106 results about "Nanoneedle" patented technology

The invention relates to a non-noble metal-based self-supporting electrode, a preparation method thereof and application of the non-noble metal-based self-supporting electrode in efficient electrolyzed water. The self-supporting electrode comprises a non-noble metal substrate layer, and a transition layer and a catalytic activity layer which are sequentially arranged on the surface of the non-noble metal substrate layer, the transition layer comprises NiFe unit cell nano particles; the catalytic activity layer comprises CoFeLDH, and the CoFeLDH is of a cactus spherical structure formed by a nano needle-shaped array; and a heterojunction interface is arranged between the transition layer containing the NiFe unit cell nanoparticles and the catalytic activity layer containing the CoFeLDH. The catalyst has low oxygen evolution overpotential and has high current density and excellent stability under the working condition, the transition layer is constructed between the catalytic active layer and the foamed nickel substrate, interface contact between the catalytic active layer and the substrate can be optimized, more uniform stress distribution and better interface adhesion can be achieved, charge transfer and mass transfer are enhanced, and the catalytic activity of the catalyst is improved. Therefore, the electrode interface stability is realized.

The invention provides a tip Raman-based metal oxide nanoparticle in-situ detection method, which comprises: S1, dispersing metal oxide nanoparticles in a nanoparticle dispersion liquid, focusing laser to the tip of a nanometer tip through an objective lens, capturing a single nanoparticle by using an optical tweezers technology, and attaching the single nanoparticle to the nanometer tip; s2, focusing Raman laser on a nano needle tip-particle interface, generating a local high-temperature field through a photo-thermal near-field coupling effect, triggering a thermal chemical reaction of nano particles, and synchronously collecting a Raman spectrum; and S3, carrying out pretreatment and characteristic peak analysis on the collected Raman signal of the Raman spectrum, and determining the reaction critical temperature and the dynamic process in combination with temperature calibration data. According to the invention, capture and accurate heating of the nanoparticles are realized through photo-thermal coupling of the optical tweezers and the needle tip, and thermal chemical reaction monitoring of the nanoparticles is realized.

The invention belongs to the field of micro-nano structures, and relates to a preparation method of a nano needle tip split ring 3D structure periodic array. According to the method, after a reflecting layer and a supporting layer are deposited on a silicon substrate, polystyrene nanospheres are self-assembled, the volume of the nanospheres is reduced through reactive ion etching, then two times of inclined magnetron sputtering are carried out, deposited precious metal is etched through a reactive ion etching machine, and the silicon substrate is obtained. And removing the nanosphere mask to obtain the 3D structure periodic array of the nanotip split ring. The method has the characteristics of simple preparation process, good uniformity, high order degree and strong repeatability, and has wide application potential in the fields of SERS (Surface Enhanced Raman Scattering), photoelectric property detection and the like.

The invention discloses a ruthenium-doped nanoneedle sheet carbon-loaded cobaltosic oxide self-supporting electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a ruthenium-cobalt precursor from a mixed solution of cobalt nitrate hexahydrate, ammonium fluoride, ruthenium trichloride and urea through a hydrothermal method, drying, and calcining in air to obtain the RCO catalyst grown on the carbon cloth. The catalyst has a nanoneedle sheet type structure, can provide a high-quality reactant transmission channel, shows excellent oxygen evolution reaction electrocatalytic activity and stability in alkali / acidic electrolyte, can be used as an efficient anode catalyst for acid and alkaline solution water electrolysis devices, and has a good market prospect.

The invention discloses a working temperature control method of a Josephson probe and a method for regulating and controlling the thickness of an Nb film, the working temperature of the Nb-based probe is increased to 7.2 K by regulating and controlling the film thickness parameter and controlling the working temperature of the probe, and the highest record of similar probes is created. According to the method for regulating and controlling the thickness of the Nb film, a four-groove quartz tube is selected as a substrate, and after ultrasonic cleaning, a nano needle tip is drawn by adopting a laser heating method, so that a needle tip structure with a clean surface and a controllable geometric structure is obtained; and horizontally fixing the prepared nano needle tip on a probe bracket, depositing a niobium film by adopting a magnetron sputtering process, and controlling the thickness of the Nb film to prepare the Josephson probe. According to the invention, the dependence of the probe on an extremely low temperature environment is obviously reduced, the limitation of the original process is broken, the available film thickness range is effectively widened, the preparation yield and the performance consistency of the probe are obviously improved, and a reliable device basis is provided for the practical development of near-field microwave imaging and quantum sensing technologies.

The invention belongs to the field of micro-nano structures, and relates to a preparation method of a single-layer disc 3D structure based on nano needle tip support. According to the method, the single-layer disc 3D structure supported by the nanometer needle tip is obtained through an electron beam thermal evaporation system, a self-assembly technology and reactive ion etching, the preparation process is simple, cost is low, repeatability is good, structural stability is good, and tolerance is high. Compared with a metasurface supported by a silicon substrate, the metasurface provided by the invention has the advantages that the transient signal oscillation modulation capability of the metasurface is greatly improved by the needle point support, the opto-mechanical conversion efficiency and the oscillation quality are remarkably improved, and the quality factor is improved by several orders of magnitude compared with that of a common silicon substrate.

The invention discloses a corrosion-resistant photovoltaic module material and a preparation method thereof, and belongs to the technical field of photovoltaic modules, zinc oxide nanoneedles grow on the surface of modified mica powder in an oriented manner to obtain zinc oxide / mica powder, and the zinc oxide / mica powder is treated by 3-aminopropyltriethoxysilane to be grafted with 2-hydroxyaniline to obtain the corrosion-resistant photovoltaic module material. Zinc oxide can cooperate with aniline to be adsorbed on the metal surface to form a compact hydrophobic protection layer, and contact between a corrosion medium and metal is blocked through a physical shielding effect, so that an electrochemical corrosion reaction is inhibited; the growth of the zinc oxide nanoneedles can improve the specific surface area and the surface roughness of the modified mica, meanwhile, the zinc oxide nanoneedles are endowed with photocatalytic activity, active oxygen is generated under illumination, organic pollutants are decomposed, microorganism breeding is inhibited, and therefore biological corrosion is relieved; the aging of the anti-corrosion emulsion coating is reduced, and the adhesion of the coating to a photovoltaic cell can be increased through a mechanical interlocking effect by virtue of the nano needle-shaped structure.

The invention belongs to the technical field of biomedicine and nano material electronics, and particularly relates to a low-voltage efficient sterilization electrode device based on local enhanced electric field treatment. According to the electrode device, vertically-oriented nanoneedles serve as a core functional layer, a nanoneedle array is arranged on a conductive substrate, the intensity of an electric field in a pinpoint area is amplified by multiple times through the lightning rod effect induced by the tips of the nanoneedles so as to achieve irreversible electroporation of a low-potential induced pathogen membrane, the length of the nanoneedles is 5-100 micrometers, and the length of the nanoneedles is 5-100 micrometers. The curvature radius of the needle tip is lt; and the sterilization device can realize nearly complete sterilization on escherichia coli and methicillin-resistant staphylococcus aureus within 5 minutes. The invention further provides a nanometer microneedle sterilization patch based on the local enhanced electric field, a self-power-supply or external-source-power-supply energy supply mode is adopted, and rapid sterilization of a wound can be achieved without medicine adding.

The invention discloses an MXene quantum dot tip heterojunction material with high photothermal conversion efficiency. The MXene quantum dot tip heterojunction material comprises a substrate and a Co3O4 nanoneedle array structure grown on the substrate in situ, ti3C2MXene quantum dots are loaded on the surface of the Co3O4 nanoneedle, and the Ti3C2MXene quantum dots are fixed on the surface of the Co3O4 nanoneedle through the interaction force of heterogeneous charges. The invention also discloses a preparation method of the MXene quantum dot tip heterojunction material. The preparation method comprises the following steps: (1) preparing a Co3O4 nanoneedle structure arranged in an array on a substrate by using a hydrothermal method; and (2) under the irradiation of an ultraviolet lamp, putting the product in the step (1) into an MXene quantum dot solution, and soaking for 6-8 hours.

The invention discloses a Janus-MOF composite material as well as a preparation method and application thereof. The material is formed by heterogeneously integrating an adsorption module and a signal module through a lattice orientation growth method, wherein the adsorption module adopts a zirconium-oxygen cluster and a tetrafluoroterephthalic acid ligand to construct a molecular imprinting pore channel to specifically capture PFAS; the signal module comprises a spiropyrane modified ligand and an electrochemically deposited gold nano needle tip array, and the SERS detection limit reaches 0.05 ppt through photoresponse aperture regulation and three-mode (electromagnetic-chemical-mechanical) synergistic enhancement; the shell layer is doped with titanium dioxide quantum dots, PFAS can be degraded under ultraviolet irradiation, and the substrate can be recycled for more than or equal to 5 times. The invention further provides a surface enhanced Raman spectroscopy (SERS) and electrochemical impedance spectroscopy (EIS) dual-mode coupling technology, the cross validation detection error is less than or equal to 15%, the problems that the traditional method is poor in selectivity, low in sensitivity and incapable of in-situ regeneration are solved, and the method is suitable for rapid detection of trace PFAS in complex matrixes such as food, surface (undersurface) water and industrial wastewater.

The invention relates to the field of nano science and nano technology, in particular to a low-power particle capture and local thermal detection method and device based on tip-enhanced Raman optical tweezers, under laser irradiation, directional optical force is generated through an enhanced electric field between a nano tip and metal particles, and capture of the metal particles is achieved; raman scattering on the surface of the needle tip can be excited through focused laser, and the local temperature of the needle tip can be obtained by analyzing the change of a Raman characteristic peak. According to the method, directional optical force is generated through an enhanced electric field between the needle tip and the metal particles to capture the metal particles, the problem that the metal particles cannot be captured by single-beam 532 nm laser is solved, the power density of captured particles is reduced, and the adverse effect of the heat effect on capture is reduced. The method also can amplify the Raman signal of the needle tip to realize Raman detection of a local position, realizes temperature monitoring at the capture position, and lays a foundation for exploring the influence of the thermal effect on the capture process.

The invention discloses a multi-stage honeycomb and nano needle cone composite super-hydrophobic structure and a preparation method thereof.The composite super-hydrophobic structure comprises a honeycomb micron structure machined on the surface of a metal substrate, and the honeycomb micron structure comprises a plurality of structural units distributed in an array; and a plurality of nano cones which are vertical to the longitudinal growth of the metal base material and are tightly arranged are uniformly distributed in each structural unit, so that the surface hydrophobicity of the structure can be improved, and the strength, stability and durability of the super-hydrophobic structure can be improved. According to the method, laser ablation is conducted on the surface of a metal substrate from top to bottom through nanosecond laser, a honeycomb-shaped micron structure is machined, a plurality of nanometer needle cones are formed in a structural unit through the electrochemical deposition technology, and the composite super-hydrophobic structure is obtained. According to the method, expensive equipment is not needed, the machining efficiency is high, the cost is low, the controllability is good, and therefore the efficient and low-cost machining method is provided for firm preparation, durability and corrosion prevention of the high-durability super-hydrophobic surface.

The invention provides a chlorine corrosion resistant cathode for electrolyzing seawater as well as a preparation method and application of the chlorine corrosion resistant cathode. The preparation method comprises the following steps: S1, dissolving a cobalt salt, a nickel salt, a morphology regulating agent and a structure-directing agent in a solvent according to a molar ratio of (1-2.5): (1-2.5): (8-12): (6-10), and stirring to form a first solution; s2, a titanium mesh and the first solution are subjected to a hydrothermal reaction at the temperature of 100-150 DEG C, and CoNi layered double hydroxide with the shape of a nanoneedle array grows on the titanium mesh in situ; s3, selenium powder and a reducing agent are dissolved in a solvent according to the molar ratio of 1: (0.8-1.5) and stirred to form a second solution; and S4, carrying out hydrothermal reaction on the titanium mesh on which the CoNi layered double hydroxides grow in situ and a second solution at 150-190 DEG C so as to grow cobalt-nickel bimetallic selenide of which the morphology is a nanoneedle array in situ on the titanium mesh, thereby obtaining the chlorine corrosion resistant cathode.

The invention discloses a nitrogen-doped carbon-coated ternary nanoneedle array material, a preparation method thereof and application of the nitrogen-doped carbon-coated ternary nanoneedle array material in electrolysis of hydrazine hydrate, and belongs to the technical field of energy catalysis. The material comprises a substrate, a ternary nanoneedle array growing on the surface of the substrate and a nitrogen-doped carbon material loaded on the surfaces of the ternary nanoneedle array and the substrate, the ternary nanoneedle is composed of any three of iron, cobalt, copper, nickel and manganese. According to the NC-loaded ternary nanoneedle array provided by the invention, enrichment of active sites and enhancement of intrinsic activity are realized through cooperation of NC and the ternary nanoneedle array, and the conductivity of the ternary nanoneedle array can be effectively improved. For a hydrogen evolution reaction and an oxygen evolution reaction, electrons can be quickly transferred between the surface of the catalyst and a reaction intermediate, so that the reaction rate is accelerated. Meanwhile, the coating structure enables water molecules to be adsorbed and activated on the surface of the catalyst more easily by adjusting adsorption energy, so that the HzOR catalytic activity is promoted.

The invention discloses a preparation method of an alpha-Fe2O3 / SnO2 nanoneedle heterojunction gas sensitive material, and belongs to the technical field of preparation and application of inorganic composite materials. Adding a mixed solution of ferric chloride and sodium sulfate and the ceramic tube into a reaction kettle, carrying out hydrothermal reaction at 120-160 DEG C for 10-14 hours, taking out the ceramic tube after the reaction is finished, drying and annealing to obtain a ceramic tube loaded with alpha-Fe2O3 nanoneedles; dissolving tin chloride and urea in water to obtain a mixed solution, adding the mixed solution and the ceramic tube loaded with the alpha-Fe2O3 nanoneedle into a reaction kettle, carrying out hydrothermal reaction at 80-100 DEG C for 1-6 hours, taking out the ceramic tube after the reaction is finished, drying and annealing to obtain the alpha-Fe2O3 / SnO2 nanoneedle composite gas-sensitive material. The preparation method is simple, the product is high in crystallinity and good in stability and is suitable for preparing a high-economical gas sensitive sensor material, and a sensor prepared from the alpha-Fe2O3 / SnO2 nanoneedle heterojunction gas sensitive material can effectively improve the gas sensitive performance of alpha-Fe2O3 and shows an extremely high response value to NO2 while the working temperature is reduced.

The invention discloses an optical fiber micro-beam probe and system capable of achieving synchronous imaging of cell morphology and mechanical characteristics, the optical fiber micro-beam probe comprises a single-mode optical fiber, a Bragg grating, a supporting column, a micro-beam and a nanometer needle tip, the single-mode optical fiber comprises a fiber core and a wrapping layer outside the fiber core, and the Bragg grating is located in the fiber core of the single-mode optical fiber; the first end of the supporting column is fixed to the second end face of the single-mode optical fiber, one end of the micro-beam is fixed to the second end of the supporting column, and the nanometer needle tip is located on the surface of the other end of the micro-beam. The metal film is introduced to enhance the reflectivity of the micro-beam, and the nano needle tip is introduced to improve the cell morphology and mechanical imaging resolution. An optical fiber FPI sensitive external weak force is formed on the end face of an optical fiber by adopting a micro-beam probe, resonance of the micro-beam probe is excited by light driving, the resonance is influenced by the weak attractive force on the surface of a cell, the change of information such as resonant frequency and amplitude is monitored, and synchronous imaging of the morphology and the mechanical property of the living cell is realized. Miniaturization, integration and high efficiency of an imaging system are facilitated, and a new method is provided for cell imaging in the fields of biomedicine and the like.

The present invention is applicable to the field of electrochemical sensors and provides a method for preparing an enzyme-free electrochemical sensor with a modified electrode and its application, comprising the following steps: drawing a capillary quartz tube into a needle-shaped nanoquartz tube, uniformly distributing carbon nanoparticles on the tip of the nanoneedle tip to form a carbon nanotube (CNE); dissolving HAP, sodium hexametaphosphate, and potassium chloride in deionized water at a concentration ratio of 0.01 to 0.1:1:1, and ultrasonically forming a dispersion; placing the CNE as a working electrode, Ag / AgCl as a reference electrode, and a platinum wire as an auxiliary electrode in an electrolytic cell containing a HAP suspension solution, applying an external positive voltage to the working electrode CNE, and completing constant potential deposition to prepare an nHAP-CNE modified sensor. The sensor prepared based on the nHAP modified electrode has the advantages of high sensitivity, low sample requirement, high biological activity, and suitability for in vivo cell detection in detecting ascorbic acid.

The invention discloses a cobalt hydroxide electrode, the cobalt hydroxide electrode is cobalt hydroxide loaded by foamed nickel, the cobalt hydroxide is amorphous phase cobalt hydroxide, and the microstructure of the cobalt hydroxide is a nanoneedle. The electrode obtained by the invention has the characteristics of relatively high catalytic activity and relatively strong reaction kinetics. The invention further discloses a preparation method and application of the cobalt hydroxide electrode.

This invention provides a CNT / W 18 O 49 Cu nanofiber sea urchin material and its SERS-photocatalytic bifunctional application, wherein the material is internally embedded with carboxylated CNTs, and W 18 O 49 The nanostructures intertwine to form a three-dimensional network, and the surface of the nano-sea urchin material is composed of high-density radial nanoneedles with Cu at the tips. 2+ Anchored in an atomically dispersed form. This is achieved through carboxylation of CNTs with W... 18 O 49 Nanoneedles intertwine to form a three-dimensional network, creating a radial nanoneedle structure on the surface, with atomically dispersed Cu atoms anchored at the needle tips. 2+ It combines high-sensitivity SERS detection with efficient photocatalytic degradation, enabling integrated "detection-degradation" treatment of organic pollutants.

The invention belongs to the field of micro-nano structures, and relates to a double-layer gold nanopore structure supported by a nano needle tip as well as a preparation method and application of the double-layer gold nanopore structure. According to the preparation method, the double-layer gold nanopore structure supported by the nano needle tip is obtained through an electron beam thermal evaporation system, a polystyrene microsphere self-assembly technology and reactive ion etching (RIE), the preparation process is simple, the cost is low, the repeatability is good, the structural stability is good, and the tolerance is high. Compared with a single-layer gold nanopore structure, the single-layer gold nanopore structure not only has more modes, but also presents complex multi-mode response dependent on pumping wavelength.

This invention discloses a method for preparing a superhydrophobic flexible SERS substrate based on a glove template and Cu(OH)₂ nanoneedles, belonging to the field of Raman spectroscopy technology. It solves the technical problems of existing commercial templates being expensive, having limited area, and mostly being hydrophilic materials, thus failing to enrich target molecules and limiting substrate detection sensitivity. The method involves: pouring a PDMS mixture onto the surface of a KD-N-TPE glove template, allowing it to solidify, and then peeling it off to obtain a PDMS substrate with a micron-scale protrusion array structure; depositing Cu by vapor deposition; reacting a mixed solution of NaOH and K₂S₂O₈ with Cu to generate Cu(OH)₂ nanoneedle structures; and then depositing Ag by vapor deposition to obtain the superhydrophobic flexible SERS substrate. The advantages of this invention are: the prepared SERS substrate has high sensitivity and good uniformity, enabling low-concentration detection of target molecules, and is low-cost, low-consumption, and simple to operate.

The invention belongs to the field of membrane materials, and particularly relates to a hydrophobic breathable membrane and a preparation method thereof. The hydrophobic gas-permeable membrane provided by the invention is prepared by sequentially performing plasma bombardment activation, chemical vapor deposition of a SiO2 nano layer, hydrothermal synthesis of a CuSiO3 nano needle-shaped structure and modification of a hydrophobic silane coupling agent on the surface of a PTFE porous membrane. The method comprises the following steps: firstly, activating the surface of the PTFE membrane by utilizing a plasma bombardment technology to enable the PTFE membrane to have modifiability; then covering the surface of the activated film structure with a nano-scale SiO2 thin layer by means of a chemical vapor deposition (CVD) technology, so that the CuSiO3 nano needle-shaped structure can be constructed at one time through a hydrothermal synthesis method; finally, a hydrophobic silane coupling agent is modified, so that the membrane material has strong hydrophobicity. Experimental results show that the water contact angle of the hydrophobic breathable membrane is larger than 140 degrees, and the breathability is reduced by less than 5% compared with that of a PTFE porous membrane before treatment.

The invention belongs to the technical field of battery positive electrodes, and particularly relates to a solid solution positive electrode catalytic material for a lithium oxygen battery and a preparation method and application thereof. Comprising the following steps: firstly, growing a nickel-cobalt bimetallic precursor nanoneedle array on carbon paper by using a 1-octyl-3-methylimidazole chloride salt assisted hydrothermal method; then preparing a selenylation sample through a NaHSe solution; and step 3, cleaning the selenylation sample for multiple times, roasting in an argon atmosphere to remove excessive selenium, and synthesizing the Ni-doped CoSe2 solid solution nanoneedle array. The reaction conditions are mild and easy to control; the selenized material completely inherits the morphology of the precursor; and in the application of the lithium oxygen battery, the lithium oxygen battery still has excellent stability after multiple cycles, and enough discharge depth can be realized.

The invention discloses a corrosion-resistant polyion liquid coating and a preparation method thereof. According to the invention, ionic liquid monomer 3-ethyl-1-vinyl imidazole bromine salt is adopted to prepare polyionic liquid (PIL) through a free radical polymerization method, then the polyionic liquid is coated on a Cu (at) Cu (OH) 2 filter material with a super-hydrophilic Cu (OH) 2 nanoneedle coated copper mesh, the polyionic liquid is used as a protective coating of Cu (OH) 2, and the Cu (at) Cu (OH) 2 filter material can be used for filtering and purifying the Cu (OH) 2 nano-needle coated Cu (at) Cu (OH) 2 nano-needle coated Cu (at) Cu (OH) 2 nano-needle coated copper mesh. The prepared Cu-coated Cu (OH) 2-PIL filter material not only has an oil-water separation capacity in a wastewater environment, but also has a certain capacity of separating organic solvents with different polarities, Cu-coated Cu (OH) 2 and Cu-coated Cu (OH) 2-PIL as well as Cu-coated Cu (OH) 2 and Cu-coated Cu (OH) 2-PIL soaked in acid, alkali and salt solutions are analyzed by adopting methods such as XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), XPS (X-Ray Photoelectron Spectroscopy) and the like, and a result shows that a copper hydroxide layer structure on the surface of Cu-coated Cu (OH) 2 soaked in NaOH and NaCl severely collapses; after the PIL coated Cu coated Cu (OH) 2-PIL is soaked in NaOH and NaCl, Cu (OH) 2 on the surface of the PIL coated Cu coated Cu (OH) 2-PIL completely reacts with the HCl and loses separation capacity, however, the PIL coated Cu coated Cu (OH) 2-PIL still retains a complete nano copper hydroxide layer after being soaked in NaOH and NaCl, and part of Cu (OH) 2 is retained after being soaked in the HCl.

The embodiment of the invention discloses a visual nanoneedle transfection micro-fluidic chip, a preparation method and a cell transfection method.The micro-fluidic chip comprises a patterned glass nanoneedle substrate and a transparent PDMS micro-channel layer, the transparent PDMS micro-channel layer is bonded to the patterned glass nanoneedle substrate, and the transparent PDMS micro-channel layer is bonded to the patterned glass nanoneedle substrate. The patterned glass nanoneedle substrate and the transparent PDMS micro-channel layer jointly form a light-transmitting structure and are compatible with a fluorescent inverted microscope; wherein the surface of the patterned glass nanoneedle substrate is provided with a nanoneedle array of which the pinpoint height range is 700-1000nm and the pinpoint diameter range is 50-200nm; the transparent PDMS micro-channel is a micro-channel prepared from a high-transparency PDMS material, and the micro-channel comprises a channel main body, a channel inlet formed in one end of the channel main body and a channel outlet formed in the other end of the channel main body; wherein the height range of a flow channel in the flow channel main body is 10-25 microns, the width range of the flow channel is 10-100 microns, and a flow channel inlet is used for being connected with an external micro-flow pump.

This invention discloses a sea urchin-shaped oxygen-rich vacancy O vac This paper describes a CuO@ZIF-8 core-shell structured photothermal catalyst, its preparation method, and its application, belonging to the fields of photocatalytic materials and artificial nitrogen fixation technology. The technical solution is as follows: the catalyst has a core-shell structure, with the core being urchin-shaped copper oxide (CuO) microspheres. These microspheres are assembled from radially arranged one-dimensional nanoneedles or nanospikes, and the surface of the core contains oxygen vacancies (O). vac The shell is an in-situ grown ultrathin zeolite imidazole ester framework material, ZIF-8, which possesses hydrophobic and molecular diffusion channel properties. This invention also constructs a matching biomimetic three-phase interface photothermal reaction system. Through the synergy of a hydrophilic substrate supplying water and a hydrophobic, permeable shell, it achieves a balance between gas diffusion and proton supply, reducing the submersion of active sites by liquid water and the occurrence of side reactions. This invention has significant advantages such as high photothermal conversion efficiency, mild preparation conditions, and high gas-liquid interface mass transfer efficiency.

The invention discloses a method for detecting circRNA expression level in real time and application of the method. The method comprises the following steps: (1) modifying a specific probe based on circRNA post-splicing sites onto a nanoneedle to obtain a capture probe; (2) placing the capture probe above the cells, centrifuging and incubating; and (3) hybridizing the probe modified with the fluorescent molecules, and analyzing a fluorescent signal on the capture probe, so as to obtain a detection result. The method disclosed by the invention is simple and efficient, and the circRNA expression level in the living cells can be obtained at a single cell scale and high throughput.

The invention discloses a processing method of a nano microneedle, which relates to the technical field of nano microneedles and comprises the following steps: cleaning the surface of a monocrystalline silicon or gold wafer, coating photoresist on the surface of the monocrystalline silicon or gold wafer, drying, transferring a microneedle array pattern to a photoresist layer through a photoetching process, putting the wafer into a vacuum reaction cavity, introducing reaction gas, and carrying out vacuum reaction on the wafer and the photoresist layer to obtain the nano microneedle. The processing method comprises the following steps: applying radio frequency power to generate plasma, carrying out anisotropic etching on a wafer, forming a microneedle cylinder, removing residual photoresist and cleaning to obtain a microneedle array, applying UV glue to a preset position of a plastic part, mounting the microneedle array to the glue dispensing position of the plastic part, and then carrying out UV irradiation on a mounted product to cure the UV glue. The size, the shape and the position of the microneedle and the nanostructure can be controlled by accurately designing a mask and etching parameters, the size range is from dozens of micrometers to hundreds of micrometers, the shape is from a cylinder to a cone, and the design freedom degree is large.

The invention discloses a preparation method and application of a superfine hollow CoSenanoneedle material. The method comprises the following steps: (1) mixing and dissolving cobalt nitrate, urea and ammonium fluoride, adding foamed nickel, preserving heat at 110-130 DEG C for 7-9 hours, cooling to room temperature, taking out the reacted foamed nickel, cleaning and drying to obtain a precursor; (2) mixing and dissolving selenium powder and sodium hydroxide, preserving heat at 190-210 DEG C for 7-9 hours, and cooling to room temperature to obtain an intermediate solution; and (3) putting the precursor into the intermediate solution, preserving heat at 140-160 DEG C for 7-9 hours, cooling to room temperature, taking out the reacted foamed nickel, cleaning and drying to obtain the superfine hollow CoSenanoneedle material. The nanoneedles directionally grow from the foamed nickel substrate to form a flower-cluster-shaped multilevel structure, so that the conductivity and the structural stability of a foamed nickel three-dimensional porous framework are reserved, and more catalytic active sites are exposed through the high specific surface area of the hollow nanoneedles.

The invention relates to a high-thermal-conductivity colored polyimide composite film and a preparation method thereof. The composite film is obtained by casting a colored polyimide solution on a conductive substrate containing a nano needle-shaped ZnO crystal array and then performing high-temperature vacuum solvent removal. The composite film provided by the invention not only has wide-range color adjustability, ultraviolet resistance and color uniformity, but also has excellent heat-conducting property, and has application potential in the fields of flexible display, 5G antennas, color bearing films, high-heat-conductivity insulating films, microelectronics and the like.