222 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.

In one embodiment, a method is provided for the manufacture of a nano-sensor array. A base having a sensing region is provided along with a plurality of nano-sensors. Each of the plurality of nano-sensors is formed by: forming a first nanoneedle along a surface of the base, forming a dielectric on the first nanoneedle, and forming a second nanoneedle on the dielectric layer. The first nanoneedle of each sensor has a first end adjacent to the sensing region of the base. The second nanoneedle is separated from the first nanoneedle by the dielectric and has a first end adjacent the first end of the first nanoneedle. The base is provided with a fluidic channel. The plurality of nano-sensors and the fluidic channel are configured and arranged with the first ends proximate the fluidic channel to facilitate sensing of targeted matter in the fluidic channel.

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.

In one embodiment, a method is provided for the manufacture of a nano-sensor array. A base having a sensing region is provided along with a plurality of nano-sensors. Each of the plurality of nano-sensors is formed by: forming a first nanoneedle along a surface of the base, forming a dielectric on the first nanoneedle, and forming a second nanoneedle on the dielectric layer. The first nanoneedle of each sensor has a first end adjacent to the sensing region of the base. The second nanoneedle is separated from the first nanoneedle by the dielectric and has a first end adjacent the first end of the first nanoneedle. The base is provided with a fluidic channel. The plurality of nano-sensors and the fluidic channel are configured and arranged with the first ends proximate the fluidic channel to facilitate sensing of targeted matter in the fluidic channel.

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 radiation detector has an electron emitter that includes a coated nanostructure on a support. The nanostructure can include a plurality of nanoneedles. A nanoneedle is a shaft tapering from a base portion toward a tip portion. The tip portion has a diameter between about 1 nm to about 50 nm and the base portion has a diameter between about 20 nm to about 300 nm. Each shaft has a length between about 100 nm to about 3,000 nm and an aspect ratio larger than 10. A coating covers at least the tip portions of the shafts. The coating exhibits negative electron affinity and is capable of emitting secondary electrons upon being irradiated by radiation. The nanostructure can also include carbon nanotubes (CNTs) coated with a material selected from the group of aluminum nitride (AlN), gallium nitride (GaN), and zinc oxide (ZnO). The detector further includes an electron collector positioned to collect electrons emitted from the electron emitter and to produce a signal indicative of the amount of electrons collected, and a signal processor operatively connected to the electron collector for processing the signal to determine a characteristic of the radiation. The detector can be used to detect radiations of changed particles or light such as X-ray.

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 present invention is concerned with a system and method for introducing a substance into cells. The system has an assembly including a plurality of elongate non-hollow nanoneedles forming a nanoneedle array or patch for delivering the substance into the cells, at least some of the nanoneedles have a non-uniform diameter with a wider upper end, a narrower lower end for penetration into the cells and a length from substantially 200 nm to 100 um. The lower end has a diameter from substantially 20-436 nm. Adjacent nanoneedles are spaced apart by substantially 5-50 um. The nanoneedles are made from a material selected from the group consisting of diamond, cubic boron nitride, carbon nitride, boron nitride, boron carbon nitride, metal borides and essentially boron materials, allowing the nanoneedles to maintain sufficient thinness and yet adequate rigidity during penetration. The nanoneedles are applied onto the cells grown on substrates at a preferred rate from 1 to 5 m / s. Alternatively, the nanoneedles are applied onto the cells grown on substrates by centrifugation force from 0.5 to 10 nN. Yet alternatively, the cells suspended in a fluid are applied to the nanoneedle array at a rate of 1 to 10 m / s.

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.

A radiation detector has an electron emitter that includes a coated nanostructure on a support. The nanostructure can include a plurality of nanoneedles. A nanoneedle is a shaft tapering from a base portion toward a tip portion. The tip portion has a diameter between about 1 nm to about 50 nm and the base portion has a diameter between about 20 nm to about 300 nm. Each shaft has a length between about 100 nm to about 3,000 nm and an aspect ratio larger than 10. A coating covers at least the tip portions of the shafts. The coating exhibits negative electron affinity and is capable of emitting secondary electrons upon being irradiated by radiation. The nanostructure can also include carbon nanotubes (CNTs) coated with a material selected from the group of aluminum nitride (AlN), gallium nitride (GaN), and zinc oxide (ZnO). The detector further includes an electron collector positioned to collect electrons emitted from the electron emitter and to produce a signal indicative of the amount of electrons collected, and a signal processor operatively connected to the electron collector for processing the signal to determine a characteristic of the radiation. The detector can be used to detect radiations of changed particles or light such as X-ray.

The invention relates to a high- hydrophobic material based on a surface nano array structure and a preparation method thereof, belonging to the technical field of a nano material; the high- hydrophobic material comprises a nano needle array and a hydrophobic film; wherein the hydrophobic film is adhered on the surface of the nano needle array; the nano needle array comprises a plurality of nano needles which grow longitudinally, and are vertical to a metal base material and arranged compactly. Proved by hydrophobic experiment, the contact angle of the high- hydrophobic material is higher than that of the common hydrophobic material by 50%.

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.

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.

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 provides a manganese cobalt oxide hollow microsphere material and a preparation method. The preparation method comprises the following steps: dissolving Mn(NO3)2 and Co(NO3)2.6H2O in deionized water, adding with anhydrous ethanol, and uniformly mixing the anhydrous ethanol and the deioinzed water; adding urea into the solution, transferring the mixed solution into a hydrothermal reaction kettle, and facilitating the reaction; centrifugally separating precipitates, washing the precipitates by utilizing deionized water and alcohol, and then drying the precipitates; and placing the precipitates in a muffle furnace, heating the muffle furnace to 600 DEG C, preserving the heat for 4 to 6 hours, and calcining the precipitates to obtain the hollow microsphere material assembled by manganese cobalt oxide nanoneedles. The diameter of the prepared manganese cobalt oxide nanoneedle is less than or equal to 30nm, and the diameter of the hollow microsphere is micron-sized (less than or equal to 6 micrometers). The manganese cobalt oxide hollow microsphere material is used as a lithium ion battery anode material, due to the special hollow structure, the cycling performance of the lithium ion battery can be improved, the performance is tested under the current density of 50 to 200 mAg<-1>, the primary discharging capacity can reach more than 1400mAhg<-1>, and the specific capacity still reach more than 750mAhg<-1> after the lithium ion battery is cycled for 25 times.

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 invention belongs to the technical field of electromagnetic function materials, and particularly provides a terahertz wave broadband absorbing material based on silicon nanoneedles, which aims at overcoming the defects of narrow absorbing bandwidth, complicated manufacturing technology, poor device stability and high preparation cost of the existing terahertz wave absorbing device. The terahertz wave broadband absorbing material comprises a silicon nanoneedle array and a silicon substrate, wherein the silicon nanoneedle array consists of a plurality of silicon nanoneedles which are uniformly distributed on the silicon substrate; the silicon nanoneedles are vertically arranged at the surface of the silicon susbtrate; the silicon nanoneedle array and the silicon substrate are made of the same material, and respectively adopt n or p type heavily-doped semiconductor silicon, and the resistivity is smaller than or equal to 0.1ohm cm. The terahertz wave broadband absorbing material manufactured by the silicon nanoneedle array structure has the advantages that the structure is simple, and the absorbing rate of terahertz wave reaches 90% within the range of 0.2 to 1.2Thz; by adopting a simple metal-assisted chemical etching method, the preparation technology is simple, and the cost is low.

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.

The invention relates to an in-situ preparation method of multi-grade carbon based iron nickel hydroxide and a product thereof and application. The method is characteirzed in that a polypyrrole nanowire / needle array grown in-situ on a carbon fabric by an electrochemical method and then is thermally processed to obtain the multi-grade carbon based needle shaped nanowire / needle array utilizing the carbon fabric as a substrate; and then the iron nickel hydroxide is loaded in situ. The method is simple, and low in cost; the prepared multi-grade carbon based nano needle / wire array is high in specific area controllable in appearance, high in oxygen evolution catalyzing performance, and widely applicable to the fields of energy storage and conversion.

In one embodiment, the present invention provides the description of an inexpensive and disposable handheld device for detecting Circulating tumor cells (CTC) in blood called a handheld CTC detector (HCTCD). The HCTCD is capable of detecting less than 1 CTC per milliliter. The HCTCD consists of a dense array of high aspect ratio freestanding metallic nanoneedles, functionalized with antibodies that integrated within a microfluidic device and selectively capture and count (using electrical signal detection) the CTCs. By selecting a right functionalization protocol for the nanoneedles array, the HCTCD can be used for selective capturing a variety of rare cells that are mixed in human fluids.

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.

The invention is concerned with one dimension CuO Nano-needle / Cu substrate material and the application in dye solar cells. The material is produced with pulse electrolysis deposition process. Electrolysis deposit one layer of nanocrystalline Cu film on Cu substrate, put this film into heating stove to get one dimension CuO Nano-needle material under 750+ / -50 DEG C for 1 to 2 hours. Take the one dimension CuO Nano-needle / Cu substrate material as cathode material to solar cell with TCO Conducting glass / TiO2 nanocrystalline / dry / CuO Nano-needle / Cu substrate, and test its efficiency of light to electricityeta. For the work function of CuO(Phi=5.3eV) is close to Pt(Phi=5.65eV), and P type of CuO has high hole mobility (0.1cm<2>V<-1>S<-1>), so it can be used as cathode material to solar cell instead of Pt to greatly reduce the cost, for better application and spread of solar cell.

The invention discloses an activated graphene / needle-shaped nickel hydroxide nanocomposite material and a preparation method thereof, and belongs to the technical field of a capacitor electrode material. According to the preparation method, graphene prepared by an oxidation-reduction method is taken as a raw material, KOH or NaOH is taken as an activating agent to prepare the activated graphene, and nanometer needle-shaped nickel hydroxide is loaded on the surface of the activated graphene to prepare the activated graphene / needle-shaped nickel hydroxide nanocomposite material. The activated graphene has very high specific area, and the nanometer needle-shaped nickel hydroxide is uniformly loaded on the surface of the activated graphene. The supercapacitor electrode prepared from the composite material has relatively high specific capacity and energy density and excellent cycle stability.

The invention relates to a pine needle-shaped nickel-cobalt-copper basic carbonate nano composite material as well as a preparation method and application thereof. The nano composite material is in apine needle shape and is composed of copper hydroxide nanorods and nickel-cobalt-copper basic carbonate nanoneedles arranged on the copper hydroxide nanorods, wherein the nickel-cobalt-copper basic carbonate is a mixture of copper-nickel basic carbonate and copper-cobalt basic carbonate. The preparation method comprises the following steps of carrying out chemical etching on a foam copper sheet togrow a copper hydroxide nanorod, and then growing a nickel-cobalt-copper basic carbonate nanoneedle on the copper hydroxide nanorod through hydrothermal reaction to obtain the pine needle-shaped nickel-cobalt-copper basic carbonate nano composite material. The nano composite material is excellent in electrochemical performance, relatively higher in area specific volume and good in rate capability, is excellent in electrochemical performance when being used for an asymmetric supercapacitor, and has the ultra-long service life, the preparation method is simple, the raw materials are easy to obtain, and the cost is low.