43results about How to "In situ doping" patented technology

The invention relates to a method for preparing nitrogen-doped active carbon from a nitrogen-enriched biomass raw material, and belongs to the technical field of preparation of carbon materials. In the method, an active carbon material with relatively high nitrogen doping amount and a large specific surface area is prepared from the biomass raw material with rich nitrogen through carbonization and activation in an inert atmosphere. The method has the advantages as follows: the raw material is environment-friendly and renewable; the preparation process is simple; in-situ nitrogen doping can be achieved; the nitrogen doping amount and a pore structure can be controlled at the same time; a new way is provided for high-added value utilization of the nitrogen-enriched biomass raw material. The prepared nitrogen-doped active carbon can be used as an efficient electrode material, an absorbent material and a catalyst carrier and applied to the field of energy and environmental protection.

The invention provides a preparation method of biomass-based nitrogen-containing porous carbon with the advantages that simplicity is realized; the implementation is easy; the cost is low. According to the method, the in-situ doping of nitrogen atoms in the carbon material preparation process is realized by a one-step foaming method; cheap and reproducible protein-rich plants are used as carbon precursors; the in-situ doping of nitrogen atoms in the carbon material preparation process is favorably realized, so that the doping content is controllable, and the distribution is uniform. All raw materials are renewable resources; green and environment-friendly effects are achieved; simplicity is realized; the obtaining is easy; the resources are rich; the cost is low. Meanwhile, the method provided by the invention has the advantages that the nitrogen-doped porous carbon material with the large specific surface area can be obtained without complicated multistep operation; the preparation process is simple; the use of high-pollution chemical reagents such as ZnC12, strong base and strong acid is avoided; the environment-friendly effect is achieved; the operation is convenient; equipment cannot be corroded in the production and use processes; the method is suitable for large-scale production.

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 to a dual-rare earth-co-doped titanium dioxide gas sensitive sensing material preparation. The method includes the following steps of: adding urea and nitrate of rare earth elements into absolute ethyl alcohol and dissolving the urea and the nitrate of the rare earth elements to obtain solution; adding liquid phase titanium sources into the solution to form a homogeneous solution; stirring and adding deionized water into the homogeneous solution to form transparent gel; and performing hydro-thermal treatment on the transparent gel, and then performing washing, filtering and drying to obtain a dual-rare earth-co-doped titanium dioxide gas sensitive sensing nano-material. Through automatic regulation of pH to a reaction system by means of slow decomposition of the urea in a hydrothermal process, the rare earth elements can be doped into titanium dioxide; the raw materials are cheap, the dual-rare earth-co-doped titanium dioxide gas sensitive sensing nano-material with excellent crystallization can be prepared at the normal temperature, and the material is lower than 10 ppm in detection limit of ammonia gas. The dual-rare earth-co-doped titanium dioxide gas sensitive sensing material can be applied to the field of gas sensitive sensors, and also can be applied to the fields of microwave absorption materials, supercapacitors, electrochromism, and photocatalysts.

The invention relates to a semiconductor device preparing method. The method comprises the following steps: a semiconductor substrate is provided, wherein the semiconductor substrate at least includes a gate structure; and grooves are formed in two sides of the gate and a SiGeB layer is grown in the grooves through epitaxial growth. The method is characterized in that B is doped in an in-situ manner while performing the epitaxial growth of the SiGe layer, and the epitaxial growth comprises two stages: the first stage is to increase the concentration of B in the SiGe layer to make the concentration of B in the SiGe layer reaches the peak concentration; and the second stage is to reduce the concentration of B in the SiGe layer so as to eliminate the short-channel effect. Through the method of the invention, not only a more flat doping tail contour can be acquired after the B doping process is performed so as to reduce the junction leakage phenomenon, and the method can skip the separate ion implantation process so as to make the stress in the channel region maintained; and but also the method can be used to make the doping concentration of B at channels is low so as to eliminate the short-channel effect to make prepared devices have good performances.

the invention discloses a preparing method of indoor-temperature magnetic Zn1-xMnxO nanometer line in the rare-magnetic semiconductor nanometer material preparing domain, which comprises the following steps: cleaning silicate through HCl and acetone; adopting Zn powder and MnCl2 powder and evaporating source in the adjacent quartz ship; making silicate as receiving substrate at intersecting part of two evaporating source vertically; setting the vertical distance between silicate and evaporating source at 6-8 mm; placing quartz ship in the pipe-typed furnace; aerating gas in the system inlet; conducting gas in the water through rubber conduct; aerating argon gas at 300-400ml/min for 5-8 min; changing the flow of argon gas at 30-50 ml/min; heating the pipe-typed furnace at 800-830 deg.c; maintaining the system pressure at atmospheric condition; keeping temperature for 120-150 min; cooling to indoor temperature naturally to obtain the even-distributing Zn1-xMnxO nanometer line.

The invention relates to a high-elasticity anti-radiation nanofiber aerogel material and a preparation method thereof. The method comprises the steps of mixing and stirring tetraethoxysilane, phosphoric acid and water evenly for 1-24 h, then adding titanium dioxide nano powder, continuing stirring for 1-12 h, and conducting ultrasonic treatment to obtain composite hydrolysate; uniformly mixing a polyvinyl alcohol aqueous solution and the composite hydrolysate with water, conducting stirring for 1-12 hours, and then carrying out electrostatic spinning on the precursor solution to obtain a hybrid nanofiber membrane; carrying out heat treatment on the hybrid nanofiber membrane; adding the hybrid nanofiber membrane subjected to heat treatment, tetraethoxysilane, boric acid and aluminum chloride into water, adding a graphene oxide solution, and conducting stirring at a high speed to obtain a homogeneous dispersion liquid; and then sequentially subjecting the homogeneous dispersion liquid to freezing, freeze drying and post-treatment processes, so as to prepare the high-elasticity anti-radiation nanofiber aerogel material. The material prepared by the invention has high elasticity and also has excellent radiation resistance, temperature resistance and high-temperature heat insulation performance.

The invention belongs to the technical field of environmental protection materials, and provides a device and method for preparing an ordered mesoporous carbon-metal composite material and co-producing carbon from solid waste biomass. The device comprises a central control unit, a feeding unit, a double spiral mixing conveying device, a multi-functional reactor, a pH regulator, a solid-liquid separation device, a hydrothermal coupling carbonization device and a pyrolysis gas circulation device. In view of toxic and harmful carbon precursors such as phenol and formaldehyde in the ordered mesoporous carbon field, a dilute acid-coupled metal salt is researched and developed to catalyze hydrothermal acid-decomposition of solid waste biomass instead of toxic reagents, and high-value utilizationof the solid waste biomass is realized. In-situ doping of a metal salt can achieve preparation of the ordered mesoporous carbon-metal salt composite, and the product has both an electric double layerand pseudocapacitance energy storage characteristic, and excellent electrical reserves. In-situ catalysis of the metal salt results in preparation of a high-porosity biological carbon material. The design of integrated equipment realizes continuous operation of acid hydrolysis, solidification and carbonization, and is conducive to industrialization and application.

The invention discloses an N, S co-doped metal-free CNS oxygen reduction catalyst and a preparation method thereof, and belongs to the technical field of energy materials and electrochemistry. Glucoseis used as a carbon source, g-C3N4 is used as a nitrogen source and a soft template agent, polysulfide is used as a sulfur source, and the three-dimensional porous carbon material catalyst is synthesized through a hydrothermal-calcination two-step method. The obtained CNS catalyst is of a three-dimensional porous graphene-like structure, the surface of the catalyst contains a large number of porestructures, and the ORR of the catalyst has the initial potential of 1.01 V and the half-wave potential of 0.88 V in an alkaline electrolyte and has better catalytic performance than a commercial Pt/C catalyst. The catalyst has a large number of pores, can expose more active sites, is beneficial to transmission of ORR reaction substances, and is beneficial to improvement of ORR catalytic activityof the material. The selected reagents are low in toxicity, wide in raw material source, low in cost, simple in preparation process, green, pollution-free, easy for large-scale production and beneficial to large-scale application. The catalyst can be used in fuel cells, metal-air cells and other acidic and alkaline primary and secondary cells involving ORR.

The invention discloses an N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and a preparation method thereof, and belongs to the technical field of energy materials and electrochemistry. The preparation method comprises the following steps of: dispersing a polysulfide precursor into a solvent, transferring an obtained mixture into a reaction container, andreacting at 50-300 DEG C to obtain a polysulfide precursor material; preparing a precursor of the N, S co-doped porous carbon coated CNT catalyst; and finally, putting the obtained NSC-CNT-Px materialinto a reaction furnace, heating to 600-1200 DEG C, and carrying out heat treatment to obtain the N, S co-doped porous carbon coated CNT catalyst. The catalyst prepared by the invention has a large number of pores and a high specific surface area, is beneficial to improving the ORR/OER catalytic activity of a material, is simple in preparation process, is green and pollution-free, is easy for large-scale production, and is beneficial to large-scale application.

The invention belongs to the field of battery materials, and particularly relates to a preparation method of a metal-carbon composite negative electrode material; the preparation method comprises thesteps of mixing bituminous coal with a metal source to obtain a mixture; and sequentially performing first-stage sintering, second-stage sintering and third-stage sintering on the mixture to obtain the composite negative electrodes material, wherein the sintering temperature is 300 DEG C or below in the first-stage sintering; the sintering temperature is 400-600 DEG C in the second-stage sintering; and the sintering temperature is 700-1,200 DEG C in the third-stage sintering. The invention also discloses the negative electrode material prepared by adopting the preparation method and an application of the negative electrode material in preparation of a negative electrode of a lithium ion battery. According to the method, bituminous coal is creatively adopted as a raw material; and the raw material is matched with the metal source, and the battery negative electrode material with excellent electrical property can be prepared under the special three-stage sintering mechanism.

The invention relates to the technical field of a battery negative electrode material, and particularly discloses a preparation method of a coal-based battery negative electrode material. The preparation method comprises the steps of mixing soft coal and graphene to obtain a mixed material; performing one-segment sintering on the mixed material under 400-500 DEG C, and then performing two-segmentsintering on the mixed material under 700-1,000 DEG C; and obtaining the coal-based battery negative electrode material. The invention also discloses the negative electrode material prepared by the method and application of the negative electrode material used as a negative electrode of a lithium ion battery or a sodium ion battery. The soft coal is creatively used as a raw material, the raw material is matched with the graphene, and the battery negative electrode with excellent electrical performance can be prepared under a special two-segment sintering mechanism.

An MPCVD device capable of achieving effective doping comprises a reaction chamber and a gas input structure, the gas input structure comprises two reaction gas pipelines, a distributor connected with the first pipeline evenly conveys gas into the reaction chamber, a gas outlet is located near the top of the reaction chamber, reaction gas is evenly conveyed into the reaction chamber, and the reaction gas is evenly conveyed into the reaction chamber. The gas distributor is located in the top area of the chamber; the first pipeline is used for transmitting a first reactant, the second pipeline is used for uniformly inputting doped reaction gas to the surface of a substrate through a circular ring gas distributor, the horizontal height of a gas transmission ring of the second pipeline is consistent with that of a substrate support, and the gas transmission ring can be placed at the central position and is of an inner concentric structure with the support; the gas transmission ring can also be placed on the periphery of the support, and the gas transmission ring and the support are of an outer concentric structure. According to the invention, the two pipelines are adopted to transmit the reaction gas respectively, so that the doping effect of MPCVD can be effectively realized.