526results about How to "Expand the scope of absorption" patented technology

The invention relates to a compound catalytic material for purifying harmful gas. Deionized water is used as dispersant to compound nano-catalytic material, rare earth compound, p-type semiconductor, antimicrobial, plant extract and anion powder. The compound catalytic material can fast and thoroughly eliminate free formaldehyde, benzene homologue, ammonia and TVOC harmful gas. The compound catalytic material does not require ultraviolet light, has simple use and low cost and does not have toxic side effect and secondary pollution, and the purification effect can last for more than five years without rebound. At the same time, the compound catalytic material prevents bacteria, germina and mildew from invading human body, removes peculiar smell, odor, smoke, leather flavour, paint flavour and the like, increases anion and far infrared ray which are beneficial to human body and improves indoor air environmental quality comprehensively. The experiment detection shows that formaldehyde clearance rate within 24 hours is 91.6 percent; benzene clearance rate is 88.9 percent; ammonia clearance rate is 90.5 percent; TVOC clearance rate is 87.6 percent; sterilization and bacteriostasis rate is 99.99 percent; mould prevention is 0 grade; and acute oral toxicity is tested as actually nontoxic class.

The invention discloses an environmental function nano-material-Cu2O / TiO2 nanotube array and a preparation method thereof. A TiO2 nanotube array is placed in 5mmol-20mmol of CuSO4 solution, and copper is electrodeposited on the TiO2 nanotube array in a standard three-electrode system by using pulse plating so as to obtain the Cu / TiO2 composite nanotube array; and after the deposition, the Cu / TiO2 composite nanotube array is electro-oxidized for certain time in an alkaline solution NaOH to obtain a TiO2 nanotube array modified by ultrafine Cu2O nanowires with the diameter of less than 5 nanometers. The nanaowires are intertwined and connected to from a network structure to be attached to the TiO2 nanotube array but do not fully block TiO2 nanotubes; the Cu2O / TiO2 nanotube array is very favorable for the transmission of photo-carriers, reduces the recombination probability of electron-hole pairs, effectively expands the absorption range of TiO2 in the visible region, reduces optical corrosion, improves photoelectric conversion efficiency, and shows good photocatalytic efficiency.

The invention discloses a preparation method of precious metal loaded Bi2WO6 visible light photocatalyst, which is mainly characterized in that the photo-induced electrons and positive holes of the Bi2WO6 photocatalyst are easy to be re-combined to reduce the photocatalytic activity thereof, and a precious metal is loaded on the surface of the Bi2WO6 photocatalyst to greatly improve the separation of the photo-induced electrons and the positive holes so as to improve the photocatalytic performance of the Bi2WO6 visible light photocatalyst. The preparation method comprises the following steps of: (1) synthesizing Bi2WO6 by a liquid phase method: firstly dissolving bismuth salt in certain amount of acetic acid, blending the solution with tungsten salt according to a metering ratio, uniformly stirring, filling the mixture in a reaction kettle to react at 120-240 DEG C for 10-20 h, centrifugally separating the obtained products and drying the same at 50-100 DEG C in vacuum; (2) the Bi2WO6 synthesized by the liquid phase method is of a flower-shaped grade structure assembled by nanometer pieces, dispersing the obtained Bi2WO6 with flower-shaped structure in a mixed solvent of methanol and water, adding different dosages of such acids or salts containing precious metals as chloroplatinic acid or chloroauric acid, uniformly stirring, and ultrasonic dispersing for 10-120 min; (3) putting the mixed solution under an ultraviolet lamp, and irradiating for 10-240 min to obtain the precious metal loaded Bi2WO6 visible light photocatalyst. The method has the advantages of simple technique and low cost, and the prepared precious metal loaded Bi2WO6 visible light photocatalyst has high visible light catalytic activity.

Compositions, synthesis and applications for furan, thiophene and selenophene derivatized benzo[1,2-b:3,4-b′]dithiophene(BDT)-thienothiophene (BDT-TT) based polymers, namely, poly[(4,8-bis(5-(2-ethyhexyl)selenophen-2-yl)-benzo[1,2-b;4,5-b′]dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-3-fluorothieno[3,4-b]thiophene)-2-6-diyl (CS-15), poly[(4,8-bis(5-(2-ethyhexyl)selenophen-2-yl)-benzo[1,2-b;4,5-b′]dithiophene)-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene)-2-carboxylate-2-6-diyl (CS-16), poly[(4,8-bis(5-(2-ethyhexyl)furan-2-yl)-benzo[1,2-b;4,5-b′]dithiophene)-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene)-2-carboxylate-2-6-diyl (CS-18) and poly[(4,8-bis(5-hexylfuran-2-yl)-benzo[1,2-b;4,5-b′]dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-3-fluorothieno[3,4-b]thiophene)-2-6-diyl (CS-24) are disclosed. Further, an organic solar cell constructed of a derivatized benzo[1,2-b:3,4-b′]dithiophene(BDT)-thienothiophene (BDT-TT) based polymer is discussed.

The invention relates to a silicon-based single-junction gallium indium nitride solar cell which comprises a back electrode (11), a silicon substrate (1), a seed crystal layer (2), a buffer layer (3), an n-type doped GaN buffer layer (4), an InaGal-aN layer (5), an unintentional doped InbGal-bN layer (6), a p-type doped IncGal-cN layer (7), a window layer (8), a positive electrode (9) and an anti-reflection conductive film (10) which are arranged from bottom to top, wherein the silicon substrate and the InaGal-aN layer is are an n-type doped structure, the seed crystal layer and the buffer layer are made of ZnO material, the window layer is made of p-type heavily doped GaN, and the anti-reflection conductive film covers areas of the window layer other than the positive electrode. The solar cell can quite effectively solve the problems of lattice matching, thermal expansion coefficient matching and the like encountered when a GaN film extends from the silicon substrate, and has the advantages of low manufacturing cost, high sunlight absorbability and the like.

Compositions, synthesis and applications for benzene, furan, thiophene, selenophene, pyrole, pyran, pyridine, oxazole, thiazole and imidazole derivatized anthra[2,3-b:6,7-b′]dithiophene (ADT) based polymers, namely, poly{5,11-bis(5-(2-ethylhexyl)thiophen-2-yl)anthra[2,3-b:6,7-b′]dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one-4,6-diyl}, poly{5,11-bis(5-(2-ethylhexyl)furan-2-yl)anthra[2,3-b:6,7-b′]dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one-4,6-diyl and poly{5,11-bis(5-(2-ethylhexyl)selenophen-2-yl)anthra[2,3-b:6,7-b′]dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one-4,6-diyl} are disclosed. Further, an organic solar cell constructed of a derivatized anthra[2,3-b:6,7-b′]dithiophene (ADT) based polymer is discussed.

The invention discloses a MoSe2 nanosheet composite fireworks-shaped TiO2 nanorod array including a TiO2 nanorod array and MoSe2 nanosheets; the MoSe2 nanosheets are evenly and distributed on the surface of the TiO2 nanorod array in quantity and have good composite on the surface of the array; the TiO2 nanorod array is formed by self-assembling TiO2 nanorods. The invention also discloses a preparation method of the MoSe2 nanosheet composite fireworks-shaped TiO2 nanorod array; the MoSe2 nanosheets are evenly grown on the fireworks-shaped TiO2 nanorod array by a two-step solvothermal method, and the material with good composite morphology is obtained. The prepared semiconductor material has the advantages of increased spectral absorption range and specific surface area, reduced current carrier composite rate, and good photocatalytic degradation performance, and has great application potential in the field of photocatalytic degradation. The preparation method has the advantages of simple operation, high yield, low preparation cost and the like.

The invention provides a polypyrrole / silver@silver chloride core-shell structure nano wire, and a preparation method and application thereof. A silver@silver chloride core-shell structure nano wire is synthesized by a two-step etching method at first; the silver@silver chloride nano wire is coupled with polypyrrole to prepare the polypyrrole / silver@silver chloride core-shell structure nano wire; the polypyrrole / silver@silver chloride core-shell structure nano wire has application potential in development of a photoelectric chemical sensor. Compared with the prior art, the silver nano wire disclosed by the invention can quickly transfer electrons and effectively stop recombination of electrons and holes; due to polypyrrole, an absorption range of an electrode to visible light is expanded, and the light current conversion efficiency is improved. By detection on pyrogallol, a polypyrrole / silver@silver chloride photoelectric chemical sensor has the advantages of quick response, high sensitivity, high selectivity and the like.

A conjugated polymer containing isoindigo units is disclosed, which has the following structure: P: formula I; wherein, Ar is formula II, formula III or formula IV; R1 is a C8-C20 alkyl; R2 is a C1-C12 alkyl; n is an integer of 2-50. The conjugated polymer containing isoindigo units of this type has good solubility and film-forming property, as well as high thermal stability. HOMO and LUMO energy level are regulated effectively; the absorption range is broaden; and the energy conversion efficiency is greatly improved. A preparation method for the above conjugated polymer containing isoindigo units and use thereof in related fields are also provided.

The invention discloses a ternary nanocomposite Au / RGO-TiO2 nanotube array as well as a preparation method and application thereof. A graphene film and nano gold particles are modified on the surface of a titanium dioxide nanotube array; and the nano gold particles are also modified and distributed on the inner pipe wall and the outer pipe wall of the titanium dioxide nanotube array. By the ternary nanocomposite Au / RGO-TiO2 nanotube array as well as the preparation method and the application thereof, the adsorption capability and the electron conduction capability of the titanium dioxide nanotube array are further enhanced, the absorption range of a visible light zone is widened, and the photoelectric conversion efficiency is improved.

The invention discloses an environmental-function nano material Cu-Fe / TiO2 nanotube array, and preparation and application thereof. The preparation method of the Cu-Fe / TiO2 nanotube array comprises the following steps: preparing a TiO2 nanotube array by using an anodic oxidation process; depositing copper on the inside and surface of the TiO2 nanotube by using a pulse electrodeposition process, so that the Cu-TiO2 composite nanotube array has stronger adsorption capability and electronic conduction capability; and depositing iron nanoparticles on the inside of the Cu-TiO2 composite nanotube by using a pulse electrodeposition process, thereby increasing the concentration of hydroxyl free radicals in the photocatalytic reaction process. The electrodeposition of multiple metals by multiple steps is favorable for obtaining the uniformly-distributed granular photocatalytic nano material. The TiO2 nanotube array modified by iron and copper effectively widens the absorption range of TiO2 in visible light regions, reduces the photo-corrosion, enhances the photoelectric conversion efficiency, and shows excellent photocatalytic efficiency in the research on photocatalytic degradation of toxic organic pollutants and photo-reduction of heavy metal ions.

The invention relates to a preparation method of a flower-like molybdenum disulfide and UiO-66 combined photocatalyst, wherein the method comprises the steps: by using zircon salt and an organic ligand as precursors and a polar solvent as a dispersing agent, preparing a white solid product, namely spherical UiO-66 nanoparticles, by a solvothermal method; then dispersing the spherical UiO-66 nanoparticles into distilled water to form a milk white solution; sequentially adding a molybdenum source and a sulfur source into the milk white solution, ultrasonically dissolving and stirring for 30 min,transferring into an autoclave with a polytetrafluoroethylene liner, heating at constant temperature, cooling to room temperature, and centrifugally separating to obtain a grey black product; and finally, washing the grey black product with absolute ethyl alcohol, and performing vacuum drying to constant weight to obtain the flower-like molybdenum disulfide and UiO-66 combined photocatalyst. Themethod is simple to operate, the raw materials are easy to obtain, the cost is low, and the obtained photocatalyst has excellent photocatalytic degradation performance.

The invention discloses an organic thin-film solar cell based on dual mixed active layers and a preparation method thereof. The organic thin-film solar cell is of a positive type structure and sequentially comprises a transparent substrate, a transparent anode electrode, an anode modification layer, the first mixed active layer, the second mixed active layer, an electronic buffer layer and a cathode electrode from bottom to top. The first mixed active layer is formed by doping P-type materials with double materials. The second mixed active layer is formed by doping double materials with N-type materials. The P-type, N-type and double materials are doped to form the dual heterojunction type active layers so as to absorb light of different wavebands, and meanwhile the advantages of the bulk heterojunction and the advantage of connecting the double materials with the P-type and N-type materials to form the dual heterojunction are utilized, so that the solar cell greatly improves the device light absorption efficiency, increases the absorption wavelength, improves exciton transmission and separation efficiency, and finally improves the conversion efficiency.

The invention relates to a C3N4 / SiO2 heterojunction photocatalyst and a preparation method thereof. The method comprises the following steps that 2 g of melamine and a certain mass of nanosilicon dioxide are weighed; 10 ml of deionized water is added into the mixture; ultrasonic dispersion is performed for 4 h; the obtained suspension is stirred at the temperature of 90 DEG C for 12 h; then, the obtained solid is heated to 540 DEG C at the heating speed of 4 DEG C per min; the temperature is kept constant for 4 h; after natural cooling, the C3N4 / SiO2 heterojunction photocatalyst is obtained. The C3N4 / SiO2 heterojunction photocatalyst has the excellent organic pollutant degradation performance under visible light. According to the preparation method, the raw materials are cheap, and the method is simple, so that the product cost is effectively lowered, the visible light absorption range is enlarged due to composition of C3N4 and SiO2, the sunlight utilization rate is increased, and the high practical value and application prospect are achieved.

The invention discloses a preparation method of a titanium dioxide nanoflower rich in oxygen vacancies. The method comprises steps as follows: the titanium dioxide nanoflower rich in oxygen vacanciesis prepared from ultrathin anatase nanosheets by self-assembly and is rich in a large number of oxygen vacancies. The titanium dioxide nanoflower rich in oxygen vacancies is an efficient and stable photoelectric converting material and is prepared with a solvothermal method, a preparation process is simple, reaction conditions are easy to control, and therefore, the titanium dioxide nanoflower issuitable for large-scale preparation and industrial production.

The invention relates to the technical field of the analysis testing method, in particular to a testing method for a plant source volatile organic matter; a sampling tube uses Tenax-TA, Carboxed 1000 and Carbosieve SIII as filling materials for filling; the volatile organic matter is absorbed in the sampling tube and carries out thermal desorption by two times through a secondary thermal desorption instrument; the desorption gas enters a gas chromatograph for separation and measurement with the carrier gas by being coupled on-line from the thermal desorption instrument; the invention adopts three different filling materials, expands the absorbing range of the sample, guarantees the complete collection of the sample, holds high separation capacity for chromatographic peak by adopting a capillary chromatographic column and can not cause the widening of the chromatographic peak; in the process of collecting and analyzing samples, the water disturbance is eliminated and the analysis capacity to the compound is strengthened; low temperature or cooling equipment is not needed, the analysis cost is reduced, the sensitivity of the sample analysis is improved, and the analysis requirement of the plant source volatile organic matter is met, thus reaching the T0-17 standard of an EPA method.

The invention discloses a compound photocatalyst formed by co-modifying TiO2 by silver and graphene. The compound photocatalyst is prepared from the following steps: (1) dispersing graphene oxide in water to obtain a graphene oxide dispersion solution; (2) dissolving AgNO3 in water to obtain an AgNO3 solution; (3) mixing the graphene oxide dispersion solution, the AgNO3 solution, TiO2 powder and sodium citrate and uniformly dispersing the mixture; (4) transferring the mixture obtained in the step (3) to a hydrothermal kettle, and raising the temperature for a hydrothermal reaction; and (5) after the reaction, cooling the mixture to room temperature and washing and drying the same. The preparation method of the compound photocatalyst is simple and feasible and economic in raw material, doesnot generate toxic and harmful substances, can degrade formaldehyde in air under irradiation of visible light, and can be used repeatedly.

The invention discloses a bismuth tungstate-MIL-53 (Al) composite material and a preparation method and application thereof. The preparation method comprises adding a metal-organic framework materialMIL-53 (Al) into a metal salt solution for Bi2WO6 synthesis, carrying out full stirring, adjusting pH through a NaOH solution and preparing a loaded visible photocatalyst Bi2WO6 / MIL-53(Al) composite material through a solvothermal method. Through control of reaction conditions of the solvothermal method, the microstructure and morphology of the composite material are adjusted. The loaded Bi2WO6 / MIL-53(Al) composite material has bulk morphology. Bi2WO6 is uniformly distributed on the carrier MIL-53(Al). The loaded composite material photocatalyst has high catalytic activity, has a rhodamine B degradation rate of 97% and has a certain stability and reusability. The preparation method has simple processes and low energy consumption and is easy to industrialize.

The invention discloses an energy-absorbing method based on a hybrid dynamic polymer. The hybrid dynamic polymer contains both organic borate bonds and inorganic borate bonds and selectively containsone or more selected from a group consisting of boric anhydride dynamic covalent bonds and supramolecular hydrogen bonds. Due to dynamic reversibility of the boron-containing dynamic covalent bonds and the supramolecular hydrogen bonds, the hybrid dynamic polymer can provide the good functions of damping, shock absorption, sound insulation, impact resistance and the like as an energy-absorbing material; and the hybrid dynamic polymer is especially applicable to the body protection of people during exercises, daily life and working, the body protection of the military police, explosion prevention, protection in airborne landing and aerial delivery, collision prevention of automobiles, anti-impact protection of electronic products and electric appliances, etc.

The invention discloses a preparation method and an application for palladium-modified titanium dioxide with a three-dimensional flower-like structure exposure [001] crystal face. The preparation method is characterized by comprising: a step I, preparing titanium dioxide with a three-dimensional flower-like structure exposure [001] crystal face; and a step II, preparing palladium-modified titanium dioxide with a three-dimensional flower-like structure exposure [001] crystal face. According to the preparation method and the application for the palladium-modified titanium dioxide with the three-dimensional flower-like structure exposure [001] crystal face provided by the invention, the method is simple and easy to implement; conditions are gentle; operation is simple; the preparation period is short; the preparation success rate is high; photocatalytic activity under a visible light condition is high; raw materials are economical and available; and the palladium-modified titanium dioxide can realize mass production, is easy to recycle and reuse, and can be applied to photocatalytic degradation on wastewater pollutants.

The invention discloses a CdZnTe (cadmium zinc telluride) thin film solar cell with a gradient band gap structure, comprising a glass substrate, wherein a front electrode layer of transparent conducting oxides, an n-type CdS (cadmium sulfide) window layer, a p-type Cd1-xZnxTe absorption layer and a back electrode layer are deposited on the glass substrate in sequence; the p-type Cd1-xZnxTe absorption layer comprises three areas; the band gap in an intermediate area is not changed and mainly used for strengthening the absorption of sun peak spectrums; and the two areas at two sides are of a gradient band gap structure and used for broadening the absorption range of the solar spectrums. The structure is used to reduce the back surface recombination rate of a cell carrier, improve the ohmic contact of a back electrode of the cell and increase the open-circuit voltage and the short-circuit current of the cell, thus improving the performances of the cell.

The invention provides an adjustable vacuum sucker device for assembling and adjusting a lens of a photoetching machine and relates to the technical field of the manufacturing, assembly and adjustment of projection objective lens of deep ultraviolet photoetching machines. By the adjustable vacuum sucker device, the problem that lenses, lens barrels and lens frames of different dimensions cannot be reliably absorbed and transported in the process of processing and assembling photoetching projection objective lenses is solved. The adjustable vacuum sucker device comprises an adaptive joint, an upper cover, a shell, a worm wheel, a worm screw, an adjusting handle, shift pins, a connecting rod and rubber suction nozzles. The three shift pins which are circumferentially and uniformly distributed are driven to rotate through the meshing driving of the worm wheel and the worm screw; and the shift pins shift the connecting rod to make the centrosymmetrical three rubber suction nozzles synchronously moved from the center to the periphery. The sucker device has a simple structure, steplessly adjustable suction ranges, large adjustment ranges and capability of self locking, and the rubber suction nozzles do not damage the surfaces of sucked workpieces. The sucker device can be used for sucking optics lenses and the suction of parts such as the lens frames and the like with annular end faces, has a simple structure, can be used for nondestructive clamping, is continuously adjustable, and can simultaneously suck the lenses and the lens frames.

The invention provides a nanometer composite material ZnIn2S4@PCN-224 based on ternary sulfide ZnIn2S4 and porphyrin MOFs (Metal-organic Frameworks). The nanometer composite material is prepared by the following steps: firstly dispersing activated PCN-224 into a N,N-dimethyl formamide-glycerol mixed solution, then adding ZnCl2, InCl3.4H2O and TAA and stirring for 0.5-1.5 hours; and performing heatinsulation treatment on a mixed suspension for 8-12 hours at a temperature of 160-200 DEG C, cooling to a room temperature, washing a solid product with distilled water and ethanol, performing centrifugal separation and precipitation, and drying to obtain solid powder, namely the ZnIn2S4@PCN-224. The nanometer composite material ZnIn2S4@PCN-224 provided by the invention has the benefits that theZnIn2S4 is loaded onto the porphyrin metal-organic framework PCN-224 through a solvo-thermal method, so that on one hand, organic pollutants can be better absorbed, and on the other hand, the separation efficiency of photo-generated electrons and holes is remarkably improved, and the photo-catalytic hydrogen production activity is significantly improved.

The invention discloses a wavy MoS2 nanosheet inlaid TiO2 dandelion nanosphere composite heterojunction semiconductor material. The wavy MoS2 nanosheet inlaid TiO2 dandelion nanosphere composite heterojunction semiconductor material contains MoS2 nanosheets and TiO2 dandelion nanospheres, wherein the MoS2 nanosheets penetrate through the space among nanorods on the TiO2 dandelion nanospheres uniformly and can be stably combined with gaps among the nanorods,. The invention also discloses a method for preparing the wavy MoS2 nanosheet inlaid TiO2 dandelion nanosphere composite heterojunction semiconductor material by a two-step solvent method. The wavy MoS2 nanosheet inlaid TiO2 dandelion nanosphere composite heterojunction semiconductor material and the method have the advantages that the preparation operation is simple, the yield is high and the cost is low, and the wavy MoS2 nanosheet inlaid TiO2 dandelion nanosphere composite heterojunction semiconductor material has great potential and wide application prospect in the fields of photo-catalytic industrial wastewater and field emission.

The invention relates to a multisection silicon-based film solar cell structure and a process thereof. The multisection silicon-based film solar cell structure mainly comprises a base plate, a transparent conductive film, a first photoelectric conversion layer, a second photoelectric conversion layer, a third photoelectric conversion layer and an electrode, wherein the energy gap of the first photoelectric conversion layer is larger than that of the second photoelectric conversion layer, the energy gap of the second photoelectric conversion layer is larger than that of the third photoelectric conversion layer, and an embedded type crystal structure is arranged in the second photoelectric conversion layer. The arrangement mode of the energy gap can be used for improving the absorption range of optical wavelengths and increasing the photoelectric conversion efficiency of the solar cell.

The invention relates to the technical field of organic materials and provides a thienothiophene quinoid organic photoelectric material. The material is a compound which is shown as a structural formula (I); in the formula, R1, R2, R3, R4, R5 and R6 are selected from H, C1-C20 alkyl group or C1-C20 alkoxyl group; and m and n are integers of 0-10. The invention also provides a preparation method and application of the thienothiophene quinoid organic photoelectric material. Since the thienothiophene quinoid organic photoelectric material has a quinoid thiophene ring and a cyano group, wider spectral response is guaranteed, the photoelectric conversion efficiency of the material is increased, and better thermal stability and environmental stability are shown.

The invention relates to a method for preparing a nano-silver loaded tungsten trioxide with high photocatalytic activity, which belongs to the technical field of inorganic photocatalyst preparation process. The method of the invention is characterized in that the method comprises the following steps: preparing a tungsten trioxide nano sheet as a substrate by using a new method; then through an ultraviolet reduction method, uniformly loading nano silver on the tungsten trioxide nano sheet; and roasting the obtained product at a certain temperature in the state of wetting so as to obtain a novel nano-silver loaded tungsten trioxide, thereby achieving the purpose of improving the photocatalytic activity of the tungsten trioxide. The photocatalyst prepared by using the method in the invention can be used for processing discharged industrial wastewater such as dye wastewater and the like, and compared with other methods, the catalytic efficiency of the photocatalyst prepared by using the method in the invention is greatly improved; and meanwhile, the method in the invention has the advantages of simple process and environmental protection, etc.

The invention discloses a preparation method of a carbon quantum dot supported TiO2 nano-composite material (CQDs / TiO2). The method includes: dissolving glucose in deionized water and placing the solution in a microwave oven to heat the solution, on high fire, for 3-6 min; after the reaction is finished, adding deionized water to the mixture and uniformly stirring the mixture for dilution to obtain a carbon quantum dot solution; then adding deionized water and tetrabutyl titanate to the carbon quantum dot solution to perform hydrothermal reaction, after the reaction is finished, washing the product with deionized water, and drying the product to prepare the CQDs / TiO2 nano-composite material. In the method, CQDs are supported on the TiO2 through the hydrothermal reaction; by introducing theCQDs, absorption range on visible light of the TiO2 is enlarged. The product, when being used in photocatalytic reduction of CO2, is high in yield of CO, maximum yield reaching 43 [mu]mol / g*h.

The invention relates to I-III-VI group semiconductor quantum dots, in particular to a synthesis method for an Ag-In-Zn-S / CQDs heterojunction material. The synthesis method comprises the following steps: weighing and dissolving silver nitrate, indium nitrate and zinc acetate dihydrate in deionized water, stirring and dissolving to obtain a clear solution; dissolving a mixed ligand thiohydracrylicacid (MPA) and L-cysteine (Cys) in an aqueous solution; then adding into the clear solution to obtain a mixed solution; adjusting the pH value of the mixed solution with a NaOH solution; then adding thioacetamide and stirring ultrasonically; then adding carbon quantum dots in different amounts; then carrying out a hydrothermal reaction; and after the reaction, carrying out centrifugal drying to obtain the Ag-In-Zn-S / CQDs heterojunction material with different photocatalytic performance by selecting the capacity of the carbon quantum dots and the temperature of the hydrothermal reaction.

The invention discloses a method for preparing a transparent electrode based on titanium dioxide nanotubes. The method comprises the following steps of: peeling titanium dioxide nanotube films in different thicknesses off a titanium metal base by using an anodic reoxidation method to improve the quality and crystallinity of the titanium dioxide nanotube films; and adhering the titanium dioxide nanotube films to different transparent conductive substrates to form a single-layer or multi-layer transparent electrode based on the titanium dioxide nanotubes. The quality and the crystallinity are high, the method for preparing the single-layer or multi-layer transparent electrode based on the titanium dioxide nanotubes has the characteristics of simplicity, reliability and high flexibility, and the titanium dioxide nanotubes are easily applied to different fields such as dye-sensitized solar cells.