69results about How to "Help with transmission" patented technology

The invention discloses a flexible low-voltage organic field effect transistor and a manufacturing method thereof. Three layers of polymers are added between a gate and a semiconductor layer interface to serve as an insulated layer; the overall device comprises a source and drain electrode, a semiconductor, a high-insulation polymer, a high-dielectric constant material polymer, a high-insulation polymer, a gate, and a flexible transparent plastic substrate sequentially from top to bottom; and the dielectric layer with the structure has excellent insulation and good stability. Through measuring electrical properties and a semiconductor particle growth shape, whether the device is a flexible low-voltage organic field effect transistor can be judged. The organic field effect transistor has the advantages of realizing high mobility and large switch ratio under low voltage, maintaining good performance when bias voltage is applied and in a high temperature condition, and having good stability features in different bending modes.

The invention relates to a composite micro-nano hollow fiber material as well as a preparation method and an application thereof. The composite micro-nano hollow fiber material is a carbon nanofiber internally wrapped with a metal simple substance, or an alloy or a metal compound porous hollow nano-prism, wherein the metal compound is at least one of a metal sulfide, a metal phosphide and a metalselenide; the metal compound comprises at least one metal element of iron, nickel and cobalt; and the alloy comprises at least two metal elements of iron, nickel and cobalt. When the composite micro-nano fiber is used as a lithium metal negative electrode carrier, the multi-stage hollow structure provided in the composite micro-nano fiber is beneficial to permeation and diffusion of an electrolytein the fiber, and space is better provided for deposition of lithium inside the fiber. In addition, the metal sulfide, metal phosphide, metal selenide, or metal elementary substance or alloy in the carrier has relatively high lithium affiliated properties, and the deposition of the metal lithium inside the carbon fiber is facilitated.

The invention relates to a cathode material of a lithium battery and a preparation method thereof. A Ni-ZIF-67@CC / CNTS nanometer composite material is prepared by carrying out a chemical vapor deposition on a long carbon nanotube on cloth C. The Ni-ZIF-67@CC / CNTS nanometer composite material prepared by using a chemical vapor deposition method has a fuzzy porous structure, is used for lithium battery cathodes and is conducive to lithium ion transporting; moreover, the porous structure is more easier to carry sulfur; the electrochemical performance of the cathode material of the lithium batteryis obviously improved; the fade of discharge capacity in the circulation process is very small; the battery capacity and the circulation stability of a lithium ion battery are effectively improved; polysulfide is very well adsorbed; and the shuttle effect of the polysulfide is suppressed.

The invention discloses a large-mode-field fiber pumped coupler and a manufacturing method thereof. The coupler comprises a main fiber and a pumped fiber bundle containing a plurality of pumped fibers, wherein the hollow fiber bundle is defined by a plurality of pumped fibers; one end of the main fiber is provided with a transition zone which exposes an inner cladding and is inserted into a hollow part of the pumped fiber bundle; the corresponding part of the pumped fibers and the transition zone of the main fiber is a tapering end which exposes a cladding; and the cladding of the tapering end of the pumped fibers is in close contact with and integrally fused with the inner cladding of the transition zone of the main fiber. The manufacturing method comprises the following steps of: preprocessing a plurality of pumped fibers to form the hollow fiber bundle, and cutting at an appropriate position; reducing or not reducing the diameter of the inner cladding of the main fiber; inserting the preprocessed main fiber into the hollow pumped fiber bundle to ensure that the main fiber is in close fit with the fiber bundle; and integrally fusing the main fiber with the fiber bundle, and recoating the main fiber. On the premise of not damaging a fiber core structure of the large-mode-field main fiber, signal coupling efficiency is improved.

The invention relates to a method and equipment for realizing remote education by utilizing AR. A pair of AR glasses is connected with a remote terminal control system through a wireless communication module in a remote signal manner, so that images which can be seen by a teacher on the AR glasses can be transmitted to the remote terminal control system positioned out of a teaching site in real time, and students can see teaching contents, which can be seen by the teacher, personally at home. Compared with the existing remote education manner, the method has better reality, so that students can have better sense of substitution in learning and attention can be better improved; and furthermore, the teacher can conduct dynamic interaction with students on the AR glasses and can easily mark key points for students without the need of smearing and drawing on the true teaching contents, the operation is simple, the observation feeling is not influenced, and the teacher can clearly find the question where the students point out and can make pointed reference for the position, so that the teaching effect can be greatly enhanced.

The invention relates to a polyacrylonitrile fiber pre-oxidation method, a polyacrylonitrile carbon fiber and a preparation method thereof. According to the main technical scheme herein, the polyacrylonitrile fiber pre-oxidation method comprises the steps of pre-oxidizing a polyacrylonitrile fiber in an pre-oxidation apparatus to obtain pre-oxidized fibers, wherein a pressure difference between first and second positions in the pre-oxidation apparatus is 5-15 Pa during pre-oxidation, and wherein the first position is close to the inner top of the pre-oxidation apparatus, and the second position is close to the inner bottom of the pre-oxidation apparatus. The polyacrylonitrile fiber pre-oxidation method is applied mainly to: effectively improving homogeneity of the pre-oxidized fibers in order to prepare the polyacrylonitrile carbon fiber having low coefficient of dispersion; providing quick pre-oxidation, reduced energy consumption and reduced production cost in order to achieve industrial production of the polyacrylonitrile carbon fiber.

The invention provides a composite photocatalyst for photolyzing water and degrading pollutants and a preparation method thereof. The composite photocatalyst can realize efficient transformation fromsolar energy to chemical energy, and is mainly prepared by compounding a mesoporous template and photocatalytic active components in the aspect of a nano-scale; the photocatalytic active components are nanoparticles of compound metal salt; the compounding is realized by uniformly dispersing the photocatalytic active components in a pore channel framework of the mesoporous template; the compoundingis realized through the following steps: complexing a soluble metal salt precursor and a complexing agent and dispersing into a pore channel of the mesoporous template; then carrying out high-temperature calcination under a limited area environment. The catalyst provided by the invention is mainly used for photocatalytically decomposing water to produce hydrogen or photocatalytically degrading organic pollutants including VOC (Volatile Organic Compound), s-VOC (semi-Volatile Organic Compound) and the like in the water or air under sunlight. The catalyst provided by the invention has good stability and good dispersity; platinum or other co-catalysts are loaded, so that the composite photocatalyst has very high activity on photocatalytic complete decomposition on the water and photocatalytic degradation on organic matters.

The invention discloses a preparation method of a heterojunction CoO / CoS porous nanorod, an obtained material and application of the heterojunction CoO / CoS porous nanorod. The method comprises steps: synthesizing cobalt-citrulline nanorods by taking a cobalt salt as a metal source and L-citrulline as a coordination agent through hydrothermal reaction; calcining and oxidizing the nanorods; and finally, vulcanizing through a vapor deposition method to obtain the loose and porous heterojunction CoO / CoS porous nanorod with a rough surface. The heterojunction CoO / CoS porous nanorod catalyst prepared by the invention shows relatively high catalytic activity and stability on electrochemical reaction (OER) of oxygen, is a high-stability anode oxygen evolution catalyst which can be well applied to water electrolysis, and has a wide application prospect in the future energy industry.

The invention provides a preparation method of an ORR catalyst. The preparation method of the ORR catalyst comprises the following steps: (1) making a precursor of a cobalt-containing multi-nitrogen metal organic framework material; (2) dispersing the precursor into an ethylene glycol solution containing chloroplatinic acid, and performing microwave synthesis / extraction reaction to prepare a cobalt multi-nitrogen metal organic framework material containing platinum participating in post coordination; and (3) calcining the cobalt multi-nitrogen metal organic framework material containing platinum participating in post coordination to obtain the ORR catalyst. An electrocatalyst is prepared in an oxidation-reduction mode by adopting a Pt-based enhanced multi-nitrogen imidazole carboxylic acidcobalt-based metal organic framework material, and the operation process is simple. Meanwhile, the content of platinum in the catalyst is reduced, the prepared catalyst metal organic framework has amicro-pore structure, proton and gas transmission is facilitated, and the product has relatively high catalytic performance.

An application of a molecular sieve composite porous membrane in a lithium-sulfur battery is disclosed. The molecular sieve composite porous membrane is a composite porous membrane formed by adoptinga porous membrane prepared from one or more than two types of organic polymer resin as a matrix, and by compositing inorganic molecular sieve layers on the two side surfaces of the matrix. The molecular sieve composite porous membrane has high electrolyte absorbing capability and storage capability in the lithium-sulfur battery, and facilitates lithium ion transfer. The pore diameter of molecularsieve layers of the composite membrane can be controlled to be a size between a polysulfide size and a lithium ion size, and therefore the shuttle effect of polysulfide is effectively inhibited underthe premise of not influencing lithium ion conductivity, loss of active compounds is reduced, and the battery efficiency and stability are improved. In addition, the molecular sieve layers of the composite membrane have good thermal conductance, can inhibit generation of negative electrode lithium sheet dendritic crystals, and prevent battery short circuits because a separating membrane is piercedby the dendritic crystals in a battery using process.

The invention discloses a sensitization dye for sensitization nanocrystalline solar cell, with better adsorption above 500nm, a preparation method of center decorated porphyrin which median phenyl is provided with carboxyl or ester substitution and beta position is provided with phenanthrene ring conjugation and an application, wherein the Soret band has 507nm, the porphyrin is provided with carboxyl, therefore, the compound can be combined firmly with semi-conductive material as nanometer TiO2 to produce solar cell, with improved solar light adsorption. Test proves that the photoelectric conversion efficiency of dye sensitization solar cell can reach 0.32%.

The invention discloses a preparation device and method for a metal lithium composite negative electrode. The device comprises a heating container, a roller machine and a nitrogen reaction container,wherein a graphite electrode is arranged inside the heating container, the graphite electrode and the heating container are correspondingly connected with an external power supply through wires, the heating container is connected with the roller machine through a pipeline, and the nitrogen reaction container is arranged at the tail end of the roller machine. Cycling performance of a composite metal lithium alloy negative electrode material prepared by the preparation device and method is remarkably improved, meanwhile, generation of lithium dendrites is inhibited, and the safety of a battery is greatly improved.

The invention discloses an oxygen reduction catalyst based on nitrogen-doped graphene aerogel and a preparation method therefor. The oxygen reduction catalyst is mainly a graphene aerogel with a gradient pore structure, and the aerogel contains a nitrogen-containing functional group. The preparation method comprises the following steps of adding ammonia water into a graphene hydrogel to freeze dry, so that the graphene aerogel is obtained, and further treating the graphene aerogel with high-temperature ammonia gas, nitrogen element is heavily doped after two steps, so that the nitrogen-doped graphene aerogel is synthesized. The graphene aerogel provided by the preparation method has a developed pore structure and contributes to the transport of reactants such as oxygen, hydrogen ions and water. According to the oxygen reduction catalyst based on nitrogen-doped graphene aerogel and the preparation method therefor, the nitrogen-containing functional group is further introduced into the aerogel by means of a high-temperature ammonia gas treatment, so that conductivity and catalytic activity of the catalyst are improved. Compared with a traditional platinum-based catalyst, the nitrogen-doped graphene aerogel has comparable ORR catalytic performance, the cost is greatly reduced, and good application prospects are achieved.

The invention relates to a molybdenum disulfide / three-dimensional graphene composite material which is prepared by the following method: utilizing graphene oxide and L-cysteine to prepare three-dimensional graphite alkene aerogel, placing four ammonium thiomolybdate and three-dimensional graphite alkene aerogel in a microwave reaction cavity after grinding, heating for 1-20 minutes at the microwave power of 300-1000W to obtain the molybdenum disulfide / three-dimensional graphite alkene composite material. The molybdenum disulfide / three-dimensional graphite alkene composite material is obtainedunder the microwave heating condition, graphene oxide is thermally reduced into graphene, and in the meantime, the single-source precursor is heated and rapidly decomposed to generate MoS2, so that MoS2 directly grows in situ on the surface of the graphene, the microwave heating speed is high, the heating is uniform, the MoS2 nanosheets and the graphene are firmly combined, which is not easy to cause particle accumulation, the time required for synthesizing the material is greatly shortened, and the problem of agglomeration of the graphene and the MoS2 under the long-term heating condition issolved; compared with a two-dimensional structure, the graphene with the three-dimensional structure is not easy to be re-stacked and agglomerated in the compounding process, so that the excellent properties of the graphene are guaranteed; and the composite material mentioned above serving as the cathode material of the lithium ion battery demonstrates good cycling stability and rate capability.

The invention discloses a double-electron-transport-layer flexible perovskite solar cell and a preparation method thereof. A device structure of the double-electron-transport-layer flexible perovskitesolar cell sequentially comprises a flexible conductive substrate / SnO2 / CdS / perovskite absorption layer / hole transport layer / metal electrode from bottom to top. SnO2 and CdS are combined to serve as adouble-electron transmission layer, and the advantages are as follows: (1) CdS and SnO2 are prepared at low temperature and are very suitable for developing flexible photovoltaic devices; (2) the CdSfilm has high electron mobility and is beneficial to charge transmission of the device; and (3) the SnO2 layer is deposited between the flexible substrate and the CdS layer cadmium sulfide, so that the problems of non-uniformity and holes when the CdS layer is directly deposited on the substrate can be improved, the leakage current is reduced, and the electron extraction capability is enhanced.

The invention discloses a nanometer porous zinc electrode for electrochemical reduction of carbon dioxide, and a preparation method and application thereof. The nanometer porous zinc electrode is composed of a substrate layer, a Zn electrodeposited layer on the outer surface of the substrate layer and a Zn catalyst nanolayer formed on the surface of the Zn electrodeposited layer, wherein the Zn catalyst nanolayer of the electrode is composed of Zn nanoparticles with particle sizes of 1 to 300 nm; the Zn catalyst nanolayer of the electrode contains pore channels with diameters of 1 to 300 nm and has porosity of 2 to 15%; the Zn electrodeposited layer has a thickness of 500 nm to 0.05 mm; and the Zn catalyst nanolayer has a thickness of 100 to 500 nm. According to the invention, the Zn nanoparticles with abundant marginal active sites are prepared through electrodeposition on a substrate, heat treatment and electrochemical reduction, so the electrode has substantially improved specific surface area and active area and is enhanced in Faraday efficiency in electrochemical reduction of carbon dioxide into formic acid.

The invention discloses a triphenylamine organic dye and a synthesis method thereof. The chemical structure of the triphenylamine organic dye is as shown in a general formula (1). In the formula (1),R<1> is selected from hydrogen or styryl, R<2> is selected from hydrogen or styryl, and the following structure is a quinoxaline derivative. The triphenylamine organic dye provided by the invention has a long conjugated D-pi-A structure, and meanwhile, molecules contain cyano groups and carboxyl, and the electrondrawing group is cyanoacetic acid. The triphenylamine organic dye can be used as a solar cell sensitizer, and has a good application prospect in dye-sensitized solar cells.

The invention discloses a sulfonyl conjugated microporous polymer, a preparation method and application. The conjugated microporous polymer is formed by coupling aryl dibromide containing sulfonyl and ethynyl compounds through Sonogashira, the material structure contains rich sulfonyl group sites, and alkali metal ions can be effectively replaced and combined through ion exchange. The sulfonyl sites can promote cation migration, and high migration number and stable high conductivity are obtained. The sulfonyl conjugated microporous polymer solid electrolyte has good lithium ion conductivity, the lithium ion conductivity is 1.71*10<-4> S*cm<-1> at 40 DEG C and reaches 2.34*10<-3> S*cm<-1 > at the high temperature of 120 DEG C, and an assembled solid lithium ion battery can stably run at the high temperature.

The invention provides a gel polymer battery. The battery comprises a positive electrode, a negative electrode and a gel polymer electrolyte, the positive electrode is made of a material of which thevoltage is greater than 3.5 V, the negative electrode is metal lithium, the gel polymer electrolyte is of a layered structure and comprises an ether gel polymer electrolyte layer and a carbonic estergel polymer electrolyte layer, the ether gel polymer electrolyte layer is close to one side of the negative electrode, and the carbonic ester polymer electrolyte layer is close to one side of the positive electrode. The gel polymer electrolyte contains ether and carbonate gel electrolytes at the same time, so that the gel polymer electrolyte can be used in a battery system of which the negative electrode is made of metal lithium and the positive electrode is made of a high-voltage material, the energy density of the battery is greatly improved, and the safety performance of the battery is alsogreatly improved due to the use of the gel polymer electrolyte.

The invention relates to an intelligent constant-temperature fresh-keeping control device and a control method. The intelligent constant-temperature fresh-keeping control device comprises a computer and a storage cabinet; a plurality of fresh-keeping cabins are formed in each storage drawer, and the fresh-keeping cabins are provided with infrared emission heads, infrared receiving heads, air outlets and air inlets. The infrared emission heads emit infrared light into the fresh-keeping cabins, the infrared receiving heads receive the infrared light reflected by food stored in the fresh-keepingcabins and transmit the infrared light to an infrared spectrometer through optical fibers, the infrared spectrometer transmits a collected infrared spectrum to the computer, the computer inputs the infrared spectrum into a discrimination model stored in the computer, and the types of the food in the fresh-keeping cabins, the appropriate storage temperature and the maximum fresh-keeping time are judged according to the infrared spectrum; by combining with the analysis function of the infrared spectrum, the types of the food, the real-time temperature, the appropriate storage temperature and theremaining maximum fresh-keeping time are identified simultaneously; and the fresh-keeping cabins are each formed into an ellipsoid shape, circulation of an air circulating system is facilitated, thusthe temperature in the fresh-keeping cabins is uniform, fresh-keeping of the food is facilitated, all the fresh-keeping cabins are operated independently, and using is easy and convenient.

The invention discloses a Si-Sn composite material used for a Li-ion battery anode and a preparation method thereof. The composite anode material is of a Sn-fiber-wound Si particle composite structure and composed of two elements Si and Sn, wherein the Si content is 20-70at.% and the balance is Sn. According to the preparation method of the composite anode material, Si and Sn powder are mixed and the mixed powder is ball milled by using a high-energy ball milling method in an argon atmosphere; under the action of high-energy impact, metal Sn particles deform seriously, are subjected to cold welding and torn to form Sn fibers; through further ball milling, fiber-structured ductile-phase metal Sn formed after high-energy ball milling and Si particles smashed under high-energy impact in the ball milling process are composited to form a Sn-fiber-wound Si particle composite structure. The novel Sn-fiber-wound Si composite material is simple in preparation process and low in cost; in addition, the composite material is novel and unique in structure and excellent in electrochemical performance and therefore has excellent application prospect.

The invention belongs to the technical field of electrocatalysis, and specifically relates to a cobalt-based petal-like composite material loaded by silver nanoparticles and a preparation method and application of the composite material. A catalyst successfully loads the silver nanoparticles onto the surface of a cobalt-based petal-like composite material by a simple hydrothermal reaction and a reduction reaction at room temperature; meanwhile, the structure and morphology of the cobalt-based material are still well maintained after the introduction of silver, and an open petal-like structure provides favorable conditions for material transport and charge transfer. Electrochemical test results show that the catalyst has excellent OER (Oxygen evolution reaction) activity, the overpotential is only 268 mV when the current density is 10 mA / cm<2>, and the catalyst is far superior to a commercial RuO2 catalyst; in addition, the catalyst has good long-term stability. The preparation method provided by the invention does not need precision equipment, is low in energy consumption, wide in source of raw materials, and low in cost, can realize gram-level preparation, and has important practical value.

The invention relates to a lithium supplementing material and a preparation method thereof, a negative electrode and a lithium ion battery, the lithium supplementing material comprises metal lithium particles and a conductive material, the conductive material comprises a built-in section embedded in the metal lithium particles and an exposed section located outside the metal lithium particles; and the electronic conductivity of the conductive material is greater than 100s / cm. The lithium supplementing material disclosed by the invention can realize electron conduction between the lithium metal particles and the negative electrode active material through the conductive material, increases an electron conduction channel, is beneficial to lithium ion transmission, realizes a rapid embedding process of lithium ions, and remarkably improves the lithium supplementing efficiency, so that formation of dead lithium is effectively inhibited, and potential safety hazards caused by the fact that dendritic crystals pierce a diaphragm are avoided.

The invention relates to a weak light image stochastic resonance reconstruction method and device based on cross modulation instability, which solves the technical problems of discrete intensity modulation and image detail loss in the existing single path stochastic resonance reconstruction method. The method and the device combine the scattered image signal beam and the coherence-controllable noise beam to propagate in a nonlinear crystal, and generate mode coupling and phase modulation by adding a coherence-controllable noise beam. The additional noise beam changes the spatial frequency composition of the scattered signal beam and provides enough energy for nonlinear coupling so that the intensity distribution of the reconstructed enhanced weak-light image is uniform and more high-frequency details are presented.

The invention discloses a preparation method and application of a three-dimensional porous carbon material with high specific surface area and adjustable pore size distribution. The preparation methodof the three-dimensional porous carbon material comprises the following steps: (1) preparing a saturated aqueous solution of sodium chloride, then adding saccharides, nitrogen-containing organic matters and nano-calcium carbonate, and fully and uniformly dispersing to obtain a dispersion; (2) carrying out freeze drying on the obtained dispersion; (3) putting the freeze-dried sample into a tubularfurnace, and carrying out two-stage carbonization in a protective atmosphere to obtain a template-containing carbon material 1; (4) removing a template in the carbon material 1 to obtain a carbon material 2; (5) mixing and grinding the carbon material 2 and an activating agent, and roasting the carbon material 2 in a tubular furnace under a protective atmosphere to obtain a carbon material 3; and(6) removing the activating agent in the carbon material 3 to obtain the three-dimensional porous carbon material with high specific surface area. The invention provides application of the prepared three-dimensional porous carbon material as a negative electrode material of a lead-carbon battery, and the three-dimensional porous carbon material shows excellent capacitance performance and cyclingstability.

The invention aims to provide a preparation method of potassium carbonate chemically-activated low-order carbon source-based porous carbon, which has the advantages of developed pores, relatively highgraphitization degree, simple preparation process and obvious graphitization structure, and can be applied to the field of electrochemical energy storage such as electrode materials of electric double-layer supercapacitors. The preparation method of the potassium carbonate chemically-activated low-order carbon source-based porous carbon comprises the following steps: a low-order carbon source isprocessed into powder, and drying is conducted; 2-5 parts by weight of potassium carbonate is dissolved in water, a potassium carbonate solution is obtained, then 1 part by weight of the powdery low-order carbon source obtained in the step A is added into the potassium carbonate solution, and the potassium carbonate solution mixed with the powdery low-order carbon source is placed in a stirrer tobe stirred evenly, and a mixture is obtained. The mixture obtained in the step B is placed in an atmosphere furnace filled with nitrogen or argon, heating is conducted by the atmosphere furnace at a rate of 3-20 DEG C / min, and the atmosphere furnace heats to 900-1300 DEG C.

The invention relates to a heat-conducting electromagnetic-shielding high-strength PEEK composite material which comprises the following components in parts by weight: 50-90 parts of PEEK, 0.5-10 parts of beryllium bronze powder, 2-10 parts of ferrite powder, 0.5-5 parts of semiconductor nano powder and 10-50 parts of PEI-based long carbon fiber. A preparation method comprises the following steps:(1) proportionally mixing the beryllium bronze powder, the ferrite powder and the semiconductor nano powder into mixed powder, adding a coupling agent into the mixed powder, and continuing to uniformly mix to form modified mixed powder for later use; and (2) adding PEEK into a main feeding port of a double-screw extruder, adding the modified mixed powder obtained in the step (1) into a side feeding port, adding the PEI-based long carbon fibers into an exhaust port, and performing extrusion granulation to obtain the heat-conducting electromagnetic-shielding high-strength PEEK composite material. The PEEK composite material disclosed by the invention has relatively good heat conduction and electromagnetic shielding properties and relatively high mechanical strength.

The invention relates to a preparation method and application of a rare earth cerium doped nickel sulfide / iron sulfide heterojunction material. The method comprises the following steps: (1) selecting a three-electrode system, taking foamed nickel as a working electrode, taking a graphite rod as a counter electrode, taking Ag / AgCl (a saturated KCl solution) as a reference electrode, taking a mixed solution of nickel nitrate, ferric nitrate and cerous nitrate as an electrolyte, and carrying out constant-current deposition for 600-900s under-15 to-20mA to prepare a Ce-NiFeLDH / NF precursor taking the foamed nickel as a carrier; and (2) putting the Ce-NiFeLDH / NF precursor with the foamed nickel as the carrier obtained in the previous step and powdered sulfur into a tubular furnace, heating to 300-400 DEG C, and keeping the temperature for 120-150 minutes to obtain the cerium-doped nickel sulfide / iron sulfide heterostructure. The preparation method is simple, convenient and easy to operate, and more catalytic activity centers and better inherent electrocatalytic activity are obtained through doping of rare earth cerium.