106results about How to "Excellent photoluminescence performance" patented technology

The invention relates to a method of preparing a carbon quantum dot-doped sodium borosilicate glass material. The method comprises the following steps: (1) by adopting ethyl orthosilicate, boric acid and metal sodium as precursors, proportioning the following components in percentage by mass of 5-15% of Na2O, 15-30% of B2O3 and 55-80% of SiO2 to form cracking-free and complete sodium borosilicate dry gel by virtue of a sol-gel method, heating the sodium borosilicate dry gel to 400-470 DEG C in a tubular furnace under O2 atmosphere, carrying out heat preservation for more than 10 hours until the organic substances are completely removed and cooling to obtain a porous sodium borosilicate glass dry gel; (2) immersing the porous sodium borosilicate glass dry gel prepared in the step (1) in a solution of carbon quantum dot, soaking at room temperature, preserving for 6-24 hours, taking out, drying for 10-24 hours at 60-90 DEG C, placing dried porous sodium borosilicate glass dry gel in the tubular furnace, heating to 550-650 DEG C under N2 atmosphere at a heating rate of 10-30 DEG C / h, densifying, carrying out heat preservation for 10-30 hours, naturally cooling to room temperature, closing N2 to obtain the carbon quantum dot-doped sodium borosilicate glass material, wherein solvents for the solution of carbon quantum dot is toluene, ethanol or n-hexane so that the size of the carbon quantum dot is smaller than that of the porous carbon sodium borosilicate dry glue.

The invention relates to a chemical method for preparing three-dimensional dendritic copper selenide nano-crystalline photoelectric film material. The preparation method of the material includes that sheet copper or base material provided with metallic copper surface, simple substance selenium powder and organic alcohol solvent are all placed into a tetrafluoroethylene kettle, direct reaction is carried out for 1-3 hours at the temperature of 190 DEG C or above, and photoelectric film material composed of copper selenium nano-crystalline in three-dimensional dendritic structure is prepared on the metallic copper surface in situ. The film material shows better photoabsorption and photoluminescence performances. After reaction is finished, the kettle is naturally cooled to room temperature, and final product is washed by absolute alcohol and dried below 50 DEG C. The base material provided with metallic copper surface is a sheet copper and conductive glass ITO with metallic copper plated on surface. The invention uses organic alcohol solvent as reaction medium, thus being environmentally friendly; no additive or surfactant is adopted, following purifying step is not required while crystal form is perfect; and reaction is rapid, operation is convenient, and cost is greatly reduced.

The invention discloses a nano structure yttrium aluminum garnet-based transparent ceramic material, a preparation method and an application thereof. A transparent ceramic made of the material is of anano composite-phase structure consisting of YAG and Al2O3, and in addition the grain sizes of a YAG crystal phase and an Al2O3 crystal phase are both smaller than 100nm. A YAG-based transparent ceramic is prepared from an amorphous block glass precursor through thermal treatment, in the thermal treatment process, a part of aluminum dioxide in the block glass precursor is reacted with yttrium oxide, then the YAG crystal phase is generated, and the generated YAG crystal phase and the residual aluminum oxide crystal phase form a composite phase nano structure. The YAG transparent ceramic material has hardness and elastic modus comparable to or even superior to those of a YAG single crystal, is optically transparent between visible light and middle-infrared bands, has excellent photoluminescence properties after light activated ion doping, and has wide application prospects in fields such as laser, fluorescence, flicking light emission, optical lenses, artware and jewelries.

The invention relates to a preparation method and an application of a gold nanocluster with adjustable fluorescence and size. The method adopts mercaptosilane commonly used in the industry as a stabilizer and a reductant, and prepares the gold nanocluster in a way of chloroauric acid photochemical reduction. The method is quick, effective and simple in preparation program, no extra reductant is added, and no reaction produces in a multi-phase environment. The gold nanocluster prepared with the method can be uniformly dispersed in an organic solvent and water, and has excellent photoluminescent performance. The maximum excitation wavelength of the fluorescence of the gold nanocluster is positioned in a visible light region (400-460nm) and the position of an emission peak can be adjusted and controlled in a range of 530-580nm. The gold nanocluster has the characteristics of visible light excitation, large Stokes shift and adjustable fluorescence-emission color and size, thereby having potential application prospects in the fields of fluorescence imaging, marking and catalysis.

The invention discloses high-concentration pyridine-nitrogen-atom-doped carbon quantum dots and a preparation method thereof. The doped carbon quantum dots take carbon source and nitrogen source organic compounds as a precursor and are prepared via a green eco-friendly one-step hydrothermal method, thereby guaranteeing that pyridine nitrogen atoms are doped into the inner structure and external surface of the carbon quantum dots. The preparation method is simple and easy to operate, the reaction condition is easy to control, and organic reagents are not required. The diameter of the doped carbon quantum dots is 1.5-6 nm. The doped carbon quantum dots can be uniformly stably dispersed in deionized water, are excellent in photoluminescence performance, and have the quantum yield reach 39.8%.The doped carbon quantum dots are green and non-toxic, are excellent in biocompatibility, can enter cell membranes for imaging, and are suitable for preparing biomedical imaging probes.

The invention discloses a method for synthetizing nano zinc oxide particles by utilizing high-temperature self-propagating reaction. The method includes: mixing chemically pure Al, CuO, ZnO and ZrO2 powder with grain size of 200 meshes according to a certain proportion, filling the powder in a graphite crucible and laying a layer of pyrophoric powder on the surface of the powder, generating self-propagation high-temperature reaction by igniting the pyrophoric powder, obtaining product in a stainless steel collector disposed at a position 30-40cm above the crucible, placing the collected product into a tubular furnace for annealing at the temperature of 150 DEG C-250 DEG C for 10-30min and carrying out slow furnace cooling to obtain a final product. The synthetic method for zinc oxide nano-particles is simple in process, low in equipment requirement, high in yield, high in purity and full of industrial production value.

The invention relates to carbon material surface silicon carbide nanowhiskers and a preparation method thereof. The technical scheme is as follows: uniformly mixing silicon powder and silicon dioxide powder according to the mole ratio of 1 to (0.3-4) to obtain a silicon source; placing asphalt-based carbon fiber or carbon fiber felt in a high-temperature graphitization furnace, thermally treating for 0.5-1h at 1000-2800 DEG C in argon atmosphere, thereby obtaining a carbon source; orderly placing the silicon source and the carbon source in a graphite crucible according to the mole ratio of 1 to (0.25-4), and then placing the graphite crucible in a high-temperature carbonization furnace, vacuum-pumping to 5-20Pa, pumping in argon to normal pressure; warming the high-temperature carbonization furnace to 1200-1500 DEG C in a speed rate of 10-20 DEG C / min under the argon atmosphere condition, keeping temperature for 0.5-3h, naturally cooling to room temperature to obtain the carbon material surface silicon carbide nanowhiskers. The preparation method disclosed by the invention is simple in process, mild in reaction condition, environment-friendly; and a prepared product is excellent in optical property and electrochemical property.

The invention discloses a preparation method of an in-situ growth quantum dot optical film. The method comprises the following steps: in situ growing an organic film layer with high-dispersible quantum dots on an ITO (Indium Tin Oxide) glass substrate by a combined process technology of sol-gel and spin coating, wherein the organic film layer serves as a photoluminescence layer; then, carrying out the organic matter spin coating, encapsulation and insulation processes to finally prepare the in-situ growth quantum dot optical film with high dispersibility. The method is novel, low in preparation cost and simple in preparation process. In addition, the particle diameters of quantum dots in the photoluminescence layer are accurately controlled and dispersibility is good due to the adoption of the in-situ growth technology. According to the preparation process of the quantum dot optical film, the particle diameters of quantum dots are effectively controlled and the high-dispersible distribution of the quantum dots in the photoluminescence layer is realized by fully utilizing obstruction, regulation and control functions of the organic matters to the growth of the quantum dots, so that the photoluminescence property of the quantum dot optical film is effectively improved. Thus, the quantum dot optical film disclosed by the invention has a very important application value in a novel photoelectric display device.

The invention discloses a manganese complex serving as an X-ray scintillator material and application of the manganese complex in preparation of a flexible X-ray scintillator film. The structure of the manganese complex is shown as a formula (I). In the formula (I), R1, R2, R3 and R4 are respectively and independently alkyl or aryl groups; A is N or P; and X is F, Cl, Br or I. The manganese complex disclosed by the invention has the advantages of low preparation cost, excellent photoluminescence performance, good stability, environmental friendliness and the like.

The invention relates to the synthesis technology of new luminescent materials, and is a new-type electrically neutral tridentate iridium [III] complex red light material and a preparation method thereof. It is a 6-[5-trifluoromethylpyrazole]-2,2'-bipyridine·2,6-diphenylpyridine iridium[III] complex. Under the protection of nitrogen, the trihydrate iridium trichloride [III] metal salt reagent and 6-[5-trifluoromethylpyridine]-2,2'-bipyridine tridentate chelate ligand were heated in ethanol, and the reaction The liquid was pumped dry for recrystallization, filtered, washed, and vacuum-dried to obtain an orange-yellow solid intermediate; in a nitrogen glove box, the orange-yellow intermediate, silver trifluoromethanesulfonate, and 2,6-diphenylpyridine ligand were uniformly mixed , ground into powder, heated, after the reaction solution was cooled to normal temperature, the filtrate was collected and dried to obtain the crude product, the crude product was separated, the second orange-red eluate was collected and dried, and vacuum-dried to obtain the final product, the yield was up to 30-68%.

The invention belongs to the technical field of luminescent materials, and particularly relates to borosilicate rare earth luminescent microcrystalline glass, and a preparation method and applicationthereof. The chemical composition of the borosilicate rare earth luminescent microcrystalline glass is aMO.bLn<2>O<3>.cB<2>O<3>.dSiO<2>.eAl<2>O<3>: xBi, yGe, zRE. According to the invention, rare earth ions including RE, Bi, Ge, Al and the like are doped into the microcrystalline glass, and a crystal field around the rare earth ions is further adjusted by utilizing different ion radiuses, coordination potentials, bond types, bond lengths, coordination numbers and the like of the rare earth ions, so the control of color and luminous intensity is facilitated; and through sensitization of Bi ionsto other rare earth ions (such as Tb<3+>, Eu<3+>, Tm<3+>, Dy<3+> and the like), the microcrystalline glass has higher luminous intensity and can be applied to LED luminescent devices.

The invention provides a preparation method and application of fungal hypha nitrogen and sulfur self-doped carbon dots and belongs to the field of researches of fluorescent carbon nano-materials. Thepreparation method comprises the following preparation steps: (1) firstly, preparing fungal hyphae by utilizing a biosynthesis technology; culturing the hyphae in a PDA (Potato Dextrose Agar) solid culture medium at constant temperature; then inoculating the hyphae into a modified PDA liquid culture medium and culturing in a constant-temperature oscillator; finally, purifying the hyphae; and (2) taking the hyphae as a raw material and synthesizing the nitrogen and sulfur self-doped carbon dots (N,S-CDs) in one step under a hydrothermal condition. According to the preparation method provided bythe invention, a method combining biosynthesis and the hydrothermal condition is adopted for the first time, and the N,S-CDs with excellent performance are prepared. The N,S-CDs can be used for carrying out high-selectivity and high-sensitivity detection on tetracycline antibiotics (TCs); and when the concentration of TC is 0.5 to 38.46muM, the linear correlation coefficient is 0.991 and the TC detection limit is 0.041muM. The N,S-CDs are used for preparing fluorescence detection test paper and the fluorescence detection test paper can be used for rapidly detecting the TCs in culture wastewater. The N,S-CDs do not influence the survival rate of cells and have a very great application potential in the field of cell imaging.

The invention relates to a preparation method of a noble metal / SiO2 composite particle and semi-conductor quantum dot laminated quantum dot luminescent thin film. The preparation method comprises thefollowing steps: on an ITO glass substrate, single-layered metal nano-particles kernels are assembled to serve as a plasma excimer enhancement center, and metal nano-particles are wrapped with SiO2 housings to serve as isolating layers; and a CuInS / ZnS quantum dot semi-conductor quantum dot is taken as a photoluminescence center. The noble metal / SiO2 composite particle and semi-conductor quantum dot laminated quantum dot luminescent thin film is prepared by the spin-coating process, and the quantum dot luminescent thin film is finally prepared by the organic spin-coating and packaging processes. The preparation method is novel, low in manufacture cost and simple in preparation process, and becomes the most effective method which most probably improves the light field intensity of the semi-conductor quantum dot, improves the utilization efficiency of exciting light and accordingly improves the overall luminescence property of the semi-conductor quantum dot luminous optical film at last.

The invention discloses a method for preparing rod-like zinc oxide nano-crystals, comprising the following steps of: step 1, adding dropwise ammonia-water solution to zinc salt aqueous solution at the room temperature, and after thorough reaction, performing washing using water and centrifugal separation, thereby obtaining amorphous zinc hydroxide; and step 2, preparing the amorphous zinc hydroxide obtained through the step 1 into a dispersion system and then adding potassium hydroxide solution, arousing a constant-temperature reaction of the mixed solution, washing the obtained sediments using water, and centrifugally separating and drying the sediments, thereby obtaining the rod-like zinc oxide nano-crystals. The product prepared by the method disclosed by the invention is the rod-like zinc oxide nano-crystals which are small in size, large in specific surface area, obvious in nanometer effect, and excellent in properties such as photoluminescence, photocatalytic degradation and the like; and the method is simple in preparation process, high in yield, free of needs of any template or special substrate and any chemical additive, free of pollution, and low in energy consumption.

The invention discloses a copper nano cluster with high stability and near-infrared phosphorescence and a preparation method thereof, and belongs to the crossing field of coordination chemistry and nano materials. Common p-tert-butyl thiophenol and triphenyl phosphine are used as protective ligands of the copper nano cluster, the copper nano cluster with near-infrared luminescence is synthesized through a simple one-pot method at the room temperature in an air atmosphere, and the yield is high. The molecular formula of the copper nano cluster is [Cu11(SC10H13)9(PC18H15)6](SbF6)2, the copper nano cluster belongs to a monoclinic system, and the space group is P 21 / n. At the room temperature, a solution and a solid of the copper nano cluster both have strong red phosphorescence, and the absolute quantum yield of the solid is 22%. At the room temperature and in an air atmosphere, a solution of the copper nano cluster has strong stability.

The invention provides a food-grade environment-friendly natural-degradable plastic bag. The plastic bag is prepared from the following components in parts by weight: 20-60 parts of high-density polyethylene, 15-25 parts of polylactic acid, 5-8 parts of poly-beta-hydroxybutyrate, 4-10 parts of crosslinker, 20-30 parts of waste plant fibers, 10-20 parts of modified starch, 10-20 parts of grapeseedextract-lecithin / chitosan nano-particles, 10-20 parts of molybdenum dioxide nano-particles, 10-20 parts of priobiotic-embedded nano-particles, 7-10 parts of adamantane, 5-10 parts of ammonium polyphosphate, 5-10 parts of N-hydroxysuccinimide and 2-5 parts of beta-cyclodextrin. The food-grade environment-friendly natural-degradable plastic bag prepared by the preparation method has the technical effects of bacterium resistance, bacterium inhibition, oxidation resistance, high tensile strength, high wearing strength, high temperature resistance, deformation prevention, organic toxic substance leakage prevention and natural and quick degradation, and can be used for improving the soil fertility and nutritional degree after degradation.

The invention discloses a method for regulating zinc oxide crystal microstructure by using hydrogen peroxide, and the method comprises the following steps: step 1, adding zinc oxide powder of micro-nano scale to hydrogen peroxide or the water solution of the hydrogen peroxide at room temperature, with a mol ratio of ZnO:H2H2 =1:(20-200), and stirring uniformly to obtain a mixed solution; step 2, placing the mixed solution in a closed container for reaction at constant temperature, cooling to obtain a precipitate, and after washing the precipitate by water, centrifugal separating and drying the precipitate, obtaining the zinc crystals. The method of the invention is simple in technology, high efficiency, and environment friendly; and the obtained products are a series of zinc oxide crystals with different morphologies and sizes, displaying strong nanometer size effect.

A method produces nanoparticles by electrospinning a silicon composition having at least one silicon atom. The electrospinning of the silicon composition forms fibers. The fibers are pyrolyzed to produce the nanoparticles. The nanoparticles have excellent photo-luminescent properties and are suitable for use in many different applications.

The invention provides a double perovskite single crystal, a preparation method and application thereof, and a double perovskite single crystal photoelectric detector, and relates to the technical field of single crystal materials. The particle size of the Cs2AgErxBi(1-x)Cl6 (x is 0-0.9) double perovskite single crystal provided by the invention is greater than or equal to 1mm. Compared with a nano-scale single crystal, the double-perovskite single crystal provided by the invention has lower defects, higher carrier lifetime and mobility, excellent photoluminescence performance and environmental stability, and can improve the overall performance of a photoelectric device when being applied to the photoelectric device; and the photoelectric characteristics of the material can be explored. Furthermore, the erbium-doped double perovskite single crystal obviously improves the light response rate and the detection rate of photoelectric detection. Moreover, the traditional double-perovskite nano single crystal needs to be prepared into a thin film and then applied to a photoelectric device, while the double-perovskite single crystal provided by the invention can be directly applied to the photoelectric device, the film does not need to be prepared firstly, the application is simple, and the cost is low.

The invention discloses synthesis of tetrazole porphyrin metal complexes and applications of the metal complexes as dye sensitizing agents for preparation of dye-sensitized solar cells. Tetrazole is good in photoluminescence performance and is introduced into a porphyrin ring through conjugated chemical bonds, thus largely improving luminescence performance of porphyrin molecules. Four meta-position tetrazole groups of tetrazole porphyrin are bonded to TiO2 in a horizontal bonding manner. Introduction of a metal changes orbital energy level distribution, thus increasing the electron transfer efficiency and further increasing the photoelectric conversion efficiency. Compared with traditional ruthenium dye, raw materials are simple and easily available, precious metal materials are not needed, and pollution to the environment is low. Accordingly, the tetrazole porphyrin metal complexes can be adopted as dye sensitizing agents and used for preparation of dye-sensitized solar cells. Results of photoelectric property tests show that the tetrazole complexes with different metals in the dye-sensitized solar cells have certain current outputting capabilities and have different photoelectric conversion efficiencies under standard illumination.

The invention belongs to the field of fluorescent carbon quantum dot preparation, and discloses a rapid and simple preparation method of lignin-based carbon quantum dots with a high quantum yield. The method comprises the following steps: firstly, mixing a carbon source consisting of modified lignin and organic acid with a nitrogen source consisting of a nitrogen-containing reagent, adding the mixture into a solvent to obtain a mixed solution, then carrying out ultrasonic treatment on the mixed solution, and finally, carrying out microwave heating on the mixed solution for a period of time to obtain a nitrogen-containing carbon quantum dot mixed solution; and after the reaction is finished, centrifuging, filtering, dialyzing and freeze-drying the mixed solution to obtain carbon quantum dot powder. By adjusting the pH value, the surface groups are protonated or deprotonated, so that the fluorescent carbon quantum dots emitting blue light and green light are obtained. Nitrogen atom doping can stabilize the surface defects of the carbon quantum dots, improve the radiative transition probability and enhance the photoluminescence performance, so that the lignin-based carbon quantum dots with the relative quantum yield as high as 70.77% are obtained.

The invention belongs to the technical field of functional coatings and photoelectric functional films, and particularly relates to a composite functional coating and film and a preparation method andapplication thereof. A metal ion-thiocyanate aqueous solution is used as a filling solution and a doping solution, a composite solid-liquid interface system is constructed by the metal ion-thiocyanate aqueous solution and a solid film or a solid surface, and then in-situ filling or in-situ growth of a plurality of composite functional coatings and functional films is carried out. The composite coating and film are good in stability and wide in application range, and have wide applications including surface treatment, anti-corrosion treatment, weather-proof treatment, marine antifouling coatings, marine organism propagation prevention coatings and the like. Some composite functional films prepared by the invention can emit high-brightness red light under the excitation of green light, andcan be used as one of three primary color ingredients for constructing a white light emitting device (LED). The method provided by the invention is environment-friendly, and has good universality.

The invention discloses an ordered extralarge-hole-pitch alumina film and a preparation method thereof. The alumina film has high hardness and elastic modulus, low reflectivity and obvious photoluminescence performance. The surface of the film is composed of innumerable holes. The bottoms of the holes are distributed in ordered hexagons. According to the ordered extralarge-hole-pitch alumina film and the preparation method thereof, macromolecular organic acid serves as an electrolyte, the electrolyte and an aluminum base are effectively cooled simultaneously, and the aluminum base is stably oxidized under extra-high voltage. The alumina film can serve as an ideal template for preparing various ordered major-cycle nano array structures of metal, polymer and the like, and can also be used for developing three-dimensional channel alumina films of micro and nano composite structures. The major-cycle alumina film is an excellent bioactivator carrier and has wide application prospects in the aspects of biosensors, medicine transport platforms, solar cells and the like.

The invention discloses a preparation method of carbon quantum dots with a changeable color and a photothermal effect as well as a product of the preparation method and application of the carbon quantum dots. The preparation method comprises the following steps: mixing: mixing ink and water; reacting: after mixing, heating and reacting; freezing: freezing and drying to obtain quantum dot powder with the changeable color and the photothermal effect. The preparation method has the advantages of simple preparation technology and low economic cost; a surface passivating agent does not need to be added and the carbon quantum dots with the changeable color can be prepared in one step. The carbon quantum dots provided by the invention have the characteristics of color changing performance, excellent photoluminescence performance and the like, the carbon quantum dots bring a great prospect to future agriculture and are especially used for monitoring changes of cells in plants; the carbon quantum dots are dispersed in a high polymer and can be used as an anti-fake label of an agricultural film. The carbon quantum dots prepared by the preparation method have good biocompatibility, low toxicity and photoluminescence performance and can be used as a fluorescent probe in an organism. The carbon quantum dots prepared by the preparation method have the photothermal effect and can be used as acarrier for inhibiting the growth of tumors and treating the tumors.

The invention discloses a silicate luminescent material and a preparation method thereof. The chemical formula of the luminescent material is aCaO.bAl2O3.cSiO2:xCe,yTb. The preparation method of the luminescent material comprises the following steps: using at least one of oxide, carbonate and oxalate of Ca, Al2O3, SiO2 and Tb4O7 as raw materials; weighing the raw materials according to the mol ratio of elements in the chemical formula aCaO.bAl2O3.cSiO2:xCe,yTb; and evenly mixing the raw materials, heating to 1000-1500 DEG C in the reducing atmosphere, calcining at constant temperature for 4-20 hours, cooling to room temperature, and grinding to obtain the luminescent material. The silicate luminescent material is suitable for LED excitation in ultraviolet regions, and can emit green light in high efficiency. The preparation method has the advantages of simple technique and low cost.

The invention relates to photoluminescent citric acid based nanoparticles and an application and a method for living cell marking. The photoluminescent citric acid based nanoparticles have the advantages as follows: (1) the nanoparticles have excellent photoluminescent performance, can excite fluorescence imaging at the wave band of 360-480 nm and have the fluorescence quantum yield up to 15%; (2)the nanoparticles have good light stability and have the fluorescence emission spectrum not changed obviously and have high brightness after being soaked in a phosphate buffer solution and a completecell culture medium (DMED+10% fetal calf serum); (3) the nanoparticles have good biocompatibility and facilitate adhesion and proliferation of cells; (4) the photoluminescent citric acid based nanoparticles can mark stem cells and tumor cells in real time for a long time and have the marking time in vitro as long as 14 days, which is far longer than that of commercial cell markers; (5) the preparation process is simple and industrial production can be realized.

The invention relates to a preparation method for a plasma excimer enhanced quantum dot optical film. A spin coating film forming process technology is utilized, and a metal quantum dot layer acts as a plasma excimer enhancement layer, an organic high-molecular compound acts as an isolation layer and a CdSe quantum dot / organic high-molecular composite film layer acts as a photoluminescence layer respectively to prepare the plasma excimer enhanced quantum dot optical film on an ITO glass substrate. The preparation method is novel, low in manufacturing cost and simple in preparation technology. Besides, the simple spin coating process technology is adopted so that thickness of each film layer in the composite film is accurate and controllable, dispersity is great, effective control of parameters like optical field intensity distribution of semiconductor quantum dots through metal quantum dots is realized by fully utilizing high-molecular compound blocking and adjusting and control of distance between the metal quantum dots and the semiconductor quantum dots, photoluminescence performance of the quantum dot optical film is effectively enhanced, and thus the preparation method has quite important application value in novel photoelectric display devices.

The invention relates to a method for preparing sulfur-doped molybdenum dioxide nanosheets with adjustable shapes and band gaps. The method has the advantages that a method for adjusting band gaps through carrying out sulfur doping on molybdenum dioxide nanosheets is researched to obtain the nanosheets with different band gaps, then, the nanosheets can be applied to the manufacturing of micro / nanoelectronic devices, and electronic devices with excellent performance are obtained. The method has the advantages that the disadvantage that band gaps of molybdenum dioxide are oversized is overcome,and band gaps of the prepared molybdenum dioxide nanosheets are adjusted; and in order to achieve the aim, a molybdenum dioxide nanosheet band gap adjusting method is disclosed, and the sulfur dopeddegree of the nanosheets is adjusted through controlling a ratio of precursor sulfur powder to molybdenum trioxide powder and a growth temperature. Finally, the molybdenum dioxide nanosheets of different band gaps are obtained. The method disclosed by the invention is simple in processing steps and easy in reaction condition control and is adaptable to industrial production; and the product has excellent electrical properties and has a huge application value in the field of the micro / nano electronic devices.

This invention provides a phosphatide functionizing photoluminescence enhancement type nucleocapsid structural quanta point and its preparation, which belongs to composite technique field. Its material includes metal oxide, metal and nonmetal alkyl compound, the fourth nonmetal element. The nucleocapsid structural quanta point is obtained by solution high temperature cooling crystallizing, and then the phosphatide with hydrosulfide is added, and then the bioactive phosphatide functional photoluminescence enhancement type nucleocapsid structural quanta point is produced by the reaction of metal and hydrosulfide. The experimental result shows that the functionizing of phosphatide towards nucleocapsid structural quanta point not only improves colloidal state aqueous phase stability of quanta point, but also enhances its function of photoluminescence of quanta point. The degree of its photoluminescence enhancement will be a function of the concentration of phosphatide functionizing quanta point. This invention provides a biological platform for solar battery and biosensor.