46 results about "Zno nanocrystals" patented technology

The invention discloses a zinc oxide/graphene oxide composite optical switch material and an electrochemical preparation method thereof. The composite material uses conductive glass as the substrate and is prepared by depositing a columnar zinc oxide film with thickness of 300-800 nm on an electrochemically deposited graphene oxide film with thickness of 8-30 nm through an electrochemical deposition method. The preparation method comprises the following steps: depositing a graphene oxide film with thickness of 8-30 nm by using a three-electrode system and taking indium tin oxide (ITO) as the working electrode; and then depositing columnar zinc oxide nano-crystals in a zinc nitrate solution by using the three-electrode system and taking the uniformly deposited graphene oxide film electrode as the working electrode to obtain the zinc oxide/graphene oxide composite optical switch material. The prepared composite material has the advantages of good film-forming property, uniform thickness, controllable optical and electrical properties, short photoelectric response time and the like; and the preparation process is simple, the yield is high and the period is short.

The invention belongs to the technical field of nanometer materials, and particularly relates to a zinc oxide-gadolinium-drug composite nanoparticle, and a preparation method and application thereof. The composite nanoparticle comprises a zinc oxide nanocrystal core, a polymer shell, gadolinium (III) ions modified by coordinate bonds and surface-loaded anti-cancer drug molecules, has high stability, luminescence property and magnetic relaxation rate and can be applied to cell and small animal fluorescence imaging, magnetic resonance imaging, mouse tumor treatment and the like. The preparation method includes coating a zinc oxide nanoparticle with a polymer through two copolymerization reactions, coordinating a large quantity of carboxyl groups carried by the polymer with the gadolinium (III) ions to magnetize the nanoparticle, and loading the drug molecules onto the surface of the nanoparticle. A nanoparticle drug loading platform has a good fluorescence-magnetic resonance imaging function, high drug loading rate and high release rate, is low in toxicity and is completely degraded in mouse bodies without residues, thereby having better biosecurity and medication specificity than anti-cancer drugs.

The invention relates to a preparation method of a ceramic membrane loaded zinc oxide photocatalyst, and belongs to the technical field of catalysis. A ceramic membrane acts as a carrier of the catalyst. The preparation method comprises the following steps: loading a layer of zinc oxide nano seed crystals on the surface of the ceramic membrane by adopting a dip-coating calcination method, and then preparing the ceramic membrane loaded zinc oxide photocatalyst by a hydrothermal method. The preparation method of the ceramic membrane loaded zinc oxide photocatalyst has the advantages that the photocatalyst is loaded to the surface of the ceramic membrane so as to prevent the problem of subsequent separation difficulty of the catalyst and a product. The catalyst is simple in preparation technology, is high in photocatalysis performance, and can be well applied to the catalytic degradation process.

The invention discloses a preparation method of ZnO nanocrystals. The method comprises the following steps of: dissolving the mixture between Zn(NO3)2.6H2O and any one of hexamethylene tetramine and NaOH in mixed liquor of water and organic solvent, and carrying out hydrothermal reaction to obtain the ZnO nanocrystals, wherein the mole fraction ratio of Zn(NO3)2.6H2O to hexamethylene tetramine is 1: 1, and the mole fraction ratio of Zn(NO3)2.6H2O to NaOH is 1: (5-20). The preparation method of the ZnO nanocrystals disclosed by the invention has the advantages of being simple in operation technological process, low in raw material price, low in reaction temperature, easy for large-scale production and the like, and some reference basis can be provided for the preparation of ZnO nano-materials and the indusial production of the ZnO nano-materials by the typical hydrothermal reaction. Meanwhile, according to the preparation method, after the test parameters are controlled, the ZnO nanocrystals with different shapes and sizes can be successfully prepared, the controllable synthesis of the ZnO nanocrystals can be realized, and the action mechanism and the crystal growth law of different influencing factors can be expounded.

The invention relates to a WBPU base cluster-shaped zinc oxide nano-crystal whisker antibiosis composite material and a preparation method and application thereof. In terms of parts by weight, the composite material of the invention contains 100 parts by weight of WBPU substrate and 0.3-2 parts by weight of cluster-shaped zinc oxide nano-crystal whisker antibacterial agent which undergoes ultrasonic dispersion treatment for preparing the composite material by using the blending of an ultrasonic auxiliary solution. The invention has simple preparation method and small addition amount, overcomes the problem of the inferior antibiosis effect of pure zinc series antibacterial agent and has high-efficiency, broad-spectrum and lasting antibiosis effect, as well as safe application and easy processing; the prepared composite material can be used as either an antibiosis coating directly or the masterbatch of the inorganic nano-antibiosis material of a polymer base and is applicable to the fields of food packaging, construction material, textiles, sanitary articles, daily article, household appliances, communication material and the like.

The invention relates to a carbon network supported zinc oxide nanocrystalline composite material and a preparation method and application thereof. A zinc-containing precursor is synthesized by an internal reflux method and is subjected to carbonization treatment at different temperatures in an inert atmosphere. The preparation method comprises the following steps: dissolving zinc nitrate in a mixed solution of oleic acid and oleylamine, and introducing the mixed solution into an inert atmosphere; removing residual moisture in the reactants and air in a system, raising the temperature of the system, and washing and drying a product, thereby obtaining the zinc-containing precursor; performing carbonization treatment in the inert atmosphere, thereby obtaining the carbon skeleton coated zinc oxide nanocrystalline composite material. According to the invention, a surfactant serves as a carbon source, a high-stability carbon network structure is obtained through carbonization, and zinc oxide nanocrystalline particles are uniformly inlaid in the carbon network. The method is easy to operate, is easily controlled and implemented in process and has an environment-friendly effect. The prepared ZnO/C composite material successfully overcomes the defect that zinc oxide is poor in cycle performance in the aspect of lithium ion battery application and has good application prospects.

The present invention discloses a preparation method of zinc aluminum silicate glass codoped with zinc oxide nanocrystals and rare-earth ions, which comprises the following steps of: firstly uniformly mixing zinc oxide powder, silica, alumina, potassium oxide and rare earth oxide in a mortar, melting at a high temperature, cooling the molten liquid to room temperature, and carrying out heat treatment at the temperature of 600-700 DEG C to obtain the zinc aluminum silicate glass codoped with zinc oxide nanocrystals and rare-earth ions. The preparation method provided by the invention has the advantages of simple process, low cost of raw materials, no need for special equipment and simple equipment, and the preparation process is performed in air atmosphere. The preparation method generates ZnO nanocrystals in a zinc aluminum silicate glass matrix by heat treatment for the first time; the generated nanocrystal has uniform particle sizes and diameter of about 10 nm, and changes the structure of the glass matrix; and the interaction between the generated ZnO nanocrystals and rare-earth ions helps to optimize the photoelectric properties of the optical glass.

This invention relates to a method to prepare one-dimension nanosized zincum oxide. The one-dimension nanosized zincum oxide is a kind of white powder which is generated from the mixture of zincum oxide or zincum powder and catalyst powder after discharge. The catalyst is combined from one or over two species of iron, cobalt, nickel, tin, magnesium, manganese, copper, chromium, titanium, gold, silver or their oxides. The preparation method is that, a graphite block or metal block is taken as discharge cathode. A cavity is set in a graphite bar as discharge anode, and the mixed zincum oxide or zincum powder and catalyst are filled into the cavity set in the graphite bar. The preceding discharge anode and cathode are placed into a discharge cavity and discharge is carried out in a 300Torr~1atm mixed-air environment with a discharge current of 50~130A. After discharge, the white powder deposited on the inner wall of the discharge cavity is zincum oixde crystal whiskers. The preceding mixed air is the mixture of inert gas and oxygen, with an oxygen volume fraction of 10~50%.

The present invention relates to nanometer zinc oxide crystal preparing method and apparatus, and is especially one kind of in-situ laser method and apparatus for preparing nanometer zinc oxide crystal. The apparatus includes reaction furnace, infrared thermometer, observation window, work table, metal zinc plate, annular oxygen flow, laser beam, coaxial oxygen feeder, oxygen feeding hole and vacuum pump. The preparation principle of the present invention is that the continuous heat effect of the laser heats the zinc plate to over smelting point to form zinc vapor and the zinc vapor reacts with oxygen the coaxially conveyed oxygen to generate 1D, 2D and 3D nanometer zinc oxide crystal on the zinc plate as substrate in the naturally growth direction. By means of controlling the laser power, the laser spot diameter, the laser action time and the work stable, the heating area on the zinc plate may be controlled.

Improved thin film transistor device and method, comprising transparent multi-layer thin-film transistors (TFT) disposed over a flexible polyethylene naphthalate (PEN) substrate with a nano-crystalline ZnO channel layer, and a novel HfLaO passivation layer. This device, which may be made at room temperature, has a high field-effect mobility (μ_FE) of 345 cm2/Vs, small sub-threshold slope (SS) of 103 mV/dec, high on-current/off-current (I_ON/I_OFF) of 7×10⁶, and a low drain-voltage (V_D) of 2V for low power operation. Although prior art ZnO based TFT had unimpressive performance, use of the novel HfLaO passivation layer appears to greatly improve the performance of ZnO TFT by preventing trace levels of H₂O from forming unwanted Zn—OH bonds, thus disrupting ZnO nanocrystals. At least some of the problems with prior ZnO TFT may be attributed to these Zn—OH bonds, which damage ZnO crystallinity, create charged scattering centers, and form potential barriers that degrade mobility.

The present invention provides a method for imaging a biological specimen using non-linear optical properties of certain materials. The method comprises the steps of providing an aqueous dispersion of ZnO nanocrystals; contacting a biological specimen with an aqueous dispersion comprising ZnO nanocrystals; exposing the biological specimen to input electromagnetic radiation having a wavelength of from 600 to 1500 nm; recording the nonlinear output electromagnetic radiation; and generating an image of the biological specimen based on the nonlinear output radiation.

The invention discloses a zinc oxide nanocrystalline electron transport layer and a preparation method thereof and an electronic device. The preparation method of the zinc oxide nanocrystalline electron transport layer comprises the following steps: after a zinc oxide nanocrystalline solution is coated, standing the coating for a period of time in an environment of which the humidity is greater than 0%. In the present invention, after the zinc oxide nanocrystalline solution is coated and before annealing treatment is carried out, the zinc oxide nanocrystalline coating is allowed to stand for aperiod of time in an environment with a certain humidity, and a zinc oxide nanocrystalline film is slowly crystallized under the action of water vapor, so the improvement of the conductivity of the film layer and the enhancement of electron injection are facilitated, and the reduction of the turn-on voltage of related electronic devices is facilitated; and the zinc oxide nanocrystalline film is slowly crystallized under the action of water vapor, so that the interface bonding force between the electron transport layer and the adjacent functional layer is enhanced, and the service life of related electronic devices is prolonged.

The invention provides haze-reduction paint for building wall surfaces and a preparation method. The method includes the steps: firstly, preparing pseudo-boehmite sol coated tourmaline loaded zinc oxide nano-crystalline composite spherical fine particles to serve as photocatalysts; secondly, preparing slurry from the particles, nano-silicon dioxide, nano-wollastonite, super-fine talcum powder, defoaming agents, dispersing agents, coalescing agents, preservatives and water; finally, matching the slurry, organosilicone acrylic resin and thickening agents to form the haze-reduction paint for thebuilding wall surfaces. By the aid of a pseudo-boehmite sol coated tourmaline loaded zinc oxide nano-crystalline composite material with the advantages of large specific surface, high pore volume andthe like, outward flow of catalytic active matters is avoided, the haze-reduction paint is provided with a adsorbent with excellent performance, the paint and the zinc oxide nano-crystalline are compound, high adsorption capacity of the adsorbent and visible light drive photocatalysis to degrade cationic organic pollutants, air quality is improved, the paint has remarkable effects on control of large-area haze, and further, and the paint is simple in preparation process, low in raw material cost and suitable for large-scale popularization.

The invention relates to a preparation method of magnesium-silver co-doped zinc oxide nanocrystals, belonging to the technical field of composite nanocrystalline materials. A product provided by the invention is a magnesium-silver co-doped zinc oxide nanorod. The preparation method comprises the following steps of: firstly, preparing Zn<2+>:Ag<+>:Mg<2+> microemulsion and NaOH microemulsion by using a reversed phase microemulsion system of cyclohexane/triton X-100/n-hexyl alcohol/aqueous solution; mixing and reacting the Zn<2+>:Ag<+>:Mg<2+> microemulsion with the NaOH microemulsion for a certain period of time to generate an Ag<+>/Mg<2+>-doped [Zn(OH)4]2-precusor; hydrolyzing at the temperature of 140 DEG C for 5 hours; and washing and drying to obtain the magnesium-silver co-doped zinc oxide nanocrystals. In the preparation method, ZnO:Ag-Mg nanoparticles are prepared by using a microemulsion method, Mg and Ag are taken as an active donor and an active acceptor respectively, the active donor Mg element and the active acceptor Ag element are co-doped into ZnO, the doping amount of Ag in ZnO is increased in the presence of the donor, and a lower Ag acceptor energy level is obtained,so that good p type ZnO nanoparticles are obtained.

The invention relates to a perovskite solar cell and a preparation method thereof, comprising: a transparent conductive substrate, a hole transport layer formed sequentially on the transparent conductive substrate, a perovskite light absorbing layer, and a hydrophobic long-chain high Molecular layer, an electron transport layer composed of zinc oxide nanocrystals filled in the mesh of the hydrophobic long-chain polymer layer, and a back electrode, wherein the hydrophobic long-chain polymer layer is polytetrafluoroethylene, trifluoro At least one of ethylene and vinylidene fluoride. The present invention proposes for the first time that hydrophobic long-chain polymers are introduced into the preparation of perovskite solar cells as hydrophobic materials to improve the stability of perovskite solar cells.

The invention relates to the technical field of electron transport materials, and provides a preparation method of an electron transport layer and a light emitting diode. According to the invention, the titanium dioxide nanocrystal is used as the material of the first electron transport layer, and the obtained first electron transport layer and the second electron transport layer formed by the zinc oxide nanocrystal are laminated to obtain the electron transport layer, so that the electron transport layer has relatively high conductivity; in addition, the problem that a zinc oxide electron transport layer limits materials, preparation conditions and dissolving solvents of other layer structures of the device is solved, structural optimization and preparation method optimization of the device are facilitated, and the obtained light-emitting diode has better overall performance.