85 results about "Piranha solution" patented technology

The invention discloses a surface modified medical metal material (titanium, titanium alloy, magnesium and magnesium alloy) and a preparation method of the surface modified medical metal material. Medical metal is firstly oxidized in a piranha solution, and an oxide layer is formed on the metal surface; a coupling reagent is used for coupling, and double bonds are led on the surface in a covalence mode; and finally a free radical polymerization method is adopted to cause copolymerization between the medical metal and vinylpyrrolidone monomers so as to lead in polyvinylpyrrolidone macromolecules on the surface of the medical metal in a covalence mode. A surface modified layer of the medical metal material is located on the oxide layer of the medical metal surface, and thickness of the modified layer is located in a micron scale. After the surface modified layer absorbs silver ions, the surface modified layer has a good antibiosis capability on escherichia coli and staphylococcus aureus, and antibiosis rate can achieve higher than 98%. The surface modified medical metal material prepared by the method has a good biological activity, stability and an antibacterial property and is simple in preparation method, free of needs of special equipment, low in production cost and applicable to industrial production.

The invention discloses a method for preparing a graphene film on the surface of titanium alloy. The method specifically comprises the following steps of putting a medical titanium alloy into a piranha solution and carrying out hydroxylation treatment, and then putting into an amino silane solution, and self-assembling a silane film; carrying out ultrasonic treatment on graphene oxide powder to obtain a stable graphene oxide colloid; immersing the titanium alloy of which the surface is attached with the silane film in the graphene oxide colloid to prepare a silane-graphene oxide film; and finally, reducing the graphene oxide film with hydrogen halide acid, and drying to obtain the reduced graphene oxide composite film. The method disclosed by the invention is simple and causes no harm to experiment operators, and the obtained film has the advantages of good integrity, high strength, low coefficient of friction and excellent wear resistance and is expected to become a medical joint material.

The current methods for preparing single-layer molybdenum disulfide include micromechanical exfoliation, liquid-phase ultrasonic exfoliation, lithium ion intercalation, laser method, annealing layer-by-layer thinning method, and chemical vapor deposition method. Molybdenum disulfide prepared by chemical vapor deposition method has large size, uniform surface and controllable layer number. When molybdenum disulfide is prepared by chemical vapor deposition, molybdenum disulfide is easy to nucleate and grow on defects such as impurities or scratches on the substrate. If the substrate is not cleaned cleanly, molybdenum disulfide will easily grow into multi-layer or solid materials. To clean the substrate thoroughly, toxic and dangerous drugs such as acetone and piranha solution will be used. These drugs are toxic to the human body, so the operation process is potentially dangerous. Based on the above problems, the object of the present invention is to provide a simplified chemical vapor deposition method for the preparation of single-layer molybdenum disulfide, which can produce high-quality single-layer molybdenum disulfide without using toxic hazards such as acetone and piranha solution. Drugs are used to clean the substrate, avoiding potential danger.

A preparation method for Si and SiGe quantum spot array includes: carrying out acetone vibration cleaning, alcohol vibration cleaning piranha solution and RCA solution process orderly to a silicon chip or silicon chip deposited with a SiGe film then dropping the styroflex small ball solution with the quality percentage concentration sphere of 0.01-0.9% into the surface cleaned silicon chip or that with SiGe film to be put in air for natural drying then to be heat-insulated under 90-110deg.C for 1-6min and depositing an Ag film of 25-100nm on the substrate wit a vacuum plating instrument, immersing the deposited Ag film sample in the etching solution of hydrofluoric acid and ferric nitrate for process.

The invention provides a preparation method of a silica-based surface carboxylated graphene oxide self-assembled composite film. The method comprises the following steps: 1, after a silicon wafer subjected to processing is cleaned and dried, putting the silicon wafer into a Piranha solution to soak; 2, taking out the silicon wafer in the Piranha solution, cleaning and drying the silicon wafer, adding the silicon wafer into a silane solution to carry out self-assembling reaction, thereby obtaining a product A; 3, taking out the product A, cleaning and drying the product A, thereby obtaining a silicon wafer with a silica-based surface on which an aminosilane film is arranged; 4, putting the product obtained in the step 3 into a graphene oxide solution subjected to carboxylation so as to carry out reaction, thereby obtaining a product B; and 5, taking out the product B, carrying out cleaning, drying and carrying out heat preservation on the product B so as to obtain a final product silica-based surface carboxylated graphene oxide self-assembled composite film. The friction coefficient of a product prepared by using the method disclosed by the invention is 0.18-0.22, and the wear life is greater than 2400 seconds; and the preparation method disclosed by the invention is simple in process and low in cost, and provides convenience for the surface treatment of silica-based parts in micro electro mechanical systems.

The invention relates to a method for preparing superhydrophobic and self-cleaning glass. The method comprises the following steps of submerging common glass in a piranha solution for surface hydroxylation treatment, putting the glass subjected to surface hydroxylation treatment in toluene, adding a silane coupling agent, of which terminal groups are double bonds, into the toluene for surface terminal double-bond treatment, then, covalently grafting a hydrophobic polymer to the surface of the glass by an in-situ polymerization or spraying method, and carrying out cleaning and airing, thereby preparing the superhydrophobic and self-cleaning glass. According to the method for preparing the superhydrophobic and self-cleaning glass, disclosed by the invention, a uniform and chemically-grafted polymer coating can be formed on the surface of the common glass and has good super-hydrophobicity, stability and light transmittance and excellent self-cleaning performance.

The invention relates to a preparation method of anti-fog self-cleaning glass with a composite coating. The method includes the following steps of soaking ordinary glass in a piranha solution to be subjected to surface hydroxylation, putting the glass where surface hydroxylation is conducted in methylbenzene, adding a silane coupling agent with amidogen as the end group to conduct surface end amination, adding the glass where surface end amination is conducted to graphene oxide organic solvent to be subjected to graphene oxide grafting under the effect of a dewatering agent, putting the glass where graphene oxide grafting is conducted in titanium dioxide sol, and conducting sedimentation and vacuum drying to obtain the anti-fog self-cleaning glass with the titanium dioxide and graphene oxide composite coating.

The invention discloses a process for preparing a high temperature resistance polymolecular layer boundary lubrication film for a titanium based material surface. The process comprises the following steps: hydroxylating the surface of a clean titanium based material which is grinded, polished and cleaned by adopting alkali treatment, anode oxidation, Piranha solution treatment and other methods; grating an oxidized graphene nano-wafer on the hydroxylated surface of the titanium based material through a silane coupling agent; putting the titanium based material of which the surface is grafted by the oxidized graphene nano-wafer in an oxidized graphene nano-wafer water solution, performing a radical polymerization reaction and drying to prepare a latticed high temperature resistance polymolecular layer boundary lubrication film, namely hydrogel. According to the method, the abrasion resistance of the surface of the titanium-based material is modified by utilizing the hydrogel organic polymer material for the first time, the advantages of low friction coefficient and good heat tolerance of hydrogel can be played sufficiently, the abrasion resistance of the titanium-based material surface in a dry-state environment can be effectively improved, and the application range of the titanium-based material is enlarged. The process has a definite scientific meaning and great application value.

The method includes following steps: (1) preparation of self-assembly substrate, offering a P type Si(100) substrate that is treated by ultrasonic in organic solvent; after treated by placing into Piranha solution, and it is dried by blowing non-oxidizability gas, and then is treated by OTS solution and is cleaned up by using organic solvent; (2) nano-line etching, the nano-line is etched on self assembly substrate by using current of conduct atomic force microscope, the radius of curvature of pinpoint is less than 50 nm; (3) nanometer generating, the etched substrate is placed in the silver acetate for dipping, and then is taken out to place in ethanol in short time, and then is placed in sodium borohydride aqueous solution for dipping, washing, and then is dried by blowing non-oxidizbility gas, finally the silver enhancement solution is inputted for heighten the electrode line.

The invention discloses a method of utilizing magnetic field orientation to prepare a brick-mud structure heat-conducting polymer composite material. The method includes: ultrasonically treating BN, using a Piranha solution to treat the same, adopting a solvothermal method to prepare treated BN into BN@Fe3O4 magnetic filler, well mixing BN@Fe3O4, graphene oxide and polyvinylidene fluoride in a solvent, heating concentrate until solid content is 70-75%, putting the concentrate into a magnetic field to enable BN@Fe3O4 to be directionally arranged, and drying to volatilize the solvent to obtain the brick-mud structure heat-conducting composite material. The magnetic field is utilized to enable BN@Fe3O4 to be in directional arrangement in a polymer matrix to serve as 'brick' of the composite material, graphene oxide is self-assembled in PVDF with BN@Fe3O4 to form a heat-conducting pathway to serve as 'mud' of the composite material, interface heat resistance with PVDF can be improved, andhigher heat-conducting coefficient can be acquired under certain consumption of the heat-conducting filler.

The invention discloses a method for optimizing an interface of a basalt reinforced resin-based composite material, wherein the method mainly comprises the steps: soaking basalt fibers in a piranha solution for activation to obtain surface-activated basalt fibers; putting the activated basalt fiber into dehydrated and deoxygenated toluene, then adding methyltriethoxysilane, then adding hydrochloric acid to keep the solution acidic, carrying out a reaction for 6-10 h, cleaning and drying to obtain modified basalt fibers; fixing the modified basalt fibers on a mold, making the length of the fibers equivalent to that of the mold, then pouring the resin and curing agent mixed solution into the mold, and carrying out mold pressing to obtain the composite material. According to the method, silicon nanowires grow on the surfaces of the basalt fibers, the surface roughness of the fibers is improved, meanwhile, a large number of active groups such as hydroxyl exist on the silicon nanowires, themechanical meshing and chemical bonding effects between the fibers and resin are enhanced, and the interface performance of the basalt reinforced resin-based composite material is effectively optimized.

The invention discloses a method for constructing an organic micron linear array with a form board assisting in volatilization induced self-assemble. The method comprises the following steps that (1) a substrate is washed through cleaning fluid in an ultrasonic mode, then the substrate is immersed in the piranha solution and processed by an oxygen plasma, and the surface of the substrate is made to have strong wettability; (2) the form board is constructed on the substrate; (3) the micron linear array is grown on the form board, the pre-processed form board is inserted in the organic solution for growth, and through volatilization induced self-assemble, the large-area highly-aligned organic micron linear array is obtained. The method is of great significance to manufacturing of large-area high-performance photoelectron micro-nano devices based on organic optoelectronic materials and further achieving of micro-nano device integration.

The invention discloses a method for preparing fiber-loaded rutile type TiO2 composite SiO2 aerogel. The method comprises the following steps: performing hydroxylation treatment on fiber by using a piranha solution; soaking the fiber after hydroxylation treatment into a TiO2 solution, loading the surface of fiber after hydroxylation treatment with TiO2 sol by using a soaking-lifting method, and performing high-temperature so as to obtain fiber of which the surface is loaded with rutile TiO2; soaking the fiber of which the surface is loaded with rutile TiO2 into SiO2 sol so as to obtain SiO2 composite sol; performing aging, decontamination, solvent replacement, surface modification and normal-pressure drying on the SiO2 composite sol, so as to obtain the fiber-loaded rutile type TiO2 composite SiO2 aerogel. By adopting the method, not only is the problem that TiO2 is not uniformly dispersed in the SiO2 aerogel solved, but also the mechanical properties and the thermal-insulating heat-preservation properties of the SiO2 aerogel can be improved; by adopting the SiO2 aerogel composite material prepared by using the method, infrared radiation heat conduction can be effectively inhibited, and a relatively low heat conduction coefficient can be achieved.

The invention discloses a method for preparing a smooth graphene film by a pulling method. The method comprises the steps: adding graphene oxide into ultrapure water, and carrying out ultrasonic treatment, so as to prepare a uniform graphene oxide aqueous solution; pretreating a glass substrate by sequentially using a piranha solution and a toluene solution of 3-aminopropyl triethoxysilane; submerging the pretreated glass substrate into the prepared graphene oxide aqueous solution, and pulling out the glass substrate at a constant speed, so as to prepare a graphene oxide film; and carrying out reduction on the prepared graphene oxide film by using hydrazine hydrate steam, thereby preparing the graphene film. According to the method, the pulling technology used is simple in operation, low in cost and easy in control, and the prepared graphene film is smooth and uniform and is easily subjected to functional modification.

The invention relates to a three-dimensional nanometer chip and a method for fractionation detection on circulating tumor cells (CTC) by suing the chip, and application of the three-dimensional nanometer chip. The method comprises the steps: stripping and slicing a silicon wafer, heating in a piranha solution, then washing with water, drying by blowing, soaking in a 2 percent APTES ((3-aminopropyl)trimethoxysilane) solution for 2h, respectively cleaning the silicon wafer with absolute ethyl alcohol and deionized water, immersing in a 2.5 percent glutaraldehyde solution for 1h, putting in a culture chamber slide, uniformly dropping 10microgram / ml anti-EpCAM (epoxy resin cell adhesion molecules) on the silicon wafer, reacting for 0.5h at a room temperature, washing out redundant antibodies with a PBS (Phosphate Buffer Solution), and closing by using 25 microL of 1 percent BSA (Bovine Serum Albumin) solution for 1h to prepare the chip, wherein the chip can be used for capturing the circulating tumor cells in peripheral blood. The novel and convenient CTC capturing chip disclosed by the invention is capable of efficiently capturing the tumor cells in a laboortary; and compared with the prior art, the method has the advantages of being simpler, lower in cost and huge in clinical value.

The invention provides a preparation method of a silver island material. The preparation method comprises the following steps: firstly, a silicon wafer is sequentially treated by a piranha solution or a concentrated alkali liquor and sulfydryl silane, so that a modified silicon wafer is obtained; and secondly, an aldehyde compound is added to a silver-ammonia solution to react, the modified silicon wafer is added to the reaction system, a reaction product, silver, deposits on the surface of the silicon wafer, and the silver island material is obtained. According to the preparation method of the silver island material, the surface of the silicon wafer is modified before a silver island film is formed, so that the silver island film can be firmly fixed to the surface of the silicon wafer, and the silver island film is prevented from falling off in the follow-up application and treatment processes. By the adoption of the preparation method, the thickness of the silver island film can be controlled to be smaller than 100 nm, and the prepared silver island film is stable in size and has a relatively high capability of sensing SERS signals.

The invention relates to a method for assembling differently charged metal nanoparticles onto the surface of a substrate in a bidirectional and controllable manner. The method comprises the followingsteps of (a) placing the substrate into Piranha solution for surface hydroxylation, and washing and then immersing the surface-hydroxylated substrate into a mixed solution of 3-aminopropyl triethoxysilane, ethanol and water for surface positive charge functional group modification to obtain a first modified substrate, wherein the volume ratio of 3-aminopropyl triethoxysilane, ethanol and water inthe mixed solution is 1:50-150:0.5-5; (b) immersing the first modified substrate into succinic anhydride acetone solution for reaction to obtain a second modified substrate; (c) immersing the second modified substrate into metal nanoparticle solutions with different surface charge properties for self-assembly, then extracting, washing and blow-drying the immersed second modified substrate. Therefore, the method for assembling the differently charged metal nanoparticles onto the surface of the substrate in the bidirectional and controllable manner achieves self-assembly of differently charged metal nanoparticles and ensures a bidirectional and controllable process.

The invention discloses a method for grating a polymerized ammonium sulphonate inner salt on the surface of glass. An ammonium sulphonate inner salt monomer is taken as a grating monomer on a glass substrate, and a simple silane coupling agent grating method is used to construct a molecular structure of the polymerized ammonium sulphonate inner salt on the surface of the glass. The grafting method is as follows: a glass sheet is treated by a Piranha solution to produce a hydroxide radical on the surface of the glass, then the glass sheet is reacted with a silane coupling agent, vinyl produced on the surface of the glass is finally polymerized in a grafting manner with the ammonium sulphonate inner salt monomer, so that the molecular structure of the ammonium sulphonate inner salt is constructed on the surface of the glass. The method has the advantages that the molecular structure of the ammonium sulphonate inner salt is proved to have an excellent anticoagulant activity, the molecular structure of the ammonium sulphonate inner salt is directly constructed on the surface of the glass after the ammonium sulphonate inner salt monomer is reacted with an active functional group of the silane coupling agent, so that a novel anticoagulant biomaterial having excellent anticoagulant activity and mechanical property is obtained.

The invention discloses a method for directionally preparing theophylline-saccharin eutectic through a membrane technology. The method comprises the steps of: 1) dipping a glass sheet in Piranha solution, heating the solution, taking out the glass sheet, washing the glass sheet, drying the glass sheet to obtain a hydroxylated glass sheet, placing the hydroxylated glass sheet in water solution containing silane coupling agent, and hermetically placing at room temperature to obtain a glass sheet with a silanized surface; and washing and drying the glass sheet to obtain a silane single-molecule self-assembled monolayer on the surface of the glass sheet; and 2) adding theophylline and saccharin into a container containing methanol or ethanol, heating to dissolve solids; and cooling the solution, placing the glass sheet with the single-molecule self-assembled monolayer on the surface, slowly evaporating solvent at constant temperature being 25-40DEG C, growing a large quantity of theophylline-saccharin eutectic crystals on the surface of the single-molecule self-assembled monolayer within 2-7 days, taking out the glass sheet on which the eutectic crystals grow, washing the glass sheet, and taking the theophylline-saccharin eutectic crystals down after the surface of the glass sheet is dried. According verification through XRD (X-Ray Diffraction), by adopting the method, pure theophylline-saccharin eutectic can be obtained within a wider concentration range.

The invention discloses a large-area aluminum single crystal film and a preparation method and application thereof. The preparation method comprises the following steps: sequentially carrying out organic cleaning, RCA1 cleaning, RCA2 cleaning, piranha solution cleaning and HF cleaning on a Si (111) substrate to obtain a pretreated Si (111) substrate; and under a vacuum condition, placing the pretreated Si (111) substrate in a molecular beam epitaxy device for surface treatment, and growing an aluminum single crystal film on the surface of the Si (111) substrate by adopting a molecular beam epitaxy technology to obtain the large-area aluminum single crystal film. Compared with a Si substrate traditional technology, the Si (111) / Al single crystal film prepared through the method has the advantages that a large-area Al single crystal film is achieved, twin crystals do not exist, the content of C, H and O impurities on a Si / Al interface can be obviously reduced, the intrinsic quality factor of a resonator is improved to 106, and preparation of high-quality superconducting quantum bits or superconducting quantum computers is facilitated.

The invention discloses a volatile benzene adsorbing material and a preparation method thereof, and belongs to the technical field of material adsorption. The adsorbing material is activated fiberglass cotton, and the preparation method thereof comprises the following steps: under a stirring condition, slowly dropwise adding concentrated sulfuric acid with the volume percentage of 98% into an aqueous hydrogen peroxide solution with the volume percentage of 30% to prepare a piranha solution, wherein the volume ratio of the concentrated sulfuric acid to the aqueous hydrogen peroxide solution is7:3; then, adding fiberglass cotton, reacting at room temperature for 24 hours while stirring, taking out, washing by using ethanol, and drying in a drying oven to obtain the activated fiberglass cotton. The adsorbing material has a good effect of adsorbing benzenes, and for different benzenes, the aniline adsorbing efficiency is up to 63%.

The invention discloses a method for modification of steel fibers of a semi-metallic formula brake disc. The method comprises the following steps of 1, carrying out immersion by a sodium carbonate solution for oil removal, 2, immersing steel fibers in a dilute piranha solution, 3, treating the steel fibers by a coupling agent solution to coat films on the surfaces of the steel fibers, and 4, carrying out heat treatment for film curing, and carrying out scattering to obtain steel fibers coated with uniformly-distributed and suitable-thickness organic films. The method can successfully modify the steel fibers and solves the problem that a metal friction plate has poor heat fading performances and a short service life and produces rust easily. Through use of the modified steel fibers as a metal brake disc raw material, brake disc heat fading performances and a service life are greatly improved.

The invention provides a Josephson junction satisfying a large wafer size, a preparation method and an application. The Josephson junction is prepared by preparing a Ta (110) film on a substrate, preparing a superconducting circuit structure through photoetching, forming a lower electrode Ta (110) layer through mask photoetching, preparing a Ta2O5 oxide layer on the surface of the lower electrode Ta (110) layer as an intermediate layer, and forming an upper electrode Ta (110) layer through mask photoetching. The Ta (110) superconducting thin film is used as the lower electrode and the upper electrode of the Josephson junction, the Ta2O5 oxide layer on the surface of the Ta (110) superconducting thin film has the characteristics of compactness, stability and the like, passivation and optimization can be performed by adopting a piranha solution, photoetching residual glue is further removed, the stability of a superconducting circuit structure and the Josephson junction is ensured, the method has the characteristics of simple process steps, stability, controllability, high integration level and the like, and the method is suitable for large-scale production. Uniform and stable Josephson junctions in a large wafer size range can be prepared, and the method is suitable for regulation and control of Josephson junctions with different areas.

Provided is a fabrication method of print head of MCM device formed micro patterned air gap capable of picoliter-scale droplet printing, and more particularly, is characterized in that comprising preparing silicon wafer 10 washed by piranha solution at step A, stacking silicon nitride films 20 and 20′ up front surface and back surface of prepared silicon wafer at step B, drying after applying photoresists 30 and 30′ to top surface and bottom surface of the silicon nitride film 20 and 20′ at step C, removing partially the photoresists through pre-determined pattern by irradiation of ultraviolet after arranging photomask 40 formed through pre-determined pattern in any one side of the photoresists 30 and 30′ at step D, forming sample droplet storage space opening by removing silicon nitride film 21 contacted to photoresists removed by pre-determined pattern at step E, removing the photoresists 30 and 30′ stacked up the silicon nitride film 20 and 20′ at step F, forming sample droplet storage space 50 by etching the silicon wafer at step G, and forming sample droplet opening 60 by irradiating ultrasonic waves at step H.

The invention discloses a preparation method of an immunosensor sensitive membrane for detecting antigens. It oxidizes the dried substrate by immersing it in piranha lotion until hydroxyl groups are evenly distributed on the surface of the substrate, and then reacts the hydroxyl groups on the surface of the substrate with the hydrolyzed 3-aminopropyltriethoxysilane until 3-aminopropyltriethoxysilane nanoparticles are evenly distributed on the surface of the substrate, and then the 3-aminopropyltriethoxysilane nanoparticles on the surface of the substrate are combined with protein A or protein G, and then passed on the above substrate The antibody corresponding to the antigen to be detected is dropped on the surface, so that protein A or protein G can bind to the antibody. The method of the present invention overcomes the shortcomings of weak connection of antibody molecules, effectively maintains the activity of antibody reactive molecules, and utilizes the specific orientation of protein A and protein G to improve the effectiveness of antibody-antigen binding by effectively controlling the consistency of antibody orientation. Thereby increasing the sensitivity of the sensor.

The invention provides a method for preparing the size-controllable nanoneedle type electrode, a laser drawing instrument is used for preparation, and compared with an existing nanoelectrode preparation technology, the size of a glass tube, drawing parameters, the drawing process and the electrode polishing end point are selected and designed. And the gold and platinum nano electrode with controllable electrode size is obtained by using a simpler and more effective method. And the fitting and melting conditions of the metal wire in the capillary tube in each drawing step are observed through a metallographic microscope, an electrode polishing end point feedback circuit is designed, and the polishing size of the electrode is accurately monitored. A piranha solution is used for treating the surface of the polished electrode, a scanning electron microscope (SEM) is combined for characterizing the accurately polished electrode, the apparent size of the nanoelectrode is tested through limiting current cyclic voltammetry, and the electrode with the minimum size of 6.4 nm can be prepared. And the size of the electrode is not changed after multiple cyclic voltammetry tests, so that the electrode prepared by the method has relatively high stability.

The invention relates to a making method of a spherical layered antimony sulfide film, and belongs to the technical field of production of functional materials through liquid phase deposition. A technical scheme adopted in the invention is characterized in that the method comprises the following steps: dissolving 0.003mol of analytically pure Na2S2O3.5H2O in deionized water, dissolving 0.002mol of analytically pure SbCl3.2H2O in concentrated HCl, mixing the above obtained two solutions, allowing the final volume of the mixed solution to 100ml, magnetically stirring the solution for 5min, and adding ammonia water in a dropwise manner to adjust the pH value of a precursor solution to realize different pH values; carrying out ultrasonic cleaning in distilled water, acetone and anhydrous ethanol for 30min, immersing in a piranha solution, carrying out nitrogen blow drying, and depositing the obtained glass substrate in the film precursor solution; and carrying out heat treatment on films obtained at different deposition temperatures for different deposition times at a certain temperature for 2h to obtain the spherical layered antimony sulfide film. The spherical layered antimony sulfide film is made on the glass substrate through a liquid phase deposition technology, and the method has the advantages of cheap making device, normal temperature and normal pressure making environment, and simple process flow.

The invention discloses a layered array method and device for depositing metal nanoparticles on a fiber end face. The method comprises the steps as follows: pretreatment of the fiber end face is carried out by using a piranha solution and a silane solution, and a monomolecular layer which can be combined with the metal nanoparticles firmly and easily is formed on the fiber end face; a reducing solution containing metal salt and a reducing agent is prepared, and two beams of laser are enabled to intersect and generate interference; and the fiber end face is placed in the intersecting area of the two beams of the laser in the reducing solution, and the periodic metal nanoparticle layered array corresponding to interfering light spots is formed on the fiber end face. Light for a deposition reaction is formed by interference generated by two beams of laser; the influence of optical fiber on reaction light is avoided; and the controllability of the silver nanoparticle deposition on the fiber end face is enabled to be higher.

The present invention discloses a method for preparing a perovskite quantum dot fluorescent ring from methylammonium lead bromide perovskite quantum dots. The method comprises: 1, washing a glass slide, wherein a piranha solution (comprising concentrated sulfuric acid and 30% hydrogen peroxide according to a ratio of 7:3) is poured, boiling is performed, an ethanol solution and a deionized water solution are sequentially poured, ultrasonic cleaning is respectively performed for 15-30 min, the glass slide is taken out, and blow drying is performed with nitrogen; 2, dissolving the dimethylformamide (DMF) solution of methylammonium lead bromide perovskite quantum dots in toluene to prepare a methylammonium lead bromide perovskite quantum dot toluene solution; and 3, dropping the methylammonium lead bromide perovskite quantum dot toluene solution on the glass slide by using a pipette, and waiting at a room temperature until the methylammonium lead bromide perovskite quantum dot toluene solution is dried so as to obtain the perovskite quantum dot fluorescent ring. According to the present invention, the perovskite quantum dot fluorescent ring is prepared based on the methylammonium lead bromide perovskite quantum dots, such that the self-assembly of the methylammonium lead bromide perovskite quantum dots is achieved, and the methylammonium lead bromide perovskite quantum dot fluorescent ring preparation method is firstly provided.

The invention discloses a preparation method of light trapping glass for a thin film solar cell. The method comprises the following steps: S1, immersing a glass substrate into a piranha solution and cleaning the glass substrate; S2, placing the glass substrate in a magnetron sputtering cavity, and adopting Ar ion beams to bombard the surface of the glass substrate for further cleaning of the glasssubstrate; S3, adopting an AZO target with Al dosage concentration being 0.5wt%-1.5wt% as a target material, and growing a first AZO thin film by sputtering with a radio-frequency and direct-currentcoupled sputtering technology; S4, adopting an AZO target with Al dosage concentration being 1.5wt%-2.5wt% as a target material, and growing a second AZO thin film by sputtering with the radio-frequency and direct-current coupled sputtering technology; S5, adopting an Ag target material, and growing an Ag thin film by sputtering with the radio-frequency and direct-current coupled sputtering technology; S6, adopting an AZO target with Al dosage concentration being 2.5wt%-3.5wt% as a target material, and growing a third AZO thin film by sputtering with the radio-frequency and direct-current coupled sputtering technology. With adoption of the method, haze and electrical properties of the light trapping glass can be improved, and AZO transparent conducting glass with high light transmittance and a light trapping function can be obtained.