175results about How to "Broaden the response range" patented technology

The invention discloses a graphene, silver phosphate and titanium dioxide dual-functional composite and a method for preparing the same, and belongs to fields of photocatalysis technology, biological antibiosis and water pollution control. The method includes steps of ultrasonically treating oxidized graphene in water to obtain oxidized graphene dispersion liquid; dissolving silver phosphate in deionized water, adding the deionized water with the silver phosphate into the oxidized graphene dispersion liquid under the condition of stirring, and then stirring the oxidized graphene dispersion liquid to obtain mixed solution A; ultrasonically dispersing P25 in deionized water to prepare dispersion liquid, dripping the P25 dispersion liquid into the mixed solution A under the condition of magnetic stirring, and then stirring the mixed solution A to obtain mixed precursor solution B; and dripping phosphate solution into the mixed precursor solution B, then continuing stirring the mixed precursor solution B, shifting the mixed precursor solution B into a hydrothermal reaction kettle to enable the mixed precursor solution B to react so as to obtain a product, cooling the product to the room temperature, centrifuging the product, then washing the product and performing vacuum drying for the product to obtain the composite. The prepared composite not only can quickly degrade organic pollutants with certain concentration when irradiated by visible light, but also has broad-spectrum and efficient bactericidal activity for various bacteria.

A preparation method of a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material includes: (1) etching Ti₃AlC2 with LiF/HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material. A method for degrading and removing organic pollutants in water includes (1) etching Ti₃AlC₂ with LiF/HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material; (4) placing the two-dimensional nitrogen-doped carbon-based titanium dioxide composite material into water containing organic pollutants to degrade and remove organic pollutants in water.

The invention relates to a silver-modified carbon nitride composite photocatalytic material and a preparation method thereof. The preparation method comprises: dissolving dicyanodiamide or melamine in deionized water or dimethyl sulfoxide and performing ultrasonic dispersing, so as to obtain a dicyanodiamide or melamine dispersion liquid; dissolving silver nitrate in deionized water and stirring uniformly, so as to obtain a silver nitrate solution; slowly dropwise adding the silver nitrate solution into the above dicyanodiamide or melamine dispersion liquid under the condition of magnetic stirring, and continuing stirring the solution, so as to obtain a mixed precursor solution; using anhydrous ethanol and deionized water repeatedly wash the obtained mixed precursor solution for multiple times, and performing vacuum drying; and putting the obtained product in a proper crucible and covering, putting in a high-temperature furnace, and sintering for a period under the condition of nitrogen protection, so as to obtain a powdery sample. The advantages comprise that the raw material source is wide, the preparation technology is simple and practicable, and the cost is relatively low; and the prepared composite photocatalytic material has relatively good photocatalytic degradation effect on organic dye rhodamine B under irradiation of visible light.

In order to increase the spectral response range and improve the mobility of the photo-generated carriers (e.g. in an nBn photodetector), a digital alloy absorber may be employed by embedding one (or fraction thereof) to several monolayers of a semiconductor material (insert layers) periodically into a different host semiconductor material of the absorber layer. The semiconductor material of the insert layer and the host semiconductor materials may have lattice constants that are substantially mismatched. For example, this may performed by periodically embedding monolayers of InSb into an InAsSb host as the absorption region to extend the cutoff wavelength of InAsSb photodetectors, such as InAsSb based nBn devices. The described technique allows for simultaneous control of alloy composition and net strain, which are both key parameters for the photodetector operation.

The invention discloses a combined sensor applied to measurement of a water ratio in an oil well and mainly solves the problem that the measurement resolution of common sensors for the water ratio is reduced under the condition of low-flow oil-water stratified flows in the prior art. The combined sensor applied to the measurement of the water ratio in the oil well is characterized in that: an electrode rod of a coaxial capacitance sensor is embedded at the central position of a tubular capacitance sensor; the electrode rod consists of an inserted electrode bar and an insulating layer coated outside thereof; the inserted electrode bar in the electrode rod is connected in parallel with a metal tubular electrode; the two electrodes are subjected to sealing treatment to insulate from a shell, and leads of the two electrodes are led out to connect the same exciter in a parallel connection mode on a circuit; and the metal shell serves as a grounding terminal. Compared with the conventional tubular sensors and coaxial capacitance measurement sensors, the combined sensor has wider response range when the oil water stratified flows flow in the sensor; under the condition of no stratified flows, the structure of the combined sensor increases an effective area in contact with oil bubbles, and limits the range of activity of the oil bubbles, thereby improving the measurement resolution.

The invention discloses an intelligent coffer and a controlling method thereof. The intelligent coffer comprises a coffer body and is characterized in that the coffer body is provided with an antitheft controlling system; the controlling system consists of a power supply module, a display module, a communication module, a keyboard input module, an emergency lock, a microprocessor and a sensor set which are connected with each circuit module; the input end of the microprocessor is connected with the keyboard input module and the sensor set; the output end of the microprocessor and the display module are connected with the communication module through an interface circuit; and an output signal of the emergency lock is connected with the input end of the microprocessor. As the structure and the controlling method are adopted, if the coffer is knocked, moved and put down or a cipher is continuously input for three times by error or other illegal actions, the coffer sends an emergent warning short-message to a user through GSM network to enlarge the response range of automatic warning and strengthen the safety coefficient of the coffer. The intelligent coffer and the controlling method adopt a Chinese short-message form and directly reflect the situation detected by the sensor set to a screen of a mobile phone.

The invention relates to a nanometer complex phase photochromic material and its preparation method. The material comprises polyurethane and a core-shell structured WO3, ZnO and ZnS nano-material. Specifically, the inner core of the nano-material is WO3, ZnO or ZnS nanoparticles with a particle size of 10-50nm. The shell of the nano-material is a surface dressing agent or also called surface modifier, and has thickness of 3-10nm. The nano-material accounts for 0.5%-6% of the total weight of the nanometer complex phase photochromic material. The photochromic material provided in the invention not only changes color under ultraviolet light radiation, but also can change color under visible light, and the color change process has the advantages of short color change time, high response sensitivity, long cycle life, abundant color change and the like.

Catalytic pyrolysis can upcycle waste, e.g., car bumpers, to carbon nanomaterials, preferably using synthetic TiO₂ nanoparticles as catalyst during pyrolysis. Analysis of the carbon nanomaterials shows that, while RGO is produced from thermal pyrolysis of car bumper waste absent TiO₂, RGO spotted with carbon dots is produced in presence of TiO₂ catalyst. Rutile to anatase TiO₂ phase transformation and carbon nanomaterial formation can simultaneously occur during the pyrolysis. Anatase to rutile transformation may occur while TiO₂ absent the bumper material. Such TiO₂-CD-RGO can be used, for example in photocatalytic degradation of organic compounds, such as methylene blue.

The present invention discloses a cobalt oxide doped basic bismuth carbonate/bismuth oxychloride photocatalyst, which comprises, by weight, 55-90% of basic bismuth carbonate (Bi2O2CO3) and 10-45% of bismuth oxychloride (BiOCl). The preparation method comprises: (1) adding Bi2O2CO3 to a BiOCl aqueous solution, and carrying out ultrasonic dispersion for 30 min, wherein the mass of the cobalt chloride is 5-30% of the mass of the basic bismuth carbonate; and (2) carrying out heating stirring on the ultrasonic dispersion mixing solution obtained in the step at a temperature of 100 DEG C until the water is completely evaporated, grinding into powder, heating to a temperature of 350 DEG C at a rate of 5 DEG C/min, and calcining for 3 h to obtain the basic bismuth carbonate/bismuth oxychloride photocatalyst. According to the present invention, the method is simple and rapid, can improve the catalytic efficiency of the catalyst, and is suitable for industrial production, and the obtained basic bismuth carbonate/bismuth oxychloride photocatalyst can be widely used in the fields of organic pollutant degradation, photocatalytic decomposition water-to-hydrogen, and the like.

The invention provides a highly-doped multi-band excitation rare earth upconversion fluorescence nano material and a preparation method thereof, belonging to the technical field of luminescent material structural design and preparation thereof, and solving the problems that an existing upconversion fluorescence material is low in rare earth luminescence center ion doping concentration and low in luminous efficiency. The material takes NaYF4, NaGdF4 or NaLuF4 as a substrate, is doped with rare earth luminescence center ions and is in a nanocrystalline micro-structure, and a nano core structure is externally coated with an inert shell structure; the rare earth luminescence center ions are Er3<+>, and the doping concentration is 20 percent to 100 percent. The invention also provides the preparation method of the highly-doped multi-band excitation rare earth upconversion fluorescence nano material. The nano material can realize nearly monochromatic upconversion fluorescence under three excitation wavelengths of 800nm, 980nm and 1530nm, and the optimal doping concentration of the singly doped rare earth luminescence center ions Er3<+> is increased to 100 percent.

The invention relates to preparation of a composite photocatalyst, and particularly relates to a photocatalytic material which is formed by loading a P25 type nano TiO2/V2O5 composite on foamed nickel having large specific surface area and has high catalytic degradation performance. The preparation method comprises the following steps: dissolving ammonium metavanadate in water, performing wet milling together with P25, impregnating, loading onto the foamed nickel, drying, and calcining at 500 DEG C for 1 hour, thus obtaining the foamed nickel loaded V2O5/P25 photocatalytic material. According to the invention, the preparation method is simple; no expensive equipment is required; the raw materials are low in price; the mechanical performance is favorable; and the photocatalytic degradation rate and visible light response range of the prepared catalyst are greatly improved in comparison with P25. When the composite photocatalyst is used for degrading harmful gas such as formaldehyde and the like in rooms and automobiles, the problems that the powdery photocatalyst is difficult to recover and regenerate after use and the like can be avoided.

The invention relates to a method for preparing a tourmaline/titanium oxide composite sol and its purposes. The mass percentage of raw materials and feeds is listed: titanate with 5-15%, anhydrous alcohol with 60-90%, organic acid with 3-13%, inorganic acid with 2-15%, deionized water with 0.5-1.5%, tourmaline with 0.001-3%, tombarthite with 0.0004-0.0008%, the total is 100%. The said titanate is one of the kinds such as methyl titanate, ethyl titanate, butyl titanate, titanic chloride and titanoxy sulfate. The said organic acid is one of the kinds such as acetic acid, oxalic acid, formic acid and monosulfonic acid. The said inorganic acid is one of the kinds such as concentrated sulfuric acid, concentrated nitric acid and concentrated chlorhydric acid. The said tourmaline is one or more of the kinds such as iron-tourmaline, elbaite and dravite. The said tombarthite is one of the kinds such as lanthanum, europium nitrate, erbium nitrate, cerous nitrate and neodymium nitrate. The invention also provides the method for preparation of the said sol and its main purposes.

The invention discloses a preparation method of a p-n type Cu2O/TiO2 nanowire array composite film. According to the method disclosed by the invention, a TiO2 nanowire array is sensitized by using a p-type inorganic semiconductor material Cu2O, a TiO2 nanowire array film is prepared by adopting a hydrothermal method at first, then the p-n type Cu2O/TiO2 nanowire array composite film with different content of Cu2O nano particles is prepared through controlling the deposition time by adopting an electro-deposition method, and the Cu2O particles are uniformly distributed on a TiO2 nanowire. The preparation method disclosed by the invention is simple to operate, low in raw material cost and simple in equipment. In addition, the size of prepared materials is uniform, and the stability and the photoelectric performance are good.

The invention belongs to the technical field of photocatalyst materials for degrading wastewater pollutants and discloses a preparation method of a Bi2O2CO3/PPy/g-C3N4 compound photocatalyst and application of the Bi2O2CO3/PPy/g-C3N4 compound photocatalyst to Rhodamine B degradation under simulated sunlight. The preparation method includes: mixing a polypyrrole (PPy) doped bismuth subcarbonate (Bi2O2CO3) composite material with graphite-phase carbon nitride (g-C3N4) in an organic solvent according to the proportion, performing heating reflux, washing obtained products for several times, and performing vacuum drying to obtain the Bi2O2CO3/PPy/g-C3N4 compound photocatalyst material. The preparation method has the advantages that the preparation method is simple and easy to achieve large-scale industrial production, the prepared compound material is stable in property and high in photocatalytic activity, the spectral response range of Bi2O2CO3 is expanded, sunlight utilization rate is increased, and the prepared compound material has a good degrading effect on organic dye Rhodamine B of certain concentration and is applicable to dye wastewater treatment.

The invention provides a graphite-phase-like carbon nitride-(110) crystal face bismuth vanadate Z-type heterojunction photocatalyst and a preparation method and application thereof. The method comprises the following steps of 1, preparing exposed (010) crystal face BiVO4 powder and H2SO4 modified g-C3N4 powder; 2, adding the exposed (010) crystal face BiVO4 powder into water, and conducting ultraviolet illumination; dissolving the modified g-C3N4 powder into water, and conducting ultraviolet illumination; 3, adding a BiVO4 solution after ultraviolet treatment into a g-C3N4 solution which is subjected to ultraviolet illumination and negatively charged to obtain a precursor solution, and conducting ultraviolet illumination on the precursor solution to obtain g-C3N4-(110) crystal face BiVO4Z-type heterojunction photocatalyst powder. The catalyst enlarges the response range of visible light, reduces the recombination rate of electrons and hole pairs, improves the separation efficiency of charge carriers and improves the photocatalytic performance of the BiVO4-based composite photocatalyst.

The invention relates to a wide spectrum high reflectivity irregularly shaped distributed Brag reflector (IDBR) and a manufacturing method thereof. The IDBR is characterized in that: through growing m pairs of DBR (distributed Brag reflector)-A multilayer films of a centre wavelength of lambda1 (lambda1= 400-700 nm) on n pairs of DBR (distributed Brag reflector)-B multilayer films of a centre wavelength of lambda2 (lambda2= 700-1300 nm), the IDBR is formed. The DBR-A or DBR-B is formed by periodically alternative combination of amorphous silicon (or amorphous germanium-silicon alpha-Ge[x]Si[1-x], x is larger than 0 and is less than or equals to 1 ) and silicide or metal (including SN, SiO[2], Ag or Al) film, thick and thin layer thicknesses T[H] and T[L] are determined by formulas T[H]= lambda[1(2)]/(4n[H]) and T[L]= lambda[1(2)]/(4n[L]) respectively, and n[L] and n[H] represent thin and thick layer refraction coefficients respectively. The IDBR in the invention can realize a high average reflectivity of more than 89% in a wide spectrum range of a wavelength of 400nm to 1270 nm, and is suitable for an ultra-thin (less than or equals to 50 micrometers) crystal silicon solar cell and an ultra-thin film solar cell.

The invention relates to a preparation method of a nanometer titania/molybdenum disulfide composite film. The preparation method includes: respectively preparing nanometer titania solution and molybdenum disulfide of a spherical structure, subjecting the nanometer titania solution and molybdenum disulfide to polytetrafluoroethylene reaction kettle and ultrasonic treatment to obtain colloid of nanometer titania/molybdenum disulfide composite, spraying the colloid onto a roughened stainless steel wire mesh to form the nanometer titania/molybdenum disulfide composite film, and taking silver nitrate solution as electrochemical deposition electrolyte, the stainless steel wire mesh as a cathode and graphite as an anode to deposit silver nanoparticles onto the nanometer titania/molybdenum disulfide composite film to obtain the nanometer titania/molybdenum disulfide composite with the silver nanoparticles in inverse point array. The prepared nanometer titania/molybdenum disulfide composite film can be widely applied to environmental pollution treatment.

The invention relates to a broad-spectrum wide angle absorption solar cell moth-eye antireflection structure based on a monocrystalline silica substrate and a preparation method thereof, which is characterized by having the aid of the bionics principle, taking a moth-eye micro-nano structure as an antireflection layer and improving optical energy capture; the micro-nano structure is formed by taking dense monolayer silicon or a silicide particle network formed by a drawing-film (LM) method as a reticle mask; forming the micro-nano structure by adopting the dry etching process to etch monocrystalline silicon, thus preventing the defect of insufficient etching depth limit of a wet etching method; adjusting the size and density of reticle mask particles to regulate the optical refraction coefficient gradient of the adjusting moth-eye micro-nano structure so as to realize wide-angle absorption of wide incident light with 0-60 degrees; adopting the method for adjusting the size (20-800 NM), depth and periodicity of the micro-nano structure to realize optical energy absorption of infrared, visible and ultraviolet (250-2.5 NM) broadband section, thereby increasing cell efficiency.

The invention discloses a preparation method of conductive polymer polypyrrole modified TiO2 and application of the conductive polymer polypyrrole modified TiO2, and belongs to the technical field of preparation of an environmental material. The preparation method comprises the following steps of: configuring 80 mL of hydrochloric acid solution with the pH (Potential of Hydrogen) being 1-3; weighing 1.73g of TiOSO4 into 80mL of hydrochloric acid with the pH (Potential of Hydrogen) being 1-3; placing into a water-bath boiler at 5-25 DEG C to be agitated by power until the solution is classified; gradually dropping into 3.5mL of pyrrole; slowly adding 3.9mL of hydrogen peroxide with the mass concentration of 30% into a mixed solution; agitating at a constant temperature by the power for 6 hours; after the reaction is finished, washing sediment by de-ionized water and absolute ethyl alcohol for many times until the sediment is neutral; and drying a sample at 60 DEG C in vacuum for 12 hours. The preparation method has the advantages that the synthesized PPy-TiO2 is in a scale-shaped hollow pipe-shaped structure; the specific surface area and the aperture are very large; and the effective separation of photoproduction electrons and a hollow cavity can be realized, and a catalyst is protected against inactivation or reduction of catalytic activity caused by blocking.

The invention belongs to the technical field of catalysts, and discloses an MXene/titanium dioxide nanotube composite material photocatalyst, which is prepared by compounding an MXene material and a titanium dioxide nanotube. The invention also discloses a preparation method of the MXene/titanium dioxide nanotube composite material photocatalyst. The preparation method comprises two steps: preparation of an MXene material and preparation of an MXene/titanium dioxide nanotube composite material. Due to the a unique layered structure of MXene, the response range of titanium dioxide to light is expanded, and the electron-hole separation rate is increased, so that the photocatalyst generates higher photocatalytic activity under the action of visible light, and has a wide application prospect in the field of photocatalysis. The provided synthesis method has the characteristics of simple process, low energy consumption, mild conditions, good product morphology and the like, and is suitable for large-scale production and application.

The invention provides a femtosecond laser ablation-based infrared-enhanced Si-PIN detector and a preparation method thereof. The detector comprises an intrinsic silicon substrate, a femtosecond laser ablation microstructure layer, an infrared-enhanced amorphous silicon-ruthenium alloy film, a lower electrode, a P-type region, an annular P+ type region and an upper electrode, wherein the femtosecond laser ablation microstructure layer is a micron sharp cone array. The unabsorbed light which transmits through a space charge region is reflected for multiple times; a light propagation path and the photo capture ratio are increased; absorption and utilization of the light are improved; more photo-induced carriers are excited; the responsivity of the detector is improved; a relatively narrow optical band gap is obtained through controlling the ruthenium content; and the band gap of a silicon material is narrowed, so that near-infrared light with lower energy and a larger wavelength is captured; absorption of the near-infrared light can be additionally increased; and the detection spectrum range of a photoelectric detector is expanded.

An antibacterial agent including a photocatalytic antibacterial material. The photocatalytic antibacterial material includes a rare-earth element modified tetrapod-shaped zinc oxide whisker (T-ZnOw). A method for preparation of the antibacterial agent is also provided, and includes: 1) adding a tetrapod-shaped zinc oxide whisker and a dispersant into a dispersion medium, and dispersing to yield a tetrapod-shaped zinc oxide whisker dispersion system; and 2) adding a rare-earth element to the dispersion system under ultrasound conditions, stirring, performing ultrasonic vibration, filtering, washing, drying, and baking, to yield the antibacterial agent.

The invention relates to a method for manufacturing a CIGS thin-film solar cell by using a dry buffer layer. The method comprises: step 1, preparing a Mo layer on a piece of soda-lime glass; step 2, preparing a CIGS layer on the Mo layer; step 3, preparing a Zn (O,S) thin film layer on the CIGS layer by using a direct-current magnetron sputtering method; step 4, carrying out annealing processing on the prepared Zn (O,S) thin film layer in air to release the stress, thereby improving the film quality; and step 5, preparing an AZO layer on the Zn (O,S) thin film layer to form a CIGS thin-film solar cell device. According to the invention, during the preparation process, no waste liquid is generated, so that no influence on the preparation staff and the environment is caused; and the continuity of the preparation process of the CIGS cell device is improved. Because of the dry buffer layer, absorption of the blue light can be reduced effectively, the response range of the spectrum can be enlarged, and the solar cell efficiency can be enhanced.

The invention provides a g-C3N4/H-TiO2 based nano tube array as well as a manufacturing method thereof and an application thereof, and belongs to the technical field of nano composite materials. The manufacturing method comprises the following specific steps of: manufacturing a nano tube ordered array on a titanium-containing metallic matrix through an anode oxidization method; performing crystallization and surface hydrogenating treatment on the manufactured nano tube ordered array to obtain a H-TiO2 based nano tube array; and compounding the manufactured H-TiO2 based nano tube array and g-C3N4 to obtain the g-C3N4/H-TiO2 based nano tube array. The ordered nano tube array composite material is widely applied, and can be used as a photoelectrode for use; the advantages of the nano tube ordered sequence are sufficiently brought into play, so that multi-component modification is realized while the morphology and the structure of the nano tube array are not obviously improved, sunlight response range is remarkably expanded, photoelectric conversion efficiency is obviously improved, and support is provided for designing, developing and applying a high-performance photoelectrode.