59results about How to "Single crystal phase" patented technology

The invention discloses a method for preparing lanthanum-doped bismuth titanate nano powder by a sol-gel hydrothermal method, which comprises the following steps of: dissolving Bi (NO3) 3.5H2O and La (NO3) 3.6H2O into glacial acetic acid solution to obtain solution A; dropwise adding Ti (OC4H9) 4 into organic solvent to obtain solution B; dropwise adding the solution B into the solution A, and preparing even sol by magnetic stirring; putting the sol into a drying oven, and drying to obtain xerogel; grinding to obtain powdered hydrothermal reaction precursor; putting the hydrothermal reaction precursor into a hydrothermal kettle, and adding pure water taken as solvent and NaOH taken as mineralizer into the hydrothermal kettle; sealing the reaction kettle, and putting the reaction kettle into the drying oven at 160-170 DEG C; taking out products after reaction, and filtering to obtain precipitate; and finally, washing and drying the precipitate to obtain the lanthanum-doped bismuth titanate nano powder. The method can be used for preparing the lanthanum-doped bismuth titanate nano powder under the condition of low temperature, so that the energy is saved, and lanthanum-doped bismuth titanate is perfect in crystallization.

The invention discloses a p-type CuxSy semiconductor nanocrystalline, a preparation method and an application thereof and belongs to the fields of nanometer material preparation and applications. X/y of the nanocrystalline CuxSy is 1.8, the nanocrystalline is spherical, and the particle size of the nanocrystalline is 6-12nm. The preparation method includes preparing a copper source, preparing a sulfur source, injecting the copper source to the sulfur source, subjecting the solution to heating reaction to obtain a colloidal solution and subjecting the colloidal solution to washing and centrifugal sedimentation to obtain the nanocrystalline. The nanocrystalline is single in crystalline phase, good in dispersibility, controllable in size and morphology, good in electrical conductivity, high in carrier mobility and good in high temperature resistance and stability, the nanocrystalline is high in absorption ability in the whole near infrared area, and the absorption peak is 1100-1500nm. The preparation method is high in productivity and applicable to large-scale production. When the nanocrystalline is applicable to hole transport layers of thin-film solar cells, transport abilities of the hole transport layers can be obviously improved.

The invention discloses a method for recycling lithium cobalt oxide from a waste positive electrode of a lithium cobalt oxide battery. The method comprises the following steps of: (1) feeding the waste positive electrode of the lithium cobalt oxide battery into a 1-2mol/L hydrochloric acid lixivium in which citric acid is dissolved, and reacting for 4-6 hours at 60-80 DEG C; (2) filtering the lixivium in the step (1) so as to separate aluminum foil and solid grains; and (3) washing and drying the solid grains; and (4) adding a lithium source into the solid grains to adjust the mass ratio of Co/Li in the solid grains, uniformly mixing, calcining and cooling so as to obtain lithium cobalt oxide. The method adopts the mixed acid of citric acid and hydrochloric acid as the lixivium so as to effectively separate a positive electrode material and the aluminum foil, the process is simple, and no toxic or harmful gases are generated. The first discharge capacity of recovered lithium cobalt oxide can still be 140mAh/g, and the discharge capacity after 40 times of charge and discharge circulation is not less than 90%.

The invention discloses Mn element and Zn element-doped super-paramagnetic ferrite nanoparticles and a preparation method thereof. Manganese element is added or manganese element and zinc element are simultaneously added into a face-centered cubic crystal structure of ferriferrous oxide nanoparticles by using a method of decomposing metal precursor compound at a high temperature; the magnetic performance of the prepared super-paramagnetic nanoparticles is improved by changing the doping amount and the distribution of the metal element; and primarily, the saturation magnetization is improved. The preparation method specifically comprises the following steps of: mixing acetylacetones of Fe and Mn as well as Zn with 1,2-hexadecanol; performing high-temperature decomposition in high-boiling-point solvent by taking oleic acid and oleylamine as surfactants; or performing high-temperature decomposition on composite oleate of Fe, Mn and Zn by taking the oleic acid as the surfactant; heating and preserving heat in stages in argon or nitrogen protective atmosphere to guarantee growth of nanoparticle nuclear; and cooling to room temperature after reaction is finished and settling and centrifuging to finally obtain the super-paramagnetic ferrite nanoparticles which are uniformly dispersed in normal hexane solution.

the invention discloses a composite metal oxide film preparing method based on similar hydrotalcite as former, which is characterized by the following: adopting original synthetic technology to obtain the former of similar hydrotalcite on the AAO/Al; realizing the conversion from hydrotalcite film to composite metal oxide film with structural general formula as M12+zM22+1-x-zAl3+xO1+x/2.

The invention discloses a preparation method for a bismuth ferrite BiFeO3 nanosheet. The preparation method comprises the following steps: weighing analytically pure Fe(NO3)3.9H2O and Bi(NO3)3.5H2O in a molar ratio of 1: 1 and dissolving the mixture in a ethylene glycol monomethyl ether solution to prepare a uniform solution A; dropwise adding an ammonia water solution into the solution A while stirring, wherein the mixture is fully settled, and uniformly stirring the mixture to prepare a reaction precursor; washing the prepared reaction precursor to neutral, and drying the reaction precursor to obtain dry powder; putting the dry powder and a NaOH solution into a reaction kettle, and sealing the reaction kettle; putting the reaction kettle in a reaction furnace at 120-150 DEG C, taking out a product in the reaction kettle after reaction, and washing and drying the product to obtain the bismuth ferrite BiFeO3 nanosheet. The preparation method disclosed by the invention is low in preparation temperature and energy-saving, and bismuth ferrite BiFeO3 is intact in crystallization and simple in instrument and equipment required by process control and synthesis.

The invention discloses a method for preparing monocrystal bismuth titanate nanosheet, which comprises the following steps: 1)according to a chemical reaction of Bi4Ti3O12, metering and weighing Bi2O3 and TiO2, and placing in a ceramic mortar, adding carbohydrate, grinding for 8-10 minutes in the ceramic mortar to obtain a mixture; 2)heating the obtained mixture until the mixture begins to combust, and obtaining the powder after completely combustion; and 3)washing the obtained power in the step 2) by using dilute nitric acid, removing the unreacted bismuth oxide and titanium oxide, washing to neutrality by using deionized water, and placing in a baking oven for drying to obtain the products monocrystal bismuth titanate nanosheet. The preparation method has the advantages of low temperature, saved energy, simple step, short reaction time within 10 minutes for whole combustion reaction, high efficiency, high crystallization degree of the synthesized monocrystal bismuth titanate nanosheet, and easy control of synthesis, equipment required by synthesis is simple, and a high-energy bowl mill and a high temperature furnace are not required.

The invention discloses a method for preparing an alpha-nickel sulfide and carbon nanometer rodlike composite material in an in-situ mode. The method is mainly characterized in that the method that nanometer rodlike carbon wraps nickel in an in-situ backflow vulcanizing mode is adopted to prepare the alpha-nickel sulfide and carbon nanometer rodlike composite material, and controllable adjusting on the nickel sulfide crystalline phase is achieved through the nanometer limited range action of a carbon nanometer rod . Compared with the existing synthetic technology, according to the alpha-nickel sulfide and carbon nanometer rodlike composite material synthesized through the method, the crystalline phase of the alpha-nickel sulfide is single, the alpha-nickel sulfide is distributed evenly in the carbon nanometer rod, the synthesis process is simple, repeatability is good, and a supercapacitor electrode made of the nanometer composite material has a large specific capacitance value and good circulation stability.

The invention relates to a nickel metaphosphate micro-nanomaterial as well as a preparation method and an application thereof. The micro-nanomaterial has a nano sheet array structure, and the lamellar thickness of nano sheets is less than 20nm. The nickel metaphosphate micro-nanomaterial is prepared through the preparation method comprising the following steps: dissolving a soluble nickel salt and weak base molecules in a solvent to react together with carbon cloth to obtain a nickel-containing precursor/carbon cloth complex, and then performing heat treatment on the nickel-containing precursor/carbon cloth complex and a phosphate compound in an inert atmosphere to obtain the nickel metaphosphate micro-nanomaterial. Based on a structure duplication thought, the invention adopts a two-step method to achieve preparation of a micro-nanostructure and growth of a nickel metaphosphate crystal phase, respectively, the preparation of the nickel metaphosphate micro-nanomaterial with a single crystal phase is achieved, the experiment operation is simple and safe, and scale production and application can be achieved. The prepared nickel metaphosphate micro-nanomaterial has a significant pseudocapacitance characteristic, and the specific capacitance is greater than 2000F/g when the discharge current is 1A/g, so that the nickel metaphosphate micro-nanomaterial has a good potential application prospect in the aspect of electrochemical energy storage.

The invention provides a method for preparing a chalcopyrite solar cell light absorption layer with further enhanced uniformity and a solar cell thereof to solve a technical problem in the prior art that the prepared light absorption layer has not good enough uniformity. The method for preparing chalcopyrite solar cell light absorption layer comprises the following steps of: S1, preparing a metal preset layer; S2, forming a selenium layer or a sulfur layer or a selenium sulfur layer on the surface of the metal preset layer; S3, forming a metal preset layer on the selenium layer or the sulfur layer or the selenium sulfur layer in the step S2 to form an A/B/A sandwich -shaped intermediate product; and S4, carrying out selenylation and/or sulfurization treatment on the intermediate product. By utilizing the A/B/A sandwich-shaped structure, a layer of Se or S or a SeS layer is arranged between two metal preset layers; therefore, the internal reaction can be more sufficient in the selenylation and/or sulfurization process; the uniformity is further enhanced; the crystallization is better; and a single crystalline phase is achieved.

The invention relates to a silica and zinc oxide anti-reflection film for dye-sensitized solar cells and a preparation method thereof. SiO2 with a refractive index of 1.3 is placed on the glass surface of the conductive glass FTO, and ZnO with a refractive index of 1.9 is placed on the conductive surface of the conductive glass FTO, which forms a gradient change with the refractive index of the conductive glass to improve the transmission of the conductive glass, thereby finally improving the efficiency of dye-sensitized solar cells. The anti-reflection film obtained by the invention can not only improve the transmittance of the conductive glass, but also enhance the electron transport efficiency, and is used for the quasi-solid-state dye-sensitized solar cell, and the photoelectric conversion efficiency of the cell can be increased from 4.71% to 5.63. %.