221 results about "Nanoneedle" patented technology

Exemplary embodiments provide a scalable process for the growth of large scale and uniform III-N nanoneedle arrays with precise control of the position, cross sectional shape and/or dimensions for each nanoneedle. In an exemplary process, a plurality of nanoneedle array can be formed by growing one or more semiconductor material in a plurality of patterned rows of apertures with a predetermined geometry. The plurality of patterned rows of apertures can be formed though a thick selective nanoscale growth mask, which can later be removed to expose the plurality of nanoneedle arrays. The plurality of nanoneedle arrays can be connected top and bottom by a continuous coalesced epitaxial film, which can be used in a planar semiconductor process or be further configured as a photonic crystal to improve the output coupling of nanoscale optoelectronic devices such as LEDs and/or lasers.

The present disclosure provides a catalyst-free growth mode of defect-free Gallium Arsenide (GaAs)-based nanoneedles on silicon (Si) substrates with a complementary metal-oxide-semiconductor (CMOS)-compatible growth temperature of around 400° C. Each nanoneedle has a sharp 2 to 5 nanometer (nm) tip, a 600 nm wide base and a 4 micrometer (μm) length. Thus, the disclosed nanoneedles are substantially hexagonal needle-like crystal structures that assume a 6° to 9° tapered shape. The 600 nm wide base allows the typical micro-fabrication processes, such as optical lithography, to be applied. Therefore, nanoneedles are an ideal platform for the integration of optoelectronic devices on Si substrates. A nanoneedle avalanche photodiode (APD) grown on silicon is presented in this disclosure as a device application example. The APD attains a high current gain of 265 with only 8V bias.

The invention discloses a gas-sensitive sensor based on cobaltosic oxide nanoneedle array as well as a preparation method thereof. The sensor structurally comprises an insulation substrate, a comb-shaped crossed electrode layer and a cobaltosic oxide gas-sensitive sensing layer which is a cobaltosic oxide nanoneedle array from bottom to top in sequence. According to the preparation of the gas-sensitive sensor based on water thermal reaction, the water solution used in the water thermal reaction contains cobalt salt, bonding agents and alkaline reactant; according to the gas-sensitive sensor provided by the invention, the cobaltosic oxide nanoneedle array is taken as the gas-sensitive sensor; the device is simple in structure, and the performance is superior, and the nanoneedle has a large specific surface area and electron mobility, and is beneficial to improving the flexibility of the gas-sensitive sensor, the best working temperature is reduced to be 130 DEG C, the preparation method is simple, the cost is low, and the difficulty of dispersing or operating nano materials is avoided; the prepared gas-sensitive sensor is small in performance difference, and is suitable for industrial mass production.

A preferred embodiment of the invention provides an ultra-soft atomic force microscope device that has a nanoneedle cantilever that terminates in a smaller diameter nanofiber tip. Deflection of the nanoneedle cantilever is measured directly by a laser Doppler vibrometer. The invention simultaneously provides a very low mass nanoneedle cantilever arm with a very small diameter nanofiber tip, while being able to image the vibration and displacement. An AFM device of the invention simultaneously provides a ultra low mass and soft cantilever, the ability to accurately and directly measure vibration and deflection of the very small diameter nanoneedle cantilever with the laser Doppler vibrometer, and a sharp nanofiber tip that provides sub nanometer resolution.

The invention discloses a preparing method of ZnO nanometer structure etched by sulfourea solution; which comprises the following steps: synthesizing ZnO nanometer comb-shaped structure and nanometer bar through traditional heat-growth method; etching through sulfourea solution; preparing ZnO nanometer needle-tube structure and nanometer band shaped structure; dissolving sulfourea in the deionized water to proceed reversible reaction to produce weak hydrosulfuric acid. The reaction formula is that ZnO+H+-Zn++H2O to realize bottom-up and top-down ZnO nanometer structure. The invention is convenient to control diameter of nanometer line and thickness with low cost, which is compatible with micro-electronic technology.

The invention relates to a preparation method and application of a self-supporting transition metal compound-based multilevel structure electrode material and belongs to the technical field of clean energy preparation. A flexible carbon cloth is selected as a self-supporting substrate for the reason that the flexible carbon cloth has excellent electrical conductivity, can provide a very large surface area and serve as an efficient current collector; next, a vertically-arranged NiCo2S4 nanoneedle array is synthesized through one step of a hydrothermal reaction, after two steps of the hydrothermal reaction, a NiCo2S4 and carbon cloth composite material is obtained and further used as a substrate of the next step; then the NiCo2S4 and carbon cloth composite material is loaded with an ultrathin NiCo-LDH nanosheet through a simple and convenient electrodepositing method; and after the steps are finished, the self-supporting transition metal compound-based multilevel structure electrode material is successfully prepared. The preparation method is simple in step, the cost is low, environmental friendliness is achieved, the process can be controlled, and the preparation method is suitablefor industrial large-scale production manufacturing; the relevant raw material of the method is free of poison, environmentally friendly, low in price, easy to obtain and rich in reserve volume; and the obtained product is excellent is property and stable in function.

The invention relates to a method for controlling morphology of graphene coated nano-titanium dioxide, a product prepared by the method and an application of the method, and belongs to the new technical field of a carbon quantum dot application and the technical field of a chemical power supply. The graphene coated nano-titanium dioxide of different morphological structures is obtained through control according to different carbon quantum dot concentrations, carbon quantum dots are taken as a morphological additive for inducing titanium dioxide nanocrystalline to grow into a one-dimensional nanoneedle structure, and further the titanium dioxide nanocrystalline is self-assembled into three-dimensional nano-flower-shaped structure. According to the graphene coated titanium dioxide of the nano-flower-shaped structure obtained by the method, the specific capacity of the titanium dioxide is increased, moreover, the conductivity of the graphene coated nano-titanium dioxide is greatly improved, high energy density and good cycling stability are presented in a sodium storage aspect, the graphene coated nano-titanium dioxide is characterized in simple preparation technology and low raw material cost and is applicable to commercial production.

The invention discloses a preparation method of monodispersed selenium doped nano hydroxyapatite. The method is as below: adding soluble calcium salt, soluble phosphate salt and selenite in a mixed system of polyethylene glycol, ethanol and oleic acid; and conducting one-step hydrothermal reaction to obtain selenium-doped nano hydroxyapatite with good dispersion. By controlling the amount of selenate radical, nanorods and nano needles selenium-doped hydroxyapatite can be prepared. The hydroxyapatite nanorod or nanoneedle prepared by the invention can be used for repairing material, coating material and plastic filling material for patient bone defect, and has good application prospect.

The invention discloses a method for preparing a germanium cathode material on a nickel nanoneedle conical array. The preparation method comprises the following steps: firstly preparing the nickel nanoneedle conical array with a certain height by utilizing a water solution electrodeposition method on a nickel basal body, then preparing a germanium cathode material by utilizing an ionic liquid electrodeposition method in an anaerobic and hydrophobic environment, assembling a battery after carbon spraying treatment, and testing the electrochemical performance of the battery. The ionic liquid electrodeposition method is utilized on the nickel nanoneedle conical array for preparing the germanium cathode material with high specific capacity, long cycle life and high coulombic efficiency; during the ionic liquid electrodeposition process, the current density is low, and prepared germanium films are uniform; moreover, the prepared material comprises nano-sized particles, so that pulverization during the material cyclic process is reduced, the foundation area of the prepared cathode material and the prepared basal body (nickel nanoneedle conical array) is large, the binding force is good, and the preparation method is simple in process and convenient to operate.

Pesudocapacitive electrodes having improved electrochemical properties for energy storage systems, and methods for their manufacture. The pseudocapacitive electrode may include a porous substrate and a nanoscale structure having an array of nanoneedles or an array of nanopetals located on the substrate. The nanoscale structure includes a bi- or tri-metal oxide or a bi- or tri-metal hydroxide.

The invention belongs to the field of terahertz imaging technologies, relates to a modulation device in the related field of terahertz imaging, and in particular provides an optical control terahertz wave amplitude modulator based on a silicon nanoneedle. The optical control terahertz wave amplitude modulator comprises a semiconductor laser, an optical fibre, an optical fibre modulator and a terahertz amplitude modulation structure; laser generated by the semiconductor laser enters the optical fibre modulator through optical fibre coupling; the optical control terahertz wave amplitude modulator is characterized in that the terahertz amplitude modulation structure is composed of a silicon-based bottom layer and a silicon nanoneedle tip array on the surface; and the optical fibre modulator outputs modulated laser incident to the surface of the silicon nanoneedle tip array. According to the optical control terahertz wave amplitude modulator disclosed by the invention, a dual-layer structure including the silicon nanoneedle tip array and a high-resistivity silicon/intrinsic silicon layer is adopted; the silicon nanoneedle tip array has the gradient change of a refractive index on the surface of high-resistivity silicon/intrinsic silicon; reflection of terahertz wave and pumping laser can be reduced simultaneously; the insertion loss of the device is obviously reduced; the pumping laser utilization rate is increased; and the device has relatively high modulation depth under relatively low pumping laser power.

Provided are methods and systems for high resolution imaging of a material immersed in liquid by scanning probe microscopy. The methods further relate to imaging a material submersed in liquid by tapping mode atomic force microscopy (AFM), wherein the AFM has a microfabricated AFM probe comprising a nanoneedle probe connected to a cantilever beam. The nanoneedle probe is immersed in the liquid, and the rest of the AFM probe, including the cantilever beam to which the nanoneedle probe is attached, remains outside the liquid. The cantilever is oscillated and the nanoneedle probe tip taps the material to image the material immersed in liquid. In an aspect, the material is supported on a shaped substrate to provide a spatially-varying immersion depth with specially defined regions for imaging by any of the methods and systems of the present invention.

The invention application discloses a preparation method of a material with zinc oxide nanoneedles generated at the top of a zinc oxide (ZnO) nanorod array. The method comprises: adding ZnNO3.6H2O and hexamethylenetetramine (HMT) into a block type polyether Pluronic-F127 surfactant so as to obtain a precursor solution; suspending a substrate coated with ZnO seed crystals in the above solution invertedly, conducting sealing, then placing the solution into a baking oven at a temperature of 90-110DEG C for 1-50h, and leaving the solution to cool naturally; subjecting the obtained sample to washing by deionized water and absolute alcohol, then carrying out drying and calcination at a temperature of 450DEG C, thus obtaining a finished product. In the invention, a solution method that is easy to realize and simple to operate is employed to prepare a ZnO nanostructure with a special appearance. In the structure, the nanorods have a diameter of 100-200nm, and a length-diameter ratio of 30-40, while the top nanoneedles have a diameter of 20-40nm and a length-diameter ratio of 2-110. The method of the invention has the advantages of low preparation cost, simple operation process, good repeatability, short reaction period, and adjustable appearance.

The present invention relates to SPM nanoprobes and the preparation method thereof, more particularly, to SPM nanoprobes comprising a spheroid deposit capped-nanoneedle bonded to one end of a mother tip, wherein the spheroid deposit is formed by particle beam induced deposition and is characterized in that the ratio of the diameter of the spheroid deposit to that of the nanoneedle is in the range of 1.5 to 8.5. The SPM nanoprobe according to the present invention is capable of imaging or measuring an irregularly curved or complicated surface, pattern and/or a frictional or adhesive force thereof and controlling size of a spheroid deposit formed at the end portion of nanoneedle and the ratio of the diameter of the spheroid deposit to that of the nanoneedle arbitrarily.

The invention discloses a hot water non-stick surface structure and a preparation method thereof. The super-hydrophobic interface structure comprises a nano cone array structure formed on the surface of a substrate, wherein the nano array structure comprises a plurality of nano protrusions arranged in an array manner; at least the top of the nano protrusion is provided with a conical structure; the distance between two adjacent nano protrusions is 50-500nm; the top diameter of the nano protrusions is 1-200nm; and the surface of the nano array structure is modified with low surface energy substances. The preparation method is mainly implemented by virtue of a chemical bath deposition method. The super-hydrophobic surface structure disclosed by the invention has good hot water non-stick properties, non-stick impact and instantaneous rebound of hot water drops or hot water flow can be realized, the preparation process is easy to operate and control, any expensive equipment is not needed, and the super-hydrophobic surface structure is low in consumption, environment-friendly, high in reproducibility and short in period, can be prepared in large area and has excellent industrial application prospects.

A process or in-situ preparing the nanoneedles of three-element NaV6O15 monocrystal in large scale by in-situ reaction-crystallizing-etching method includes such steps as hydrothermal reaction between V2O5 powder, the aqueous solution of poly(styrene-alt-maleic acid, sodium salt (PSMA-Na) and catalyst HF at 120-200 deg.C, separating product, washing and distilled water and then absolute alcohol, and vacuum drying. It is possible to use sodium polystyrenesulfonate and sodium polyacrylate to replace PSMA-Na.