38results about How to "Co-doping" patented technology

The invention discloses a method for preparing a rare earth-doped quartz glass microstructure optical fiber by adopting laser melting technology. In the method, the steps include: powder making, smelting, treatment of doped rods, preparation of optical fiber prefabricated rods, and drawing of rare earth-doped quartz glass microstructure optical fibers. Also disclosed is the application of uniformly doped quartz glass rods in all solid-state lasers and microstructured optical fibers. Also disclosed is a laser smelting system, which includes a powder feeder, a laser light source, a mother bar, a fixture, a motor, and a guide rail. The rare earth doped powder and quartz glass microstructure optical fiber prepared by the invention can realize uniform doping of various rare earth ions, and the doped microstructure optical fiber prepared by the invention has an effective doping concentration of rare earth ions exceeding 10000ppm.

The invention discloses a filter screen usable for an air purifier and a preparation method of the filter screen. The filter screen comprises a substrate layer and an activity layer, the substrate layer is provided with a modified foam nickel screen coated with a carbon micro-sphere coating, and the activity layer is provided with TiO2 co-doped Pt, Ag, N and F. The preparation method of the filterscreen includes the steps: firstly, performing reaction on the foam nickel screen in sugar solution, and performing drying and roasting to obtain the substrate layer; secondly, soaking the substratelayer into mixed solution of ammonium fluorotitanate, urea and deionized water to perform reaction, drying and roasting to obtain the filter screen with the surface with N and F co-doped TiO2 coatings; dissolving chloroplatinic acid and silver nitrate in distilled water, stirring mixture for 30 minutes at room temperature, adding sodium dodecyl benzene sulfonate to continue to stir mixture for 30minutes, and dripping sodium borohydride solution into solution to obtain impregnation liquid; soaking the filter screen with the surface with N and F co-doped TiO2 coatings into the impregnation liquid to perform reaction and drying to obtain the filter screen. The filter screen is small in air resistance and good in catalytic performance.

The invention relates to a nickel-based positive electrode material, and a preparation method thereof and a battery. The composition of the nickel-based positive electrode material is LiaNibCocMndMeM'fO2-g / 2Fg (M is at least one selected from Ti, Zr, Al, Fe, Cr, Si, and Cu; M' is at least one selected from Mg, Ca, Sr, Ba, and W; a is no smaller than 0.95 and no greater than 1.2; b is no smaller than 0.2 and no greater than 0.9; c is no smaller than 0 and no greater than 0.4; d is no smaller than 0 and no greater than 0.4; e+f is greater than 0.05and no greater than 0.2; and g is greater than 0.02 and no greater than 0. 1). Anions and cations are used in co-doping. With a synergistic effect, nickel-based positive electrode material capacity, structural stability and circulation performance are greatly improved. The preparation method at least comprises the 4 steps that: (1) corresponding raw materials are weighed according to the molar ratio consistent with LiaNibCocMndMeM'fO2-g / 2Fg; (2) the raw materials are subjected to wet grinding; (3) slurry obtained by grinding is dried; and (4) the dried material is subjected to solid-phase synthesis under a temperature of 500-1100 DEG C. With the process, the raw materials can be more uniformly dispersed, and the obtained product has the advantages of high capacity and good circulation performance. The process is simple, and has the advantages of low cost and suitability for large-scale industrialized productions. With the process, problems such as complicated process and acid and alkali pollution of a wet chemical precursor preparation method are avoided. The invention also relates to a battery with the material as an active substance.

The invention discloses a preparation method of a lithium and nitrogen co-doped diamond film. The preparation method comprises the following steps: coating a layer of suspension liquid containing a lithium source on the surface of a substrate on which a diamond film is pre-deposited; after drying, putting into a reaction chamber of a heater chemical vapor deposition system, heating in a hydrogen atmosphere to melt powder containing the lithium source and allowing lithium to be dispersed in diamond; subsequently further depositing the lithium and nitrogen co-doped diamond film in a nitrogen-containing atmosphere by adopting a heater chemical vapor deposition method. The lithium and nitrogen co-doped diamond film has low surface work function, is liable to emit electrons under the effect of heat and the effect of an electric field, and can be applied to thermo-electron energy transforming components and field emission display components.

The invention discloses a preparation process of single / multiple-element doped sodium titanate nanorod array coatings. The preparation process is characterized by adopting a hydrothermal (HT) method to prepare different sodium titanate nanorod array coatings on the surface of pure titanium, performing hydrothermal treatment on the coatings again, and achieving single / multiple-element (Mg, Ca, Sr or Zn) doping of nanorod-like sodium titanate in the coatings. The coatings are of double-layer structures and are characterized in that inner layers adjacent to a substrate are dense nanoparticle layers; surface layers are nanorods and are orientated to be nearly perpendicular to the dense nanoparticle layers; no discontinuous interfaces exist between the coatings and the substrate; and the coatings have high bonding strength being 21.0-30.2 N, can be rapidly induced to form bonelike apatite in simulated body fluid environment, and have good biological activity. According to the invention, thepure titanium substrate is subjected to bonelike surface modification from structures and components with reference to human bone; micro-nano structures and trace elements are given to the surfaces of implants; and through synergistic effects of the micro-nano structures and the trace elements, the bone integration effect is improved.

The invention belongs to the technical field of titanium-based surface treatment, and specifically relates to a titanium-based surface multi-element co-doped hydroxyapatite nanorod array configurational coating, a preparation method and the application thereof. A micro-arc oxidation-hydrothermal treatment compound method is used, an HA nanorod array configurational coating in which three elementsof strontium, zinc and magnesium are doped is prepared on the surface of pure titanium, and co-doping of five elements such as Sr, Zn, Mg, Si and C of nanorod-like HA in a coating array is realized bycarrying out second hydrothermal treatment method on the coating. The preparation method is simple in technology and low in production cost, the obtained rod-like hydrothermal treatment gets closer to the bionic component of human bone, the coating can be quickly induced in an environment similar to a body fluid to form bone apatite, and the coating has good biological activity. The coating in combination with a micro-nano structure and biological activity elements preferably stimulates a synergetically enhanced biological effect, a novel design thought is provided for the surface modification of a metal implant, and the coating is significant for efficiently promoting osseointegration.

The invention discloses a carbon material, a preparation method therefor and an application of the carbon material. The carbon material is ferrum, nitrogen and sulfur codoped multistage-pore nano-carbon, wherein a catalyst has a thin-layer flake texture. The carbon material serves as a fuel cell cathode, the catalyst is a ferrum, nitrogen and sulfur codoped multistage-pore nano-carbon redox catalyst, multistage-pore nano-carbon is doped with ferrum, nitrogen and sulfur elements, and multistage pores comprise micropores, mesopores and macropores. The carbon material has efficient redox catalysis performance and can be applied to air electrode catalysts of hydrogen-oxygen fuel cells, zinc-air fuel cells, magnesium-air fuel cells and aluminum-air fuel cells.

The invention provides a preparation method of heteroatom doped graphene-based material supported noble metal nanoparticles. The preparation method comprises steps as follows: preparation of a heteroatom doped graphene-based material: a graphene-based material is subjected to ultrasonic treatment, a heteroatom precursor is added, heteroatom doping is performed in a hydrothermal kettle at the temperature of 150-200 DEG C, and the heteroatom doped graphene-based material is obtained; preparation of the heteroatom doped graphene-based material supported noble metal nanoparticles: the heteroatom doped graphene-based material is dissolved in deionized water and subjected to ultrasonic treatment, a stabilizer and a metal precursor are added, metal in the metal precursor is platinum, palladium, gold or silver, the mixture is continuously stirred, pH is adjusted to range from 8 to 14, a reduction agent is added, the mixture is continuously stirred, and the heteroatom doped graphene-based material supported noble metal nanoparticles are obtained after vacuum drying. The synergistic effect of the heteroatom and the carrier on noble metal is used, the activity and the stability of a catalyst are effectively improved, and a preparation process is simple and suitable for industrial production and has higher economic value.

In the invention, magnetic control sputtering technology is used for growth of P-type ZnO crystal film. By the method, vacuum degree of reaction chamber is extracted to at least 4X10 to the power -3 pa, zinc-aluminium alloy that mass percent content is 0.1-0.3, NaO and O2 that purity is more than 99.99 percent are used as sputtering gas, the two gases are separately controlled by gas flomweter and mixed in buffer chamber, then are send to vacuum reaction chamber, under 3-5 Pa pressure, first step, substrate is heated to temp. 590-610 deg.C, a layer of N-Al codoped P type buffer film is deposited on the substrate, second step, the temp. of substrate is adjusted to 480-520 deg.C, then a layer of N-Al codoped P type ZnO crystal film is growth on the buffer layer. The crystal film produced by the invention has better doping uniformity, reproducibility, stability, super optical property and P type conducting characteristic.

The invention discloses a method for preparing a self-doped Fe-N-C oxygen reduction electrocatalyst by salting out thermal polymerization of animal blood. The precursor is obtained by salting out thermal polymerization of animal blood, and the moisture in the precursor is removed for crushing. The pulverized polymerized The powder of the material is placed under an inert atmosphere for high-temperature pyrolysis, and then washed and vacuum freeze-dried to obtain a self-doped Fe-N-C oxygen reduction electrocatalyst; wherein, the salting-out thermal polymerization is directed to animal blood After adding salt, the precipitate is precipitated, and then the precipitate is added to the water and boiled. The salt is sodium chloride or potassium chloride. The catalyst prepared by the invention has excellent electrocatalytic performance for oxygen reduction.

The invention provides a preparation method of a black phosphorus TiO2 heterojunction structure material loaded precious metal nanoparticle. The preparation method comprises the steps of preparing a black phosphorus TiO2 heterojunction structure material, in which a black phosphorus nanosheet layer material and a TiO2 nanosheet layer material are ball-milled under argon protection, the black phosphorus nanosheet layer material and the TiO2 nanosheet layer material are respectively washed with ethanol and water, and the black phosphorus TiO2 heterojunction structure material is obtained by suction filtration, is dried in vacuum and is collected; and dispersing the black phosphorus TiO2 heterojunction structure material in the ethanol, adding a stabilizer and a metal precursor after ultrasonic processing, continuing to perform ultrasonic stirring, adjusting pH to 9-11, adding a reducing agent, continuing to stir, and obtaining the black phosphorus TiO2 heterojunction structure material loaded precious metal nanoparticle after vacuum drying. The black phosphorus TiO2 heterojunction structure material carrier is combined with precious metal better, and the electrochemical activity and the stability of a fuel cell catalyst are effectively improved; and moreover, the preparation process is easy to operate and is suitable for production on a large scale.