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2281 results about "Dimethyl formamide" patented technology

High-yield preparing method for inorganic halogen perovskite fluorescent quantum dots at room temperature

The invention discloses a high-yield preparing method for inorganic halogen perovskite fluorescent quantum dots at the room temperature. The fluorescent quantum dots are CsPbX3, wherein X is equal to AxB1-x and is larger than or equal to 0 and smaller than or equal to 1, and A and B are any one of Cl, Br and I. The method comprises the following steps that firstly, lead halide and cesium halide are dissolved into dimethyl formamide, surfactant oleylamine and oleic acid are added, the mixture is stirred until complete dissolution, and a precursor solution is obtained; secondly, the precursor solution is dripped into a poor solvent at the speed of 0.08-0.13 mL/s and stirred evenly at the uniform speed, and the inorganic halogen perovskite fluorescent quantum dots CsPbX3 are obtained. The preparing method is implemented at the room temperature, protection gas is not needed, equipment is simple, mass production can be achieved, and full visible light band shining can be achieved by selecting halogen and adjusting the proportion of halogen. The full width at half maximum of the inorganic halogen perovskite fluorescent quantum dots prepared through the preparing method ranges from 16 nm to 39 nm, the fluorescence quantum efficiency is close to 90%, and the inorganic halogen perovskite fluorescent quantum dots can be stably stored for more than three months, and can be used in the field of solar cells, lasers, light detectors, light-emitting diodes and the like.
Owner:NANJING UNIV OF SCI & TECH

Preparation and application of perovskite nanowires, photoelectric detector and solar cell

The present invention discloses preparation and application of perovskite nanowires, a photoelectric detector and a solar cell. A preparation method of the perovskite nanowires comprises: (1) dissolving iodinated methylamine and haloid of lead in dimethyl formamide solution to prepare lead-halide perovskite precursor solution; (2) carrying out ultraviolet and ozone treatment on a substrate for at least 30 minutes to obtain the substrate with hydrophilcity; (3) roughening the edge of one end of the substrate and dispensing or spraying the lead-halide perovskite precursor solution on the substrate; and then jacking up the roughened edge end to enable an included angle to be formed between the substrate and the horizontal plane, carrying out standing and heating the substrate to obtain the lead-halide perovskite nanowires. According to the present invention, the lead-halide perovskite nanowires which are uniform in density and are ordered in direction can grow in a selective region of the substrate; and moreover, the grown lead-halide perovskite can be well combined with other parts or preparation methods of existing devices (for example, the lead-halide perovskite can be combined with other parts of the existing devices into the photoelectric detector, the solar cell and the like), so that performance of the devices are improved.
Owner:HUAZHONG UNIV OF SCI & TECH

Metal/grapheme nanocomposite and preparation method thereof

The invention discloses a metal/grapheme nanocomposite and a preparation method thereof. The method comprises a photo-reduction one-step method and a photocatalytic reduction one-step method. The photo-reduction one-step method comprises the steps as follows: a grapheme oxide and metal complex acid or inorganic salt and a photo-reduction agent are mixed at the room temperature or under the condition of an ice-water bath, and under the light condition, organic negative hydrogen donors reduce metal ions and the grapheme oxide, so that a product is obtained. One approach of the photocatalytic reduction one-step method comprises the steps as follows: the grapheme oxide and the metal complex acid or salt are mixed in a DMF (dimethyl formamide) water solution containing a reducing agent, a metal ligand and a photocatalyst or in a water solution, catalysis is performed through the catalyst under the light condition, and at the same time, the reducing agent reduces the metal ions and the grapheme oxide, so that a product is obtained; and the other approach of the photocatalytic reduction one-step method comprises the steps as follows: the grapheme oxide and a metal organic complex are mixed in a DMF water solution containing the reducing agent and the photocatalyst or in a water solution, then catalysis is performed through the catalyst under the light condition, and the reducing agent reduces the metal organic complex and the grapheme oxide, so that a product is obtained.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Method for preparing G/Sn/PAN-base carbon nanometer fiber membrane

The invention discloses a method for preparing a G/Sn/PAN-base carbon nanometer fiber membrane. The method for preparing the G/Sn/PAN-base carbon nanometer fiber membrane includes: 1) preparing spinning solution, to be more specific, weighing polyacrylonitrile, nanometer tin powder and graphene nanometer film according to certain mass ratio, blending and dissolving in N-N dimethyl formamide, and stirring to obtain the uniformly dispersed electrostatic spinning solution; b) electrostatic spinning, to be more specific, carrying out electrostatic spinning on the electrostatic spinning solution of the step a) to obtain a graphene/tin/polyacrylonitrile nanometer fiber membrane; c) pre-oxidizing, to be more specific, pre-oxidizing the graphene/tin/polyacrylonitrile nanometer fiber membrane of the step b) in air atmosphere to obtain the pre-oxidized nanometer fiber membrane; d) carbonizing, to be more specific, carbonizing the pre-oxidized nanometer fiber membrane in argon atmosphere to obtain the G/Sn/PAN-base carbon nanometer fiber membrane. The method for preparing the G/Sn/PAN-base carbon nanometer fiber membrane is easy to operate, the graphene coats the nanometer fiber well; the G/Sn/PAN-base carbon nanometer fiber membrane has advantages of large specific surface area, high porosity, and high electrical conductivity and so on, and has broad expanding space.
Owner:ZHEJIANG SANZHI TEXTILES

Zinc and copper bi-metal organic framework material and preparation method and application thereof

The invention belongs to the technical field of metal organic framework materials, and discloses a zinc and copper bi-metal organic framework material and a preparation method and application thereof. The preparation method comprises the steps that 1, soluble copper salt, soluble zinc salt and trimesic acid are added to mixed solvent of N,N'-dimethyl formamide, water and ethyl alcohol, even stirring and ultrasonic treatment are conducted, and reaction liquid is obtained; 2, the reaction liquid obtained in the first step is transferred into a polytef reaction kettle for a hydrothermal reaction, and a roughly prepared zinc and copper bi-metal organic framework material is obtained; 3, the material obtained in the second step is washed through the N,N'-dimethyl formamide firstly and then soaked through ethyl alcohol solvent, and the purified zinc and copper bi-metal organic framework material is obtained after activation is conducted. According to the zinc and copper bi-metal organic framework material, the framework structure of an original copper-based organic material is reserved; meanwhile, the prepared material is large in specific surface and developed in micro-pore structure and has higher adsorption capacity to low-concentration congo red dye molecules in water.
Owner:SOUTH CHINA UNIV OF TECH

Method for preparing silicon dioxide-silver nanometer composite microspheres

The invention relates to a method for preparing silicon dioxide-nanometer noble metal composite microspheres. The method comprises the following steps of: 1) preparing modified silicon dioxide colloid microspheres; 2) dispersing the modified silicon dioxide colloid microspheres in dimethyl formamide (DMF), adding an organic monomer and an initiator for reacting, performing centrifugal separation, washing, and drying to obtain silicon dioxide/polymer composite microspheres; and 3) dispersing the silicon dioxide/polymer composite microspheres in deionized water, dripping a AgNO3 solution, stirring, dripping a reducing agent dropwise, stirring, performing centrifugal separation, washing and drying to obtain the silicon dioxide-silver nanometer composite microspheres. The method has the advantages that the silicon dioxide metal composite material which is high in dispersion degree and firm in combination, and of which the metal ion diameter is small can be obtained under the mild reaction condition; and the specific surface areas of the noble-metal-loaded silicon dioxide composite particles have adjustability. The method can be used for preparing the silicon dioxide silver-loaded nanometer particles, and also can be used for loading other noble metal nanometer particles by silicon dioxide.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

Simple green synthesis method of nitrogen-doped carbon quantum dots

The invention discloses a simple green synthesis method of nitrogen-doped carbon quantum dots. Konjac flour, serving as a carbon source, is subjected to pyrolysis in air and solvent extraction to obtain the nitrogen-doped carbon quantum dots. The synthesized nitrogen-doped carbon quantum dots are easily dissolved in solvents such as ethanol, N,N-dimethyl formamide and dimethyl sulfoxide and can be ultrasonically dispersed in water, the particle size is 0.3-2.4 nm, the highest fluorescence quantum yield is 22%, and the yield is 3%-5%. The nitrogen-doped carbon quantum dots can emit blue light, green light and red light respectively under the excitation of ultraviolet light, blue light and green light, and the fluorescence property of the nitrogen-doped carbon quantum dots can be adjusted through the excitation light wavelength, concentration and pH value. The method is simple and easy to operate and can be applied to large-scale synthesis of carbon quantum dots while the cost is low. The synthesized nitrogen-doped carbon quantum dots can be applied to the development of living cells in vitro and the preparation of stimulus response materials, and have broad application prospects in multiple fields of biomarkers, biomedical imaging, bio-development, drug screening and detection, biochips, biosensing and the like.
Owner:ANHUI UNIVERSITY
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