81results about How to "Wide absorption band" patented technology

The invention relates to a preparation method for wave-absorbing foam concrete. The preparation method comprises the following step of mixing cement, a physical foaming agent, a wave absorbing agent, a polycarboxylic-acid high-efficiency water reducing agent and water. The preparation method is characterized in that the wave absorbing agent is metal powder, ferrite, fiber, carbon black, crystal whisker or carbon nano tube, wherein the wave absorbing agent and water are mixed according to the mass ratio of 1-40:60-100. The wave-absorbing foam concrete is prepared by premixing the wave absorbing agent by an internal mixing method, mixing uniformly, adding foam and stirring, casting and molding and curing. The wave-absorbing foam concrete has the characteristics of simple molding process, low material density and good wave-absorbing performance.

The invention provides a zinc oxide based composite photocatalytic nano-material, which is a material with visible light catalytic activity. The material has a sea-urchin-shaped solid sphere shape or hollow sphere shape. The preparation method comprises the following two steps: (1) putting alcohol / water solution of zinc salt into a high-pressure reaction kettle, reacting at 140-180 DEG C for 1.5-9 hours, washing the product with ethanol, and drying at 60 DEG C for 2-6 hours to obtain a sea-urchin-shaped ZnO microsphere; (2) performing ultrasonic dispersion on the sea-urchin-shaped ZnO in a ferric salt solution by utilizing a dipping-precipitation method, dripping ammonium hydroxide to react for 1-12 hours at 40 DEG C in a stirring condition, wherein the mass ratio of ferric salt to ZnO is 0.05-0.2; collecting solid, calcining at 350 DEG C for 2 hours to obtain an alpha-Fe2O3 nano-particle modified ZnO composite photocatalytic system. The material has strong light absorption and light response in the visible light range, can be used for remarkably improving the activity of visible light catalytic degraded organic dye, and can be applied to light catalytic degradation treatment of wastewater of the dye industry.

The invention discloses a carbon-coated metal-doped zinc oxide composite photocatalysis nano material which is a material with visible light catalysis activity. The material has appearance of a nanorod type core-shell structure. A preparation method comprises two steps of (1) putting zinc salt and a metal salt-doped alcohol-alkali solution into a high-pressure reaction kettle, performing reaction at the temperature of 120-160 DEG C for 2-12 hours, collecting solids, washing the solids with ethanol, and drying to obtain a metal-doped zinc oxide nanorod; and (2) performing ultrasonic dispersion on the metal-doped zinc oxide nanorod in water, under a condition of stirring, adding an alcoholic solution of glucose to obtain a mixture, wherein the mass ratio of metal-doped zinc oxide to glucose is (1 to 2)-(3 to 2), putting the mixture into the high-pressure reaction kettle for reacting at the temperature of 180 DEG C for 6-15 hours, collecting solids, washing the solids with ethanol, and drying a product in air. The material is relatively high in light absorption and light response in a visible light range, and the activity of visible light catalytic degradation on industrial dye wastewater can be obviously improved.

The invention relates to a carbonyl iron foam wave-absorbing material. Carbonyl iron which is large in magnetic loss, wave-absorbing strength and density is used as an absorbent to be added into a soft polyurethane foam base body, and the density and the mass of the carbonyl iron foam wave-absorbing material can be effectively reduced; the wave-absorbing performance of the material can be adjusted by changing the dipping times and the thickness of the base body, and the wave-absorbing material excellent in whole performance can be obtained. A method for manufacturing the carbonyl iron foam wave-absorbing material comprises the steps of preparing an adhesive glue solution, preparing an absorbent glue solution, dipping the soft polyurethane foam base body into the absorbent glue solution at multiple times repeatedly, removing an excess glue solution, placing the base body into a vacuum drying box to be dried, carrying out machining according to the specified dimension, and obtaining a finished product of the carbonyl iron foam wave-absorbing material. The overall wave-absorbing performance of the carbonyl iron foam wave-absorbing material is good, the surface density is low, the absorbed frequency is wide, the technology is simple and efficient, the repeatability is good, the radar wave absorbing effect is obvious, and the wide application prospect of the method in the radar camouflage field and the electromagnetic shielding field is displayed.

The invention relates to a process for synthesizing 3- or 4- carbonyl substituted coumarin connected by naphthenones and its use. The preparation process using general aldol condensation reaction comprises cyclanone and its corresponding aldehyde compounds with A1 group are added in reactor to produce semi-cyclanone with A1 group; 3- or 4- acetyl substituted coumarin with A2 group and selenious acid are added in another reactor to produce coumarin aldehyde with A2 group; said semi-cyclanone with A1 group dye reacts with coumarin aldehyde with A2 group in the presence of xylene and ethanol mixed solvent to form 3- or 4- carbonyl substituted coumarin connected by naphthenones. The product can be used for visible light polymerization of olefine monomer in photosensitized initiation system and used as photo curing materials, etc.

The invention belongs to the technical field of microwave absorbing materials, and relates to a carbon-nano-tube composite microwave absorbing material and a preparation method thereof. According to the material, a catalyst is dissolved in a liquid carbon source containing an additive to prepare a precursor solution, then, a pressureless sintering method is adopted to prepare the composite microwave absorbing material of which matrixes are carbon nano tubes, iron particles and cobalt-nickel alloy particles are added in the inner walls of the carbon nano tubes, and rare-earth compounds are attached to the outer walls of the carbon nano tubes; the liquid carbon source is a 1,2-dichloroethane solution, the additive is lanthanum nitrate, and ethyl alcohol which promotes the dissolution of lanthanum nitrate is further added in the liquid carbon source; the volume ratio of the 1,2-dichloroethane solution to ethyl alcohol is 9:1, and the catalyst contains 33.93 wt.% of ferrocene, 33.19 wt.% of cobaltocene and 32.88 wt.% of nickelocene. The carbon-nano-tube composite microwave absorbing material has the advantages of being light in weight, wide in absorption frequency band, extremely improved in microwave absorbing performance, high in environmental corrosion resistance and wide in application range; carbon-nano-tube filler prepared by the preparation method is high in purity and few in impurity.

The invention relates to a preparation method of high iron slag power doped wave-absorbing foam concrete, wherein the preparation method comprises the step of mixing cement, a physical foaming agent, an addition agent, microfiber, a polycarboxylic acid efficient water reducing agent and water. The preparation method is characterized in that the addition agent is high iron slag power, wherein the high iron slag power and cement are mixed according to the mass ratio of (10-40):(60-90). The adopted material for preparing the foam concrete comprises the high iron slag power which belongs to byproducts in the steel smelting process, wherein the high iron slag power contains a great amount of ferric oxide components, has the properties of magnetism loss and dielectric loss, and can act as a wave-absorbing agent of a cheap building material; and the high iron slag power has wide sources, is low in price, can turn waste into wealth when being used as the building material, and achieves the aim of energy conservation and environment friendliness.

The invention discloses a method for preparing glucosyl mesoporous carbon-coated ZnFeO used for electromagnetic wave absorbing coating, which belongs to the preparation process of the electromagnetic wave absorbing coating. In the method, a carbon-coated layer is formed on the surface of Zn ferrite by combining a solvothermal method and high-temperature calcination, which cannot only improve the monodispersion and stability of the ferrite and reduce the density of the ferrite, but also increase the effective absorption of electromagnetic wave, be favorable for expanding absorbing frequency range and fulfill the aims of 'thinness, lightness, wideness and rigidness'. The method is widely used for civil and military use and is more practical.

The invention relates to a method for preparing a C-SiO2-Fe / M magnetic mesoporous composite material for an electromagnetic wave adsorption coating and belongs to the method for preparing the electromagnetic wave adsorption coating. In the method, magnetic metals are introduced into an ordered mesoporous carbon-silicon oxide compound by combining a solvent evaporation induced self-assembly method with in-situ carbothermic reduction technology, wherein triblock copolymer F127 serves as a structure directing agent; furfuryl alcohol serves as a carbon source; TEOS serves as a silicon source, ferric chloride and M salt serve as metal sources. Metal ions are reduced into metal particles in the carbonation process and the metal particles are highly dispersed in a carbon matrix, so that the ordered mesoporous structure of the compound does not be damaged. Therefore, in the preparation method, the operation of inducing the magnetic components and forming holes can be simultaneously completed, effective adsorption of the electromagnetic wave is ensured, the adsorption frequency range is convenient to expand, the aim of the 'thin, light, wide and strong' composite material is fulfilled, and the method can be widely applied to civilian and military and is more practical.

The invention relates to a preparation method of a light bandwidth wave-absorbing material. A substrate of the light bandwidth wave-absorbing material is soft spongy polyurethane, and then absorbing agents, adhesives and coupling agents are added; the adhesives are dissolved in absolute ethyl alcohol and sufficiently stirred until transparent uniform adhesive liquid cement is obtained through dissolving; the absorbing agents and the appropriate quantity of coupling agents are added to the adhesive liquid cement to obtain absorbing agent liquid cement; the soft spongy polyurethane substrate is dipped in the absorbing agent liquid cement and then is repeatedly lifted and dipped, surplus liquid cement is finally discharged, the dipped substrate is placed in a vacuum drying oven to be dried and is machined according to a specified dimension, and a finished product is obtained. According to the method, processes are simple and efficient, repeatability is good, different wave-absorbing properties can be achieved by changing the liquid cement ratio, the quantity of the absorbing agents, the number of dipping times and the dipping thickness, overall performance is good, surface density is low, and the absorbing frequency band is wide. The light bandwidth wave-absorbing material has an obvious radar wave absorbing effect and has wide application prospects in the radar wave hiding field and the electromagnetic shielding field.

The invention provides an air cleaning agent containing a catalytic agent, and relates to the technical field of environment-friendly material air cleaning. In order to solve the technical problems that an existing air cleaning agent containing a photocatalyst on the market has a single function and poor in weather fastness, cannot achieve purification or freshness for a long time, and is low in cleaning efficiency, the air cleaning agent containing the catalytic agent is prepared, the air cleaning agent adopts the catalytic agent as a main purification object, natural plant components and other auxiliaries are adopted, the air cleaning agent is prepared through the reasonable proportion, use is safe and convenient, the performance of the components are brought into full play and utilized,photocatalyst particles have the good weather fastness and can have the maximum purification effect in actual application, formaldehyde and other hazardous gas in air can be effectively removed, andthe deodorization, sterilization and anti-fouling performance can be achieved.

The invention discloses a multi-resonance absorption zirconium-doped barium ferrite broadband wave-absorbing material having an expression formula of xBaZr[n]Fe[12-n]O[19]+(1-x)BaZr[m]Fe[12-m]O[19], wherein x is 0.1-0.9, n is 0.1-0.2, m is 0.3-0.5, and m is not equal to n. A preparation process comprises the steps: preparing a BaZr[n]Fe[12-n]O[19] powder; preparing a BaZr[m]Fe[12-m]O[19] powder; and then mixing and grinding the BaZr[n]Fe[12-n]O[19] powder and the BaZr[m]Fe[12-m]O[19] powder. A composite system is formed by the materials having different intrinsic parameter peak values, intrinsic parameters in the formed wave-absorbing system have corresponding different characteristic resonance frequencies, the appearing range of the resonance frequency of the composite material is greater than the appearing ranges of the own resonance frequencies of the compositing single-phase materials. The wave-absorbing material can be widely applied to the corresponding electromagnetic protection and microwave stealth fields.

The invention provides a PET / blast furnace slag composite cement-based wave-absorbing material and a preparation method thereof, belonging to the field of cross technology of electromagnetism and material science. The PET / blast furnace slag composite cement-based wave-absorbing material is prepared from the following raw materials: PET fragments, blast furnace slag, a wave-absorbing agent, polypropylene fiber, cement and water. The PET / blast furnace slag composite cement-based wave-absorbing material provided by the invention meets requirements on mechanical properties in engineering application, and has good electromagnetic wave absorption properties in a range of 2 to 18 GHz, a wide absorption frequency range, minimal reflectivity of -30 dB or below and a bandwidth of 12 GHz or above when reflectivity is -8 dB or below; and the prepared wave-absorbing material is low in density and thickness, high in strength, low in cost and simple in construction process.

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a low-reflectivity wave-absorbing material and a preparation method thereof. According to the preparation method, carbonyl iron is added into a bluing oxidizing agent aqueous solution, an obtained mixture is stirred for a reaction and then dried for use; 3-aminopropyltriethoxysilane is added intoabsolute ethyl alcohol, carbonyl iron oxide powder is added into deionized water at the same time, ultrasonic oscillation is carried out to form carbonyl iron turbid liquid; the carbonyl iron turbid liquid is added into an ethanol solution of the 3-aminopropyltriethoxysilane, and an obtained mixture is dried for later use after a reaction is finished; an adhesive is added into absolute ethyl alcohol, full stirring until is performed an obtained mixture is transparent; and silicon dioxide coated carbonyl oxide iron powder and a coupling agent are added into an ethanol solution of the adhesive;an absorbent glue solution is arranged in a drying oven so as to be subjected to moisture drying; a block body is taken out so as to be ground into powder, and the powder is put into a hot pressing mold, and therefore, the low-reflectivity wave-absorbing material can be obtained. Defects in the prior art are overcome; the process is simple and efficient; the low-reflectivity wave-absorbing material is good in repeatability and obvious in radar wave absorption effect.

The invention discloses a photovoltaic device in a double-absorption-layer PIN structure and a manufacture method thereof. Two types of materials of V and Ga with different band gap widths are added into heterojunction, TiO2(1.6eV) and Cu2O(2.0eV) serve as a light double-absorption layer, an absorbing band for generating a photon-generated carrier is expanded, and a principle limit of a single-stage cell is broken. The structure of the photovoltaic device is that a metal and a transparent conducting thin film serve as a bottom electrode of the device, niobium mixed with titanium dioxide serves as an N-type layer of the device, vanadium and gallium jointly mixed with the titanium dioxide are arranged on the N-type layer to serve as a light absorbing layer of the device, the Cu2O serves as a P-type layer of the device and also an absorption layer of the device, and metals of Pt and the like serve as anode of the cell. According to the photovoltaic device in double-absorption-layer PIN structure and the manufacture method of the photovoltaic device, an N-type heavy mixing layer Nb of TiO2 is design, height of a self-established electric field is increased, open-circuit voltage is increased, and theoretical conversion efficiency of device performance is as high as 34%. The design of the three-layer PIN structure comprising the double absorption layers enables light absorption range to cover visible light and a near infrared area, sunlight is effectively absorbed, and conversion efficiency of a thin-film solar cell is greatly improved.

An asymmetric compound taking triphenylamine as nucleus and containing benzophenone fragment and a synthesis and an application thereof, belonging to the field of organic dye, in particular relating to the application of the asymmetric compound taking triphenylamine as nucleus and containing benzophenone fragment in photopolymerization. The general formula of the typical chemical structure is shown in formula (I), wherein compound in molecular structural formula (I) represents A: R1, R2: H, R3: CH3, OCH3, OCH2CH3, OCH2CH2CH3, OCH2CH2CH2CH3, N(CH3)2, N(CH2CH3)2, N(CH2CH2CH3)2, N(CH2CH2CH2CH3)2, CN, F, NO2; B: (R1, R2,:, R3: OCH3). 4-diethyl benzophenone phosphonate and derivative containing 4-aldehydegroup-triphenylamine compound react in a glass vessel under the alkaline condition to prepare the asymmetric non-conjugated compound taking triphenylamine as nucleus and containing benzophenone fragment, the absorption maximum thereof is at visible region, the organic dye can be used as light trigger to form a photosensitive system together with auxiliary agent trolamine to be used for visible light polymerization of alkene monomer in solution or to be used as photocuring material.

The invention discloses a GaAs unijunction solar cell. An electrode and a double-layer antireflection film are formed on the surface of an epitaxial layer of the cell; and an upper film of the double-layer antireflection film is made of a material with a refractive index smaller than that of a lower film, while the lower film is made of a photoluminescence material with a refractive index between the refractive indexes of the upper film and a window layer. The photoluminescence material can absorb the sunlight of a wave band which cannot be absorbed by GaAs and convert the part of sunlight into light which can be absorbed by the GaAs so that the sunlight of the wider wave band is absorbed by the GaAs solar cell and converted into electrical energy, the absorption wave band of the GaAs unijunction solar cell on the sunlight is greatly broadened and the photoelectric conversion efficiency of the cell is improved.

The invention provides a broadband terahertz wave absorber of three dart-shaped graphene. The wave absorber is composed of a plurality of wave absorbing units, and the main structure of the wave absorber comprises a bottom metal plate (1), a silicon dioxide dielectric layer (2) and a three-dart-shaped graphene layer (3). The broadband wave absorber with good absorption performance on terahertz waves is formed through interaction between the multiple layers of graphene and the dielectric layer, voltage can be applied to the wave absorber to change Fermi level of the graphene layer, and absorption frequency adjustability is realized. The broadband terahertz wave absorber has the advantages of insensitive polarization, good absorption effect and the like, the bandwidth with the absorption efficiency of more than 90% reaches about 2.2 THz, and the application prospect is very wide.

The invention discloses a preparation method of a textile material for photo-thermal sea water desalination. The preparation method includes the steps: A preparing 10-25g / L graphene oxide dispersion liquid to serve as printing paste, and performing single-side printing on a polypropylene needling non-woven fabric; B soaking and rolling the non-woven fabric in crosslinking finishing fluid twice, and pre-drying the non-woven fabric at the temperature of 80-100 DEG C to obtain a graphene oxide printing polypropylene fabric; C soaking the graphene oxide printing polypropylene fabric into reductionfinishing fluid; D taking out the soaked polypropylene fabric, washing the polypropylene fabric by deionized water, and drying the polypropylene fabric to obtain the textile material for photo-thermal sea water desalination. According to the method, stable and low-cost non-woven materials serve as a thermal insulating layer and a water channel, solar energy is effectively utilized, and water is sufficiently supplied for the surface of a photo-thermal material. The prepared photo-thermal conversion material is high in evaporation efficiency, any electric drive is omitted by the aid of solar drive, and cost performance is high. The method is simple to operate, low in cost, green and environmentally friendly, mass production can be achieved, and functional application of a textile is widened.

The invention relates to a benzophenone fragment and p-nitrodiphenylethene fragment-containing tree like visible light photoinitiator and synthesis and application thereof, belonging to the field of photoinitiators. The tree like visible light photoinitiator comprises the typical chemical structural general formulae shown in the description, wherein n1 and n2 in molecular structural formulae (I) and (II) represent 1-6, wherein in the molecular structural formula (I), the (I) is prepared through reacting 4-(4'-bromohydrocarbylstyyl) nitrobenzene with 3,5-dihydroxylbenzyl alcohol to obtain a product of 3,5-di((4'-nitrobenzenevinyl)benzene alkoxide)benzyl alcohol, and then reacting the 3,5-di((4'-nitrobenzenevinyl)benzene alkoxide)benzyl alcohol with 4-bromomethylbenzophenone under alkaline conditions; and in the molecular structural formula (II), the (II) is prepared through reacting 4-bromohydrocarbylbenzophenone with 3,5-dihydroxylbenzyl alcohol to obtain a product of 3,5-di((4'-benzoyl)benzene alkoxide)benzyl alcohol, and then reacting the 3,5-di((4'-benzoyl)benzene alkoxide)benzyl alcohol with 4-(4'-hydroxylstyryl)nitrobenzene under alkaline conditions. The benzophenone fragment and p-nitrodiphenylethene fragment-containing tree like visible light photoinitiator has the maximum absorption in a visible light region and can be used as the photoinitiator to form a photosensitive system together with a triethanolamine auxiliary agent and used for visible light polymerization of alkene monomers in a solution or used as photocuring materials.

The invention relates to a black absorbent coating. The coating comprises an infrared reflection layer, a blocking layer, a graphene material absorbing layer, an auxiliary absorbing layer and an antireflection layer in the light incident negative direction, the blocking layer is nickel oxide, and the auxiliary absorbing layer is chromium sesquioxide. The black absorbent coating has the beneficialeffects that the absorbing waveband is wider, the light utilization rate is higher, the solar-thermal conversion efficiency is higher, smoke resistance is good, and attaching force is high; secondly,the solar-thermal conversion efficiency of the solar-thermal conversion component with the black absorbent coating can reach 92 to 98%.

The invention discloses a dye sensitizer molecule taking triazole as a core and a preparation method of the dye sensitizer molecule. According to the dye molecule, a triazole ring is introduced to the design of a molecular structure, and the electronic absorption and transmission capability among D-pi-A dye molecules are greatly improved by substituting donors with different carbon chain lengths and receptors with triple bonds at the periphery, so that a novel triazole dye with high efficiency is obtained. The preparation method of the compound comprises: click chemical reaction, detrimethylsilyl reaction, Sonogashira coupling reaction and the like; and the prepared dye molecule can be applied to a dye-sensitive solar cell and can show favorable photoelectric conversion property so as to have wide application prospects on the aspects of energy development and utilization. In addition, the material also has liquid crystal property under a certain condition so as to also have a huge potential on the aspect of application to photoelectric devices.

The invention provides a method for manufacturing high-silica glass emitting white light. The method comprises the following steps of: firstly, soaking porous glass into a mixed solution containing doped ions, wherein the doped ions comprise cerium ions, terbium ions, manganese ions and other metal ions, and the mixed solution has the cerium ion concentration of 0.08-0.3mol / L, the terbium ion concentration of 0.15-0.5mol / L, the manganese ion concentration of 0.2-0.7mol / L and the concentration of other metal ions of 0.2-2.5mol / L; then drying the soaked porous glass; and finally, arranging the porous glass into a nonoxidative atmosphere and sintering at 1,050-1,200 DEG C to obtain the high-silica glass emitting white light. The absorption waveband of the glass manufactured according to the method can be expanded to a blue and violet light area, and a blue and violet light LED based on an InGaN material can be used as a mercury-free excitation source which is harmless to human bodies andenvironment to excite the glass to emit white light.

The present invention relates to a class of asymmetrical dye molecules adopting tetraphenylporphin as the core, and a preparation method thereof. According to the structure of the dye molecule, donors with different carbon chain lengths and an acceptor with a triple bond are asymmetrically substituted on the periphery of the structure, and a proper core metal ion is selected to enhance the electron absorption ability and the electron donating ability. The preparation method comprises an Adler synthesis method for synthesis of 4-4-bromophenyl porphyrin and subsequent substitution reactions of the donor and the acceptor. The prepared dye molecules can be applicable for the DSCC, can provide good photoelectric conversion properties, and have great application prospects in energy development and utilization. The materials of the present invention have the liquid crystal properties under a certain conditions, such that the materials can form the discotic liquid crystals, and have great application potential in the application fields of photoelectric devices.

The invention relates to p-nitro stilbene dye with benzophenone via ether bond and the method of synthesis and application, in particular to the synthesis of p-nitro stilbenes dye connected with benzophenone via ether bond and the application under photopolymerization, belonging to the technical field of organic dye. The typical chemical structure is like the right equation (I). 4-bromonethyl benzophenone and the derivatives of p nitro stilbene compound with hydroxyl react in a glass vessel and in alkaline condition. The p nitro stilbenes dye with benzophenone is produced via ether bond, and the maximum absorption is in visible region. The invention can be used as photoinitiator combined with the promoter triethanolamine to form a photosensitive system, which is used as visible light polymerization of vinyl monomer in solution or solidifying material.

The invention discloses a cross-linked polyethylene insulated anti-interference shielding naval vessel cable and a preparation method thereof, a shielding material is prepared in the process of preparing the anti-interference shielding naval vessel cable, the shielding material contains a large number of high-resistance metal objects, and the high resistivity enables electromagnetic waves to easily enter and rapidly attenuate; and the obtained cable can still keep high magnetic conductivity at high frequency. The graphene, the carbon nano tube and the copper have excellent conductivity, so that the shielding carrier has electrical loss and magnetic loss at the same time, impedance matching of electromagnetic absorption is achieved, the absorption frequency band is widened, the anti-interference performance is improved, oxygen-containing acid of phosphorus can be generated in the combustion process. Phosphorus oxyacid catalyzes a hydroxyl-containing compound to be dehydrated into carbon, then a coke layer is generated on the surface of the thermal insulation material, and the coke layer can isolate oxygen and heat to extinguish flame, so that the flame retardance of the cable is further improved.

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a carbonaceous material high-temperature wave-absorbing composite material and a preparation method thereof. The preparation method comprises the following steps of: adding PVP into a ferrous sulfate aqueous solution, stirring and dissolving, rapidly pouring a sodium borohydride aqueous solution,continuously stirring, separating out ferrite, and washing for later use; performing polymerization reaction on acrylonitrile, itaconic acid, an initiator and an organic solvent under a constant-temperature condition to obtain a polymerization mixed solution; adding the ferrite into the polymerization mixed solution, stirring and reacting under a constant-temperature water bath condition, adding adispersing agent and graphene micro powder, and dispersing at a high speed to obtain a composite precursor solution; preparing the composite precursor solution into blended fibers by utilizing wet spinning equipment; and pre-oxidizing the blended fibers, heating to 800 DEG C for roasting, and cooling to room temperature to obtain the wave-absorbing composite material. The defects in the prior artare overcome, and the wave-absorbing composite material with wide absorption frequency band, high absorption strength and high temperature resistance is provided.

The invention discloses a visible light-near infrared band solid state photocatalytic purifying film apparatus which comprises a substrate, a semiconductor and a metal. The metal and the semiconductor are in contact and are in contact with air and form a metal-semiconductor compound micro-nano structure; and the metal-semiconductor compound micro-nano structure is located on the substrate. Compared with a conventional photocatalytic purifying device based on wide band-gap semiconductor nanoparticles, the visible light-near infrared band solid state photocatalytic purifying film apparatus disclosed by the invention based on the metal-semiconductor compound micro-nano structure can expand a catalytic response band to a visible light-infrared band, so that the utilization efficiency of light sources such as sunlight and an indoor fluorescent lamp can be greatly increased; moreover, the visible light-near infrared band solid state photocatalytic purifying film apparatus is free of loss and secondary pollution, so that the visible light-near infrared band solid state photocatalytic purifying film apparatus is more stable, safe and environmental-friendly.

The invention discloses a two-dimensional photonic crystal composite structure enhancing broad spectrum light absorption. The composite structure is formed by compositing an absorption layer and a reflective layer. The absorption layer is in a photonic crystal structure, wherein the structure is formed by arranging a two-dimensional periodic inverted pyramid-shaped groove in the upper end face of a non-metallic material Si, and the inverted pyramid-shaped groove is filled with a polymeric film or a colloidal quantum dot film. According to the reflective layer, random pyramid grooves are arrnaged in x and y directions in the bottom end face of the non-metallic material Si, and the surface of the bottom end face is coated by a metal material Au. According to the composite structure, the absorption of p-polarized and s-polarized incident lights from ultraviolet to infrared band, and even efficient, broadband and wide-angle electromagnetic waves of a wider band is enhanced, and is beyond the Yablonovitch limit in infrared band; an electric field in the inverted pyramid-shaped groove on the surface of the absorption layer and an electric field in a cavity formed by the inverted pyramid on the surface of the absorption layer and the reflective layer are significantly enhanced; and the composite structure in particular has a great application prospect in solar cells, photodetectors, military stealth and other aspects.