146 results about "Tin dioxide" patented technology

The invention discloses a preparation method of a three-dimensional split-phase fancy glaze for coal gangue ceramic body decoration, the three-dimensional split-phase fancy glaze comprises a ground glaze and a cover glaze, the cover glaze comprises the following raw materials by weight: 15-20% of quartz, 10-15% of calcite, 5-10% of kaolin, 5-10% of zinc oxide, 10-15% of calcium phosphate, 25-30% of potassium feldspar, 2-5% of calcium borate, 5-10% of tin dioxide, 3-5% of spodumene, and 2-5% of a coloring oxide; the ground glaze is prepared from the following raw materials in percentage by weight: 15-20% of quartz, 10-15% of wollastonite, 5-10% of kaolin, 10-15% of zinc oxide, 15-20% of calcium phosphate, 15-20% of spodumene, 5-10% of titanium dioxide, 5-10% of calcium borate, 2-5% of coal gangue and 2-5% of coloring oxide, and the product is obtained through raw material preparation, glazing and sintering. The prepared three-dimensional split-phase fancy glaze is simple in process, high in adaptability, unique in effect and wide in market prospect.

The invention discloses a nitric acid type system tin stripping liquid centralized recovery treatment process which comprises the following steps: firstly, adding a cationic coagulant into a nitric acid type tin stripping waste liquid, filtering through a 5-micron filter membrane, discharging into a reaction kettle, and adding a H2O2 solution with the concentration of 5-10%; the pH is adjusted to 2.0-2.5, and copper is removed under the condition of 40-50 DEG C; when the pH value is increased from 2.5 to 3.0-3.5, iron is removed; adjusting the pH value to 13.0-13.5, heating to remove aluminum, and separating to obtain a filtrate containing Na2SnO3; adjusting the pH value of the filtrate to 6.0-6.5, heating to 70-75 DEG C for reaction, and then carrying out gradient cooling to room temperature to generate Sn (OH) 4 precipitate; and centrifugally separating the mixed solution to obtain a tin-containing solid and a tin stripping regenerated solution, and firing the tin-containing solid to obtain a tin dioxide solid. Compared with a traditional process, copper is removed firstly, then iron is removed, aluminum is finally removed, and directional removal is achieved through the difference of precipitation conditions.

The invention belongs to the technical field of metal resource recovery and reutilization, and particularly relates to a selective recovery method for valuable metal in a retired crystalline silicon cell photovoltaic welding strip. The method comprises the following steps: disassembling a photovoltaic solder strip from a retired crystalline silicon cell, and removing impurities from the photovoltaic solder strip to obtain a clean solder strip; adding the clean welding strip into an acetic acid solution, heating and stirring to fully react, and filtering to respectively obtain filter residues, copper strips and lead-containing filtrate; adding a precipitant into the lead-containing filtrate to carry out precipitation reaction, and after the reaction is finished, carrying out solid-liquid separation, washing and drying to obtain a lead sulfate product; washing and drying filter residues to obtain a tin dioxide crude product; and washing the copper bar with absolute ethyl alcohol, and drying to obtain the metal copper bar with the purity not lower than 99.0%. The method has the advantages of high metal separation efficiency, high recovery rate, low energy consumption, low acid and alkali consumption, difficulty in causing secondary environmental pollution and the like, and provides a feasible solution for selective separation and recovery of valuable metals of retired photovoltaic modules.

The invention discloses a preparation method of a high-efficiency gas sensor for confinement isolated platinum atoms based on porous SnO2 nanorods, isolated Pt atoms are precisely deposited in SnO2 pore channels through an ALD technology, and the working temperature (190 DEG C) of the sensor is remarkably reduced by utilizing a confinement effect and a monatomic catalysis synergistic effect, so that the gas sensor has high sensitivity and high sensitivity. The sensitivity (Ra / Rg = 6.33 at5ppm) to acetone, the response speed (9 seconds) and the stability (the attenuation rate is 2.8% in 28 days) are improved. The sensor has wide application prospects in the fields of medical diagnosis, environmental monitoring and the like.

The invention relates to the technical field of an electrode composed of an active material or comprising the active material, in particular to a preparation method and application of an MXene / Sn composite material. The invention provides a preparation method of an MXene / Sn composite material, which comprises the following steps of: S101, preparing porous tin: in an inert gas or vacuum environment, atomizing molten tin alloy gas to obtain solid powder particles, and etching by using acid or alkali to obtain the porous tin; s102, porous tin surface treatment: carrying out surface oxidation treatment on the porous tin obtained in the step S101 to form tin dioxide sites or thin layers on the surface of the porous tin; s201, MXene is prepared and obtained; s202, surface modification of MXene: MXene obtained in S201 is treated with hydrogen peroxide, and then carboxyl or amino is introduced; and S3, porous tin and MXene are compounded, the dispersion liquid of the porous tin obtained through treatment in the step 102 is mixed with the dispersion liquid of the MXene subjected to surface modification in the step 202, and compounding is completed through electrostatic attraction. The self-agglomeration phenomenon in the charging and discharging process can be inhibited, and the high energy density is achieved.

The invention relates to the technical field of lithium ion battery electrode materials, and discloses a carbon-coated tin dioxide / MBene nano composite negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: preparing MBene through a hydrothermal etching method; the preparation method comprises the following steps: performing in-situ growth of SnO nanoparticles on MBene through a hydrothermal method to obtain a tin dioxide / MBene composite material; and adding a carbon source and carrying out carbonization treatment to form a carbon coating layer on the surface of the tin dioxide / MBene composite material. The prepared composite material effectively solves the problems of volume expansion, poor conductivity and unstable interface of SnO. The composite material disclosed by the invention is used as a lithium ion battery negative electrode active material, has high specific capacity, ultra-long cycle life and excellent rate capability, is simple and controllable in preparation process, and has the feasibility of large-scale production.

The invention relates to the technical field of electrochemical water treatment, in particular to a preparation method of a self-supporting antimony-doped tin dioxide nanoflower electrode, which comprises the following steps: dissolving trisodium citrate dehydrate and antimony trichloride in absolute ethyl alcohol; then adding water and stannous chloride dehydrate to form a precursor solution; heating the precursor solution, and naturally cooling; after cooling, carrying out solid-liquid separation on the bottom mud, and then cleaning and drying to obtain antimony-doped tin dioxide powder; taking antimony-doped tin dioxide powder, a pore-forming agent and a binder, grinding the materials until the materials are uniformly mixed, and transferring the materials into a tabletting mold for pressure casting to obtain a blank; and calcining the green body to obtain the product. Nano-flower-shaped antimony-doped tin dioxide powder is prepared, in the die casting and sintering process, due to the fact that nano-flower petals of the nano-flower-shaped antimony-doped tin dioxide powder are mutually staggered, a connection mode similar to a mortise and tenon joint mode is formed, and compared with nanospheres, the binding force between the powder is enhanced; and the mechanical strength, the electrochemical active area and the catalytic activity of the electrode are improved.

The application relates to a preparation method of a tin dioxide negative material, and belongs to the technical field of lithium battery negative material synthesis. The application aims at solving the problems of the existing SnO2 negative material, such as large volume effect in the charging and discharging process, easy falling off on the current collector, complex preparation process of the SnO2 negative material and high cost. The preparation method comprises the following steps: S1, preparing a micro-arc oxidation electrolyte; S2, placing a titanium foil and the micro-arc oxidation electrolyte in a micro-arc oxidation electrolytic tank, taking the titanium foil as a positive electrode and a stainless steel plate as a negative electrode; and S3, micro-arc oxidation. The application is used for the preparation of the tin dioxide negative material.

This invention discloses a method for preparing tin dioxide powder by freeze-drying to inhibit tin hydroxide agglomeration. The method involves adding a tin source solution (36-54 g / L) and a precipitant solution (5-30 g / L) at a mass ratio of 1:0.1-0.25 under constant temperature and magnetic stirring. The precipitant solution is then added dropwise to the tin source solution, reacting to form tin hydroxide colloid. After static aging, the colloid undergoes rapid cryogenic freezing to instantly freeze it into an ice state. The ice-state colloid is then subjected to low-temperature vacuum sublimation drying to obtain loose tin hydroxide dry powder. The dry powder is then calcined to obtain tin dioxide powder. This invention fundamentally eliminates the agglomeration of tin dioxide powder, resulting in tin hydroxide dry powder with an agglomeration rate of less than 10% and a purity of over 99.9%, providing a high-quality precursor for high-performance electronic-grade tin dioxide.

The present invention discloses a H2 sensor material based on SnO2-doped graphene aerogel and a preparation method. The material comprises mixing graphene oxide with N,N-dimethylformamide and water to form a mixed solution, adding the mixed solution to a tin salt solution, performing a solvothermal heat treatment, and then calcining the solution in a muffle furnace. The present invention dopes the graphene aerogel with SnO2 nanoparticles. The graphene aerogel structure modifies the operating characteristics of the tin dioxide material, resulting in a sensor material with high gas sensitivity, good selectivity, and stability. This reduces the sensor's operating temperature and device power consumption, resulting in ultrahigh sensitivity, anti-interference performance, and good resistance to electrolyte corrosion. The material has broad application prospects in the future field of thermal runaway early warning technology for lithium-ion batteries.

To provide a gas sensor with good response characteristics to gas (low-concentration gas in particular).SOLUTION: A gas sensor is provided, comprising a base material, first and second electrodes provided on a surface of the base material, and a gas sensing layer connected to the first and second electrodes and provided with a Ni-containing SnO2 nanosheet comprising an SnO2 nanosheet and Ni contained in the SnO2 nanosheet.SELECTED DRAWING: Figure 7

This disclosure provides techniques for detecting / inhibiting corrosion of in distribution / recirculation service lines and for using tin dioxide as a surfactant to coat at-risk piping surfaces. For example, disclosed techniques can be used to correlate corrosive conditions with fluid type, source and other environmental parameters, and to treat piping so as to insulate corroding areas. A stannous dosing system, and optionally, associated downstream filtration, can be used to efficiently deliver tin throughout piping surfaces at interest, and thereby facility local tin dioxide surfactant buildup to target thicknesses, at difficult to reach locations. In one embodiment, disclosed systems can be used to build a correlation database that can be used in the automated control of systems taught herein.

A kind of anti-spark ceramic and its body glaze, preparation method, use and ceramic tile, the body glaze is characterized in that, by mass fraction, its raw materials include: 3-12 parts of light calcium powder, 1-10 parts of magnesium oxide, 8-17 parts of dolomite powder, 6-12 parts of sodium sand, 6-12 parts of potassium sand, 0.5-6 parts of alumina and 10-25 parts of pottery clay, can also add tin dioxide, diantimony trioxide and zinc oxide as slurry conductive nanomaterial, can adjust both anti-spark property and anti-static property of ceramic to the best interval simultaneously.Anti-spark ceramic is provided with a body glaze layer prepared from the above-mentioned body glaze of anti-spark ceramic.The preparation method is used to prepare the above-mentioned anti-spark ceramic.The present application can solve the problem of friction impact sparking of other floor materials in the prior art, and also solve the problem that the anti-spark performance and anti-static performance of ceramic cannot be simultaneously achieved.

This invention discloses a high-temperature conductive graphene solution and its preparation method, comprising the following components by weight: 1800-2000 parts of a dispersion containing 3-5 nm graphene quantum dots, wherein the quantum dot content is 5-10 wt%; 450-510 parts of tin dioxide with a particle size ≤0.2 μm; 15-20 parts of ammonium tungstate and 15-20 parts of lanthanum oxide; 30-40 parts of manganese chloride tetrahydrate, 20-30 parts of nickel chloride, and 20-30 parts of copper chloride; 8000-10000 parts of a solvent system, wherein deionized water ≤4000 parts, anhydrous ethanol ≤5000 parts, isopropanol ≤100 parts, and n-butanol ≤50 parts; 800-1000 parts of tri-n-butyltin hydride and 100-300 parts of citric acid. Due to the adoption of the above technical solutions, this application has achieved breakthroughs in the stability of conductive networks through quantum dot bridging mechanisms; the standard deviation of electron migration path length has been reduced from 1.2 μm to 0.08 μm; the heterojunction interface has been optimized and a Type-II band structure has been formed, resulting in an 82% reduction in contact resistance.

The invention discloses a tin-based alloy catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst comprises a carrier and an active component, the carrier comprises tin dioxide or metallic tin, and the active component is selected from at least one of transition metal and main group metal with catalytic action; the mass percent of the active component in the catalyst is 0.01%-30%, preferably 0.01%-10%. The active component is selected from metal with a catalytic action and an eutectic point of 500 DEG C or below. According to the tin-based alloy catalyst, high conductivity and an adjustable electronic structure promote efficient electron transmission, reaction kinetics is remarkably improved, and meanwhile the tin-based alloy catalyst shows excellent chemical stability in the catalysis process. The tin-based alloy catalyst provided by the invention is simple to prepare, low in cost, environment-friendly, high in conductivity and excellent in stability, and shows strong industrialization potential in the field of clean energy.

This invention discloses a method for preparing doped tin dioxide nanocrystals that can be highly dispersed in any water-to-alcohol ratio. The preparation method includes the following steps: (1) adding trimethylamine oxide to an aqueous solution containing tin halide to produce a white precipitate and stirring; (2) subjecting the mixture obtained in step (1) to a hydrothermal reaction at 120–200°C for 3–24 h, separating the solid and liquid phases after the reaction, and dispersing the solid phase in pure water, pure alcohol, or a water-to-alcohol mixture with any water-to-alcohol ratio to obtain a halogen-doped tin dioxide dispersion; (3) adding an organic base stabilizer to the halogen-doped tin dioxide dispersion and mixing to obtain halogen-doped tin dioxide nanocrystals that are highly dispersed in pure water, pure alcohol, or a water-to-alcohol mixture with any water-to-alcohol ratio. The preparation method of this invention is simple and inexpensive, broadens the application field of tin dioxide, and has important application value.

Provided are: oxide colloidal particles which contain rutile-type titanium oxide as a main component and in which the formation of anatase-type titanium oxide is effectively suppressed; a sol containing the oxide colloidal particles; and a method for producing the oxide colloidal particles. The problem is solved by oxide colloid particles (A) comprising Ti and Sn and having an average primary particle diameter of 5-300 nm and / or a primary particle diameter of 5-300 nm in terms of both D10 and D90 in the number-based cumulative particle size distribution, wherein the numerical value of (rutile-type tin dioxide content) / (rutile-type titanium oxide content) (mass ratio) calculated by the method below is 0.3-3.5% when expressed as a percentage: (rutile-type tin dioxide content) / (rutile-type titanium oxide content) (mass ratio) = ((intensity of rutile-type tin dioxide diffraction lines in a diffraction pattern obtained by powder X-ray diffraction in a 2θ range of 20.0°-80.0°) / 9.63) / ((intensity of rutile-type titanium oxide diffraction lines in the diffraction pattern obtained by powder X-ray diffraction in the 2θ range of 20.0°-80.0°) / 3.27).

The invention relates to tungsten-doped tin dioxide nano-powder, a preparation method thereof and application of the tungsten-doped tin dioxide nano-powder in a semiconductor type gas sensitive element. The preparation method of the tungsten-doped tin dioxide nano-powder comprises the following steps: dissolving a soluble tungsten compound and a soluble tin compound in an aqueous solution containing a surfactant, and adding a complexing agent to obtain a uniform metal ion mixed solution; adding a precipitant into the mixed solution under a stirring condition, and adjusting the pH value to 2-6 to precipitate the metal hydroxide precursor; performing aging, solid-liquid separation, washing and drying on the precipitate to obtain precursor powder; adding a dispersing agent into the precursor powder, and uniformly mixing; and calcining to obtain the tungsten-doped tin dioxide nano powder. The tungsten-doped tin dioxide nano-powder can be used for preparing a semiconductor type gas sensor, an ultraviolet detector, a lithium ion battery negative electrode material, a catalyst or a transparent conductive film.

A target material and its preparation method, hydrophilic film and product, wherein the target material comprises the following components: by mass percentage, 38%-48% titanium, 5%-10% copper, 6%-14% manganese, 4%-9% tungsten trioxide, 15%-21% titanium dioxide, 2%-8% silicon dioxide and 7%-13% tin dioxide. The hydrophilic film prepared using the target material described in this application has a more lasting hydrophilic effect. After 300 cycles of mud testing, the film still remains hydrophilic, and the film has excellent acid resistance, and the CASS 12H test can reach level 10. The film prepared using the target material described in this application has a good antibacterial effect, and the antibacterial rate against Escherichia coli and Staphylococcus aureus can reach 99.9%. The equipment and process used in the preparation method of the target material of this application are simple and common, easy to operate, and suitable for large-scale production.

This invention discloses a method for preparing tin dioxide hydrated colloidal precursors via dual-anode synchronous electrolysis, belonging to the field of electrochemical preparation technology of inorganic functional materials. The method includes the following steps: a) preparing an electrolyte containing 0.01 M hydrochloric acid and adjusting the initial pH value; b) using a high-purity tin plate as anode 1 and a titanium-based size-stabilized electrode as anode 2; using the titanium-based size-stabilized electrode as a common cathode; c) applying a DC voltage for constant-voltage synchronous electrolysis; anode 1 dissolves to generate stannous ions, anode 2 electrolyzes chloride ions to generate hypochlorous acid, and the hypochlorous acid instantly oxidizes the stannous ions to tetravalent tin ions in the bulk solution far from the cathode, forming a translucent tin dioxide hydrated colloidal precursor in situ in an acidic medium; d) drying the resulting colloid under reduced pressure and then calcining it at 200–250℃ to obtain high-purity nano-tin dioxide. This invention achieves integrated "dissolution-oxidation-gelation" through dual-anode synergy, avoiding the loss of hypochlorous acid during cathode reduction.

The invention relates to the field of electrode materials, in particular to a g-C3N4-based electrode material and a supercapacitor, and the g-C3N4-based electrode material is composed of g-C3N4 and a metal oxide; the metal oxide is loaded between layers and on the surface of the g-C3N4, the metal oxide is of a one-dimensional nanostructure, the invention further provides a preparation method of the g-C3N4-based electrode material, tin dioxide and g-C3N4 can have better dispersity after being compounded, agglomeration is avoided, the electrochemical performance is excellent, and the preparation method is suitable for industrial production. The method has a practical application prospect, and provides more thoughts and a larger selection space for people to select supercapacitor electrode materials in the future.

The present invention belongs to the field of electrode material technology, and in particular to a tin disulfide-helical carbon nanofiber composite material and its preparation method and application. The present invention mixes spiral carbon nanofibers, a tin source, an organic precipitant, an organic dispersant and an organic solvent to carry out a solvent thermal reaction, and then calcines the reaction product to obtain a tin dioxide-helical carbon nanofiber composite material, and then vulcanizes it in a sulfur vapor atmosphere to finally obtain a tin disulfide-helical carbon nanofiber composite material. The sulfide product prepared by the present invention not only has high purity and high crystallinity, but also has excellent structural stability and electrochemical performance under high current and long-term charge and discharge working conditions. At the same time, the method provided by the present invention does not need to wash and dry the sulfide product when preparing the sulfide product, the operating steps are relatively simple and easy to control, the production cost is greatly reduced, and it has a prospect for large-scale application.

The invention discloses a semiconductor hydrogen sensor preparation method based on HMDS gas phase heat treatment, which comprises the following steps: mixing an organic silicon precursor with a solvent, then adding nanoscale tin dioxide powder, mixing, fully grinding, then uniformly coating on a sensor substrate, forming a semiconductor hydrogen sensitive layer on the sensor substrate, and then carrying out high-temperature sintering treatment to obtain the semiconductor hydrogen sensor based on HMDS gas phase heat treatment. The preparation method comprises the following steps: adding stannic oxide particles to remove organic components and promote neck connection among the stannic oxide particles to obtain a sensor blank, putting the sensor blank into a quartz tube reactor, introducing hexamethyl disiloxane steam taking high-purity standard air as carrier gas, and carrying out gas-phase heat treatment on a sensitive layer under a heating condition to form a hydrophobic layer on the surface, thereby obtaining the surface-modified hydrogen sensor. Through the synergistic effect of gas phase surface modification and the like, the sensitivity and the response speed of the hydrogen sensor are remarkably improved, the selectivity and the environmental adaptability are enhanced, and the problems of water vapor interference, unstable response and insufficient mechanical strength in the prior art are effectively solved.

This invention relates to a nickel-manganese bimetallic hydroxide / oxide electrochromic thin film, its preparation, and its application. The electrochromic thin film of this invention is directly grown on the surface of fluorine-doped tin dioxide (FTO) conductive glass via a hydrothermal method. The specific steps are as follows: First, nickel source, manganese source, urea, and ammonium fluoride are dissolved in deionized water, then transferred to a hydrothermal reactor. An FTO conductive glass is placed in the reactor with its conductive side facing down. After a period of constant-temperature hydrothermal reaction, it is naturally cooled to room temperature. The FTO conductive glass is then removed from the reactor, cleaned, and dried to obtain the nickel-manganese bimetallic hydroxide electrochromic thin film. After calcination at a certain temperature, a nickel-manganese bimetallic oxide electrochromic thin film is obtained. Compared with single nickel oxide and manganese oxide, the NiMnLDH thin film of this invention exhibits a larger light modulation amplitude in the visible light region and higher transmittance in the faded state, making it applicable to electrochromism and related fields.

The invention relates to a method for preparing a three-dimensional mesoporous graphene / tin oxide composite material. The method comprises the following steps: (1) obtaining tin dioxide nanoparticles; (2) generating metal carbonate on the surfaces of the tin dioxide nano-particles to obtain a compound in which the tin dioxide nano-particles are coated with the metal carbonate; calcining to thermally decompose the metal carbonate to generate a metal oxide, so as to obtain a mesoporous compound; (3) depositing graphene on the surface of the mesoporous compound and in mesopores to obtain a graphene-coated mesoporous compound; and (4) carrying out acid pickling on the graphene-coated mesoporous compound to remove the metal oxide so as to obtain the three-dimensional mesoporous graphene / tin oxide composite material. The three-dimensional mesoporous graphene / tin oxide composite material disclosed by the invention has excellent electrochemical performance, and can be used for improving the charge-discharge cycle stability of a lithium / sodium ion battery negative electrode material.

The invention provides an electron transport layer precursor, a trans-perovskite cell and a preparation method, and the preparation method of the electron transport layer precursor comprises the following steps: dispersing tin dioxide nanoparticles in an organic solvent, adding carboxylic acid into the organic solvent to adjust the pH value to 5.5-6.5, and then carrying out ultrasonic dispersion to obtain the electron transport layer precursor. Tin dioxide nanoparticles are dispersed in an organic solvent by using carboxylic acid, the pH value is adjusted to 5.5-6.5, carboxyl in an acidic medium can be coordinated with Sn-OH groups on the surface of tin dioxide, and residual carboxylate ions (-COO-) can provide electrostatic repulsive force, so that the dispersion of tin dioxide is facilitated; meanwhile, carbon chains of carboxylic acid molecules can provide certain steric hindrance, and agglomeration of tin dioxide nanoparticles is avoided.

The invention relates to a P-WO3 / SnO2 composite material derived based on phosphotungstic acid as well as a preparation method and application of the P-WO3 / SnO2 composite material. According to the material, a precursor solution containing tin chloride and phosphotungstic acid (HPW) is subjected to electrostatic spinning, and the fiber material with a hollow pipeline structure is prepared by means of a high-temperature calcination process. In the preparation process, a tungstate radical component in phosphotungstic acid is converted into tungsten trioxide (WO3), and the tungsten trioxide (WO3) and stannic oxide (SnO2) form a heterojunction interface. Meanwhile, phosphorus atoms are doped into material crystal lattices, a local electron regulation and control effect is generated, and the electron transfer capacity is enhanced. By adopting a synergistic effect of constructing a heterojunction interface and doping phosphorus element, an electric field built in the interface is effectively enhanced, and oxygen vacancies and an electronic structure of the material are regulated and controlled, so that the gas-sensitive response performance to triethylamine (TEA) gas is remarkably improved. The invention provides a new technical approach for constructing the heterojunction by using the complex oxysalt and cooperatively improving the gas sensing performance in combination with element doping.

The invention relates to the technical field of sodium battery negative electrodes, and particularly discloses a phenolic resin-based tin-carbon negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: mixing a phenolic substance with an aldehyde substance, adding a solid tin source which is tin powder or / and tin dioxide powder, uniformly stirring, adding a catalyst ammonia water, heating for reaction, and cooling to room temperature to obtain the phenolic resin-based tin-carbon negative electrode material. The viscosity is monitored in the reaction process, when the viscosity is larger than or equal to 800 mPa.s, discharging, drying, crushing and grinding are conducted, and finally carbonization is conducted in the inert atmosphere. The phenolic resin-based tin-carbon negative electrode material with good charge-discharge performance is prepared by taking the tin powder or / and the tin dioxide powder as the tin source, so that the cost is reduced, meanwhile, the risks of waste water generation and human body injury caused by the use of a liquid tin source are avoided, and the preparation method does not generate obvious adverse effects on a kiln and has a great popularization prospect.

The invention discloses a silicon carbide-based carbon monoxide gas sensor material, a chip and a preparation method thereof, and belongs to the technical field of MEMS sensors. The sensor chip mainly takes silicon carbide as a substrate, utilizes the heterojunction effect of titanium dioxide and tin dioxide, and is combined with Pt noble metal as a catalyst. The polystyrene microspheres are used as a template to prepare a multi-layer three-dimensional porous structure, so that the gas adsorbability and active sites are increased, the sensitivity of the gas sensor is improved, and the gas sensor has the characteristics of high temperature resistance, high stability, sensitive response and the like.

This invention provides a gas-phase method and apparatus for preparing high-purity nano-tin dioxide powder, comprising the following steps: a tin source is vaporized using mid-frequency plasma to form tin vapor; the tin vapor is reacted with oxygen in an oxidation growth zone, while simultaneously injecting gadolinium oxide nanoaggregate aerosol; and the reaction is carried out through the surface oxygen vacancies and Gd2+ of the gadolinium oxide nanoaggregates. 3+ The coordination adsorption of tin-oxygen species at specific sites induces heterogeneous nucleation, generating nano-sized tin dioxide particles. These nano-sized tin dioxide particles are then subjected to in-situ surface functionalization treatment at 20-60°C with ultraviolet light at wavelengths of 185 nm and 254 nm, followed by the introduction of ozone at a concentration of 10-100 ppm for a residence time of 60-120 s. The surface-functionalized nano-sized tin dioxide particles are collected using an electrostatic-assisted method and dried to obtain high-purity nano-tin dioxide powder. This invention refines grain size, optimizes particle dispersibility, and achieves efficient particle collection. The resulting powder possesses both ultra-fine particle size and high purity, meeting the application requirements of cutting-edge new materials.