5436results about "Nanotechnology" patented technology

The invention discloses a method for preparing a single-layer tungsten diselenide nanoband based on a space confinement strategy. By changing the flow and the growth time of hydrogen, effective control on the width and the thickness of a nanoband can be realized. The method comprises the following steps: uniformly spraying tungsten trioxide powder to one substrate, then covering the substrate by the other substrate, and forming micro reaction space which is of a 'sandwich'-like structure. Growth of a tungsten diselenide nanoband is carried out by utilizing a constant-pressure chemical vapor deposition method; physicochemical characteristics of a one-dimensional transition metal chalcogenide strongly depend on suspension key types on the edge of the one-dimensional transition metal chalcogenide, metallic properties are displayed by an ultranarrow band, and conversion from the metallic properties to semiconductor properties can be displayed from the edge to the center of a wider band; the tungsten diselenide nanoband is widely applied to micro-nano photoelectric devices due to the special property; industrial production of the tungsten diselenide nanoband can be realized through an experimental method of the invention.

The invention discloses an ARVR resin wafer process which comprises the following steps: preparing a to-be-detected resin wafer and a reference test piece, and carrying out positioning marking on a micro-nano structure area of the to-be-detected resin wafer to obtain a detection sample; performing multi-dimensional spectrum characterization on the detection sample and the reference test piece, determining a material non-uniform distribution area of the detection sample through comparative analysis, and obtaining molecular structure characterization data; carrying out stress field detection and dynamic response analysis on the material non-uniform distribution area to obtain mechanical property characterization data and high-risk defect points; carrying out microstructure and morphology analysis on the high-risk defect points to obtain defect feature data; and performing system evaluation according to the molecular structure characterization data, the mechanical property characterization data and the defect characteristic data to obtain a health degree evaluation result of the resin wafer. According to the technical scheme, multi-scale characteristic characterization can be carried out on the micro-nano structure area in the resin wafer for AR / VR, and systematic detection of the characteristics such as the molecular state, the interface stress and the phase change of the material is achieved.

Transistor devices are provided. A transistor device includes a substrate. The transistor device includes a lower transistor having a lower gate and a lower channel region on the substrate. The transistor device includes an upper transistor having an upper gate and an upper channel region. The lower transistor is between the upper transistor and the substrate. The transistor device includes an isolation region that separates the lower channel region of the lower transistor from the upper channel region of the upper transistor. Moreover, the lower gate of the lower transistor contacts the upper gate of the upper transistor. Related methods of forming a transistor device are also provided.

The invention discloses a method for preparing nano cerium oxide through supergravity reinforcement, which comprises the following steps: 1) completely dissolving cerium chloride hexahydrate serving as a cerium source with deionized water to prepare a cerium chloride solution; (2) inputting the cerium chloride solution into a supergravity reactor through a peristaltic pump at normal temperature, then inputting ammonia water into the supergravity reactor through a constant-flux pump, and carrying out premixing reaction in the supergravity reactor to form mixed slurry; and 3) after the premixing reaction is finished, taking out the mixed slurry, and carrying out suction filtration, washing, drying and high-temperature oxidation calcination to obtain the nano cerium oxide. According to the method, the production efficiency can be improved, the particle size of the prepared nano cerium oxide is small, the particle size distribution is narrowed, and the crystallinity of crystals is improved.

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention relates to the technical field of wave-absorbing materials. Specifically, the invention relates to a ferrite composite multi-walled carbon nanotube wave-absorbing material and a preparation method thereof. The invention also relates to electronic equipment containing the ferrite composite multi-walled carbon nanotube wave-absorbing material. The ferrite composite multi-walled carbon nanotube wave-absorbing material prepared by the invention comprises a ferrite magnetic material with magnetic loss and a multi-walled carbon nanotube material with electrical loss, and the composite material introduces multiple electromagnetic energy loss modes through unique structural design and component synergy, so that the wave-absorbing performance of the material is enhanced. In addition, the preparation method disclosed by the invention is simple in process, low in requirement on equipment, green and environment-friendly, and free from any toxic and harmful by-products.

The invention discloses a nano-copper modified reduced graphene oxide powder preparation method, which comprises: S1, uniformly mixing a reduced graphene oxide dispersion liquid and a copper chloride solution to obtain a mixed liquid A; s2, reducing the mixed solution A by adopting a reducing agent to obtain a mixed solution B; s3, adjusting the pH value of the mixed solution B to 8-9 to obtain a mixed solution C; s4, titrating the mixed solution C with an alkaline solution until the mixed solution C is red, and standing and filtering to obtain a precipitate D; s5, washing the precipitate D until the pH value of supernatant liquid is neutral, and drying to obtain a precipitate E; and S6, sintering the precipitate E in an inert atmosphere to obtain the nano-copper modified reduced graphene oxide powder. The invention further discloses the nano-copper modified reduced graphene oxide powder, the high-strength and high-conductivity graphene copper plating-aluminum matrix composite and a preparation method of the high-strength and high-conductivity graphene copper plating-aluminum matrix composite.

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and particularly relates to an Ag-MoO2 composite SERS substrate as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing Ag nanoparticles which are uniformly distributed and have the same size by a sodium citrate reduction method; secondly, a MoO2 material is prepared through a hydrothermal method; and finally, the novel SERS substrate Ag-MoO2 is prepared through a physical stirring method. According to the invention, the novel SERS substrate made of Ag nanoparticles and MoO2 materials is constructed, which is different from the conventional SERS substrate made of independent Ag nanoparticles, and can detect stronger intrinsic Raman signals of probe molecules. As the SERS substrate needs to be compounded with a MoO2 material during preparation, a charge transfer phenomenon can occur at an interface where the SERS substrate is in contact with probe molecules, so that intrinsic Raman signals of the probe molecules can be enhanced, and the SERS substrate can be better used for detecting and analyzing chemical substances.

Provided in the present application are a biomass-based hard carbon material, and a preparation method therefor and the use thereof. The preparation method comprises: sequentially performing anaerobic baking, impurity removal, oxidative modification and high-temperature carbonization on a biomass raw material to obtain a biomass-based hard carbon material. In the present application, by means of first sequentially performing anaerobic baking and impurity removal, lignin, cellulose, etc., in the biomass raw material are destroyed, and pores and defects are left inside the biomass raw material, such that the material is in a metastable-state structure to expose impurities; thus, impurity removal can be selected at a normal temperature, and an impurity removal effect is good; and the impurity content of the obtained biomass-based hard carbon is low, the ash content thereof can be reduced to 0.5 wt% or below, and the obtained biomass-based hard carbon has a disordered interlayer structure, thereby facilitating the intercalation / deintercalation of sodium ions, such that the material can show relatively high reversible capacity and initial efficiency performance.

The invention relates to the technical field of temperature control, in particular to a nanocrystalline glass annealing treatment temperature dynamic monitoring control method and system, and the method specifically comprises the steps: capturing an unsteady thermal radiation signal in a glass internal microcrystalline phase change process in real time, and synchronously obtaining three-dimensional residual stress distribution data; dividing the annealing process into gradient crystallization control units according to the time-temperature transition characteristic of the glass; constructing a crystal phase evolution model, and dynamically analyzing the coupling relationship between the microcrystal nucleation rate and the residual stress of each gradient crystallization control unit; and a multi-target particle swarm optimization algorithm is adopted, and temperature field gradient distribution is corrected in real time in combination with grain boundary migration kinetic parameters. According to the invention, the problem of residual stress accumulation and grain size mismatch in a nanocrystalline glass annealing process in the prior art is solved.

The invention relates to a modified current collector for a cathode-free metal battery and a preparation method and application thereof.The preparation method comprises the steps that an in-situ modification reaction is conducted on the surface of a copper current collector to obtain a current collector coated with a copper oxide nanometer material, and then selenium is introduced to the surface of the current collector coated with the copper oxide nanometer material through a partial in-situ substitution reaction to obtain the modified current collector coated with the copper oxide nanometer material. The preparation method comprises the following steps: preparing a copper selenide and copper oxide composite modified current collector, performing in-situ lithiation reaction through electrochemical deposition, and partially converting to generate corresponding lithiates, thereby obtaining the modified current collector for the non-anode metal battery. According to the invention, the functional artificial interface layer with lithium affinity, high stability and high ionic conductivity is constructed on the surface of the copper-based current collector in situ, so that the key problems of uneven metal deposition and unstable SEI layer on the surface of the negative electrode current collector in the current research of the metal secondary battery without the negative electrode are solved, the formation of dendritic crystals and the occurrence of side reactions are inhibited, and the service life of the metal secondary battery is prolonged. Therefore, the coulombic efficiency, the safety and the cycle life of the battery are improved.

The invention provides a method for preparing aerogel by using high-carbon components in coal gas fine slag, which is characterized in that the high-carbon components with ash content lower than 30% in the coal gas fine slag are separated into light carbon and heavy carbon through an isodensity gradient centrifugation or ultrasonic separation technology. The light carbon is subjected to acid leaching impurity removal to obtain a carbon precursor, and then carbon aerogel is synthesized through a chemical activation method; the preparation method comprises the following steps: carrying out oxidation stripping on heavy carbon by using strong acid to obtain graphene oxide, then carrying out alkali activation for reduction, and finally carrying out acid pickling to obtain the graphene aerogel. The composition structural characteristics of the coal gasification fine slag residual carbon are fully utilized, and the preparation of the high-performance aerogel is realized through refined separation and treatment. According to the method, the resource utilization rate of the coal gasification fine slag can be increased, and a new path is provided for preparation of a high-added-value carbon material.

The invention provides a micro-nano impact press-in tester operation monitoring system based on digital twinning, and is suitable for the field of precise instrument maintenance. The system realizes multi-physical field coupling modeling in a micro-nano press-in test through a digital twinning technology, and can monitor the state of an instrument in real time with high precision, predict faults and perform dynamic optimization. The system is integrated with a high-precision sensor, data such as micro force, extremely high temperature and nanoscale displacement are collected in real time, a digital twin model is constructed, and the operation state of an instrument is mapped. Historical and real-time data are analyzed by means of a machine learning algorithm, potential faults can be accurately predicted, maintenance suggestions can be provided, and the precision retentivity and the test stability of the instrument under the material service working condition are ensured. The interaction center provides a visual interface, supports real-time monitoring, dynamic adjustment and early warning functions, and remarkably improves the intelligent maintenance level of the instrument. The invention is suitable for the fields of material science, micro-nano mechanical test and the like, and provides an innovative precise instrument intelligent management scheme.

The invention belongs to the technical field of conductive carbon paste, and discloses a method for efficiently preparing single-walled carbon nanotube paste, which comprises the following steps of: 1, mixing single-walled carbon nanotube powder with a dispersing agent and a solvent, and dispersing the mixture into uniform carbon nanotube bundle paste in manners of mechanical stirring, emulsifying and the like; and step 2, enabling the uniform carbon nanotube bundle slurry to pass through different micropore channels for multiple times in a high-pressure environment, so that the carbon nanotube bundle slurry is dispersed into uniform single carbon nanotube slurry. Through a special high-pressure homogenizing channel, the adhered and wound single-walled carbon nanotube bundles can be dispersed into the slurry of the single single-walled carbon nanotubes on the premise of ensuring the lengths of the single-walled carbon nanotubes as much as possible. The uniform dispersion is realized, the tube diameter of the single-walled carbon nanotubes is relatively long, and the excellent conductivity of the slurry is ensured by the single single-walled carbon nanotubes and the microcosmic number of the single single-walled carbon nanotubes.

The invention provides a synthesis method of nanoscale lithium sulfide, and relates to the technical field of lithium sulfide synthesis. The synthesis method provided by the invention comprises the following steps: stirring and dissolving a lithium sulfide raw material in an alcohol solvent, and separating to obtain a lithium sulfide alcohol solution; evaporating, crystallizing and drying the lithium sulfide alcohol solution to obtain lithium sulfide crystals; and mixing the lithium sulfide crystals with a sulfur source, and firing at 550-850 DEG C to obtain the nanoscale lithium sulfide. The nanoscale lithium sulfide is directly synthesized in one step through a solid-phase sintering method, the operation method is simple, the cost is low, and large-scale industrial production can be achieved.

The invention discloses a multi-layer plating process for optimizing surface characteristics of a base material, which is characterized by comprising the following steps of: pretreating the surface of a plated base material, improving the surface smoothness of the base material, and removing dirt on the surface of the base material; electroplating the base material by using the nickel pre-plating solution; chemical plating: the base material subjected to pre-plating treatment is placed in a chemical composite plating solution for chemical plating; the chemical composite plating solution comprises a basic plating solution and second-phase particles, the second-phase particles are nano niobium carbide, and the second-phase particles are wrapped and embedded into an alloy plating layer in the chemical plating process, so that the second-phase particles are distributed in plating layer matrix metal in a discrete mode to form a discontinuous phase. The hard particles niobium carbide are added and are dispersed and distributed in a coating substrate (Ni-P alloy), the hard particles can effectively refine the substrate metal, so that the hardness of the substrate metal is improved, and the niobium carbide hard phase particles are high in hardness, excellent in wear resistance, large in yield limit and high in pressure resistance.

The invention discloses a preparation method of a Co / Cu nano-alloy catalyst for reducing ammonia through electro-catalysis of nitrate, and belongs to the technical field of electro-catalysts and preparation thereof. The invention solves the problems of low Faraday efficiency and low yield in the process of converting nitrate into ammonia through electro-catalysis in the prior art. According to the invention, Cu and Co are compounded to prepare the catalyst of nitrate reduced ammonia with a nanoneedle structure, and the catalyst shows excellent Faraday efficiency and yield in nitrate reduced ammonia. A test result shows that the ammonia yield of the prepared Co / Cu nano-alloy catalyst reaches up to 16762.68 ugh <-1 > cm <-2 > and the Faraday efficiency is kept above 90% when the Co / Cu nano-alloy catalyst is in a mixed solution of 0.1 mol / L KNO3 and 1 mol / L KOH and the RHE is-0.5 Vvs.RHE. In addition, when the catalyst is at-0.4 V vs.RHE, the ammonia yield and the Faraday efficiency are kept stable during 10 cycles of the reaction.

The invention discloses a preparation method of a silicon-based quantum dot tracer. The silicon-based quantum dot tracer agent disclosed by the invention is prepared by taking 3-aminopropyltrimethoxysilane, sodium citrate, urea and deionized water as raw materials and adopting a hydrothermal synthesis method. The silicon-based quantum dot tracer agent is synthesized by using 3-aminopropyltrimethoxysilane as a silicon source and using the synergistic effect of double reducing agents of sodium citrate and urea, the synthesized silicon-based quantum dot tracer agent can overcome the influence of temperature and environment on the silicon-based quantum dot tracer agent, the fluorescence lifetime is prolonged, and the silicon-based quantum dot tracer agent has a relatively small particle size and can be used for preparing the quantum dot tracer agent. And inter-well tracer testing and single-well chemical testing technology research of an on-site oil field are facilitated.

The invention discloses a preparation method and application of a carbon dioxide gas capture functional molecule modified nanogold catalyst. The preparation method comprises the following steps: synthesizing a modified molecule with a carbon dioxide gas capturing function through a chemical reaction; adding the modified molecules into an organic solvent, and uniformly mixing to obtain a solution; then adding a nanogold colloidal solution into the solution, uniformly stirring, and carrying out oil bath heating reaction; and after the reaction is completed, cooling to room temperature, carrying out suction filtration on the reaction liquid, respectively washing with ethanol and deionized water, and carrying out vacuum drying on the product to obtain the carbon dioxide gas capture functional molecule modified nanogold catalyst. In the electrocatalytic carbon dioxide reduction reaction process of the obtained catalyst, modification molecules are connected with the nanogold catalyst through chemical bonds, active sites of the nanogold catalyst are exposed, and meanwhile, an interface environment beneficial to the carbon dioxide reduction reaction can be provided; therefore, high activity, high selectivity and high stability of the molecular modified nanogold catalyst are realized.

The invention relates to a rotary micro-liquid membrane reactor in-situ detection system for monitoring the nucleation behavior of a nano material. The reactor comprises a rotor and a stator, the base angle of the stator is 70-85 degrees, the rotating speed of the stator is 500-5000 rpm, the width of a slit is 10-500 microns, it is guaranteed that fluid does not backmix when passing through the slit, and a strong shear field is formed. A micro-negative pressure sampler is manufactured to capture nucleation particles in a high-speed shear field to enter a visual observation area, and a high-speed camera and a microscope objective lens are connected in situ, so that an instantaneous image of a nucleation process is obtained in a nano-micro scale, and a transient evolution behavior of a crystal nucleus is captured in situ. The construction of the rotary micro-liquid membrane reactor in-situ detection system solves the problems that the large-scale preparation quality is poor due to the fact that a traditional stirred tank reactor is poor in structure and micro-mixing effect and uncontrollable in material nucleation and growth, and the instantaneous phase transformation and nucleation process cannot be observed due to the fact that the reactor is closed. The obtained hydrotalcite nucleation result enriches the non-classical nucleation theory, and provides guidance for large-scale preparation of nano materials.

The present invention relates to: an electrochemical biosensor capable of effectively and sensitively detecting alfuzosin; an electrode applied thereto; a metal-organic framework (MOF) which includes a zinc / cobalt oxide and is applied in manufacturing the electrode; and methods for manufacturing same.

The invention relates to the technical field of sensors, in particular to a high-sensitivity pressure-temperature dual-mode sensor and a preparation method thereof.The preparation method comprises the steps that a carbon nano tube is subjected to acid treatment and then reacts with a silane coupling agent KH550, and an aminated carbon nano tube is prepared; the method comprises the following steps: carrying out hydrothermal reaction on a phosphorus source and a graphene oxide aqueous solution to prepare phosphorus-doped reduced graphene oxide; the preparation method comprises the following steps: synthesizing Au-Ag heterojunction nano dispersion liquid through an Au nano seed method; mixing the three components and carrying out ultrasonic treatment to obtain mixed dispersion liquid; the preparation method comprises the following steps: modifying a PDMS substrate with KH560 and polyethylene glycol diamine to prepare a modified PDMS substrate; and coating the mixed dispersion liquid on a modified substrate to form a sensitive layer, and preparing an electrode to obtain the sensor. The aminated carbon nanotubes and the phosphorus-doped reduced graphene oxide construct a three-dimensional conductive network, so that high-sensitivity pressure detection is realized; the phosphorus-doped reduced graphene oxide and the Au-Ag heterojunction form a Schottky barrier, so that stable temperature sensing is realized; and the modified PDMS and the sensitive layer are strongly combined to improve the mechanical durability.

The invention discloses a preparation method of a nanoscale lithium aluminum titanium phosphate solid electrolyte, which comprises the following steps: mixing a phosphorus source and a titanium source by using a liquid phase method to react, obtaining a precursor 1 after the reaction is completed under the conditions that the reaction temperature is 25-180 DEG C and the pH value of a reaction system is 0-2, then adding a lithium source and an aluminum source, and preparing a precursor 2 by using a liquid phase reaction, and finally, washing and drying, and carrying out heat treatment to prepare the nano-scale lithium aluminum titanium phosphate solid electrolyte. According to the method, the reaction temperature and the pH value of a reaction system in the process of preparing the precursor 1 are controlled, so that the particle size level of the product is controlled, the introduction of a rear-end crushing process is avoided, the technological process is shortened, and the production period is shortened.

The invention provides a method for preparing a carbon nanotube with assistance of carbon dioxide, which is characterized in that methane is used as a carbon source, carbon dioxide is used as auxiliary gas, and the carbon nanotube is prepared under the action of a catalyst. Carbon deposition generated by using methane as carbon source gas is reduced by using carbon dioxide, and the quality and performance of single-wall, double-wall or three-wall carbon nanotubes are improved, so that application requirements are met.

The invention discloses a carbon dioxide hydrogenation methanation-cracking carbon preparation series method, which comprises the following steps: generating CH4 through a reaction of # imgabs0 # imgabs1 #, and realizing the production of a carbon material by adopting the technologies of condensation separation of CH4 and water vapor, CH4 cracking reaction of # imgabs2 #, cyclic utilization of hydrogen and the like. The process is composed of a carbon dioxide hydrogenation methanation reactor and a methane cracking reactor. In the methanation reactor, CO2 and H2 react under a low-temperature condition to generate CH4 and water vapor; cH4 and water vapor are separated by adopting a compressor condensation separation technology, and the separated CH4 is conveyed to a cracking reactor. In the methane cracking reactor, CH4 is cracked at a high temperature to generate H2 and a carbon nanomaterial, and then H2 is returned to the methanation reactor again. The separation of CH4 and water vapor at a relatively low temperature is realized in the tandem carbonization process through a low-temperature condensation technology; through low-temperature CO2 methanation and CH4 catalytic cracking, the content of CO2 is reduced, a high-quality carbon nanomaterial is obtained, and cyclic utilization of CO2 and H2 is realized.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the sphere-like cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 8-10, and carrying out sol-gel reaction to obtain sphere-like cerium dioxide sol; and (3) carrying out post-treatment on the sphere-like cerium dioxide sol to obtain the sphere-like cerium dioxide. According to the preparation method of the sphere-like cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the sphere-like cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

The invention relates to the technical field of lithium secondary batteries, in particular to a negative electrode for a lithium secondary battery and the lithium secondary battery comprising the negative electrode, and the negative electrode comprises the following technical characteristics: a composite matrix structure: the negative electrode is composed of a multi-layer composite structure, and comprises (a) a conductive support layer, (b) a porous active material layer and (c) a surface functionalized coating. According to the invention, through the high porosity structure of the three-dimensional network metal matrix and the vertical conductive channel of the nanowire array, rapid transmission of lithium ions is realized, the interface resistance is reduced, and the rate capability is improved. And under a 10C high-rate condition, the capacity retention ratio of the negative electrode is still greater than or equal to 80%. The gradient pore structure design further optimizes a lithium ion diffusion path, and the diffusion rate of lithium ions is increased to # imgabs0 # by combining with a Poiseuille flow equation optimization parameter, so that polarization is effectively reduced, and the fast charging capacity of the electrode is improved.

The invention discloses an ion beam polishing method for coupled silicon carbide in-situ growth based on quantum dots, and belongs to the technical field of SiC surface polishing. The preparation method of the SiC material with the quantum dot sacrificial layer grown in situ comprises the following steps: mixing a lead source, a cesium source and a solvent to obtain a CsPbBr3 precursor solution; and dropwise adding the CsPbBr3 precursor solution to the surface of the SiC material, flattening, heating for crystallization, and annealing to obtain the SiC material with the quantum dot sacrificial layer grown in situ. According to the ion beam polishing method based on quantum dot coupling silicon carbide in-situ growth, the quantum dot layer serves as the sacrificial layer of the SiC wafer, the thickness of the sacrificial layer can be effectively reduced, the flatness of the SiC surface can be remarkably improved, and the good fluorescence labeling effect can be achieved. The CsPbBr3 quantum dot prepared by the method has extremely small nano size, can deeply fill micro cracks and micro-nano scratches on the surface of a SiC wafer, is completely coupled with the micro cracks on the surface of the SiC wafer, and realizes accurate filling of defects.

The invention discloses a high-compaction lithium manganese iron phosphate material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, respectively preparing large-particle-size ferromanganese phosphate and small-particle-size ferromanganese phosphate through an oxidation-reduction reaction, then compounding the large-particle-size ferromanganese phosphate and the small-particle-size ferromanganese phosphate to serve as a precursor for synthesizing the lithium ferromanganese phosphate, and reacting the precursor with raw materials such as a lithium source to prepare the lithium ferromanganese phosphate. The two precursors with specific particle sizes are compounded, so that the small-particle-size precursor can effectively fill gaps of the large-particle-size precursor, the compaction density of the lithium manganese iron phosphate product is further improved, and meanwhile, excellent electrical properties can be realized.

The invention belongs to the technical field of green energy power generation, and discloses a preparation method and application of a plasmon effect enhanced photovoltaic power generation device.The preparation method comprises the steps that a conductive substrate material is evenly dispersed in a solvent and then treated with a reducing agent to form substrate ink; the base material ink is prepared into a three-dimensional structure with pores by utilizing an additive and subtractive material technology, and a stable substrate material is formed through high-temperature treatment; and immersing the stable substrate material in a plasmon metal solution for a first preset time, taking out the substrate material, immersing the substrate material in a reducing agent solution for a second preset time, taking out the substrate material, and curing the substrate material by using an additive and subtractive material technology to form the water photovoltaic power generation device with enhanced plasmon effect. According to the preparation method, a three-dimensional block device with an interface pore structure is constructed through an additive and subtractive material technology, the light absorption capacity is improved, the utilization rate of light energy is improved through plasmon nanoparticles, the interface temperature of the device is increased, extra carriers are provided for the power generation process, and the output power of the device can be improved.