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419results about How to "Improve gas sensing performance" patented technology

Binary carbon material-conductive polymer composite nano gas-sensitive thin film and preparation method thereof

ActiveCN103897183AEnhanced conductivity and gas-sensing propertiesExcellent gas sensing performanceCvd grapheneCarbon nanofiber
The invention discloses a binary carbon material-conductive polymer composite nano gas-sensitive thin film and a preparation method thereof. The binary carbon material-conductive polymer composite nano gas-sensitive thin film is a composite thin film formed by self-assembling a binary carbon material and a conductive polymer material through chemical polymerization, the binary carbon material is a combination of any of a graphene material and a carbon nanotube as well as a carbon nanofiber, nano porous carbon or nano graphite. The composite nano thin film with excellent gas-sensitive characteristic can be prepared by fully utilizing the excellent conductivity and high specific surface area of the carbon nano material and the peculiar response characteristic of the conductive polymer, playing the synergistic and supplementary roles generated among different materials and combining an orderly controllable self-assembled film forming method. The binary carbon material-conductive polymer composite nano gas-sensitive thin film and the preparation method thereof can open up a new approach for the sensitive thin film for a gas sensor which is high in performance, low in cost and capable of working at room temperature.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

ZnO/SnO2 nano composite gas-sensitive material with flower-shaped grading structure and preparation method of material

The invention provides a ZnO / SnO2 nano composite gas-sensitive material with a flower-shaped grading structure. The ZnO / SnO2 nano composite gas-sensitive material is prepared by the following steps: dripping a sodium hydroxide water solution into an ethanol solution of cetyl trimethyl ammonium bromide and stannous chloride dihydrate under electromagnetic stirring; after dripping, preparing a precursor solution by the continuous electromagnetic stirring; adding the precursor solution into a reaction kettle, reacting at 130 DEG C; carrying out centrifuging on a reactant, washing and drying to obtain a flower-shaped stannous oxide sacrifice template; adding the flower-shaped stannous oxide sacrifice template into a zinc acetate solution; agitating and carrying out ultrasonic treatment; removing a solvent to obtain a ZnO / SnO2 precursor; and carrying out heat preservation on the ZnO / SnO2 precursor for 2-4 hours in an air atmosphere of 700 DEG to obtain the composite gas-sensitive material. According to the ZnO / SnO2 nano composite gas-sensitive material with the flower-shaped grading structure, the controllable preparation of the composite gas-sensitive material on the appearance and components can be realized; the mass percent content of zinc oxide in the composite gas-sensitive material is 5%-15%; a flower shape is assembled by sheet-shaped tin dioxide and zinc oxide nano particles; the ZnO / SnO2 nano composite gas-sensitive material has a good gas sensitive performance and has a wide application prospect in the aspect of manufacturing a novel high-efficient gas sensor.
Owner:HENAN POLYTECHNIC UNIV

Method for preparing ferroferric oxide nano-piece through microwave method

The invention relates to a method for preparing ferroferric oxide nano-piece through a microwave method, which belongs to the field of preparation of nano-material through a wet chemical method. The method comprises the following steps of: preparing a ferric salt solution by using ethylene glycol by using a soluble trivalent ferric salt as a raw material , adding the sodium acetate and a surfactant in the ferric salt solution, evenly stirring, and irradiating by using microwave to generate ferroferric oxide, filtering and washing the product, drying the product at a constant temperature in air to obtain the ferroferric oxide nano-piece material. The ferroferric oxide nano-piece material synthesized by the method has a thickness of 100nm below as well as the length and width of 1-10microns. The invention has the advantages of high purity of the prepared ferroferric oxide nano-piece, simple synthetic line, short period of microwave reaction of only tens of minute and easy control of the whole process, meets the demands of practical production, and has god application prospect in the fields of catalysis, biological medicine, energy and environment and the like.
Owner:HUAZHONG NORMAL UNIV

Preparation method of silver-doped nano tin dioxide powder

The invention belongs to the technical field of preparation of tin dioxide powder, and relates to a preparation method of silver-doped nano tin dioxide powder. The preparation method comprises the following steps of: firstly adding citric acid solution, a surface active agent and ammonia water sequentially into mixed solution of soluble tin salt and soluble silver salt, and adjusting the pH value of a reaction system to 2.5-11, and under the action of constant-temperature magnetic stirring, generating precursor sol; then, adding the precursor sol into a hydrothermal reaction kettle, putting the hydrothermal reaction kettle in a drying oven, carrying out hydrothermal reaction, taking out the hydrothermal reaction kettle after hydrothermal reaction, cooling, and sampling; and finally, cleaning, drying and grinding to prepare a finished nano tin dioxide powder product. The tin dioxide powder prepared by the method has the advantages of fewer granularity, narrow distribution range and good dispersity; and a gas sensor based on the tin dioxide powder material has good detection performance for fault gas in transformer oil.
Owner:PONOVO POWER

Gas sensitive element by taking single-walled carbon nanotube/phthalocyanine composite material as ammonia-sensitive material and preparation method thereof

The invention discloses a gas sensitive element by taking a single-walled carbon nanotube / phthalocyanine composite material as an ammonia-sensitive material and a preparation method thereof and relates to a gas sensitive element for measuring ammonia concentration and a preparation method thereof. The invention aims to solve the problems that a gas sensitive element by taking a single single-walled carbon nanotube as an ammonia-sensitive material is poor in reversibility and a gas sensitive element by taking metal phthalocyanine as an ammonia-sensitive material is high in resistance value. The gas sensitive element by taking the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material consists of an interdigital electrode and a single-walled carbon nanotube / phthalocyanine composite material. The preparation method comprises the following steps: 1. preparing a carboxylated single-walled carbon nanotube; 2. preparing the single-walled carbon nanotube / phthalocyanine composite material; and 3. dispensing to obtain the gas sensitive element by taking the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material. The invention can be used for preparing the gas sensitive element by taking the single-walled carbon nanotube / phthalocyanine composite material as the ammonia-sensitive material.
Owner:HEILONGJIANG UNIV

[Alpha]-phase ferric oxide porous core-shell microspheres and controllable synthetic preparation method thereof

The invention discloses [alpha]-phase ferric oxide porous core-shell microspheres and a controllable synthetic preparation method thereof. The [Alpha]-phase ferric oxide microspheres having porous core-shell structures can be prepared through a hydrothermal method with an inorganic soluble ferric salt being a raw material, deionized water and anhydrous alcohol being solvents and at a certain temperature for a certain time. The microspheres are 3 [mu]m in the average diameter. Cores and shells are composed of nano particles, wherein the average diameter of the nano particles is 200 nm and the average thickness of the shells is 100nm. A plurality of pores with pore diameters being 40nm are uniformly distributed on the surface of each shell with of a plurality of pores with pore diameters being 40nm. The preparation method is free of any dispersing agent and surfactant, and subsequent processes are convenient since a template is not needed. The preparation method is simple in technology, short in reaction time, large in output, is environmental-friendly and cheap in raw materials, is beneficial to large scale industrial production and the porous core-shell microspheres can be used for a lithium ion battery electrode material and a gas-sensitive material.
Owner:JIANGSU UNIV

Preparation method for SnO2/ZnO compound micro-nano fibers and product thereof

The invention discloses a preparation method for SnO2 / ZnO compound micro-nano fibers. The preparation method comprises the following steps: firstly preparing Zif-8 by zinc salt and 2-methylimidazole; adding ammonium citrate dibasic, octadecylamine and ethyecellulose to prepare the Zif-8 solution; preparing tin salt solution by tin salt and polyvinylpyrrolidone, and slowly dropwise adding to the Zif-8 solution, to obtain precursor spinning solution, and executing the electrostatic spinning and heat treatment to obtain a final product. The body of the prepared SnO2 / ZnO compound micro-nano fibers is formed by SnO2 and ZnO nano-particle combination, and the surface has the SnO2 nano-particles. According to the preparation method, a zinc-based metal organic framework material is introduced into the SnO2 micro-nano fibers, the synthetic process is simple, the reaction parameters are easily set, and the ingredients of the obtained product are adjustable. The obtained SnO2 / ZnO compound micro-nano fibers have the important application value in the fields, such as air-sensitive and photocatalysis.
Owner:UNIV OF JINAN

Preparation method of titanium dioxide-tin dioxide nano-sosoloid material

The invention discloses a preparation method of a titanium dioxide-tin dioxide nano-sosoloid material. The preparation method comprises the following steps: enabling a soluble tin (IV) salt, citric acid and a titanium (IV) salt to react in ethylene glycol till the a transparent precursor sol is formed; enabling the precursor sol to perform a closed reaction for 6-20 hours in a reaction kettle at the temperature of 150-220 DEG C; and washing and drying a reaction product. According to the preparation method disclosed by the invention, hydro-thermal treatment is directly performed on the precursor sol obtained by a sol-gel method, rutile type nano-tin dioxide-titanium dioxide (Ti1-xSnxO2, x is not less than 0.15 and less than 1) sosoloid material with the different titanium-tin weight ratio can be directly prepared without high-temperature sintering, the average particle size is 9-11nm, the particle size distribution is uniform, the specific surface area is large, the photocatalytic ability or the gas-sensing property can be improved, the agglomeration of nano-particles caused by sintering can be avoided, and the process energy consumption can also be effectively reduced; and furthermore, the technical principle is simple, the operation is simple and convenient, and the requirements on equipment are low.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Planar flexible room-temperature NO<2> sensor based on three-dimensional MXene folded ball/ZnO composite material and preparation method thereof

The invention discloses a planar flexible room-temperature NO<2> sensor based on a three-dimensional MXene folded ball / ZnO composite material and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor is composed of a polyimide flexible substrate having an Au interdigital electrode and three-dimensional MXene folded ball / ZnO composite material sensitive electrodes prepared on the interdigital electrode and the substrate. According to the planar flexible room-temperature NO<2> sensor based on the three-dimensional MXene folded ball / ZnO composite material andthe preparation method thereof provided by the invention, with the MXene material as a basis, the MXene is treated via an ultrasonic spraying method to prepare the anti-aggregating three-dimensionalMXene folded ball, thus achieving the advantages of being anti-aggregating, and maintaining a large specific surface area of the MXene; meanwhile, the oxidation is composited, and a ZnO nanoparticle is increased on a surface of the three-dimensional MXene folded ball, so that a sensing site is increased; and compared with a two-dimensional MXene and pure three-dimensional MXene folded ball, the sensor prepared based on the three-dimensional MXene folded ball / ZnO composite material obtains higher NO<2> sensing property, and has very good selectivity, resilience and bendability.
Owner:JILIN UNIV

Preparation method of hybridized hierarchical structure sensitive thin-film sensing device based on two-dimensional material

The invention discloses a preparation method of a hybridized hierarchical structure sensitive thin-film sensing device based on a two-dimensional material. The sensing device comprises a single crystal semiconductor substrate, an insulation layer, an interdigital electrode layer, a first PDDA film layer, a reduction-oxidation graphene film layer, a second PDDA film layer and a hierarchical structure ZnO-PSS thin film which are sequentially overlapped according to a preparation order. The preparation method mainly comprises the following steps: preparing an interdigital electrode device; preparing a film layer material required by the sensing device, and preparing the hybridized hierarchical structure sensitive sensing device by adopting a layer-by-layer self-assembling method. The preparation method has the advantages of fully utilizing characteristics of large specific area, low electronic noise, good semiconductor property and negative electricity of reduced-oxidized graphene and combining the structure characteristic of a hierarchical structure zinc oxide to prepare a hybridized hierarchical structure sensitive thin film; the process is simple, the repeatability is good, and the prepared sensing device can be used in the field of gas detection.
Owner:TSINGHUA UNIV

Multi-stage structure nanometer In2O3/graphene composite and preparation method and application thereof

The invention discloses a multi-stage structure nanometer In2O3 / graphene composite and a preparation method and application thereof. The composite is of a brick-shaped structure. The preparation method includes the steps of making indium salt capable of being dissolved in ethylene glycol, reduced graphene oxide and precipitator ammonium hydroxide have a chemical reaction under the microwave heating conditions on the gas-liquid interface formed by an ethylene glycol solution and ammonium hydroxide steam, bringing away the reaction product through a rolling ethylene glycol solution, and continuing to generate a new product. The composite has the advantages that original nanometer particles of nanometer In2O3 / graphene prepared through a microwave gas-liquid interface method are small and uniform; the brick-shaped nanometer structure is formed with the original nanometer particles through self-assembling, and the multi-stage structure nanometer In2O3 / graphene composite has good gas-sensitive performance for nitric oxide gas at the temperature of 100 DEG C and is high in selectivity.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY

Gas sensor based on mesoporous indium oxide gas-sensitive material and preparation method

InactiveCN103353470AEasy to operateAtmospheric Sensitive Specific Surface AreaMaterial analysis by electric/magnetic meansIndiumMethanol
The invention relates to a gas sensor based on a mesoporous indium oxide gas-sensitive material and a preparation method. The mesoporous indium oxide gas-sensitive material is used as a sensing layer of the sensor. According to the invention, mesoporous indium oxide prepared by using a nanometer casting method is used as the gas-sensitive material, the concentration of prepared coating slurry is 0.02 to 0.2 g / mL, and the thickness of the sensing layer of the gas sensor prepared through coating is 500 nm to 300 mu m. The preparation method for the gas sensor is simple to operate and easy to realize; the gas sensor has a large gas-sensitive specific surface area, greater than 150 m<2> / g; the preparation method is favorable for improving gas-sensitive performance of the prepared gas sensor, and the prepared gas sensor has optimal ethanol sensing performance of greater than 18, optimal acetone sensing performance of greater than 15 and optimal methanol sensing performance of greater than 12, all higher than the performance of frequently used industrial gas sensors.
Owner:TIANJIN UNIV

Room temperature nitrogen dioxide sensor preparation method based on reduced graphene-semiconductor

The present invention relates to a room temperature nitrogen dioxide sensor preparation method based on a reduced graphene-semiconductor. The preparation method comprises: adding graphite and NaNO3 into H2SO4, adding KMnO4, carrying out a reaction in a constant temperature water bath pot, adding deionized water, terminating the reaction, adding a H2O2 solution and hydrochloric acid to obtain an oxidized graphene suspension, dissolving inorganic salt powder in deionized water, adding the obtained solution to the oxidized graphene suspension, drying in a high pressure kettle to obtain corresponding powder, preparing an interdigital electrode and a wiring terminal on the front surface of a substrate by using a monocrystal silicon wafer Si as an insulating substrate, and preparing a reduced graphene-semiconductor composite coating just above the interdigital electrode. According to the present invention, the defects of sensor power consumption increasing, sensor service lifer shortening, detection safety risk increasing and the like in the prior art are overcome with the preparation method of the present invention; and the characteristics of large specific surface area, fast electron transport, good light absorption, fast response, fast recovery and lower working temperature of the reduced graphene are utilized.
Owner:YANGZHOU UNIV

Copper oxide-tin oxide core-shell nanowire structure-based gas sensitive nano material, preparation process and application thereof

The invention discloses a copper oxide-tin oxide core-shell nanowire structure-based gas sensitive nano material, a preparation process and application thereof. A copper oxide-tin oxide core-shell nanowire is prepared by adopting a chemical solution method with extremely simple synthesis conditions, and in combination with an atomic layer deposition technology of a shell layer, a copper oxide / tinoxide core-shell nanowire is obtained. Compared with the existing preparation process, the preparation process has the advantages of high reproducibility, high yield, high preparation efficiency, large-scale production and the like. The p-n heterojunction-based core-shell structure constructed by the preparation process has substantially improved sensitivity when applied to gas sensing, and the response time and recovery time are substantially reduced, thereby showing more excellent gas sensitive performance. The gas sensitive nano material disclosed by the invention can detect trace organic volatile gas and has excellent selectivity to formaldehyde gas; a solid technical support is provided for developing a gas sensor with high sensitivity and high stability in the gas monitoring field.
Owner:FUDAN UNIV

Method for manufacturing composite film gas sensor

The invention relates to the technical field of manufacturing gas sensors, in particular to a method for manufacturing a composite film gas sensor. The method is characterized by comprising the following steps of: 1, performing acid treatment on MWCNT, then adding and dispersing the MWCNT into an organic solvent, treating the mixture to obtain a fully-mixed suspension, and spin-coating the suspension to a tin target and a tungsten target of a radio frequency reaction magnetron sputtering device respectively; 2, manufacturing a heater and an interdigital electrode of the sensor on a silicon chip or a ceramic tube; 3, using a radio frequency reaction magnetron sputtering technique to sputter a layer of SnO2-MWCNT film on the area of the interdigital electrode, and sputter a layer of WO3-MWCNT film on the SnO2-MWCNT film to form a composite film; 4, sintering the silicon chip or the ceramic tube attached with the film in a high-temperature furnace; and 5, welding a platinum wire between the heater of the silicon chip or the ceramic tube and an outer leading wire post of the sensor and welding a platinum wire between the electrode of the silicon chip or the ceramic tube and the outer leading wire post of the sensor respectively. The SnO2-WO3-MWCNT composite film gas sensor manufactured by the method has a high gas-sensing property and a good using effect.
Owner:FUZHOU UNIV

Oxide/silicate mineral fiber nano composite air-sensitive film and preparation method thereof

InactiveCN101609059AAvoid breakingEnhanced gas adsorption capacityMaterial resistanceFiberPalygorskite
The invention discloses an oxide / silicate mineral fiber nano composite air-sensitive film and a preparation method thereof, belonging to the technical field of functional composite material. The oxide / silicate mineral fiber nano composite air-sensitive film comprises silicate mineral fiber nano material substrate and a nano oxide powder layer coated on the surface of the silicate mineral fiber nano material substrate; wherein silicate mineral fiber nano material is any one in the minerals such as chrysotile, amphibole, meerschaum and palygorskite; and nano oxide powder is any one of nano stannic oxide, nano ferric oxide, nano zinc oxide and nano copper oxide. Compared with the prior art, the oxide / silicate mineral fiber nano composite air-sensitive film obtained by adopting the method has the tensile strength being improved from 10-50MPa to 100-3000MPa and the fracture toughness be enhanced from 3-5MPa.m1 / 2 to 100-500MPa.m1 / 2; the air-sensitive stability and the service life are improved by 80-100%.
Owner:SOUTHWEAT UNIV OF SCI & TECH

Tin dioxide nanoflower with hollow structure and preparation method of tin dioxide nanoflower

The invention discloses a tin dioxide nanoflower with a hollow structure and a preparation method of the tin dioxide nanoflower, belonging to the technical field of nanomaterials and solving the technical problems that a preparation method of tin dioxide nanoparticles is complex in operation and high in cost and tin dioxide nanoparticles with complex appearances cannot be prepared in the prior art. The nanoflower is composed of more than one subunit, wherein all the subunits share the same geometric central point; each subunit is composed of a hollow tin dioxide sheet layer and a solid tin dioxide sheet layer which are respectively of a regular hexagonal structure; the hollow tin dioxide sheet layer is composed of a shell and an inner cavity; the solid tin dioxide sheet layer is parallel to the hollow tin dioxide sheet layer and shares the same geometric central point with the hollow tin dioxide sheet layer; and the solid tin dioxide sheet layer is arranged in the hollow tin dioxide sheet layer to divide the inner cavity into two regions. The nanoflower is of a hollow hierarchical structure and is good in monodispersity and crystallinity, large in specific surface area and favorable in gas sensibility.
Owner:JILIN UNIV

Gas sensing material of cuprous oxide and stannic oxide micro-nano heterogeneous medium array structure and preparing method thereof

The invention relates to a gas sensing material of cuprous oxide and stannic oxide micro-nano heterogeneous medium array structure and a preparing method thereof, and belongs to the technical field related to gas sensing materials. The structure of the gas sensing material is a film material formed by periodically alternately assembling Cu2O and SnO2 which are parallel in elongated shapes, and the film material is generated on a silicon chip substrate, a Cu2O material is stacked thickly to form a protuberance portion, and a SnO2 material is stacked thinly to form a low ebb portion. The preparing method comprises parallelly placing two copper foil electrodes on a silicon substrate, dripping electrolyte prepared by copper nitrate and stannous chloride between the electrodes, covering a cover glass, refrigerating, solidifying and applying half-sine wave voltage, and enabling Cu2O and SnO2 to precipitate periodically and alternately. The gas sensing material of the heterogeneous medium array structure has gas sensing characteristics, the sensitivity of gas sensing elements is high at a room temperature because the gas sensing material has stable ordered heterogeneous medium structure, the service life is longe, simultaneously energy is saved and the environment is protected.
Owner:JILIN UNIV

Preparation method of aluminum-doped tin dioxide flower-like micro-sphere/nano-rod gas sensitive material

InactiveCN103553119ASimple processThe advantage of gas sensitivity is obviousMaterial nanotechnologyTin oxidesTin dioxideMicro structure
The invention discloses a preparation method of an aluminum-doped tin dioxide flower-like micro-sphere / nano-rod gas sensitive material, which is characterized by comprising the following steps of (1) dissolving tetrachlorostannane pentahydrate and aluminum trichloride hexahydrate at a certain proportion into absolute ethyl alcohol, and dissolving a certain amount of sodium hydroxide into deionized water; (2) mixing the solution under the effect of a magnetic stirrer, and stirring at a medium speed for 20-30 minutes; (3) transferring the stirred solution into a reaction kettle, reacting for a certain time at the set temperature, and naturally cooling to room temperature; (4) performing centrifugal washing and drying to obtain doped tin dioxide powder. The gas sensitive material is of two micro structures including flower-like micro-sphere and nano-rod. The manufactured aluminum-doped SnO2 surface type gas sensing element has excellent sensitivity against hydrogen at a relatively low working temperature of 200-300 DEG C, and the highest sensitivity reaches 97.6% (the upper limit of sensitivity is 100%). By adopting the method disclosed by the invention, the prepared gas sensitive material is simple to prepare and has excellent gas sensitivity, thereby being an ideal hydrogen sensitive material.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Nitrogen dioxide gas sensor based on SnSe2/SnO2 heterojunction as well as preparation process and application thereof

The invention belongs to the technical field of a nanometer material, and provides a nitrogen dioxide gas sensor based on a SnSe2 / SnO2 heterojunction as well as a preparation process and application thereof. The nitrogen dioxide gas sensor based on the SnSe2 / SnO2 heterojunction mainly consists of a gas sensitive material and a heating base plate, wherein the gas sensitive material is coated on thesurface of the heating base plate; the coating thickness is 1 mum to 100 mum; the gas sensitive material is a heterojunction composite nanometer material formed by ingredients of tin diselenide and tin dioxide. A hot oxidization method is used for obtaining the novel heterojunction composite nanometer material; the raw materials can be conveniently obtained; the price is low; the heterojunction preparation process is simple; the scheme beings to a two-dimensional semiconductor heterojunction preparation scheme with the advantages of low equipment investment and simple technical flow process.The work temperature of nitrogen dioxide made of the tin diselenide and tin dioxide heterojunction composite nanometer material is 120 DEG C; the material and silicon base microelectron phase integration can be realized.
Owner:DALIAN UNIV OF TECH

Palladium-doped stannic oxide wrapped carbon nano tube as well as preparation method and application of nano tube

The invention discloses a palladium-doped stannic oxide wrapped carbon nano tube which is prepared by using a gel-sol method. The carbon nano tube is structurally prepared by wrapping the surface of the carbon nano tube with palladium-doped stannic oxide crystal (Pd / SnO2), and the method comprises the following steps: dispersing the carbon nano tube into super-pure water in an ultrasonic mode, adding a stannic chlori precursor, dispersing in the ultrasonic mode again, subsequently adding a sodium tetrachloropalladate solution, uniformly stirring, mixing, adjusting the pH value to be 7-9, preserving for 0.2-36 hours at 30-200 DEG C so as to obtain milk white gel, washing and drying the gel, subsequently calcining at 200-700 DEG C so as to prepare the palladium-doped stannic oxide wrapped carbon nano tube. Due to adoption of noble metal and doping of the carbon nano tube, the gas-sensitive property of a stannic oxide-based gas sensor is greatly improved, the response and recovery time is shortened, and the low operation temperature is optimal.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

Gas-sensor nanometer sensitive material, slurry with gas-sensor nanometer sensitive material, preparing method of gas-sensor nanometer sensitive material, preparing method of slurry and application of gas-sensor nanometer sensitive material

The invention relates to a gas-sensor nanometer sensitive material, slurry with the gas-sensor nanometer sensitive material, preparing of the gas-sensor nanometer sensitive material, preparing of the slurry and an application of the gas-sensor nanometer sensitive material. A preparing method of the gas-sensor nanometer sensitive material includes the following steps that 1, stannate is added into ultrapure water and subjected to ultrasonic dispersion, a stannate solution is obtained, a urea ethanol solution is added, ultrasonic processing continues, an obtained mixed solution is transferred into a hydrothermal reaction kettle, after reaction is completed, cooling is carried out, and bottom precipitate is collected, centrifugally washed, arranged in a dryer and dried; 2, nanometer SnO2 hollow sphere powder obtained after drying is added into distilled water to be subjected to ultrasonic dispersion, a Pd(NO3)2 solution is dropwise added under the stirring condition, ammonium hydroxide is added till the pH of the mixed solution ranges from 9 to 12, the mixture is stirred at the indoor temperature, bottom precipitate is centrifugally collected, washed to be neutral and dried, and finally Pd-doping nanometer SnO2 hollow spheres are obtained. The gas-sensor nanometer sensitive material, the slurry, the preparing and the application have the advantages that the preparing methods are simple, the quantity of introduced foreign ions is small, the yield is high, volume production is facilitated, the specific area of the material is large, dispersity is good, and high sensitivity and short response recovery time are achieved.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

Method for preparing porous nanometer alpha-Fe2O3 hollow spheres and application of hollow spheres to low-temperature alcohol sensitivity

The invention relates to a method for preparing porous nanometer alpha-Fe2O3 hollow spheres and application of the hollow spheres to low-temperature alcohol sensitivity. The porous nanometer alpha-Fe2O3 hollow sphere material is prepared by performing a hydrothermal process on cheap Fe(NO3)3.9H2O, H2C2O4, CO(NH2)2 and deionized water serving as initial raw materials, drying, roasting and the like. In the prepared porous nanometer alpha-Fe2O3 hollow spheres, the average particle size of alpha-Fe2O3 particles is 30nm, the diameter of the hollow spheres is about 1mu m, the pore size distribution is concentrated in the range of 5 to 20nm, and a large number of pores have the size of 10nm. The invention discloses a method for preparing the porous nanometer alpha-Fe2O3 hollow sphere material and an application method of the material to the low-temperature alcohol sensitivity. The method has the advantages that: the alpha-Fe2O3 hollow sphere gas-sensitive material is prepared by a one-pot non-template method, and the method is easy to operate, low in cost, light in environmental pollution, low in energy consumption and high in controllability; in the prepared porous alpha-Fe2O3 hollow sphere material, the alpha-Fe2O3 particles are nanoscale, and the formed hollow spheres have uniform sizes; the prepared gas-sensitive material has high gas sensitivity to ethanol, low operating temperature and high selectivity; and the method is good in industrial application prospect.

Vanadium and palladium-codoped nanometer titania gas-sensitive material as well as preparation method and applications thereof

The invention relates to a vanadium and palladium-codoped nanometer titania gas-sensitive material as well as a preparation method and applications thereof. The preparation method of the codoped nanometer titania gas-sensitive material comprises the steps of: taking nanometer titania as a matrix, and doping 0.5-1.5mol% of vanadium and 1.0-3.5mol% of palladium, mixing a Pd(NO3)2 solution with a vanadium triisopropoxy oxide alcohol solution and dropwise adding the mixture into a tetrabutyl titanate ethylene glycol solution to obtain gel, drying, grinding and calcining to obtain the vanadium and palladium-codoped nanometer titania gas-sensitive material, wherein the particle size of the vanadium and palladium-codoped nanometer titania ranges from 8 to 15nm. The invention further provides a preparation method of the material. The gas-sensitive material is used for a gas-sensitive sensor for detecting chlorobenzene, is high in sensitivity, good in selectivity, short in response-restoration time, and beneficial to realizing the fast detection of the chlorobenzene.
Owner:QUFU NORMAL UNIV

Intelligent ultralow-concentration monitoring device for gaseous pollutants discharged by thermal power plant

The invention discloses an intelligent ultralow-concentration monitoring device for gaseous pollutants discharged by a thermal power plant. The intelligent ultralow concentration monitoring device comprises a smoke-dust separator, a smoke cooling module, a smoke testing cavity, a graphene-based gas sensor array, a multi-channel data acquisition module, an intelligent detecting system, a LABVIEW terminal display system and a wireless transmitting and monitoring system. According to the device, smoke discharged by the thermal power plant is subjected to dust removal through the smoke-dust separator and then cooled through the smoke cooking module, and enters the smoke testing cavity provided with the graphene-based gas sensor array, array signals are acquired by the multi-channel data acquisition module, smoke component concentrations are output through the intelligent detecting system with a genetic particle swarm-radial basis neural network as a core, the detected concentrations are remotely transmitted to the environment protection supervision department or a mobile phone monitoring terminal of working personnel through the wireless transmitting and monitoring system. The concentration monitoring device for smoke discharge components of the thermal power plant has the advantages of being low in detection limit, high in sensitivity and stability, capable of achieving online detection in real time and the like.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Method for preparing porous silicon nanowire NO2 gas sensor

The invention discloses a method for preparing a porous silicon nanowire NO2 gas sensor belonging to the technical field of gas sensors. The method comprises the following steps: catalyzing chemical corrosion by utilizing metal silver, and preparing a porous silicon nanowire on the surface of a silicon chip; modifying an Ag nanoparticle layer on the surface of the porous silicon nanowire by virtue of a metal salt solution soaking or magnetron sputtering method, connecting the obtained film sample to an Ag electrode and an Ag wire, wherein the sample can serve as a gas-sensitive sensor for detecting the NO2 gas. When NO2 is introduced into a gas environment at a certain voltage, the resistance value of the sensor is obviously reduced; and after the NO2 gas is removed and air is introduced again, the resistance value of the sensor can rise again. The NO2 gas sensitive sensor prepared by the method has the characteristics of high sensitivity, low cost and high environmental stability, the resistance value of the device can be over 30 percent in the NO2 gas, and the sensor has high actual application value.
Owner:TSINGHUA UNIV

Composite gas sensitive material, gas sensor and preparation method thereof

The invention provides a composite gas sensitive material, a gas sensor and a preparation method thereof and relates to the technical field of nanocomposite materials. A preparation method of the composite gas sensitive material comprises the steps of using a template agent for assembling a graphene material into a three-dimensional framework structure, making a metal salt react with an organic ligand on the surface of the three-dimensional framework structure, and enabling metal organic framework crystals to grow; removing the template agent and then carrying out calcining. A pore structure of the prepared composite gas sensitive material includes micropores, mesopores and macropores. The preparation method of the gas sensor comprises the steps of attaching a dispersion liquid of the composite gas sensitive material to an electrode surface and carrying out drying. The composite gas sensitive material improves the gas sensitive performance of the gas sensor.
Owner:NINGBO GRAPHENE INNOVATION CENT CO LTD

Overlong vanadium pentoxide nanowire harness with hierarchical structure and preparation method thereof

The invention provides an overlong vanadium pentoxide nanowire harness with a hierarchical structure and a preparation method thereof. The length of the wire harness is not shorter than 10 cm; the diameter of the wire harness is 1-3 microns; the wire harness comprises parallel overlong nanowires; the diameters of the nanowires are 20-30 nm and the lengths of the nanowires are longer than 100 microns to 1 mm. The preparation method comprises the following steps: preparing a vanadium pentoxide sol by using a melting and quenching method; putting 40 ml sol to a reaction kettle; reacting the sol for 2-4 days under a condition of 160-200 DEG C so as to obtain a suspension containing overlong vanadium pentoxide nanowires; enabling a slender glass fiber to extend into the vanadium pentoxide nanowire suspension; lifting the slender glass fiber at a constant speed so as to obtain the wire harness; drying the obtained wire harness; carrying out heat treatment on the wire harness under an air atmosphere under a condition of 400-600 DEG C; and finally obtaining the overlong vanadium pentoxide nanowire harness with the hierarchical structure. A gas sensitive device assembled by using materials has the advantages of rapid response, good stability, sensitivity of 2.6 and low working temperature of 60 DEG C.
Owner:WUHAN UNIV OF TECH

Preparation method for hierarchical hollow cubic stannic oxide nanometer particle

InactiveCN106629824AExcellent synthetic structureNot easy to reuniteTin oxidesTin dioxideMaterials preparation
The invention relates to a preparation method for a hierarchical hollow cubic stannic oxide nanometer particle composed of ultrafine nano-rods and belongs to the technical field of nanometer material preparation. The method comprises the following steps: taking solid cubic zinc hydroxystannate as a precursor, covering a layer of stannic oxide nano-rods on the surface of the zinc hydroxystannate after the hydrothermal reaction for a period of time, and meanwhile, decomposing the inner zinc hydroxystannate, thereby acquiring the hierarchical hollow cubic stannic oxide nanometer particle composed of the ultrafine nano-rods in the shape similar to the shape of zinc hydroxystannate. Compared with the traditional template method, the preparation method has the advantages of low cost, few steps and simple operation; the prepared hollow stannic oxide nanometer particle has an obvious hierarchical structure and a mesoporous structure, is difficult to agglomerate, is excellent in crystallinity and is high in specific surface area; the hierarchical hollow cubic stannic oxide nanometer particle is composed of a large quantity of orderly arrayed nano-rods and the size of the nano-rods is close to the debye length; the air-sensitive characteristic is excellent; and the hierarchical hollow cubic stannic oxide nanometer particle has a potential application value in the field of air-sensitive sensors.
Owner:JILIN UNIV

Preparation method of noble metal doped In2O3/SnO3 porous-channel structured gas-sensitive material

The invention relates to a preparation method of a noble metal doped porous-channel structured In2O3 / SnO3 gas-sensitive material, which comprises the following steps of: pressing market In2O3 and SnO2 in the ratio of 4:1 or 7:3 or 3:2 together with noble metal Pt or Pd or Ag powder into a blank in a steel mold; and then, loading the blank into an oxygen atmosphere sintering furnace for solid phase sintering to finally obtain the noble metal doped porous-channel structured In2O3 / SnO3 gas-sensitive material. The addition quantity of the noble metal Pt or Pd or Ag powder accounts for 0.05% of the total quantity of In2O3 and SnO2; with respect to the oxygen atmosphere sintering condition for the in-situ sintering growth, the heating rate is 50-500 DEG C / h; a heat preservation process is divided into two stages, the temperature range of the first stage is 600-700 DEG C, and the temperature range of the second stage is 1250-1450 DEG C; the time of heat preservation is 1-5h; and the oxygen flow is 3-8 L / min. The method can increase gas sensitivity by increasing the specific surface area through the porous-channel structure and increases the selectivity of the gas-sensitive material through the nanometer noble metal. The invention has the advantages of low cost, clean production and the like and is easy to control, and the raw materials are simple to prepare.
Owner:KUNMING UNIV OF SCI & TECH
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