500 results about "Cadmium sulphide" patented technology

The invention discloses a g-C3N4 nanosheet/CdS composite visible-light-driven photocatalyst and a preparing method and application thereof and belongs to the technical field of material preparation and photocatalysis. The catalyst is directly obtained with the solvothermal method by taking two-dimensional ultra-thin g-C3N4 nanosheets as the matrix, cadmium acetate dihydrate and thioacetamide as raw materials, and ethyl alcohol as the solvent. Compared with general block g-C3N4/CdS, the two-dimensional ultra-thin g-C3N4 nanosheet/CdS composite photocatalyst prepared with the method has the advantages that the two substances are in tighter contact, the specific surface area is larger, photon-generated electron-hole can be better separated, and photocatalytic efficiency is higher. Under the shining of sunlight, the composite photocatalyst enables catalytic degradation of organic pollutants such as methyl orange in water to be achieved well. The preparing method is easy, raw materials are easy to obtain, visible light catalysis efficiency is high, and the application prospect is wide in the photocatalysis field.

The invention provides a preparation method of an active radical with a surface-enhanced Raman scattering (SERS) effect, belongs to the technical field of spectrum detection, and relates to the preparation technology of the SERS active radical, which is rapid, has high sensitivity and performs a low trace detection function. The preparation method is characterized in that firstly, a nano porous silicon columnar array with a large specific surface area is prepared by utilizing a hydrothermal etching technology; afterwards, a nanowire structure of an II-VI group compound semiconductor (such as zinc oxide, titanium dioxide, cadmium sulfide, cadmium selenide, cadmium telluride, and the like) by utilizing a chemical vapor deposition method; and finally, nano particles of precious metal (such as gold, silver, copper and the like) are finally prepared on the nanowire structure by using a chemical reduction method, so as to obtain an active radical material. The preparation method has a wide application prospect in the aspects of clinical biomolecular fast recognition, trace chemical substance detection, biological sample analysis, and the like. The preparation method has the advantages that the preparation process of each material is simple, the condition is mild and the repetition rate reaches 100 percent.

The invention discloses a composite photo-catalyst with a molybdenum disulfide (MoS2) nanosheet/ cadmium sulfide (CdS) nanowire core-shell structure, and a preparation method of the composite photo-catalyst, belonging to the technical fields of material preparation and photo-catalysis. The composite photo-catalyst takes a one-dimensional CdS nanowire as a core and takes a two-dimensional MoS2 nanosheet as a shell, and is compounded by an electrostatic self-assembly method through a hydrothermal process. The raw materials of the composite photo-catalyst can be easily obtained, and the preparation method is simple in process and convenient to operate; the prepared composite material with the core-shell structure is better in stability, has excellent photocatalytic activity and can be used for catalyzing photolysis of water for preparing hydrogen; furthermore, the core-shell structure is capable of effectively preventing the sulfur loss of the CdS nanowire and slowing down photocorrosion, and has wide application prospect in the field of photo-catalysis.

The invention relates to a method for detection Listeria monocytogenes with loop-mediated isothermal amplification-CdS nanoparticles labeling electrochemistry. The method is characterized in that the method comprises the following steps of: obtaining double-stranded target sequence of amplification reagent-Listeria monocytogenes to be detected by means of loop-mediated isothermal amplification reaction; pyrolyzing a double-stranded target sequence in water bath into a single-stranded target sequence, then self assembling and fixing at the surface of gold electrode, so that the target sequence modified electrode of the Listeria monocytogenes to be detected is obtained; afterwards, labeling the probe sequence coming from the Listeria monocytogenes by CdS nanoparticles to obtain a labeled probe sequence; carrying out molecular hybridization on the labeled probe sequence and the target sequence of the target sequence modified electrode, and carrying out electrochemical detection by simultaneity plating Hg anodic stripping method; detecting out cadmium ions corresponding to the species-specific genes (actA) of the detected Listeria monocytogenes. The method has the advantages of speediness, strong specificity, high sensitivity and convenient use.

The invention discloses a preparation method and application of a cadmium sulfide/graphite like carbon nitride (CdS/g-C3N4) composite visible light catalyst. The preparation method of the catalyst is a chemical precipitation method which is performed in an alkaline environment, wherein g-C3N4 is taken as a matrix, and CdCl2 and Na2S are taken as raw materials. The weight ratio of CdS to g-C3N4 in CdS/g-C3N4 is (1:2)-(5:1), and when the composite visible light catalyst is used for visible light catalysis treatment of methylene blue and methyl violet solutions, a better degradation effect can be obtained; and furthermore, the catalyst can still keep higher catalytic activity after being reused for five times. The composite visible light catalyst disclosed by the invention has important significance for development of the visible light catalyst, and also has good application prospects in treatment of dye wastewater.

The invention provides photocatalyst Cd/CdS containing catalyst promoter Cd, which is obtained by uniformly attaching single-substance metal Cd on the surface of CdS, and belongs to the technical field of photocatalysis. The metal single-substance Cd in cadmium sulfide CdS is the catalyst promoter, so that photo-generated electrons and electron-hole pairs can be effectively separated, the photocatalysis hydrogen production efficiency of the CdS is greatly improved, and the application of the CdS in photocatalysis water decomposition hydrogen production reaction is expanded; efficient photocatalyst Cd/CdS is directly synthesized by adopting a photochemical method, so that the structure and the performances are relatively stable, and the efficient photocatalyst Cd/CdS can be recycled in the photocatalysis water decomposition hydrogen production reaction. Besides, the synthetic method of the photocatalyst Cd/CdS is simple, lower in cost, high in yield and good in industrial prospect.

The invention discloses a preparation method of a semiconductor nano-wire-based organic/inorganic composite solar cell, belonging to the technical field of new energy resources. The method is characterized by comprising the following steps: preparing nano silicon with good light absorption performance in a visible light area by an electrochemical corrosion or hydrothermal corrosion technology; growing a zinc oxide or titanium dioxide or cadmium selenide nano-wire array on the nano silicon substrate by a high-temperature chemical vapor deposition method or low-temperature liquid phase chemical method; spinning poly-3-hexylthiophene (P3HT) or poly[2-methoxy-5-(2-ethyhexyloxy)-1,4-p-phenylene vinylene] (MEH-PPV) or poly(3-octylthiophene) (P3OT) on the nano-wire array to form a three-layer composite structure system; and finally preparing a magnesium fluoride or calcium fluoride surface anti-reflection film and metal film electrode to form a solar cell device. The process disclosed by the invention is simple, the operation is simply and easily implemented, the preparation conditions are mild, the repetition rate reaches 100%, and the prepared organic/inorganic composite material system is an important material for manufacturing a full-silicon-based solar cell device in the future.

The invention relates to a preparation method for a metal organic framework material UIO-66 (NH2) doped rodlike cadmium sulfide (CdS NRs) composite photocatalyst. The preparation method comprises thefollowing steps: preparation of rodlike cadmium sulfide (CdS NRs), preparation of UIO-66 (NH2) and preparation of a UIO-66 (NH2) doped rodlike cadmium sulfide (CdS@UIO-66 (NH2)) composite photocatalyst. The invention has the following beneficial effects: the preparation method is simple; preparation conditions are easily controllable; and the UIO-66 (NH2) doped rodlike cadmium sulfide (CdS NRs) composite catalyst prepared by using the preparation method provided by the invention has the advantages of no secondary pollution, high photocatalytic efficiency, certain application values, etc.

The invention discloses a method and a device for preparing a cadmium selenide sulfide nano material with monotonous and continuous variable band gap. According to the preparation method, based on a vapor deposition method, the positions of a cadmium sulfide quartz boat and a cadmium selenide quartz boat in a tubular high-temperature furnace are adjusted through a magnet to continuously adjust the vapor concentration ratio of cadmium sulfide to cadmium selenide during growing the nano material so as to realize monotonous continuous transition of the band gap on the same nano band or nano wire. The preparation method is simple and low in cost; the ratio of sulfur element to selenium element on the prepared single nano material can be continuously transited to 0: 1 from 1: 0; and the nano material has potential application value in the fields of tunable lasers, wideband lasers, white light LEDs, wide spectrum detectors and the like.

In the method, two phases system is formed under following condition: cadmium alkyl carboxylic acid containing 2-18 carbon or cadmium oxide as cadmium source; thiourea or thioacetamide as sulphur source; oleic acid or three octyl phosphine oxide (TOPO) as package agent; water in equivolume and organic compound not dissolved in water as solvent; heating 0.5-24 hours inside autoclave under 120-180 deg.C. Quantum points of cadmium sulphide in different sizes are obtained by changing reaction time. Or, quantum point near to size distribution of crystal seed in larger size is obtained by using obtained quantum point as crystal seed through reaction with new added reactive precursor. The invention realizes controllable size of quantum point, obtains quantum points in narrow distributed sizes. Light in royal purple or blue color is radiated under ultraviolet lamp. quantum efficiency is 3-60%.

The invention relates to a preparation method of a photoelectrochemical sensor for detecting dexamethasone based on in-situ generation of cadmium sulfide. The method specifically comprises the following steps: as carboxylated carbon nitride and bismuth sulfide are taken as substrate materials, and labeling a dexamethasone antibody by using titanium dioxide subjected to cadmium ion functionalization. Sodium sulfide is directly dropwise added to the electrode surface, a narrow band-gap cadmium sulfide semiconductor nanometer material with the high photoelectric conversion efficiency is generated in situ, and a photocurrent signal is generated under light source irradiation with visible wavelength. A porous titanium dioxide carrier and a cadmium sulfide energy band are well matched, so that the photoelectric conversion efficiency of the cadmium sulfide is improved, the high-sensitivity detection of dexamethasone is realized, and the detection limit is 2pg/mL.

The invention provides a ferroferric oxide/carbon/cadmium sulfide composite nano material and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing one-pack-one Fe3O4@C nano particles with good monodispersity by using a hydrothermal process, wherein the 'one-pack-one' means that one Fe3O4@C nano particle is only wrapped in one carbon layer; then obtaining Fe3O4@C@Cd<2+> by means of simple adsorption; and finally forming Fe3O4@C@CdS nano particles by adopting a microwave method. Compared with the prior art, the preparation method provided by the invention is simple in process and easy to operate; the prepared material has the characteristics of proper size, uniform structure, relatively strong magnetism and good photocatalysis effect; the material has a uniform spherical core-shell structure, is relatively good in dispersity in a solution, can perform a photocatalysis action under the irradiation of visible light; and because the composite nano material has magnetism, the composite nano material can be recycled for multiple times by using a magnet.

The invention discloses a CD (carbon dot)/CdS quantum dot/C3N4 catalyst and a preparation method thereof. The catalyst is prepared from CDs synthesized with an electrochemical method, CdS quantum dotssynthesized with a solvothermal method and g-C3N4 (graphene-like carbon nitride) synthesized with a calcination method. Under the simulated sunlight, the catalyst can efficiently and stably promote photocatalytic decomposition of water to produce hydrogen and also can catalyze and oxidize organic pollutants such as p-nitrophenol and the like. The catalyst has the advantages as follows: 1, the photoresponse range of a heterojunction catalyst is broadened through loading of the CDs, and absorption under visible light is improved; 2, the light utilization rate is increased by use of the upconversion effect of the CDs and the electron conduction capability; 3, the CdS quantum dots have moderate forbidden bandwidth, more photon-generated carriers are produced, and besides, combination of photo-generated electrons and holes is inhibited and the light utilization rate can be increased by use of the ultrahigh electron conduction capability of the CdS quantum dots.

The invention relates to a preparation technology of a photocatalyst, and in particular relates to a preparation method of a photocatalyst taking silicon carbide as a carrier. The preparation method comprises the following steps of: (1) weighing the silicon carbide, adding a sulfourea solution into the weighed silicon carbide, evenly stirring, dripping a cadmium chloride solution into the mixture to obtain a mixed solution, adjusting the pH of the mixed solution to be 8-10 by an NaOH solution, and carrying out reflux at 100 DEG C for 8h-12h; (2) after reflux, respectively washing the sample by distilled water and ethyl alcohol, drying the sample for 3h-5h at 60 DEG C, and then drying the sample again to constant weight at 120 DEG C to obtain the photocatalyst taking the silicon carbide as the carrier, wherein the content of cadmium sulfide in the photocatalyst accounts for 9%-50% of the total weight of the photocatalyst. The photocatalyst prepared by the method is good in stability, has good thermal conductivity, can effectively transfer reaction heat in catalytic reaction, and has good mechanical strength and hardness and good thermal conductivity and electrical conductivity.

The invention discloses a one-dimensional cadmium sulfide nanorod catalyst, and a preparation method thereof and an application thereof in producing hydrogen through acoustic catalytic cracking of water. The catalyst has a wurtzite crystal structure, and is non-centrosymmetric crystal. The catalyst satisfy the structural condition of piezoelectric crystal. The specially oriented nanorod shape of the catalyst can enrich environmental soundwave energy through piezoelectric effect, such that negative charge is produced on the surface of the nanorods. Therefore, pure water cracking is catalyzed, and hydrogen gas is produced. The preparation method mainly relates to a one-step solvothermal method. Cadmium sulfide growth orientation is regulated with the coordination or chelation effect of crystal seeds and diethylenetriamine solvent molecules, and the one-dimensional nanorod morphology is obtained under appropriate reaction temperature and reaction time conditions. The activity of the obtained cadmium sulfide nanorods for cracking pure water to produce hydrogen under sound driving is substantially higher than those of nano-flake wurtzite-type cadmium sulfide sample, micro-spherical wurtzite-type cadmium sulfide sample, and nanorod wurtzite-type cadmium sulfide samples obtained with a traditional two-step synthesis method. The cadmium sulfide nanorod catalyst provided by the invention has a good application prospect in the field of sound energy-hydrogen energy conversion. The preparation method is simple to operate, and is suitable for industrialized production.

The invention relates to a CdSeS solid solution quantum dot and a preparation method and photocatalytic hydrogen production application thereof. The preparation method of the cadmium sulphide selenide solid solution quantum dot includes the steps that 1, a Na2SeSO3 solution is prepared, wherein selenium powder flows back in a water solution of sodium sulfite, and the Na2SeSO3 solution is obtained; 2, CdSe quantum dot suspension liquid is prepared, wherein (CH3COO)2Cd.2H2O is dissolved in distilled water, the pH value of the solution is adjusted to be 11 with alkali liquid, nitrogen is introduced for 30 min, mercaptoacetic acid and the Na2SeSO3 solution are added in the nitrogen atmosphere, a reaction is conducted for 1 h at normal temperature, the reaction is conducted for 40-60 min at the temperature of 40-60 DEG C, and the water-soluble CdSe quantum dot suspension liquid is obtained; 3, the water-soluble CdSe quantum dot suspension liquid, Na2S and Na2SO3 are added into distilled water, the obtained mixture is ultrasonically dispersed and continues to be subjected to a stirring reaction, and the CdSeS solid solution quantum dot is obtained.

The present invention discloses an ordered structure array of two-dimensional hollow balls and a preparing method thereof. The array is a single-layer hollow ball array which is provided with an ordered hexagonal arrangement on a substrate. The outer diameter of each hollow ball in the single-layer hollow ball array is 220nm-10.8mu m. An outer surface of each ball is a rough surface. Each hollow ball is composed of a gold metal inner surface and metal gold or polypyrrole or zinc oxide which is coated on the gold metal inner surface. The rough surface is composed of particle-shaped objects or vertical rod-shaped objects. The method comprises the following steps: performing ion sputtering on a conductive substrate which is provided with a single-layer colloid crystal template for depositinga gold film and obtaining a gold film wall array; then placing the conductive substrate which is adhered with the gold film array into electrolyte; performing electrodeposition for 10s-3h with a deposition current density of -1.0-1.0Ma/cm2 for obtaining a complex array; then placing the complex array into a dichloromethane solvent for removing polystyrene colloid balls and preparing the ordered structure array of the two-dimensional hollow balls. The ordered structure array of the two-dimensional hollow balls can be widely used for the following fields: medicament engineering, cosmetic, biotechnology, photocatalysis, photonic device, etc.

The invention discloses a TiO2/CdS perovskite solar cell and a preparation method thereof. The structure of the perovskite solar cell sequentially comprises a conductive glass FTO substrate, an electron transmission layer, a light absorption layer, a hole transmission layer and a silver electrode from bottom to top, wherein the electron transmission layer is a cadmium sulfide/titanium dioxide shell-core structure nanowire array, the light absorption layer is a perovskite material, and the hole transmission layer is Spiro-OMeTAD. According to the TiO2/CdS perovskite solar cell and the preparation method thereof, provided by the invention, a titanium dioxide nanorod array is prepared by a hydrothermal method, cadmium sulfide is deposited on the titanium dioxide nanorod array by a normal-temperature chemical water bath deposition method to form a uniform cadmium sulfide/titanium dioxide shell-core structure electron transmission layer, and the light absorption layer, the hole transmissionlayer and the silver electrode are sequentially fabricated. The fabrication process is simple, the cost is low, the equipment requirement is low, and the efficiency and the stability of the cell canbe improved when the material is applied to a perovskite solar cell.