an amount of 75 to 95 percent by weight (wt. %), GCN in an amount of 5 to 10 wt. %, and CdSe in an amount of 2 to 7 wt. %, based on the total weight of the TiO2 / GCN / CdSe nanocomposite.