102 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.

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; and
  • a 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.

Design and preparation of a smart system, including a hydrophilic polymer nanoparticle as a core material and a hydrophilic-hydrophobic block copolymer as a coating nanolayer for use in a smart core-shell nanostructure flooding during enhanced oil recovery (EOR) process. The hydrophilic polymers are prepared by an inverse emulsion method. The central core of this nanostructure includes hydrophilic polymer. The nanolayer can be a surfmer. The binary properties of the shell and hydrophilic polymers increase the water viscosity in the water-oil interface and enhance oil recovery.

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.

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 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 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 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.