115results about How to "Uniform phase" patented technology

This invention relates to a method for preparing olivine-type phosphate-series lithium ion battery anode material. The method comprises: mixing one or more of ferrous salt solution, cobalt salt solution and manganese salt solution with oxalic acid or oxalate (precipitating agent) aqueous solution to obtain composite oxalate precursor, uniformly mixing with lithium source and phosphorus source by ball milling, and reacting in inert or weak-reductive atmosphere to obtain olivine-type phosphate-series lithium ion battery anode material. The method utilizes co-precipitation method for metal ion doping, and realizes molecular level uniform mixing among different ions. The obtained olivine-type phosphate-series lithium ion battery anode material has uniform chemical and physical compositions. The average particle size can be controlled within 0.3-10 mu.m. The first charge and discharge cycle specific capacity can reach 150 mAh / g at 0.1 C rate and room temperature. The livine-type phosphate-series lithium ion battery anode material has such advantages as high cycle performance and high charge / discharge performance.

The invention relates to a carbon coated lithium iron phosphate microwave-synthesizing method, relating to the preparation of anode material of a Li-ion battery. The invention weighs lithium carbonate, iron oxalate and ammonium diacid phosphate, proper amount of heat conduction agent and organic matter in chemical gauging ratio, using anhydrous alcohol as dispersant to fully grind and mix them, drying and pressing the mixture into blocks, placing the blocks in a pot holding activated carbon, and placing the pot in microwave field for irradiative heating so as to be able to make uniform- phase carbon coated lithium iron phosphate. The invention can realize carbon coating of lithium iron phosphate and more rapidly and uniformly heat the raw materials, beneficial to uniform and rapid reaction of massive raw materials. The method can shorten production cycle and reduce energy consumption.

The invention discloses an ethylene-propylene-diene monomer rubber used for manufacturing a wind energy cable and a preparation method thereof. The ethylene-propylene-diene monomer rubber comprises the following components: 90-110 parts of ethylene-propylene-diene monomer rubber, 1-4 parts of anti-aging agent, 0.2-0.5 part of stearic acid, 2-9 parts of paraffin oil, 2-5 parts of lead sulfate tribasic, 1-4 parts of zinc oxide, 80-120 parts of activated kaolin, 0.3-1.5 parts of coupling agent, 0.5-2.6 parts of cross-linking agent, 0.5-2.0 parts of assistant crosslinker, 1-3 parts of semi-reinforcing carbon black, 1-4 parts of plasticizer, 0.5-2 parts of antimonous oxide, 0.5-2 parts of zinc borate, 1-5 parts of basic magnesium carbonate, 1-4 parts of antioxygen, 0.1-0.5 part of sulphur, 2-5parts of epoxidized soybean oil, 5-15 parts of decabromodiphenyl ether, 12-30 parts of antimony oxide and 2-5 parts of organic modified bentonite. The material has the advantages of wide applicable temperature range, god performance and long service life.

The invention discloses nano indium tin oxide powder, which comprises an indium compound and a tin compound, wherein a mass ratio of indium oxide to tin oxide is 9:1; and the nano indium tin oxide powder is in an irregular elliptical spherical shape. The ITO nano powder obtained by a method for preparing the ITO nano powder is uniform in grain diameters and high in dispersibility, and the grain diameters are about 60 nanometers.

Belonging to the technical field of preparation and application of electronic ceramics, the invention relates to a preparation method of a perovskite-like varistor ceramic material CaCu3Ti4O12 (CCTO) with a high dielectric constant. With nitrates of Cu and Ca as well as Ti (OC4H9)4 as starting materials, the method of the invention combines a hydrothermal method for preparing nanometer CCTO powder so as to prepare high performance CCTO varistor ceramics, thus realizing the purposes of lowering temperature, and improving varistor as well as dielectric properties.

The invention provides a preparation method of a NiCo2S4 nano-material. The preparation method comprises the following steps: firstly, mixing a soluble cobalt source, a soluble nickle source, urine and a solvent to obtain a reaction precursor solution; then placing a conductive substrate in the obtained reaction precursor solution, performing reaction under the microwave action, and then performing heat treatment to obtain a NiCo2O4 nanosheet; and enabling reaction between the obtained NiCo2O4 nanosheet and a sulfide to obtain the NiCo2S4 nano-material. The preparation method is simple in process, low in cost and energy consumption, short in reaction time, and favorable for large-scale industrial expansion; the NiCo2S4 semiconductor nanosheet is uniform in shape and large in specific area; controllable growth of a nano-structure thin film can be realized, so that full contact with an electrolyte is realized; quick ion diffusion and effective charge transmission are guaranteed; the NiCo2S4 nano-materia can be directly used as a counter electrode of a dye-sensitized solar cell and has a huge application prospect.

Methods for generating weights for the antenna elements (110) in an AESA antenna (100). In one embodiment, transmitting weights are selected to have unit amplitude and quadratic phase, and receiving weights are selected to provide a two-way antenna pattern which is uniform over a useful portion (300) of the main lobe, and decreases rapidly outside of the uniform portion. In another embodiment the transmitting weights have unit amplitude over a central portion of the array and the receiving weights are selected to provide a two-way antenna pattern which is uniform over a useful portion (300) of the main lobe.

The invention provides a method for prolonging the service life of a CdS nano photocatalyst. The method is characterized by depositing a layer of 1-10 A as protective layer (TiO2, ZnO, Al2O3, AZO, and the like) on the surface of a CdS nano particle synthesized hydrothermally by virtue of an atomic layer deposition technique. On the premise of guaranteeing relatively a high catalytic efficiency, light corrosion occurrence is effectively reduced, and therefore the service life CdS nano photocatalyst is prolonged from 1 hour to over 18 hour. The preparation method effectively reduces the harm to the light CdS nano particle and prolongs the catalyst life of the CdS nano particle.

The invention provides a water-soluble rare earth doped gadolinium sodium tetrafluoride fluorescent marked nano-crystal and a preparation method thereof, and belongs to the technical field of chemical synthesis of microwave polyalcohol. The rare earth fluorescent nano-crystal is divided into two forms of dual-dope and tri-dope, wherein the dual-dope refers to dope ytterbium and one rare earth selected from erbium, thulium and holmium in gadolinium sodium tetrafluoride, and tri-dope refers to dope ytterbium thulium and holmium in gadolinium sodium tetrafluoride. The preparation method comprises the steps of using ammonium fluoride as a fluorine source, sodium chloride as a sodium source, and rare earth chloride as a rare ion source, using polyethyleneimine as surface modification macromolecules, and reacting in a microwave reactor with polytetrafluoroethylene lining. With the adoption of the method, the reaction efficiency is high, the operation is convenient and fast, the environmental pollution is avoided, the product yield is high, and the process repeatability is high; the gadolinium sodium tetrafluoride nano-crystal substrate with stable thermodynamic property, even material phase, good diffusion, high water-soluble ability, and high fluorescence luminous efficiency is obtained by adjusting the ratio of gadolinium ions and fluorine ions; and the product is suitable for multicolor biomarkers.

The invention discloses a novel planar Magic-T based on a folded substrate integrated waveguide. The folded substrate integrated waveguide is used to realize an H-surface power divider, a T-shaped junction of a conventional trough line excitation substrate integrated waveguide, and the planar Magic-T is realized. The leakage loss is less, the power capacity is higher, and the bandwidth is larger. By means of the open-circuit and short-circuit characteristics of the folded substrate integrated waveguide and the conventional substrate integrated waveguide, a relatively high isolation degree between two input ports is realized, and the unbalance degrees of amplitudes and phases between two output ports are very small, so that the performance of the Magic-T is improved, the design process is simplified, and the Magic-T is easy to apply to a higher frequency band. The overlapping of T-shaped junction of an H-surface and an E surface enables a high integration level of the structure, and the requirements of planarization, miniaturization and high performance in modern radio communication are met.

The invention discloses a Cu2O@Cu / AgBr composite light catalyst and a preparation method thereof. The preparation method of the Cu2O@Cu / AgBr composite light catalyst is characterized by comprising the following steps that 1, firstly, a liquid phase reduction method is adopted for preparing Cu2O@Cu core-shell structure nanoparticles, wherein the mass percentage of Cu in the Cu2O@Cu core-shell structure nanoparticles is 0.5-5%; 2, a liquid-phase precipitation method is adopted for precipitating AgBr on the surfaces of the Cu2O@Cu core-shell structure nanoparticles obtained in the step 1, and the Cu2O@Cu / AgBr composite light catalyst is obtained, wherein the molar ratio of an element Ag to an element Cu is 1: (0.1-20).

The invention relates to a weaving method of a carbon fiber preform of an automobile brake disc, and belongs to the technical field of carbon fiber composite material reinforcement weaving. The methodincludes the following steps: (1) preparing a carbon fiber plain cloth; (2) preparing a carbon fiber net tire; (3) sewing the carbon fiber plain cloth of step (1) and the carbon fiber net tire of step (2) together to form a plain-mesh tire cloth; and (4) winding the plain-mesh tire cloth obtained in the step (3) for a plurality of circles along the circumferential direction of a graphite sleeve,and needling once in each winding circle until the size requirement of the carbon fiber preform is met to form the carbon fiber preform, wherein the weight percentage of the carbon fiber plain cloth in the carbon fiber preform is more than or equal to 67%, and the weight percentage of the carbon fiber net tire is less than or equal to 33%. The preparation method is safer, the fiber waste quantityis less, the thermal conductivity in the thickness direction of the product can be ensured to be higher, the internal phase of the material is more uniform, and the friction surface is smoother and more beautiful.

The invention belongs to the field of conductive materials, and discloses a flexible composite transparent conductive film. A zinc oxide film is arranged on a substrate, and a silver nano wire is arranged on the zinc oxide film. The invention also discloses a method for preparing the transparent conductive film. The method includes steps of performing preprocessing on the substrate, performing spin coating of the zinc oxide film on the substrate, dispensing silver nano wire disperse solution on the zinc oxide film, and performing drying treatment. According to the transparent conductive film, the requirements of low sheet resistance and high light transmittance are met, the light transmittance is 70-95%, and the sheet resistance reaches 15 ohms / square. By employing the preparation method, the source of raw materials is abundant, the operation is simple, the repeatability is good, the dependence on equipment is prevented, vacuum equipment is not needed, high-temperature conditions are not needed, the cost is low, and the time consumption is low.

The invention relates to a solvothermal method for preparing a three-dimensional nanometer layered structure WS2 and an electrochemical application thereof. The method comprises the following steps: adding tungstic acid and S powder into a mixed solution of octylamine and n-hexyl alcohol, and rapidly stirring at room temperature, so that the components are fully mixed; transferring the fully stirred mixed solution into a hydro-thermal synthesis reactor, reacting under the constant temperature of 180-240 DEG C for 24 hours, filtering and collecting the reaction solution after the reaction solution is cooled to room temperature, cleaning by using ethanol and deionized water, drying, and performing heat treatment on the obtained solid products in a nitrogen atmosphere under the condition of 400-750 DEG C for 2 hours, thereby obtaining the three-dimensional nanometer layered structure WS2. The three-dimensional nanometer layered structure WS2 is applied to lithium ion battery and electro-catalysis hydrogen evolution reaction, good electrochemical performance can be obtained under the condition that mixing and coating are absent, and when the current density is 20mA / g, the discharge capacity of the lithium battery is 468mAh / g; and moreover, a hydrogen evolution initial potential more correct than WS2 in the prior art is obtained under the scanning speed of 10mV / s.

The invention belongs to the technical field of composite semiconductor thin films and discloses an indium sulfide (In2S3) / graphene composite film, and a preparation method and application thereof. The In2S3 / graphene composite film is prepared by adding indium chloride, thiourea and polyvinylpyrrolidone to ethylene glycol to form a reaction precursor liquid, and subjecting a FTO conductive glass substrate spin-coated with graphene paste to a microwave hydrothermal reaction in a microwave oven at the power of 700 to 900W and at the temperature of 180 to 220 degrees centigrade. The In2S3 / graphene composite film has a uniform phase, good crystallization and high purity. The method uses a microwave assisted solution for synthesizing the nanometer In2S and graphene composite film, just requiressimple equipment and preparation processes, is low in cost and fast in speed, shortens the reaction time, and uses non-toxic and safe preparation reagents.

The invention discloses a hydraulic thrust sludge high-pressure plunger pump. The hydraulic thrust sludge high-pressure plunger pump comprises a plurality of plunger assemblies and an electric control system used for controlling the multiple plunger assemblies to act independently or act jointly. Each plunger assembly comprises a single pump hydraulic end, a power pump set and an oil tank assembly which are connected through a hydraulic pipeline, wherein the single pump hydraulic end comprises a feeding and discharging unit, a pump body assembly, a main plunger, a main plunger thrust oil cylinder, a secondary plunger thrust oil cylinder and a main control valve set; the sludge feeding and discharging unit comprises a feeding inlet, a sludge inlet assembly, a feeding valve assembly, a discharging outlet and a one-way valve assembly; the secondary plunger thrust oil cylinder is connected with the sludge inlet assembly through the feeding valve assembly; the main plunger thrust oil cylinder is connected with the pump body assembly through the main plunger; the pump body assembly communicates with the feeding inlet through the sludge inlet assembly and communicates with the discharging outlet through the one-way valve assembly; the main control valve set comprises a proportional valve and an electromagnetic reversing valve arranged on an oil inlet and outlet passage of the main plunger thrust oil cylinder and the secondary plunger thrust oil cylinder; and the oil tank assembly is connected with the power pump set.

The invention discloses a method for preparing lithium iron phosphate-doped nano powder for a lithium ion battery. The method comprises the following steps of: synthesizing precursor solution by using phosphorous source compounds, ferrous source compounds and lithium source compounds; preparing source-doped precursor liquid; mixing the source-doped precursor liquid and the precursor solution according to proportion; placing the mixture into a hydro-thermal reaction kettle, reacting at the temperature of between 100 and 220 DEG C under a nitrogen-containing and pressing environment; after the reaction, naturally cooling and taking the mixture out; and performing centrifugal washing on the mixture and drying the mixture to obtain the lithium iron phosphate-doped nano powder. In the method, the lithium iron phosphate-doped nano powder for the lithium ion battery is prepared by a hydrothermal method and by performing a chemical reaction in fluid such as high-temperature and high-pressure aqueous solution or water vapor and the like. Compared with a solid phase method and a sol-gel method, the method has the advantages of simple operation, uniform phase and small grain diameter.

The invention relates to a frequency response balancer by using light carrier Brillouin treatment. An existing phase modulation link can not acquire flat frequency response. In the balancer, a laser device is connected with an input end of a photo-coupler; an output end of the photo-coupler is optically connected with one end of a first polarization controller (PC); the other end of the first PC is optically connected with an optical input end of an electro-optical phase modulator; an output end of the electro-optical phase modulator is optically connected with one end of a single mode fiber (SMF); the other end of the SMF is optically connected with an interface 2 of a circulator; the other output end of the photo-coupler is optically connected with one end of a second PC; the other end of the second PC is optically connected with an optical input end of a modulator; an output end of the modulator is optically connected with an input end of an optical parametric erbium amplifier; an output end of the optical parametric erbium amplifier is optically connected with an interface 1 of the circulator; and an interface 3 of the circulator is optically connected with an input end of an optical high-speed detector. The frequency response balancer is used to realize effective transformation from the phase to the strength, and acquire the adjustable frequency response balance of bandwidth.

The invention provides chromium oxide and a preparation method thereof. The method includes adding a hexavalent chromium salt solution into a reaction device, injecting a protective gas, sealing the reaction device, increasing the temperature, and after a target temperature is reached, injecting a reducing gas continuously for reaction to obtain mixed paste; subjecting the obtained mixed paste tosolid-liquid separation to obtain chromium oxyhydroxide powder; calcinating the chromium oxyhydroxide powder to obtain the chromium oxide. The chromium oxide and the preparation method thereof have the advantages that a hydrothermal reduction method is applied to prepare the chromium oxide from hexavalent chromium salt, the controllability of the reaction process is enhanced through regulation ofthe reducing gas and the reaction conditions, and the reduction rate can reach more than 99%; obtained reduction products have uniform phases and narrow particle size distribution; the obtained chromium oxide products have high quality and can reach the standards of pigment-grade chromium oxide; the method has a short process, low energy consumption, a low cost and no pollutant emission, thereby being a clean production process with remarkable economic benefits.

The invention provides chromic oxide and a preparation method thereof. The method comprises the following steps: feeding a hexavalent chromium salt solution containing seed crystal into a reaction device, feeding protective gas, sealing the device and rising the temperature, and continuously feeding reducing gas to perform reaction after target temperature is achieved, so as to obtain mixed slurry; performing solid-liquid separation on the obtained mixed slurry, and performing calcination on obtained hydroxyl chromic oxide powder, so as to obtain chromic oxide. The method has the advantages that hexavalent chromium salt is adopted to prepare chromic oxide through a hydrothermal reduction method, the reduction reaction rate is improved through adding of the seed crystal, and regulation of the reducing gas and reaction conditions, the controllability of a reaction process is enhanced, the percent reduction can reach greater than 99.2 percent, reduction products are uniform in phase, sizedistribution is narrow, and the quality of obtained chromic oxide is high and can reach the standard of pigment grade chromic oxide; the method is short in flow, and low in energy consumption and cost, does not produce pollutant emission, belongs to a clean production technology, and has significant economic benefit.

The invention relates to a hydrothermal synthesis method for a metal organic frame with photocatalytic performance, and belongs to the technical field of preparation of environmental-friendly materials. The hydrothermal synthesis method comprises the following steps: according to the substance ratio of 1:1:4, respectively weighing didpyridine[3,2-a:2',3'-c]henazine-2-dicarboxylic acid, phosphotungstic acid and chromic chloride hexahydrate solids; transferring three solids in the step (A) into a flask, adding deionized water for dissolving, and agitating for ten minutes so as to be fully mixed; transferring the mixture in the step (B) into a reaction kettle for performing hydrothermal reaction; after the hydrothermal reaction is completed, naturally cooling to room temperature, washing with deionized water, and drying to obtain organic columnar crystals, namely photocatalyst [Co2(HDPPZC)4(Cl)2(H2O)2](PW<12>O<40>).7H2O. According to the hydrothermal synthesis method, a well crystallized product can be directly obtained by adopting intermediate-temperature liquid phase control, high-temperature calcination and crystallization are not required, and the energy consumption is relatively low.

In an energy recovery type surface acoustic wave motor, an increase in energy efficiency at the time of energy recovery and supply is achieved by adjusting phase change. A surface acoustic wave motor comprises: a surface acoustic wave substrate; a slider provided with an applied pressure; a driving interdigital electrode connected to an external power supply for generating a driving surface acoustic wave on a surface so as to drive the slider by a frictional force which is generated on a contact surface of the slider with the surface acoustic wave substrate based on the surface acoustic wave and the applied pressure; recovery interdigital electrodes placed forward and backward in the direction of travel of the surface acoustic wave for recovering energy of a surface acoustic wave unused to drive the slider, and for using that energy to generate a surface acoustic wave; and phase adjusting means for matching the phase of a surface acoustic wave generated by the recovery interdigital electrodes to the phase of the driving surface acoustic wave generated by the driving interdigital electrode.

The invention provides a preparation method and system of lithium iron phosphate. The preparation system comprises a ball mill, a cyclone preheating device used for preheating a material through the afterheat of the system, a ball mill rotary kiln used for milling the preheated material in grades and dynamically sintering at the same time, and a cooler. The method comprises the following steps of: mixing ferric salt, lithium salt and phosphate in molar ratio of Fe: Li: P of (0.8-1.2): (0.8-1.2): 1; adding a solvent which is 2 to 5 times the total weight of the mixture; performing ball milling for 2 to 20 hours through the ball mill; dispersing to feed into the cyclone preheating device for preheating and predecomposition; transferring into the ball mill rotary kiln for sintering and milling in grades at the same time; and discharging and feeding the product meeting the particle size requirement into the cooler for cooling to reach the room temperature so as to obtain the finished lithium iron phosphate. The preparation method is a continuous full-dynamic sintering method, and the product prepared by such method is less in agglomeration, small in particle size, high in uniformity and relatively high in quality and stability of batches.

The invention belongs to the field of two-dimensional composite materials, and particularly relates to a graphene / molybdenum disulfide composite material and a liquid phase preparation method thereof.The structure of the composite material is a graphene microchip with the surface coated with molybdenum disulfide nanosheets. The specific preparation method comprises the following steps: firstly, dissolving ammonium tetrathiomolybdate and graphene powder into deionized water; transferring the mixed solution into a reaction container, and carrying out a hydrothermal reaction at high temperature;and finally, centrifuging and washing to obtain a reaction product. The band gap width of the molybdenum disulfide is regulated and controlled by changing the layer number of the molybdenum disulfide; so that light with different wavelengths can be absorbed, the spectral response range of a photoelectric device manufactured based on the composite material can be greatly expanded, and meanwhile, the sensitivity of the photoelectric device manufactured based on the composite material can be greatly expanded by utilizing the property of high carrier mobility of graphene.

The invention discloses an array antenna monitoring antenna. The array is an axial wide-beam antenna, and comprises a monopole radiator, which is a metal cylinder; a radiator protection medium sleeve, which is wrapped outside the monopole radiator and is equal in length with the monopole radiator; a medium support column body, which is used for supporting the monopole radiator and used for enhancing overall structural strength of the antenna to ensure that the monopole radiator does not deform; a coaxial feed device, the top portion of which extends out of an inner conductor, the inner conductor being externally sleeved by the medium support column body to form an impedance transition section, and the monopole radiator being same with the inner conductor in diameter; and a fixation base, which is used for fixing the whole antenna, the connection body of the coaxial feed device and the medium support column body being inserted and embedded into the fixation base, and the coaxial feed device playing a function of earth in the circuit. The advantages are that plane of the antenna array plane has a horizontal and omnidirectional radiation directional diagram; and such antenna is simple in structure, small in size, low in cost and high in reliability.

The invention discloses a super-soft X / gamma ray protective material which is characterized by comprising the following components: 5-97 wt % of a crystallized X / gamma ray absorption functional body,2.8-93 wt % of a matrix component and 0.2-2 wt % of an assistant; the crystallized X / gamma ray absorption functional body is a crystallization compound with a median particle size D50 of more than 10microns. The anti-radiation product disclosed by the invention has the advantages of multiple breakthrough in flexibility, hardness, bending rigidity, tensile strength and tearing strength, so that not only can the protection performance of X / gamma rays be met, but also the performance requirements of radiation protection materials can be met, the radiation absorption function body is subjected tocontrollable production, and the product protects the human body from being irradiated by the X / gamma rays, the working life is convenient to implement, the production is easy, the product is environment-friendly, and the social significance is not measurable.

The invention discloses a preparation method of a zinc oxide compound lithium iron phosphate positive electrode material. The preparation method comprises the following steps: (1) adding ferrous nitrate and lithium nitrate into a (NH4)2HPO4-NH4H2PO4 acidic buffering solution; stirring for 10 to 30min under a heating condition to obtain a mixed solution; (2) under a stirring condition, adding ammonia water into the mixed solution and adjusting the pH (Potential of Hydrogen) value of the mixed solution to be alkaline; then adding a proper amount of a zinc salt solution drop by drop and stirring;after finishing precipitation, stopping reaction to obtain a mixture of sediment and the solution; (3) carrying out vacuum filtering on the mixture of the sediment and the solution; drying in vacuumfor 10 to 15h under the condition that the temperature is 75 to 80 DEG C; grinding the mixture into powder; pre-firing the obtained powder in an inert atmosphere under the condition that the temperature is 300 to 400 DEG C; then calcining for 8 to 12h under the condition that the temperature is 600 to 800 DEG C; grinding to obtain the zinc oxide compound lithium iron phosphate positive electrode material The preparation method disclosed by the invention is simple and the phase is uniform, the prepared zinc oxide compound lithium iron phosphate positive electrode material has the advantages ofsmall and uniform particle size.

The invention discloses a manufacturing method of a copper zinc tin sulfur selenium semiconductor film and an application. A solvent thermal synthesis technology is adopted to directly manufacture a Cu2ZnSn(Sx, Se1-x)4 semiconductor films on an FTO glass substrate, and the method can be applied to an absorbed layer of a thin film solar cell and a counter electrode of a dye-sensitized cell. In theinvention, through adding different proportions of thiourea and selenourea in a reaction precursor solution, adjusting and control of a two-element proportion of sulfur and selenium in a CZTSSe film are realized so as to realize optical band gap adjusting of the film and make an optical band gap be close to an optimum band gap needed by a solar cell. Required equipment and a manufacturing technology are simple, cost is low, and a product with an uniform phase, a good crystal and a high purity can be directly acquired.

The invention discloses a preparation method of a MoS2 / MoSe2 heterojunction thin film, and relates to the field of semiconductor thin film preparation technologies and new energy development. The preparation method comprises the following steps: (1) preparing a reaction precursor solution, namely adding a reducing reagent into a solvent, and stirring till that the reducing reagent is dissolved; after dissolving, sequentially adding a sulfur source, a molybdenum source and a selenium source, stirring until dissolving, and uniformly mixing to obtain a reaction precursor solution; (2) carrying out early-stage surface treatment on the substrate, namely cutting the substrate, carrying out ultrasonic cleaning after cutting, soaking and cleaning, and carrying out drying treatment after cleaning; (3) carrying out solvothermal reaction: enabling the substrate subjected to early-stage surface treatment in the step (2) to be in contact with the reaction precursor solution obtained in the step (1), and carrying out solvothermal reaction to obtain a substrate deposited with a MoS2 / MoSe2 heterojunction thin film; and (4) cleaning the substrate deposited with the MoS2 / MoSe2 heterojunction thin film obtained in the step (3), and carrying out vacuum drying to obtain the MoS2 / MoSe2 heterojunction thin film.