68results about How to "Effective doping" patented technology

The invention belongs to the technical field of environmental materials and particularly relates to a photocatalytic material and a preparation method therefor. The preparation method comprises the steps of dispersing anatase-phase nano titanium dioxide into dichloromethane so as to obtain a white suspension, then, dropwise adding isocyanate into the suspension, and carrying out stirring reaction; and adding a cyanamide compound, carrying out stirring reaction, carrying out suction filtration at reduced pressure so as to obtain a titanium dioxide/cyanamide compound, and carrying out calcining and natural cooling, thereby obtaining a nitrogen-doped titanium dioxide/graphite-phase carbon nitride composite material. According to the photocatalytic material and the preparation method therefor, isocyanate serves as a bridging body to combine the cyanamide compound and nano titanium dioxide in the form of chemical bond, carbon nitride is subjected to in-situ growth on surfaces of titanium dioxide particles under high-temperature conditions, and heterojunctions with electron conduction capacity are formed between carbon nitride and titanium dioxide, so that the photocatalytic property of the composite material is improved.

The invention belongs to the technical field of material chemistry, and particularly relates to a macro preparation method for a carbon doped zinc oxide-based visible-light catalyst. The method disclosed by the invention adopts a micro-molecular organic matter combustion-supporting method for macroscopically preparing the carbon commingled zinc oxide-based visible-light catalyst. The preparation principle of the catalyst is that the reaction heat of the combustion of the micro-molecular organic matter at a high temperature is used to realize effective sedimentation and doping of a carbon element in zinc oxide crystals; at the same time, a large number of gases are generated in reaction processes, products can be crushed effectively, so that small-sized carbon doped zinc oxide-based nano particles are obtained, and the macro preparation of the carbon doped zinc oxide-based visible-light catalyst is realized. Prepared nano-powder has the advantages that the dispersibility is good, the particle sizes are small, the sizes are uniform, the visible-light catalytic property is excellent, and the chemical stability is high; at the room temperature of 27 DEG C-33 DEG C and sunlight exposures, the visible-light catalyst can completely degrade an organic dyestuff rhodamine B in 15 minutes, so that the catalyst can be applied to the fields of controlling environmental pollutants and the like.

The invention relates to a K hole doped polycrystalline SnSe and a preparation method therefor, and belongs to the technical field of energy materials. The method comprises the steps: firstly taking high-purity Sn, K and Sn elementary substances as raw materials, and enabling the raw materials to be prepared into compound powder through an improved mechanical alloying method; secondly employing a spark plasma sintering method, and adjusting the mechanical alloying method and the technological parameters of the spark plasma sintering, thereby achieving the effective doping of K elements, and obtaining K hole doped polycrystalline SnSe through preparation, wherein the atomic ratio of Sn: K: Se is equal to (1-x): x: 1, and x is greater than zero but not greater than 0.1. The K hole doped polycrystalline SnSe is low in heat conductivity, and is high in carrier concentration, power factor and ZT value, wherein the heat conductivity can decrease to 0.20W/mK at the temperature of 773K, and the maximum power factor and the maximum thermoelectricity optimum value ZT respectively reach 350 [mu]W/mK2 and 1.08. The method optimizes the thermoelectric performances, is simple and convenient in technology, is low in cost, and is high in practicality.

The invention discloses electrode slurry in contact with a p+ emitter of an N-type solar cell, and relates to the technical field of photovoltaic cells. The electrode slurry comprises the following components in parts by weight: 80-90 parts of conductive silver powder, 0.5-3 part of aluminum powder, 3-8 parts of glass powder, 0.1-2 part of lanthanum-aluminum alloy powder or lanthanum-ytterbium-aluminum alloy powder, 6-10 parts of an organic carrier and 0-2 parts of an auxiliary agent. According to the electrode slurry, an applicant selects the components and the proportion, so that the conversion efficiency can exceed 23.5% after the prepared slurry is applied to the N-type solar cell.

The invention discloses a synthesis method of SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder. According to the invention, BaTiO3 nano-particles are synthesized with a sol precipitation method; SrTiO3 is subjected to secondary nucleation with a hydrothermal method, such that a coating layer is formed; and the SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder is synthesized. With the method provided by the invention, the synthesized nano-particles have small particle size, good dispersion and a significant core-shell structure. Also, because BaTiO3 and SrTiO3 have different interplanar spacings, the two are subjected to lattice distortion at contact interface layers, such that the dielectric constant and piezoelectric constant of BaTiO3 are improved. With the change of the doping amount of Sr, the interplanar spacings of heterojunction show a regular change.

The invention discloses a method for preparing a Fe3O4/SiO2/N-TiO2 magnetic visible-light-induced photocatalyst with nitric acid being a nitrogen source and belongs to the field of photocatalytic materials. A sol-gel method is adopted for synthesizing a Fe3O4/SiO2 binary nano-composite with a core-shell structure, nitric acid serves as the nitrogen source, and a solvothermal method is adopted for preparing a Fe3O4/SiO2/N-TiO2 ternary composite at a low temperature. According to the method, nitric acid serves as the nitrogen source, heteropical deposition and effective nitrogen doping of TiO2 on the Fe3O4/SiO2 binary nano-composite are realized at the same time, and the activity of the product in catalytic reduction of hexavalent chromium in water under the illumination of visible light is far higher than that of a Fe3O4/SiO2/N-TiO2 ternary composite obtained by using ammonium hydroxide as the nitrogen source; besides, the product has high magnetism, magnetic separation and recovery are easy, and the prepared catalyst can be used for efficiently treating hexavalent chromium bearing wastewater.

The invention provides a quantum dot and a preparation method thereof and a photoelectric device. The preparation method of the II-III-V-VI quantum dot includes the following steps that a first nano cluster, a second nano cluster and a third nanao cluster are prepared, wherein the first nano cluster is III-V nano cluster, the second nano cluster is III-II-V nano cluster, and the third nano clusteris III-II-VI nano cluster; the first nano cluster is mixed with a non-coordination solvent to form a first quantum dot solution; the second nano cluster is mixed with the first quantum dot solution and then heated to form a second quantum dot solution; the third nano cluster is mixed with the second quantum dot solution and heated to form a third quantum dot solution, wherein the third quantum dot in the third quantum dot solution is the II-III-V-VI quantum dot. By mixing and adding the nano clusters one by one, effective doping can be achieved, the band structure is improved, and the surfacedefects and dangling bonds are reduced, so that the composition structure is adjustable and the size uniformity of the quantum dot is improved.

The invention provides a soft magnetic ferrite material with a high Bs value and low power loss and a preparation method of a magnetic core of the soft magnetic ferrite material. A main formula and effective doping are preferably selected, the soft magnetic ferrite material with the high Bs value and the low power loss is developed, the final product has a crystal grain size of 3-4 [mu]m, the initial permeability ui reaches 2200 or more, the power loss at temperature of 80-120 DEG C, 100 kHz and a Bs value of 200 mT is 380-420 kW/m<3>, and the Bs value at temperature of 100 DEG C is 450 mT ormore; a multi-stage balanced atmosphere sintering method is adopted, the density, crystal grain size, porosity and distribution in and among crystal grains of the ferrite material are controlled, so that a microstructure of soft magnetic ferrite is more effectively controlled to ensure main characteristic parameters of the material to reach harmonious unification; and the final product has high quality, and the production costs are reduced by 20% or more.

The invention discloses an integrated electric heating plate and a preparation method. The integrated electric heating plate comprises a heat preservation substrate, a heating film layer and a surfacelayer. The thickness of the heating film layer ranges from 50 nm to 10 [mu]m; and the square resistance of the heating film layer is in a range of 10 ohms/square and 1000 ohms/square. The heating film layer is made of oxide or oxysulfide, and the material of the heating film layer is one or more selected from the group consisting of ZnO<x>S<1-x>, InO<x>S<1-x>, Sn<x>In<1-x>O, Zn<x>Mg<1-x>O and Zn<x>Al<1-x>O; preferably, the heating film layer is a carbon-oxygen compound and the material of the heating film layer comprises SiO<x>C<1-x>, or the heating film layer is a carbon-nitrogen compound and the material of the heating film layer comprises SiC<x>N<1-x>. Conductive metal strips are attached to the two sides of the surface of the heating film layer and close to the edges, so a power supply circuit is formed. The integrated electric heating plate is small in heating material consumption, stable in heating material performance, high in heating efficiency and stable in heating power in the using process.

The invention belongs to the technical field of energy conversion, and discloses an efficient two-dimensional nitrogen heterocarbon material, a preparation method thereof and an application thereof inthe field of energy conversion, in particular, the application as an electric catalyst in oxygen reduction reaction and carbon dioxide electric reduction reaction. A method for prepare a high-efficient two-dimensional nitrogen heterocarbon material comprises that follow steps of: synthesizing two-dimensional silicon dioxide by adopting a double template, introducing a nitrogen-containing precursor into a silicon dioxide template, performing carbonizing at a high temperature, removing the silicon dioxide template, and obtaining the high-efficient two-dimensional nitrogen heterocarbon material.The invention also provides an efficient two-dimensional azacarbon material prepared by the method. The efficient two-dimensional nitrogen heterocarbon material has a unique two-dimensional mesoporous structure, which can not only fully expose the catalytic active sites, but also facilitate the transport of active species, showing excellent electrocatalytic performance, and can be used in electrochemical energy conversion and storage technology. In particular, the efficient two-dimensional nitrogen heterocarbon material is used as an electrocatalyst in oxygen reduction reaction in alkaline condition and carbon dioxide reduction reaction in alkaline condition.

The invention provides a preparation method of an N/S doubly doped metallic carbon compound material. The preparation method comprises the following steps: preparing an organic complex material, namely dissolving dithizone in ethanol, then adding a metal atom precursor, wherein the molar ratio of a dithizone organic ligand to the metal atom precursor is (1-4):1, stirring the mixed solution at the temperature of 30-85 DEG C, and then drying; and then preparing the N/S doubly doped metallic carbon compound material, namely putting the organic complex obtained after drying into a tubular furnace, carrying out heat preservation for 1-12 hours at the temperature of 400-900 DEG C under the nitrogen protection condition, then cooling to room temperature, then carrying out acid pickling, finally activating according to the mass ratio of the material to potassium hydroxide of 1:(2-6), and then washing to be neutral with deionized water, so that the N/S doubly doped metallic carbon compound material is obtained. The preparation method provided by the invention has the advantages that a strong oxidation bridge effect among metal, carbon and hetero atoms is combined, and electrochemical properties of the metallic carbon compound material are effectively improved.

The invention relates to a nano VO2 film with a superhydrophilic self-cleaning function and an intelligent temperature control function and a preparation method of the nano VO2 film. The preparation method of the nano VO2 film comprises the steps that firstly, a precursor solution of vanadium dioxide is prepared through a sol-gel method; then a substrate is evenly coated with the precursor solution; and finally one-step annealing is conducted, so that the nano VO2 film is obtained. A corresponding tungsten-doped VO2 film can be obtained by directly adding a tungsten source in the precursor solution, and the phase-change temperature can be adjusted to 32 DEG C; the crystal sizes of VO2 particles can be changed through tungsten ion doping, a certain micro-nano structure is formed on the surface of the substrate, and the superhydrophilic self-cleaning function at the water contact angle of 12 degrees is achieved; in addition, the difference of the light transmittance before the phase change and the light transmittance after the phase change of the film in the position with the visible light transmittance being 80% and the wavelength being 2000 nm is 26%, and an extremely good intelligent temperature control effect is achieved.

The invention relates to a fiber chelated TiO2 visible light catalyst based on an LMCT effect and N doping, and a preparation method thereof, wherein modified polyacrylonitrile fibers containing amidoxime chelated group and nano TiO2 crystal sol are combined through coordination to obtain the TiO2 catalyst containing anatase crystal form and N doping. The preparation method comprises the steps that a sol containing nano TiO2 crystals is prepared by selecting butyl titanate as a titanium source and acetic acid and absolute ethyl alcohol as hydrolysis inhibitors, and then reacts with amidoxime modified polyacrylonitrile fibers to obtain the fiber chelated TiO2 visible light catalyst based on the LMCT effect and N doping. According to the invention, the method has the advantages of being simple in equipment, simple and convenient in process, easy to operate and the like; and compared with the prior art, the catalyst disclosed by the invention can realize visible light catalysis through LMCT and N doping double ways, so that the catalyst shows higher photocatalytic activity in oxidative degradation of organic pollutants.

The invention relates to a BiAgSeS-based bulk thermoelectric material with a nano layered crystal grain structure and a preparation method, and the preparation method comprises the following specificsteps: mixing Bi powder, Ag powder, Se powder, S powder and the like as raw materials according to the mass ratio of 1:1:1:1 to obtain a reactant; carrying out thermal explosion synthesis reaction onthe reactant to obtain a BiAgSeS compound; and grinding the BiAgSeS compound into powder, and carrying out plasma activated sintering to obtain the BiAgSeS-based bulk thermoelectric material with thenano layered crystal grains. The BiAgSeS-based bulk thermoelectric material with ZT reaching 0.46 ( when at 550 DEG C) is prepared within 30 minutes by adopting a thermal explosion synthesis and plasma activated sintering process, and the preparation method has the advantages of short preparation time, low energy consumption, simple process, low equipment requirement, good repeatability, suitability for large-scale production and the like.

The invention discloses a cerium and erbium-doped silicate long-afterglow light-emitting material and a preparation method thereof. The cerium and erbium-doped silicate long-afterglow light-emitting material is mainly a composite-function inorganic fluorescent material formed by 2 alkaline earth metal ions Ba and Mg, 1 transition metal Mn and effective doping of 2 rare earth metal ions Ce and Er. The material has a stable long-afterglow light-emitting performance and relatively high thermal stability. Nominal components of the material are Ba<2+>, (2.00-2.30) Mg<2+>, (2.00-2.30) SiO3<2->, (0.150-0.170) Mn<2+>, (0.0080-0.0098) Ce<2+>, and (0. 0050-0.0080) Er<3+>. The light-emitting material provided by the invention has certain potential to be used in safe, energy-saving and environment-friendly glass products.

According to the present invention, the invention provides a fluorine-doped TiO2/SBA-15 photocatalyst and application of the fluorine-doped TiO2/SBA-15 photocatalyst in organic pollutant degradation,and the photocatalyst is prepared through adoption of the following method the steps of: carrying out a surface fluorination treatment reaction on an SBA-15 molecular sieve and fluoride to obtain a fluorine-modified SBA-15 molecular sieve; and carrying out a sol-gel reaction on a titanium source and the fluorine-modified SBA-15 molecular sieve, drying, and calcining to obtain the fluorine-doped TiO2/SBA-15 photocatalyst. The photocatalyst has a more efficient visible light utilization rate, and when the photocatalyst is used for treating organic pollutants in wastewater, the degradation rate of the photocatalyst can reach 98% or above.