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39results about How to "Good spectral selectivity" patented technology
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Micro-nano structure preparation method on metallic material surface using femtosecond laser
InactiveCN101380693AHeat conduction effects are reduced and eliminatedHigh peak powerLaser beam welding apparatusMicro nanoNano structuring
The invention discloses a method for preparing a micron / nano structure on the surface of a metal material by using femtosecond laser. The preparation steps thereof are as follows: after mechanical grinding and polishing are carried out on the surface of the metal material, then the surface is ultrasonically washed by ionized water; a femtosecond laser technique is adopted: in the air environment, a 10*micro objective is used for vertically focusing an incident femtosecond laser pulse on the surface of the material; the radius of a laser beam at the focus position is 5 microns; besides, the surface of the material is adjusted to the position which has 10 to 250 microns to the focus plane of the objective along the reverse direction of the beam, thus being capable of generating the micron / nano structure on the surface of the metal material by inducing. The method has the advantages of simple technique, being convenient and practical, no pollution and being capable of improving and enhancing the thermal radiation efficiency of the material in a broad spectrum range.
Owner:NANKAI UNIV
Super-hydrophobic daytime passive radiation refrigeration porous membrane and preparation method thereof
ActiveCN113025133AImprove hydrophobicityImprove cooling effectReflecting/signal paintsOrganic solventPorous membrane
Owner:ZHEJIANG SCI-TECH UNIV
Spectrally selective solar absorbing coating and a method for making it
ActiveUS20180076342A1High refractive indexEnhance solar absorptanceSilicaSolar heat devicesNitrogen gasMetal
Disclosed is a spectrally selective solar absorbing coating and a method for making same. The spectrally selective solar absorbing coating includes a multilayer stack including, from the substrate to the air interface: substrate (1), infrared reflective layer (2), barrier layer (3), composite absorbing layer (4) consisting of metal absorbing sublayer (4.1), metal nitride absorbing sublayer (4.2), and metal oxynitride absorbing sublayer (4.3), and antireflective layer (5). Therefore, the solar absorbing coating has good high and low temperature cycle stability and superior spectrum selectivity, with a steep transition zone between solar absorption and infrared reflection zones. It has a relatively high absorptance α>95%, and a low thermal emissivity ∈≦4%, PC (performance criterion)=−0.3. The solar absorbing multilayer stack can be obtained by reactively magnetron sputtering the metal target in argon or other inert gas with some amounts of gas containing oxygen or nitrogen or their combination.
Owner:CHINA BUILDING MATERIALS ACAD
Intra-cavity second harmonic generation (SHG) laser device
ActiveUS20120051375A1Good spectral selectivityIncrease cavity lengthOptical resonator shape and constructionSelective reflectionOptoelectronics
A laser device for intra-cavity frequency conversion, in particular, for the second harmonic generation, the device comprising a laser cavity, formed by the first and the second laser cavity end reflectors wherein the said laser cavity end reflectors are highly reflective for the radiation about the laser fundamental frequency and as such provide for a predetermined level of circulating inside the cavity fundamental frequency power; an active medium provided within the said laser cavity; at least one non-linear crystal, in particular, for the second harmonic generation provided within the same laser cavity; tuning means adapted for tuning at least one of laser cavity end reflectors; wherein at least one of the laser cavity end reflectors comprises an interferometric layout providing spectrally selective reflection for the radiation about the laser fundamental frequency with the value of reflectivity nearly to 100% within a spectral range close to the free spectrum range of the laser cavity and with a sufficiently lower reflectivity outside the above spectral range such that the laser cavity restricts the spectrum of the laser radiation to a single longitudinal mode.
Owner:UNIKLASERS
Self-powered photoelectric detection structure based on graphene-gallium oxide phase junction, device and preparation method
InactiveCN110085688ASelf-poweredEasy to self-powerFinal product manufactureSemiconductor devicesPhotovoltaic detectorsUltraviolet lights
The invention discloses a self-powered photoelectric detection structure based on graphene-gallium oxide phase junction, a corresponding preparation method and a photoelectric detector. The structurecomprises a substrate, gallium oxide phase junction nano columns formed on the substrate and a graphene film formed on the gallium oxide phase junction nano columns. The method comprises the steps ofgenerating gallium oxide phase junction nano columns on the substrate through hydrothermal, annealing and high temperature annealing, and transferring and forming a graphene film on the gallium oxidephase junction nano columns. The structure has the advantages of simple preparation process, low cost, easy mass production and the like. The photoelectric detector has the characteristics of self-power supply and good spectral selectivity, and has the properties such as high responsiveness and high sensitivity to sunblind ultraviolet light.
Owner:唐为华
Nanometer ceramic solar film
InactiveCN102837460AGood spectral selectivityImprove transmittanceSynthetic resin layered productsVacuum evaporation coatingInfraredThermal insulation
The present invention relates to a nanometer ceramic solar film. According to the nanometer ceramic solar film, a firs layer titanium dioxide film, a second layer titanium nitride film and a third titanium dioxide film are sequentially plated on a surface of a substrate PET through magnetron sputtering, wherein a thickness of the substrate PET is 23-50 mum, a thickness of the first layer titanium dioxide film is 26-38 nm, a thickness of the second layer titanium nitride film is 20-26 nm, and a thickness of the third layer titanium dioxide film is 26-38 nm. The nanometer ceramic solar film of the present invention has the following characteristics that: good spectral selective permeability, high transmittance in a visible light region, and high reflectivity in an infrared region are provided, wherein infrared rays are blocked so as to reduce heat source, such that thermal insulation is achieved while transmittance on visible light is not affected; and titanium dioxide and titanium nitride have high chemical stability at a room temperature, are not easily oxidized, and do not react with oxygen, water, steam, hydrochloric acid, sulfuric acid and the like under normal circumstances, such that performances are stable, fading and discoloration can not be generated, and a service life is long.
Owner:SOUTHWESTERN INST OF PHYSICS
Solar selective absorbing coating and preparation method thereof
ActiveCN105091377AImprove thermal stabilityImprove absorption rateSolar heat devicesVacuum evaporation coatingRadianceThermal stability
The invention provides a solar selective absorbing coating. The solar selective absorbing coating is sequentially provided with a substrate, an infrared reflection layer, a transition layer, a composite absorbing layer and an antireflection layer from the bottom layer to the surface. Besides, the transition layer is arranged to be made of one or more of CrNx, yCrN*(1-y)Cr2O3, ySi3N4*(1-y)SiO2, yAlN*(1-y)Al2O3 and yTi3N4*(1-y)TiO2, wherein x is larger than 1 and smaller than 1.5, and y is larger than 0 and smaller than 1. Thus, the coating can effectively prevent mutual diffusion between the infrared reflection layer and the absorbing layer, and mutual diffusion among the infrared reflection layer, a diffusion impervious layer and the absorbing layer in the solar selective absorbing coating comprising the diffusion impervious layer The thermal stability of the solar selective absorbing coating is improved, so that the solar selective absorbing coating still has high solar spectral absorptivity and low infrared radiance under the atmospheric condition of 400 DEG C. The solar selective absorbing coating has the good thermal stability and excellent spectral selectivity.
Owner:CHINA BUILDING MATERIALS ACAD
Method for producing 541 nano narrow band-pass photoelectric detector
InactiveCN1933193AImprove stabilityImprove reliabilityFinal product manufactureSemiconductor devicesPhotovoltaic detectorsPeak value
This invention relates to a method for processing 541nm narrow band-pass photo-detector including the following steps: feeding a substrate of N type silicon epitaxial plate into a calcar to grow an oxidation layer to be injected with B ions, sending silicon plates into a LPCVD oven to grow Si3N4 layer, etching zone P leading hole and pressure weld point window, evaporating Al to be counter-etched and alloyed, thinning the back to evaporate Au to be alloyed, scribing it to process 541nm peak value wavelength narrow band-pass filter plates with the ITO film, which is ohm-contacted with a metal tube cap then to be packaged.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Solar spectrum selective absorption coating and its manufacturing method
InactiveUS20150316289A1Good spectral selectivityReduce concentrationSolar heat devicesVacuum evaporation coatingAbsorptanceManufacturing technology
A solar spectrum selective absorption coating is disclosed. The coating includes, from the substrate to the air interface: substrate 1, infrared reflective layer 2, semiconductor absorption layer 3 (Ge), and antireflection layer 4 formed by a higher refractive-index dielectric layer 41 and a lower refractive-index dielectric layer 42. The solar spectrum selective absorption coating has superior spectrum selectivity, with a steep transition zone between solar absorption and infrared reflection zones. It has a relatively high absorptance α in the solar spectrum range (0.3-2 μm), and a very low absorptance / emissivity ε in the infrared thermal radiation spectrum range (2-50 μm); its a / c ratio is significantly higher than current commercially available products, making it suitable for medium-temperature solar heat collectors using low-power optical concentration. The manufacturing process is simple and does not require complex deposition equipment, so it is suitable for low-cost large-scale production.
Owner:TAHOE TECH
Thermally wavelength tunable lasers
InactiveUS6925098B2Good spectral selectivityWide wavelength tuning rangeLaser detailsLaser optical resonator constructionRefractive indexLength wave
Embodiments of wavelength tunable lasers are disclosed. The wavelength tunable lasers include thermo-optic organic material that has an index of refraction that can quickly vary in response to changes in temperature. By controlling the temperature in the thermo-optic organic material through the use of heaters or coolers, the wavelength tunable lasers and the integrated optical components can be quickly and selectively tuned over a broad range of wavelengths with high spectral selectivity.
Owner:INTEL CORP
Preparation method of low-cost selective coating for solar thermal collector
InactiveCN102080227ALow costImprove thermal conductivityMetallic material coating processesWater bathsSolar thermal collector
The invention aims to provide a preparation method of a low-cost selective coating for a solar thermal collector, comprising the following steps: (1) adding alkali and oxidant into deionized water at a molar ratio of (1-5):1, fully stirring to obtain a first evenly-mixed solution, and putting into a constant-temperature water bath of 20-100 DEG C; (2) mixing ammonium persulphate, ammonium chloride, deionized water and pyridine at a molar ratio of 1:(1-10):(10-100):(0-0.1), and fully stirring to obtain a second evenly-mixed solution; (3) slicing a copper sheet into proper size, and putting the sliced copper sheets into the solution obtained in the step (2) to react for 10-30 minutes; putting into the solution obtained in the step (1) to react for 5-60 minutes; and taking out after the reaction, washing with deionized water, and drying in air at 50-100 DEG C to obtain the selective coating for a solar thermal collector. The method has low cost and is easy to widely popularize. Meanwhile, the prepared coating not only has good solar absorbability, but also has lower emission characteristics in the infrared radiation wave band.
Owner:四川中科百博太阳能科技有限公司
A method for detecting beam polarization spectral characteristics
InactiveCN102261955AThe implementation method is simple and flexibleLow structural positioning requirementsPolarisation spectroscopyLight polarisation measurementPhotodetectorLight spot
The invention relates to a method for detecting the polarization spectrum characteristic of light beams. The prior art system is complicated and the sensitivity of spectral measurement is low, and it is impossible to realize the detection of the polarization state distribution of the light beam and the simultaneous detection of polarization and spectral characteristics. The invention utilizes a flexible polarizing film to make a conical light beam polarization detection element, and a flat electro-optic crystal coated with a high-reflection film on both sides is provided with parallel light-transmitting electrode plates, which are connected to an adjustable power supply. Constitute a microcavity line scanning element; the incident beam passes through the conical beam polarization state detection element, the microcavity line scanning element, the beam converging element and the area array photodetector in turn, and the area array photodetector collects spectral information and The light spot of the polarization distribution is obtained, and then the polarization spectral characteristics of the beam are obtained. The method of the invention is simple and flexible, has low structural positioning requirements, simultaneously realizes high-precision spectrum measurement and beam transverse polarization state distribution analysis, has high system reliability and stability, and has strong operability.
Owner:HANGZHOU DIANZI UNIV
Manufacturing method of two-dimensional ordered TiO2 nanometer well film and application in self-energized photoelectric device
ActiveCN106340445AQuick and responsiveImprove photoresponsivityMaterial nanotechnologyFinal product manufactureHeterojunctionManufacturing technology
The invention belongs to the photoelectric device technology field and especially discloses a manufacturing method of a two-dimensional ordered TiO2 nanometer well film and an application in a self-energized photoelectric device. In the invention, firstly, a two-dimensional ordered TiO2 nanometer well film is manufactured; and then the manufactured TiO2 nanometer well film is taken as a substrate so as to manufacture a heterojunction compound with inorganic-substance layered NiO organic semiconductor polyaniline; and a self-energized photoelectric detector is constructed. The method comprises the following steps of anodic oxidation, physical stripping, heating calcinations, low temperature hydrothermal treatment, in situ polymerization and the like. In the invention, a complex and expensive manufacturing technology of the photoelectric device is avoided and rapid construction of a large-scale device can be realized; a photovoltaic effect of a p-n junction is used, under zero-bias driving, photon-generated carriers are rapidly separated under a built-in potential effect, self-energized performance of the device is realized and a light current is stable and a response speed is fast; and for ultraviolet light, good selection performance is possessed, and the photoelectric detector can be served as an energy-saving high frequency detector and a high-frequency photoelectric converter and can be applied in the fields of optical communication, military, medical treatment, photoelectric storage and the like.
Owner:FUDAN UNIV
Boro-isoindole fluorescent dye and preparation method and applications thereof
ActiveCN106946919AGood spectral selectivityHigh fluorescence quantum yieldGroup 3/13 element organic compoundsFluorescence/phosphorescenceSolubilityQuantum yield
The invention discloses a boro-isoindole fluorescent dye and a preparation method and applications thereof. The structure of the boro-isoindole fluorescent dye is represented by the formula (I). The provided boro-isoindole fluorescent dye has the advantages of good spectral selectivity, excellent fluorescence quantum yield, and good solubility, can carry out derivation through Knoevenagel reactions, has high water solubility and a good cell penetrating performance after salt forming, and can be applied to imaging for positioning mitochondria at the same time.
Owner:ANHUI NORMAL UNIV
Preparation method of transparent heat insulation and cooling coating for electric vehicle hood
InactiveCN109161321AGood dispersionEnhanced ability to reflect solar radiationPolyurea/polyurethane coatingsReflecting/signal paintsIndium tin oxideSlurry
The invention discloses a preparation method of transparent heat insulation and cooling coating for an electric vehicle hood. The preparation method comprises the following steps: adding deionized water in waterborne polyurethane resin, uniformly stirring at high speed to obtain a film-forming agent, mixing the film-forming agent with nanometer tin antimony oxide waterborne slurry, nanometer indium tin oxide waterborne slurry and nanometer lanthanum hexaboride heat insulation slurry and the cladding modified hollow glass beads, stirring at high speed, adding auxiliaries, ultrasonically dispersing after quickly stirring, leaving to stand to defoam and then filtering to obtain the transparent heat insulation and cooling coating. Since the titanium dioxide is high in sunlight reflectivity, alayer of titanium dioxide film is adhered on the surface of the hollow glass beads, the dispersion effect of the hollow glass beads in the waterborne coating can be improved, and the capacity of reflecting the solar radiation is enhanced at the same time, and then the aim of cooling is achieved.
Owner:JIESHOU LANDROVER VEHICLE IND
Metal and dielectric compounded high-temperature-resistant solar spectrum selective absorption structure
ActiveCN112882138AReduce transmittanceImprove absorption rateCoatingsPhotovoltaic energy generationDielectricAbsorptance
The invention discloses a metal and dielectric compounded high-temperature-resistant solar spectrum selective absorption structure, and aims to achieve high absorptivity in a wide spectrum from visible light to near-infrared light and realize efficient absorption of solar energy under a high-temperature condition. The structure comprises a bottom metal film, a first dielectric medium film is formed on the bottom layer metal film, an array formed by a plurality of metal nanometer quadrangular star-shaped prisms is formed on the first dielectric medium film, a cylindrical hole is formed in the center of each metal nanometer quadrangular star-shaped prism, the cylindrical holes are filled with dielectric medium filler, a second dielectric film is formed in the periphery of each metal nanometer quadrangular star-shaped prism, a third dielectric film is formed on the metal nanometer quadrangular star-shaped prisms, the dielectric filler and the second dielectric films, and the second dielectric films and the third dielectric films are in quadrangular star shapes.
Owner:CENT SOUTH UNIV
Coated aluminum powder and preparation method thereof and coating material containing coated aluminum powder
ActiveCN113388272AImprove mechanical propertiesImprove adaptabilityPigment treatment with organosilicon compoundsCamouflage paintsMalachite greenXylylene
The invention provides coated aluminum powder. The coated aluminum powder is prepared from the following raw material components in parts by mass: 10-26 parts of aluminum powder, 5-14 parts of a coloring pigment, 20-50 parts of a solvent, 0.1-1 parts of an etching substance, and 0.04-0.1 parts of an auxiliary agent, wherein the aluminum powder is oily non-floating aluminum powder, the coloring pigment is one of phthalocyanine blue, cobalt blue, malachite green, carbon black, bright red, medium chrome yellow and permanent yellow, the solvent is at least one of xylene, butyl ester, ethanol, 120 # solvent oil and DMF, the etching substance is one of oleic acid and acetic acid, and the auxiliary agent is at least one of a silane coupling agent and a dispersing agent. According to the invention, the coated aluminum powder can be well dispersed in the coating and has the advantages of being low in brightness, adjustable in color and emissivity and the like, and the preparation method is simple in process, low in price, suitable for mass production and capable of being applied to military protection, civil art coating, building coating material and the like.
Owner:上海戎科特种装备有限公司
Angle limiting reflector and optical dispersive device including the same
InactiveUS20160025567A1Wide wavelength rangeSmall sizeRadiation pyrometrySpectrum investigationPrismWavelength selectivity
Owner:VIAVI SOLUTIONS DEUT
A superhydrophobic diurnal passive radiation cooling porous film and its preparation method
ActiveCN113025133BImprove hydrophobicityImprove cooling effectReflecting/signal paintsOrganosolvPorous membrane
Owner:ZHEJIANG SCI-TECH UNIV
Medium-high-temperature solar selective absorbing coating and preparation method thereof
PendingCN108441836AImprove thermal stabilityImprove adhesionVacuum evaporation coatingSputtering coatingLow emissivityHeat stability
The invention relates to a medium-high-temperature solar selective absorbing coating and a preparation method thereof. The medium-high-temperature solar selective absorbing coating comprises an existing metal substrate. The medium-high-temperature solar selective absorbing coating is characterized in that the metal substrate comprises an infrared reflecting layer, an absorbing layer and an antireflection layer from bottom to top; the infrared reflecting layer is a coating of any one of Al, Au, Ag and Ni, the absorbing layer sequentially comprises a TiN film and a TiCrN film from bottom to top,and the antireflection layer sequentially comprises a Cr2O3 film, an AlN film and an Al2O3 film from bottom to top; and film coating is carried out through a magnetron sputtering method. The medium-high-temperature solar selective absorbing coating has the beneficial effects that 1, the prepared coating has the characteristics of high absorbing efficiency, low emissivity and good heat stability;2, the ratio of the solar spectrum emissivity alpha to the emissivity epsilon (T) is high, and the coating is suitable for being applied to medium-high temperature of 200 DEG C or above; and 3, the manufacturing process is simple and convenient.
Owner:(CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
Spectrally selective solar absorbing coating and a method for making it
ActiveUS10586879B2Good spectral selectivityHigh solar absorption rateSilicaVacuum evaporation coatingIr reflectionAbsorptance
Owner:CHINA BUILDING MATERIALS ACAD
Graphene-based selective absorption film system and absorbing layer preparation method thereof
InactiveCN111397231AGood spectral selectivityLow infrared reflectivityCoatingsSolar thermal energy generationIr reflectionReduction treatment
The invention discloses a graphene-based selective absorption film system and an absorbing layer preparation method thereof. The preparation method of the graphene absorbing layer in the film system is mixed solution coating and comprises the steps that graphite power is subjected to oxidation stripping to obtain an oxidized graphene aqueous solution; the oxidized graphene aqueous solution is mixed with a lower surface tension solution to obtain a mixed solution; the mixed solution is coated to the surface of an infrared reflecting layer, so that an oxidized graphene absorbing layer is obtained; and the oxidized graphene absorbing layer is subjected to reduction treatment to obtain the graphene absorbing layer. The graphene absorbing layer has good refractive index and extinction coefficient, so that the excellent spectral selectivity of the graphene-based selective absorption film system is ensured, and the photo-thermal utilization efficiency of the selective absorption surface is improved. Meanwhile, the thickness of the graphene layer is changed to adjust an optical band gap of the film system, and the graphene-based selective absorption film system further has a solar energy utilization system which has stability for a long time at high temperature, is matched with the optical band gap and can be widely applied to low temperature to high temperature.
Owner:TSINGHUA UNIV
Flexible solar blind detector of small organic molecule-gallium oxide heterojunction and preparation method of flexible solar blind detector
PendingCN113113543AStay flexibleMaintain biocompatibilitySemiconductor/solid-state device testing/measurementSemiconductor/solid-state device detailsHeterojunctionEngineering
The invention belongs to the technical field of photoelectric conversion, and particularly relates to a flexible solar blind detector of a small organic molecule-gallium oxide heterojunction and a preparation method of the flexible solar blind detector. The detector comprises a PET / ITO flexible substrate, an a-GaO light absorption layer, an NPB layer, a first test electrode and a second test electrode, the PET / ITO flexible substrate comprises a PET layer and an ITO layer located on the PET layer; the a-GaO light absorption layer is positioned above the ITO layer deviating from the PET layer; and the NPB layer is located on the face, away from the PET / ITO flexible substrate, of the a-GaO light absorption layer. The second test electrode is positioned at one side, deviating from the PET layer, of the ITO layer; and the first test electrode is located at one side, deviating from the a-GaO light absorption layer, of the NPB layer, wherein the a-GaO light absorption layer and the NPB layer form an a-GaO / NPB heterojunction, and a built-in electric field is formed, so that photon-generated carriers are separated. The detector has the self-powered performance, is flexible, well meets the requirements of wearable devices, and has potential application prospects in the field of intelligent monitoring.
Owner:金华紫芯科技有限公司
Method for producing 541 nano narrow band-pass photoelectric detector
InactiveCN100477296CImprove stabilityImprove reliabilityFinal product manufactureSemiconductor devicesPhotovoltaic detectorsPeak value
Owner:BEIJING UNIV OF POSTS & TELECOMM
Photovoltaic module
PendingCN112736156AGood UV resistanceGood spectral selectivityPhotovoltaic energy generationSemiconductor devicesPhysicsFilm structure
The invention provides a photovoltaic module which comprises a photovoltaic cell and a first combined film structure, wherein the first combined film structure is located on the back surface of the photovoltaic cell, the first combined film structure comprises a plurality of transparent film layers, and at least two first reflection interfaces are formed on the plurality of transparent film layers; the ultraviolet light is reflected from the two first reflection interfaces to form the first reflection light and the second reflection light which deviate from the photovoltaic cell, and the first reflection light and the second reflection light can interfere with each other in a constructive manner, so that the reflection of the ultraviolet light is selectively improved. The first combined film structure provided by the invention is good in ultraviolet resistance and low in cost. Therefore, the photovoltaic module using the first combined film structure is good in ultraviolet resistance, low in cost, good in flexibility and wide in application range, and can be applied to automobiles, ships, color steel tile roofs, building curtain walls and the like.
Owner:INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
Isoindole bora fluorescent dye and its preparation method and application
ActiveCN106947469BEasy to prepareRaw materials are easy to getMethine/polymethine dyesGroup 3/13 element organic compoundsQuantum yieldFluorochrome Dye
Owner:ANHUI NORMAL UNIV
A kind of coated aluminum powder and its preparation method and coating containing coated aluminum powder
ActiveCN113388272BImprove mechanical propertiesImprove adaptabilityPigment treatment with organosilicon compoundsCamouflage paintsMalachite greenXylylene
Owner:上海戎科特种装备有限公司
Production method of solar energy optical-thermal conversion material
InactiveCN100503884CDarkness deepStrong dirt abilityHeat-exchange elementsMetallic material coating processesUltravioletPhotothermal conversion
The invention discloses a production method of a solar photothermal conversion material. The solar photothermal conversion materials produced by the prior art have defects such as poor thermal stability, UV resistance, corrosion resistance, small lighting area, and inability to realize the integration of solar thermal utilization systems and building structures. The present invention adopts chromium alloy steel as the matrix, and then performs pretreatment on it; the pretreated chromium alloy steel is subjected to chemical polishing treatment; the polished chromium alloy steel is subjected to chemical oxidation and coloring treatment, and the used chemical coloring solution includes sulfuric acid, Nitrate, ammonium sulfate and hydroxybenzoic acid; the chromium alloy steel with a black conversion film on the surface obtained in the previous step is chemically sealed; the finished product is dried. The invention uses low chromium alloy steel for acidic chemical coloring to obtain a novel solar light-to-heat conversion material, is suitable for producing large-area solar light-to-heat conversion materials, and can realize the integration of solar heat utilization systems and building structures.
Film ultraviolet detector and preparation method thereof
ActiveCN112490309AIncrease the areaGood spectral selectivityFinal product manufactureSemiconductor devicesUltraviolet detectorsThin membrane
The invention provides a BaTiO3 thin film ultraviolet detector and a preparation method thereof, and particularly relates to a BaTiO3 thin film with a forbidden band width of 3.9-4.4 eV. The detectorcomprises a substrate, a BaTiO3 film growing on the upper surface of the substrate, and an interdigital electrode layer compounded on the BaTiO3 film, the forbidden band width of the BaTiO3 thin filmis 3.9 to 4.4 eV; the grain size of the BaTiO3 thin film ranges from 0.01 nm to 30 nm; the thickness of the BaTiO3 thin film ranges from 50 nm to 500 nm; and the light absorption cut-off edge of the BaTiO3 thin film is 280 to 320 nm. The BaTiO3 film prepared by the method has the characteristics of small grain size, wide energy gap, absorption cutoff edge of 280-320 nm and the like, so that the detection wavelength corresponding to a BaTiO3 ultraviolet detector is 280-320 nm, the BaTiO3 film is an excellent UVB photoelectric detection material, detection of BaTiO3 to the UVB waveband is realized, and application of the BaTiO3 film in the field of UVB ultraviolet detectors is broadened.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Preparation method of solar selective absorbing coating with double-texture surface and coating
ActiveCN114635105ANovel structurePromote absorptionVacuum evaporation coatingSputtering coatingAnti-reflective coatingAlloy
The invention provides a preparation method of a solar selective absorbing coating with a double-texture surface and the coating. The preparation method comprises the following steps: preparing magnetron sputtering equipment, placing a sputtering target material, an arc power supply, a turntable and a substrate, vacuumizing and heating; high-purity Ar gas is introduced, negative bias voltage of the substrate is set, an arc power source is turned on, and the required texture surface is etched on the surface of the substrate through Ar under the action of the arc power source; depositing a multi-layer absorbing coating: turning off an arc power supply, rotating a turntable to enable the substrate on the turntable to be parallel to the sputtering target material, turning on a radio frequency power supply, setting parameters, simultaneously introducing high-purity Ar gas and oxygen into the chamber, sequentially setting different O2 / Ar ratios, sputtering substances of the sputtering target material, and depositing the substances on the substrate to form the gradient multi-layer absorbing coating; depositing an alloy oxide or pure metal oxide anti-reflection coating; etching a secondary texturing morphology on the surface of the anti-reflection layer through the Ar < + > ion beam; and finishing the preparation of the coating. The absorption performance and the high-temperature stability of the prepared coating are greatly improved.
Owner:WUHAN UNIV
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