1592 results about "Co doped" patented technology

Multimode optical fiber is disclosed herein comprising germania and fluorine co-doped in the core of the fiber. The dopant concentration profiles are defined by a pair of alpha parameters. The operating window, or bandwidth window, is enlarged and attenuation, or loss, is low. In some embodiments, two operating windows are available for transmission.

The invention discloses a process for preparing a high efficiency nanometer Tio2 visible light catalyst codoped with metal and non metallic ion, belonging to the photocatalysis technology field. The invention adopts titanic acid ester as precursor, uses metal salt and non-metallic compound as dopant, in accordance with sol-gel method, prepares the nanometer TiO2-based photocatalyst with codoping, high efficiency and visible light catalytic activity, wherein the catalytic activity is greatly higher than that of single-doped TiO2-based catalyst. The invention is characterized by the following: 1. due to codoping of the metal and non metallic ion, discrete localized doping level is formed respectively on the lower part of the conduction band energy level and the upper part of the valence band energy level of the TiO2-based catalyst, thus increasing the absorption of visible light and greatly improving the catalytic activity; 2. the doping level can inhibit the recombination of photogenerated carrier, promote the probability of the photogenerated carrier entering into the photocatalytic reaction and efficiently degrade pollutant molecules.

Nitrogen-doped titania nanotubes exhibiting catalytic activity on exposure to any one or more of ultraviolet, visible, and/or infrared radiation, or combinations thereof are disclosed. The nanotube arrays may be co-doped with one or more nonmetals and may further include co-catalyst nanoparticles. Also, methods are disclosed for use of nitrogen-doped titania nanotubes in catalytic conversion of carbon dioxide alone or in admixture with hydrogen-containing gases such as water vapor and/or other reactants as may be present or desirable into products such as hydrocarbons and hydrocarbon-containing products, hydrogen and hydrogen-containing products, carbon monoxide and other carbon-containing products, or combinations thereof.

The present invention provides co-doped zinc oxide to flat panel, light emissive display devices and vacuum microelectronic devices to improve their efficiency and lifetime. This material has a low growth temperature and is compatible with metal oxide semiconductor (MOS) processing technology. It is tranparent, chemically stable and has a low work function, which result in many advantages when being used as the cathode for the aforementioned devices. In one embodiment of the emissive display device, an organic light diode (OLED) display has a high work function metal anode, such as platinum (Pt), gold (Au) or nickel (Ni) and a low work function co-doped zinc oxide cathode. Because of the energy level alignment provided by these two materials, the potential energy barriers to injection of electrons from the cathode and holes from the anode into the organic emissive medium are minimized so the display device operates more efficiently.

The invention discloses a nitrogen and sulfur co-doped graphene. The method comprises the following steps: grinding and uniformly mixing graphene or a graphene derivative, a nitrogen-containing compound and a sulfur-containing compound, carrying out thermal annealing under the protection of an inert gas at a temperature of 500-1000DEG C, maintaining the temperature for 1-5h, and cooling to room temperature to obtain the nitrogen and sulfur co-doped graphene, wherein content of the nitrogen element in the nitrogen and sulfur co-doped graphene is 1-10at.%, and the content of the sulfur element in the nitrogen and sulfur co-doped graphene is 0.5-2at.%. The method has the advantages of simple technology, low cost, easy control of the reaction process and the like, is suitable for the industrial large-scale production, and can be used in the super capacitor field, the sensor field, the catalytic field, the fuel battery field, the lithium air battery field and the like.

In order to degrade the pollutants in water and atmosphere by the photocatalysis technology, the invention discloses a method for preparing a high activity non-metallic ion co-doped titanium dioxide photochemical catalyst. In the photochemical catalyst, titanium ester or titanate is used as a precursor, non-metallic compound comprising boron, carbon, nitrogen, fluorin, silicon, phosphor, sulfur, chlorine, bromine, iodine, and the like, are used as doping agents, the high activity non-metallic ion co-doped titanium dioxide photochemical catalyst is prepared by adopting the sol gel method. Compared with a titanium dioxide photochemical catalyst single-doped with pure titanium dioxide and the non-metallic irons, the visible light catalytic activity of the titanium dioxide photochemical catalyst on the degradation of parachlorophenol is greatly improved, and the ultraviolet light catalytic activity can also exceed the catalytic activity of the pure titanium dioxide catalyst. The method also has the advantages that the preparation technique is simple, the equipment requirement is low; the particle diameter of the product is small, the specific surface is relatively high, the dispersivity is good, thus having a wide application prospect in the environmental cleaning scientific field.

The invention provides a preparation method and an application of a nitrogen and phosphorus co-doped porous carbon catalyst and belongs to the field of oxygen reduction catalysts for a fuel cell cathode. Nitrogen and phosphorus are introduced with an in-situ doping method, and the nitrogen and phosphorus doping amount is changed by adjusting the content of a nitrogen and phosphorus precursor. Besides, nitrogen and phosphorus co-doped porous carbon is prepared with a hard template method, and controllability of pore diameters of the porous carbon is realized by adjusting a hard template. The method comprises steps as follows: an earlier polymer of aniline monomers, a phosphorus precursor, a silica-based hard template and non-precious metal salt is prepared; the earlier polymer is calcined, and solids are obtained; the solids are etched, cleaned and dried, and the carbon material is obtained. More importantly, the prepared nitrogen and phosphorus co-doped porous carbon material has an excellent oxygen reduction electro-catalytic property under the acid condition and has huge application potential.

Scintillation materials of this invention have an alkali halide host material, a (first) scintillation dopant of various types, and a variety of second dopants (co-dopants). In another embodiment, the scintillation materials of this invention have an alkali halide host material, a (first) scintillation dopant of various types, a variety of second dopants (co-dopants), and a variety of third dopants (co-dopants). Co-dopants of this invention are capable of providing a second auxiliary luminescent cation dopant, capable of introducing an anion size and electronegativity mismatch, capable of introducing a mismatch of anion charge, or introducing a mismatch of cation charge in the host material.

The invention relates to a nanometer titanium dioxide photocatalyst co-doped with boron and other elements and a preparation method thereof. The method uses titanate and boric acid as a titanium source and a boron source; the other doped elements comprise one or more of transition metal, rare-earth metal or nonmetal; and the method adopts acetic acid, nitric acid or citric acid as a hydrolysis catalyst and a mixture of alcohol and water as a reaction system and prepares the nanometer titanium dioxide photocatalyst co-doped with the boron and the other elements by a sol-gel reaction and calcinations. The nanometer titanium dioxide co-doped with the boron and other elements prepared by the method can absorb visible light and has catalytic activity of the visible light.

The present invention relates to a nanophosphor and method for synthesizing the same, and provides a nanophosphor containing fluoride-based nanoparticles co-doped with Yb³⁺ and Er³⁺ expressed by the following Chemical Formula 1,

NaY_{1−w−z−x−y}Gd_wL_zF₄:Yb³⁺_x,Er³⁺_y  (1)

wherein, the description of the values x, y, w, z, and L is the same as defined above.

The nanophosphor may exhibit an excellent luminous intensity despite having a small particle size, and be excited by infrared rays to emit visible light, and have magnetic properties and thus can be used as a contrast agent, a counterfeit prevention code, and the like.

The invention discloses a rare earth/alkaline earth metal and transition metal doped bismuth ferrite nano multiferroic material, and the chemical formula is Bi1-xRxFe1-yMyO3, wherein R is rare earth metal or alkaline earth metal, M is transition metal, x is not less than 0 and not more than 0.30, and y is not less than 0 and not more than 0.02. The preparation method has the steps of taking ferric nitrate, bismuth nitrate, rare earth/alkaline earth metal oxide or nitrate and transition metal nitrate as raw materials, taking ethylene glycol as a solvent, or using a specific additive for matching, mechanically stirring, forming even ethylene glycol solution, then aging at room temperature, evaporating and drying the obtained solution at the temperature of 160-250 DEG C, and carrying out thermal treatment at lower temperature for obtaining rare earth/alkaline earth metal A-site doped, transition metal B-site doped and rare earth/alkaline earth metal A-site and transition metal B-site co-doped bismuth ferrite nanoparticles of 20-100nm. The prepared nano multiferroic material has stable crystal quality, thereby having extensive application prospects in the fields of information storage, magnetic sensors of spin electronic devices, capacitor-inductor integrated devices and the like.

Semi-insulating Group III nitride layers and methods of fabricating semi-insulating Group III nitride layers include doping a Group III nitride layer with a shallow level p-type dopant and doping the Group III nitride layer with a deep level dopant, such as a deep level transition metal dopant. Such layers and/or method may also include doping a Group III nitride layer with a shallow level dopant having a concentration of less than about 1×10¹⁷ cm⁻³ and doping the Group III nitride layer with a deep level transition metal dopant. The concentration of the deep level transition metal dopant is greater than a concentration of the shallow level p-type dopant.

The invention provides a nitrogen-sulfur co-doped carbon material with an electro-catalytic oxygen reduction activity and a preparation method of the carbon material, and belongs to the technical field of new material application. The technologic process comprises the following steps: performing ultrasonic cleaning on hairs with acetone, then shearing and crushing the hairs, pouring the hairs into a liner of a reaction kettle, adding analytically pure ammonia water, carrying out a hydrothermal degradation reaction, drying the solution obtained from hydrothermal degradation to obtain solid amino acid, mixing the solid amino acid with a template agent uniformly, thermally decomposing the mixture under an inert atmosphere, removing the template agent with diluted hydrochloric acid from the obtained sample, washing and drying, so as to prepare the nitrogen-sulfur co-doped carbon material. As the carbon material is prepared by taking hairs as the raw materials, the raw materials are simple and accessible, and low in cost; the selected template agent is low in cost and easy to remove; the preparation method is simple in technology; the prepared material is high in nitrogen and sulfur content, and has larger specific surface area, and is rich in pore structures; the nitrogen-sulfur co-doped carbon material prepared by the method shows up excellent properties in fuel cell cathode oxygen reduction and catalysis.

A method for fabricating a p-n heterojunction device is provided, the device being preferably comprised of an n-type GaN layer co-doped with silicon and zinc and a p-type AlGaN layer. The device may also include a p-type GaN capping layer. The device can be grown on any of a variety of different base substrates, the base substrate comprised of either a single substrate or a single substrate and an intermediary layer. The device can be grown directly onto the surface of the substrate without the inclusion of a low temperature buffer layer.

The invention provides a method for preparing sulfur and nitrogen co-doped titanium dioxide with visible light catalytic activity, which adopts a sol-gel method and comprises the following steps: hydrolyzing titanium ester and introducing sulfur and nitrogen sources to obtain a titanium dioxide sol, wherein the sulfur and nitrogen sources are from thiourea solution; in a sol system, dropwise adding 1 to 5 percent saturated aqueous solution of thiourea to perform the hydrolysis reaction to obtain the sol; then performing aging and volatilizing a diluent to obtain a titanium dioxide gel; drying the titanium dioxide gel and grinding into powders; performing heat treatment on the solid powder; and calcinating to obtain sulfur and nitrogen co-doped titanium dioxide nano powder. In the method, the thiourea is used as the raw materials of the nitrogen and sulfur sources, the sulfur and the nitrogen are simultaneously introduced in the process of the hydrolysis reaction of the sol to achieve synergistic effect and improve the reaction efficiency, raw material consumption is less, the process is simplified, the absorption range of visible light is effectively improved, the wavelength of the visible light is expanded to about 650nm, and the sulfur and nitrogen co-doped titanium dioxide has obvious visible light activity in the photocatalytic degradation reaction of organic pollutant molecules.

The invention discloses a preparation method and products of a non-noble metal catalyst. The preparation method of the non-noble metal catalyst comprises the steps of dissolving two metal salts and an organic ligand proportionally in an organic solvent respectively, mixing well, standing a solution at room temperature, and centrifuging or filtering and fully drying to obtain a precursor; subjecting the precursor to high-temperature pyrolysis in an inert atmosphere to obtain the non-noble metal catalyst; the prepared non-noble metal catalyst is a nano-structure carbon material with cobalt and another metal element co-doped, with MOF structure as a core and with carbon nanotubes grown on the surface; the non-noble metal catalyst prepared herein has high redox catalytic activity and stability and excellent CH3OH/CO tolerance in acidic electrolyte, the cost for the materials used herein is low, the preparation method is simple and convenient and is easy to perform.

The invention discloses a method for directly preparing a co-doping three-dimensional graphene electrode material through biomass carbon sources. The method mainly includes the steps that biomass such as eggshells of artemia cysts, bean pulp and shrimp shells are used as the carbon sources, red phosphorus or boric acid is added to serve as a stripping agent, metal nickel salt is added to serve as a catalyst, and oxygen-nitrogen-phosphor multi-atom co-doping three-dimensional porous graphene is synthesized in a roasted mode at the temperature of 700 DEG C to 900 DEG C under argon atmosphere; the obtained graphene is ground into powder, the graphene, acetylene black and PTFE are ultrasonically dispersed into absolute ethyl alcohol in the mass ratio of 85:10:5, the mixture is dried at the temperature of 80 DEG C to be pasty, 0.5 mg to 5 mg of the mixture is taken and evenly smeared on 1*1-cm foam nickel, vacuum drying is carried out at the temperature of 120 DEG C for 12 h, plate pressing is carried out at the pressure of 12 MPa, and an electrode plate is obtained. According to the method, the source of the required raw materials is wide, the price is low, devices are simple, repeatability is good, and low-cost large-scale industrial production can be achieved easily; the prepared graphene electrode material has the advantages of being good in electrochemical activity, large in specific area, not prone to repeated accumulation and the like; the broad application prospects are achieved in the aspects such as electrode materials and catalyst carriers of supercapacitors and lithium ion batteries.

The invention relates to an iron and nitrogen co-doped carbon-oxygen reduction catalyst, and a preparation method and application thereof. Fe/Zn bimetallic ZIF with elemental gradient distribution isprepared to prepare an iron and nitrogen co-doped carbon-oxygen reduction catalyst by pyrolysis and carbonization as a precursor, in order to improve the utilization rate of active sites, optimize thepore structure and further enhance the catalytic activity. The iron and nitrogen co-doped carbon-oxygen reduction catalyst prepared by the invention can efficiently catalyze the oxygen reduction reaction and exhibits better oxygen reduction catalytic activity and electrochemical stability than the commercial Pt/C catalyst. The preparation method is simple and controllable, has short cycle, abundant raw material reserves and low cost, and can realize large-scale production.

The invention discloses a single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power. Polarization maintaining optical fiber is rare-earth-doped phosphate single-mode glass optical fiber, the component of a fiber core is phosphate glass which consists of 70P2O5-8Al2O3-15BaO-4La2O3-3Nd2O3, the fiber core of the polarization maintaining optical fiber is doped with high-concentration luminous ions, the luminous ions are one or combination of more than one of lanthanide ions and transition metal ions, the doping density of the luminous ions is greater than 1*10<19>ions/cm<3> and the luminous ions are evenly doped in the fiber core. A polarization maintaining fiber Bragg grating with the narrow linewidth and a dichroscope form a front cavity mirror and a rear cavity mirror of the optical fiber laser, a centimeter-sized erbium-ytterbium co-doped phosphate glass polarization maintaining optical fiber is taken as a laser working substance, and polarization maintaining output laser generated by a single-mode semiconductor laser is taken as a pumping source, thus achieving the single longitudinal-mode laser output by designing and manufacturing the reflection spectrum width of the polarization maintaining fiber Bragg grating and controlling the cavity length of the whole laser cavity.

The invention discloses a multi-element in-situ co-doped ternary material precursor as well as a preparation method and an application thereof. The chemical formula of the precursor is (NixCoyMnz)(1-a-c)MaNc(OH)(2+k), wherein x is larger than or equal to 1/3 and smaller than or equal to 0.9, y is larger than 0 and smaller than or equal to1/3, z is larger than 0 and smaller than or equal to 0.4, the sum of x, y and z is 1, a is larger than or equal to 0.0001 and smaller than or equal to 0.01, and c is larger than or equal to 0.0001 and smaller than or equal to 0.01; radius of a doped ion M is close to that of the lithium ion, and M is selected from one or more of Mg<2+>, Zn<2+>, Zr<4+>, Nb<5+>, Ta<4+>, In<3+>, Sc<3+>, Y<3+>, Ce<4+> and Gd<3+>; radius of a doped ion N is close to that of metal ions Mn and Co in the ternary material, and N is selected from one or more of Al<3+>, Ti<4+>, Ge<4+>, W<6+> and V<5+>. In the preparation process of the ternary material precursor, two kinds metalions with different radii are introduced in situ, so that the doped metal ions are uniformly distributed in a precursor phase, and uniform mixing on the atomic grade is realized. The two kinds of metal ions with different radii are doped in different positions, cell parameters have coordinated variation, so that not only can a lithium ion transmission channel be expanded, but also good lattice structure of the ternary material can be kept, and the ternary material with excellent electrochemical performance is obtained.

The invention relates to a preparation method for a rare earth element-doped titanium dioxide nano material. The method comprises the steps of dissolving urea and rare earth element nitrate in absolute ethyl alcohol; adding liquid titanium source into the above solution to form a homogeneous solution; adding deionized water with stirring to form a transparent gel; performing hydro-thermal treatment on the above gel; washing, filtering and drying to obtain the rare earth element-doped titanium dioxide nano material. An object of doping titanium dioxide by using the rare earth element is realized through automatic regulation and control of pH value of a reaction system by slow decomposition of urea in the hydrothermal process. The preparation method is simple in process and flow, has wide parameter adjustable range, strong repeatability and low cost, and can be used for preparing different rare earth element-doped titanium dioxide nano materials or a plurality of the rare earth elements co-doped titanium dioxide nano material.

The invention relates t a phosphate base optical glass mixed with ytterbium and bismuth and a manufacturing method of the phosphate base optical glass. The compositions and mol percentage of the glass is that: P2O5(50-80), Al2O3(5-30), Ta2O3(0-5), Ga2O3(0-5), Y2O3(0-5) , Li2O(0-30), Na2O(0-15), K2O(0-5), ZnO(0-15), MgO(0-40), CaO(0-30), SrO(0-15), BaO(0-15), TiO2(0-5), ZrO2(0-5), SiO2(0-20), Bi2O3(0.01-5), Yb2O3(0.01-15); wherein the figures in the bracket refer to the selection range of mol percentage of the corresponding oxide of the compositions. Under the pump of 405nm, 532nm, 808nm and 980nm, higher near infrared ultra wideband fluorescence can be obtained; and under the pump of 980nm, the glass fluorescence emission has a remarkable reinforced effect and is hopeful to be applied in fields such as optical amplifier, superpower laser and tunable laser.