103 results about "Core shell nanostructure" patented technology

Matrixes doped with semiconductor nanocrystals are provided. In certain embodiments, the semiconductor nanocrystals have a size and composition such that they absorb or emit light at particular wavelengths. The nanocrystals can comprise ligands that allow for mixing with various matrix materials, including polymers, such that a minimal portion of light is scattered by the matrixes. The matrixes of the present invention can also be utilized in refractive index matching applications. In other embodiments, semiconductor nanocrystals are embedded within matrixes to form a nanocrystal density gradient, thereby creating an effective refractive index gradient. The matrixes of the present invention can also be used as filters and antireflective coatings on optical devices and as down-converting layers. Processes for producing matrixes comprising semiconductor nanocrystals are also provided. Nanostructures having high quantum efficiency, small size, and / or a narrow size distribution are also described, as are methods of producing indium phosphide nanostructures and core-shell nanostructures with Group II-VI shells.

Nanocomposite photovoltaic devices are provided that generally include semiconductor nanocrystals as at least a portion of a photoactive layer. Photovoltaic devices and other layered devices that comprise core-shell nanostructures and / or two populations of nanostructures, where the nanostructures are not necessarily part of a nanocomposite, are also provided, as are devices including a recombination material and / or multiple electrodes. Varied architectures for such devices are also provided, including flexible and rigid architectures, planar and non-planar architectures, and the like, as are systems incorporating such devices, and methods and systems for fabricating such devices. Compositions comprising two populations of nanostructures of different materials or nanostructures and a small molecule are also described, as are doped polymer nanocomposites. Compositions useful for making nanocomposites are also described.

Matrixes doped with semiconductor nanocrystals are provided. In certain embodiments, the semiconductor nanocrystals have a size and composition such that they absorb or emit light at particular wavelengths. The nanocrystals can comprise ligands that allow for mixing with various matrix materials, including polymers, such that a minimal portion of light is scattered by the matrixes. The matrixes are optionally formed from the ligands. The matrixes of the present invention can also be utilized in refractive index matching applications. In other embodiments, semiconductor nanocrystals are embedded within matrixes to form a nanocrystal density gradient, thereby creating an effective refractive index gradient. The matrixes of the present invention can also be used as filters and antireflective coatings on optical devices and as down-converting layers. Processes for producing matrixes comprising semiconductor nanocrystals are also provided. Nanostructures having high quantum efficiency, small size, and / or a narrow size distribution are also described, as are methods of producing indium phosphide nanostructures and core-shell nanostructures with Group II-VI shells.

Exemplary embodiments provide semiconductor devices including high-quality (i.e., defect free) Group III—Nitride nanostructures and uniform Group III—Nitride nanostructure arrays as well as their scalable processes for manufacturing, where the position, orientation, cross-sectional features, length and the crystallinity of each nanostructure can be precisely controlled. A pulsed growth mode can be used to fabricate the disclosed Group III—Nitride nanostructures and / or nanostructure arrays providing a uniform length of about 0.01-20 micrometers (μm) with constant cross-sectional features including an exemplary diameter of about 10 nanometers (nm)-500 micrometers (μm). Furthermore, core-shell nanostructure / MQW active structures can be formed by a core-shell growth on the non-polar sidewalls of each nanostructure and can be configured in nanoscale photoelectronic devices such as nanostructure LEDs and / or nanostructure lasers to provide tremendously-high efficiencies. Additional growth mode transitions from the pulsed to the non-pulsed growth mode and subsequent transitions from non-pulsed to pulsed growth mode are employed in order to incorporate certain group III—Nitride compounds more efficiently into the nanostructures and form devices of the designed shape, morphology and stochiometric composition. In addition, high-quality group III—Nitride substrate structures can be formed by coalescing the plurality of group III—Nitride nanostructures and / or nanostructure arrays to facilitate the fabrication of visible LEDs and lasers.

The invention discloses and proposes a high-efficiency quantum dot light emitting diode with a self-assembly polymer hole transmission layer structure. Except a positive electrode and a negative electrode, the high-efficiency quantum dot light emitting diode comprises a three-layer structure: a hole transmission layer, a quantum dot light emitting layer and an electron transmission layer, wherein one end of the quantum dot light emitting layer is connected with the hole transmission layer, the other end of the quantum dot light emitting layer is connected with the electron transmission layer, the electron transmission layer is organic nanoparticles after doped, the hole transmission layer is formed by doping a monomer, a polymer, small-molecule, inorganic oxidized metal nanoparticles or a two-dimensional nanometer material into poly(3,4- ethylenedioxythiophene monomer), a quantum dot is quantum dots of zinc sulfide, zinc selenide, cadmium sulfide, cadmium selenide, cadmium telluride, mercury sulfide, mercury selenide, mercury telluride or core-shell nanometer structured cadmium selenide-zinc sulfide, cadmium sulfide-zinc sulfide, cadmium sulfide-zinc selenide and graphene thereof and the like, and the negative electrode is glass or polyethylene terephthalate (PET) with a layer of indium tin oxide (ITO) or fluorine-doped tin oxide (FTO) or graphene.

The present invention provides a core-shell nanostructure comprising:a hydrophobic polymeric core; anda hydrophobic polymeric shell on the core,wherein the shell comprises at least one binding site for binding at least one target agent. In particular, the nanostructure has a red-blood cell morphology.The present invention also provides a method for preparing the nanostructure and uses of the nanostructure.

The invention discloses a method for synthesis of a double-casing layer carbon nanometer hollow polyhedron by a metal-organic framework as a template and belongs to the field of novel energy and novel materials. The method comprises that a zeolitic imidazolate framework with a core-shell nanometer structure as a structure precursor is calcined at a high temperature to form the double-casing layer nanometer carbon hollow polyhedron. The cheap and easily available zeolitic imidazolate framework as a structure precursor is used for preparation of the double-casing layer carbon nanometer hollow polyhedron. The method has simple processes, is free of a template, realizes precise control of a shell structure by change of a zinc / cobalt-based zeolitic imidazolate framework ratio or calcining conditions, is environmentally friendly and can be industrialized easily. The double-casing layer carbon nanometer hollow polyhedron has a wide application prospect in the fields of energy storage, catalysis, photoelectric materials and drug transport.

The invention discloses a preparation method for a molybdenum disulfide nanometer nuclear shell nano-structure. By adopting a solvent thermal synthesis method, the preparation method specially comprises the following steps: (1) dissolving Na2MoO4.2H2O, Na2S and ascorbic acid into a mixed solvent, adding surface active agent, conducting centrifugal agitating to be evenly dispersed into the solution, and finally adjusting the pH value of the solution as 12-14 with acid; (2) agitating the solution obtained from step (1), transferring into a stainless steel reaction kettle, sealing, conducting constant-temperature reaction, cooling to room temperature to obtain reaction product; and (3) separating the reaction product, washing and drying to obtain the molybdenum disulfide nanometer nuclear shell nano-structure. The method is simple in process, and low in cost, the product prepared is high in purity and yield, has an important application in the fields of friction, photochemistry, lithium electricity and the like, and is hopefully used for large-scale industrial production.

The invention discloses a preparation method of Au@Cu2-xSe cage-like core-shell nanostructures. The preparation method comprises: 1, using sodium citrate to reduce chloroauric acid to obtain spherical gold nanoparticles; 2, by using the spherical gold nanoparticles as a template, using ascorbic acid to reduce a copper salt to obtain gold / cuprous oxide nano core-shell structures; 3, using potassium borohydride to reduce selenium powder in a strong base environment to obtain a selenium source, and mixing and reacting the obtained selenium source with the gold / cuprous oxide core-shell nanoparticles; and 4, carrying out centrifugal washing treatment, and vacuum drying treatment, and finally obtaining the gold / cuprous oxide cage-like core-shell nanostructures. The method is easy in operation, good in repeatability, and high in yield, and the prepared product is good in stability.

A method for manufacturing core-shell nanostructure is provided. A nanoparticle containing a metal is provided. The nanoparticle is capable of transforming the light energy to the thermal energy. The nanoparticle is distributed onto a first thermosetting material precursor. A second thermosetting material precursor is coated on the first thermosetting material precursor to cover the nanoparticle. The nanoparticle is irradiated by a light source to produce the thermal energy such that the first thermosetting material precursor and the second thermosetting material precursor around the nanoparticle are cured to form a material layer on the nanoparticle. The uncured portion of the first thermosetting material precursor and the uncured portion of the second thermosetting material precursor are removed.

The invention relates to a one-dimensional chainlike Au-Ag core-shell nanostructure, a self-assembly preparing method and SERS application. Nanoparticles of an Au core and Ag shell structure are synthesized through a liquid-phase synthesis method and a seed crystal growth method; the obtained nanoparticles of the core and shell structure are dispersed in a mixed solution of inorganic salt and ethyl alcohol; a certain quantity of alkaline solution is taken, and the mixed solution is added to be stirred and centrifuged to obtain the one-dimensional chainlike structure. By controlling the electrostatic mutual acting force between the core-shell nanoparticles, the one-dimensional nanometer structure of different Au core sizes and different Ag shell thicknesses is obtained through self-assembly; the method does not need the aid of any templates or surface active agents, the assembly process is simple, the Au core sizes and shell thicknesses are easy to regulate and control, products are easy to separate, the surface Raman enhancing effect of organic substance molecules is remarkable, a preparation system is green and environmentally friendly, no toxic or harmful solvent is added, prepared products are stable in performance, preparation cost is low, the application range is wide, repeatability is high, and large-scale preparation is easy.

The invention discloses a gold nano material adopting a porous tubular hollow structure and a preparation method of the gold nano material. The gold nano material is a tubular structure with cavities inside, a plurality of holes are formed in the surface of the gold nano material, the inner diameter of each hole is 50-500 nanometers, the thickness of a tube wall of each hole is 1-50 nanometers, and the length of each hole is 1-20 micrometers; the diameter of each hole in the tube wall is 1-50 nanometers, the thickness of the hole wall is 1-50 nanometers, and the hole in the wall is a two-dimensional or three-dimensional hole. According to the method, firstly, a silver nanowire is prepared with a polyol process to serve as a template, then, a silver-gold composite core-shell nano structure is obtained through reaction and washed with ultrapure water to be dispersed in water, a product is annealed at certain temperature, and a gold-silver alloy is obtained; the alloy is placed in concentrated nitric acid to be corroded for a period of time and is separated finally, and the gold nano material which is similar to macroscopic porous gold in shape and adopts the hollow tubular structure is obtained. According to the method, the process is simple and easy to operate, the repeatability is good, the cost is low, and the obtained gold nano material can be used for the field of chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, optical information storage, drug targeting carriers, photo-thermal therapy of cancer cells and the like.

A photovoltaic cell includes nanostructures formed of nanowires on a substrate, where the nanostructures include an array of three dimensional nanotrees or nanobushes with a core-shell structure having a core and one or more shells sequentially formed on the core. The core o f the core-shell structure is formed of a highly conductive metal or semiconductor, and the shell o f the core-shell structure is formed of a metal, semiconductor, or polymer, such that the core-shell structure has substantially large surface and interface area for photon energy harvesting and conversion into electricity.

The invention discloses a gold nanorod / titanium dioxide core-shell nanostructure and a one-step synthetic method of the gold nanorod / titanium dioxide core-shell nanostructure. The synthetic method comprises the steps of scattering gold nanorods in a water solution containing cetyl trimethyl ammonium bromide, adjusting the mixed solution to be alkaline, then, adding a titanium source with a low hydrolysis rate into the mixed solution to form a mixed reaction system and carrying out reaction to obtain the gold nanorod / titanium dioxide core-shell nanostructure. The gold nanorod / titanium dioxide core-shell nanostructure comprises the gold nanorods and the titanium dioxide shell layers coating the gold nanorods, and the titanium dioxide shell layers are each of a mesoporous structure. The one-step synthetic method of the gold nanorod / titanium dioxide core-shell nanostructure is simple and easy to operate, mild in reaction condition, high in reproducibility and yield, easy to control in product structure and morphology, low in cost, friendly to the environment, safe, nontoxic, very easy to popularize widely and produce industrially.

The invention provides a Cu@mSiO2 core-shell nano catalyst for preparing hydrogen from ammonia borane and hydrazine borane by hydrolysis and a preparation method of the catalyst. The catalyst is prepared by an inverted micelles method in a kettle. A core is formed by non-noble metal copper (Cu), and a core-shell nanostructure of a shell is formed by mesoporous silica (mSiO2). The catalyst is analyzed by a TEM image, the core is formed by metal Cu nano particles, and the shell is of the core-shell nanostructure of mesoporous SiO2. The catalyst has the characteristics of being small in core metal particles, clear in core-shell structure and morphology, uniform in size, large in specific surface area, excellent in activity and cycle performance, and the like, and the shell is made from mesoporous SiO2.

The invention discloses a method for preparing an Ag / ZnO core-shell nanostructure by adopting pulse laser liquid ablation and belongs to the field of material preparation. Two-step pulse laser liquid ablation is adopted, oxide layers of an Ag target and a Zn target are removed by using nitric acid, and ultrasonic cleaning is performed. The method comprises the following steps of ablating the Ag target in deionized water by using excimer laser with the wavelength of 248nm, the single pulse energy of 400mJ and the repetition frequency of 10Hz to obtain Ag colloid; ablating the Zn target in the Ag colloid by using the same laser to obtain the Ag / ZnO core-shell nanostructure. According to the method, preparation equipment is simple, the preparation is quick and safe without pollution, the surface plasma resonance absorption of the prepared Ag / ZnO core-shell nanostructure can be adjusted, and the Ag / ZnO core-shell nanostructure has other excellent photoelectric properties and has a good application prospect in the fields of optics, electrics, catalysis and the like.

The present invention relates to a sensor including a core-shell nanostructure, and more particularly, to a sensor including: a base material; a sensing part including a core-shell nanostructure that has a core including a first metal oxide and a shell including a second metal oxide formed on the core; and two electrode layers spaced from each other on the sensing part.

The present invention relates to a nanoparticle dimer in which Raman-active molecules are located at a binding portion of the nanoparticle dimer, and more particularly, to a core-shell nanoparticle dimer comprising: a gold or silver core having a surface to which oligonucleotides are bonded; and a gold or silver shell covering the core. In addition, the present invention relates to the core-shell nanoparticle dimer, to a method for preparing same, and to the use thereof.

A double-emulsion core-shell nano-structure and preparation methods thereof is provided. The double-emulsion core-shell nano-structure is a structure of an oil shell enclosing a water core. The double-emulsion core-shell nano-structure can be prepared by simply mixing and stirring to emulsify an aqueous solution of a water soluble polymer and an organic solution of hydrophobic paramagnetic nanoparticles.

The invention discloses a dielectric composite material based on paraffin-coated barium titanate nanoparticles. The preparation method comprises coating surfaces of barium titanate spherical particles having the sizes of 150-200nm with paraffin as a modifier with good film-forming properties and insulativity to obtain barium titanate@paraffin core-shell nanostructure particles, and compounding the nanostructure particles and a poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) polymer matrix so that dispersibility and compatibility of the nanostructure particles in the P(VDF-HFP) matrix are significantly improved. The percolation threshold of the paraffin-coated barium titanate / P(VDF-HFP) compound is higher than that of the barium titanate / P(VDF-HFP) compound. When the volume fraction of the paraffin-coated barium titanate nanoparticles in the compound is 50%, the dielectric constant of the compound is increased to 49.0 at 1kHz, and the loss is reduced to 0.06. When the volume fraction of the paraffin-coated barium titanate nanoparticles in the compound is 30%, the compound has an anti-breakdown electric field of 220kV / mm and has energy density of 13.85J / cm<3>.

The invention discloses a high-performance alkaline fuel cell cathode carbon catalyst and a preparation method of the high-performance alkaline fuel cell cathode carbon catalyst. The catalyst disclosed by the invention is a composite carbon material in a core-shell nanostructure, which is prepared by adulterating two elements of Fe and N, using conductive carbon black with a high-ratio surface as an inner core and coating a phthalocyanine iron shell around the inner core. The preparation method comprises the following steps of: weighing and mixing phthalocyanine iron solid powder and the conductive carbon black with the high-ratio surface according to a certain mass ratio, and then preparing to obtain a C@FePc carbon non-noble metal catalyst in the core-shell nanostructure by adopting a simple mechanical ball milling method. The catalyst disclosed by the invention has high-performance oxygen reduction reaction (ORR) catalytic activity, excellent CH3OH / CO tolerance and good stability, the cost of raw materials used in the preparation process is low, the operation is simple and convenient, and the catalyst is easy for large-scale commercialized production.

The invention discloses a preparation method of a beta-NaYF4:Yb / Tm@Cds core-shell nanostructure. The preparation method is characterized by including: dispersing water-soluble beta-NaYF4:Yb / Tm nano particles in cadmium salt aqueous solution containing hexamethylene tetramine, cetyltrimethyl ammonium bromide and ascorbic acid, and performing reaction for 6-24 hours at 80-95 DEG C to obtain beta-NaYF4:Yb / Tm@CdO core-shell nano particles; allowing the beta-NaYF4:Yb / Tm@CdO core-shell nano particles and H2S gas to react under 40-150 DEG C for 2-6 hours to obtain beta-NaYF4:Yb / Tm@Cds core-shell nano particles. The preparation method is simple to operate, simple in process requirement and suitable for large-scale industrial production.

The invention discloses a NiCo2O4@NiCo2O4 nanometer material for a super capacitor electrode and a preparation method thereof. The NiCo2O4@NiCo2O4 nanometer material is of a homogeneous core-shell nanostructure. The core structure and the shell structure are composed of NiCo2O4 nanowires, and the shell structure NiCo2O4 nanowires grow densely on the core structure NiCo2O4 nanowires. The preparation method comprises the steps: the core structure NiCo2O4 nanowires are obtained through a hydrothermal reaction method; on the core structure NiCo2O4 nanowires, the shell structure NiCo2O4 nanowires are further prepared through an electrochemical reaction method; and finally, the NiCo2O4@NiCo2O4 nanowires of the homogeneous core-shell structure are obtained. The length of the prepared NiCo2O4@NiCo2O4 nanowires can reach 2 mums, and the diameter thereof is 100-200 nm; tested in a three-electrode system and under the constant current of 10 mA / cm<2>, the area specific volume can reach 2.6 F / cm<2>; and after 1000 times of charge-discharge cycle attenuation, the specific capacitance is still larger than 90% of the original value, and the charge transfer impedance is 1.0 omega / cm<2>. The prepared homogeneous core-shell structure nanowire electrode has the advantages of high specific capacitance, good cycle performance, low charge transfer impedance, simple preparation method and low cost and the like.