25 results about "Nanotube array" patented technology

This invention discloses a method for fabricating flexible radio frequency (RF) devices based on dry transfer of carbon nanotube arrays, specifically comprising: 1) fabrication of a rigid support layer; 2) fabrication of a carbon nanotube array protective layer; 3) fabrication of an auxiliary layer; 4) full peeling and unwrapping; 5) attachment to the target substrate; 6) thermal release transfer of the array film; 7) residual adhesive cleaning; 8) low-temperature annealing; 9) top-down patterning; 10) defining the gate region; and 11) gate fabrication. This invention utilizes a rigid material to mechanically support the thermal release adhesive peeling process, uses a metal protective layer to prevent organic adhesive from contaminating the carbon nanotube film material, and constructs an auxiliary layer to solve the stress matching problem between the two during the transfer process. This achieves complete peeling of the carbon nanotube array to the flexible substrate with high-quality, non-destructive transfer. The RF transistor device fabricated by this invention can meet the needs of future high-speed communications.

The application belongs to the technical field of proton exchange membrane fuel cell, and relates to a hydrophobicity-adjustable alloy nanotube array electrode for fuel cell and preparation and application thereof. Specifically, the application comprises preparation of metal nanotube array, alloying and hydrophobization of the metal nanotube array, and assembly of the membrane electrode. First, a metal nanotube array is constructed on a substrate surface through a two-step hydrothermal method; then, a hydrophobic substance is introduced into the metal nanotube array by means of immersion or ultrasonic spraying; then, pyrolysis is performed to realize alloying and hydrophobization of the nanotube array; finally, the nanotube array is transferred to a proton membrane, and the membrane electrode is cleaned. The membrane electrode can be applied to a proton exchange membrane fuel cell. The hydrophobicity-adjustable nanotube array electrode prepared by the application has the advantages of high catalyst activity and stability, low platinum loading, good water management, and easy scaling-up.

This invention discloses a method for preparing a polyaniline-titanium dioxide nanotube array composite electrode, comprising the following steps: (1) anodizing a titanium sheet to obtain a titanium dioxide nanotube array; (2) preparing a polyaniline solution through a polymerization reaction; (3) loading the polyaniline solution onto the surface of the titanium dioxide nanotube array through dip-coating, and drying to obtain the polyaniline-titanium dioxide nanotube array composite electrode. The preparation method of this invention can form nanotube clusters, strengthening the bonding force between the nanotubes and the substrate, and the formed nanotubes are more regular; moreover, the prepared nanotube array composite electrode can significantly improve the electrochemical and mechanical stability of polyaniline, thereby obtaining a larger capacitance and long-term charge-discharge cycle stability, and can also improve the conductivity of the TiO2 nanotube array.

This invention discloses a novel welding machine, comprising: a welding frame, the welding frame including a support frame, a sealed door on the front of the support frame, a welding chamber at the upper end of the inner cavity of the support frame, and a welding table at the bottom of the inner cavity of the welding chamber. This invention belongs to the field of welding machine technology. The purpose of this invention is to solve the problems of traditional hot cathode electron beam welding machines in the prior art, where the hot cathode requires continuous preheating, has a long start-up time, and still needs to maintain a high temperature in standby mode. The technical effect achieved is: using a directional carbon nanotube array microbeam emitter as a cold cathode, utilizing the field emission principle of carbon nanotubes, an electric field is applied between the grid and the cathode to allow electrons to escape from the tip of the carbon nanotube through quantum tunneling effect, without heating the cathode to a high temperature, achieving millisecond-level instantaneous start-up, solving the drawback of traditional welding machines requiring 5-10 minutes of preheating, and significantly improving work efficiency and equipment response speed.

The application relates to the technical field of textile dyeing and finishing, and particularly discloses a foam nickel loaded nitrogen-doped carbon nanotube / Mn-Zn-P alloy composite material, a preparation method and application thereof. The preparation method is as follows: a calcium carbonate / Ni-Fe alloy layer is prepared on the surface of foam nickel; then, an organic alcohol amine and an alkyne substance are used as a nitrogen source and a carbon source to pre-deposit a nitrogen-containing carbon layer, and subsequently, N2-NH3 and N2-ethylene mixed gas is sequentially introduced to carry out stage-by-stage chemical vapor deposition, so that a Ni / nitrogen-doped carbon nanotube array is obtained; finally, Mn-Zn-P alloy particles are loaded through constant-current electrodeposition. The composite material prepared by the application has high conductivity, excellent corrosion resistance and cycle stability, and provides an ideal electrode material for electrocatalytic hydrogenation reduction, and can be directly used as an indigo reduction electrocatalytic electrode, so that the application has wide industrial application prospects in the field of blue jean dyeing.

The present application relates to a kind of metal oxide hollow nanotube array material and its preparation method and application, belong to nanometer material technical field.The preparation method of the present application includes the following steps: S1, the substrate loaded with columnar micellar seed is soaked in solvent A, under oscillation condition, drop the solution of block copolymer, through stationary aging, elution and drying, obtain block copolymer nanobrush;S2, the block copolymer nanobrush of S1 is soaked in metal salt solution, after washing, again be soaked in solvent B by supercritical drying, obtain metal salt nanotube array material;S3, the metal salt nanotube array material of S2 is calcined, obtain the metal oxide hollow nanotube array material.The preparation method of the present application proposes the template guiding effect of block copolymer nanobrush, so that it can guide multifunctional metal oxide nanotube array, and on this basis, the adjustment of nanotube of different height is realized.

This invention relates to a peak-valley confined catalyst structure and a method for preparing a highly oriented spinnable carbon nanotube array. The peak-valley confined catalyst structure comprises a silicon substrate covered with a silica layer, a lower alumina layer, a metal catalyst layer, and an upper alumina layer, stacked sequentially. The contact surface between the lower alumina layer and the metal catalyst layer has a continuous peak-valley structure. The upper alumina layer and the peak-valley morphology work together to restrict the movement and aggregation of the catalyst at high temperatures. Subsequently, carbon nanotube arrays are grown based on the peak-valley confined catalyst structure using a water-assisted chemical vapor deposition method. During this process, the introduction of water vapor effectively removes amorphous carbon from the substrate and the surface of the carbon nanotubes, ensuring high cleanliness of the catalyst and the carbon nanotube array. The high-temperature hydrogen annealing, combined with the peak-valley confined catalyst structure, ensures uniform catalyst particle size and distribution, resulting in a highly oriented spinnable carbon nanotube array.

The application discloses a method for preparing carbon nanotube loaded metal single atoms by using flame reduction. The method comprises the following steps: firstly, pretreating a carrier; after air-drying, placing the carrier on a flame for fire reduction to prepare a carbon nanotube array; then, soaking the carrier in a metal precursor solution, taking out, air-drying and placing on the flame for fire reduction to prepare carbon nanotube loaded metal single atoms. The application provides a simple method for preparing carbon nanotube loaded metal single atoms in view of the problems of complicated preparation process and poor stability of current single atom catalysts. The preparation process avoids high temperature, high pressure, long time, high cost and other factors involved in the traditional single atom preparation. The whole preparation process is carried out at room temperature and normal pressure, the preparation period can be controlled within 1 hour, and the preparation method is universal, rapid and simple.

This invention relates to a rapid screening method for bone-repairing surface structures, belonging to the field of bone repair materials technology. It aims to solve the technical problems of low efficiency and low individual / group adaptability of traditional screening methods. This invention constructs a titanium dioxide nanotube array with a continuous gradient diameter of 0-200 nm using a four-electrode bipolar electrochemical method. Immunofluorescence staining of key bone repair factors BMP-2, RUNX2, OPN, and OCN, combined with panoramic scanning analysis, is used to normalize the average fluorescence intensity of each of the four factors and then sum them to obtain a comprehensive osteogenic coefficient. Based on this coefficient, the optimal bone-repairing surface structure corresponding to bone marrow mesenchymal stem cells (BMSCs) from different age groups or different pathological conditions (such as osteoporosis, osteoarthritis, etc.) can be precisely located. This invention achieves high-throughput screening covering multiple surface structures in a single experiment, providing an efficient technical path for the precise and personalized design of bone repair materials, and has significant clinical translational value.

The embodiment of the application provides a titanium dioxide nanotube intermediate layer cooperated with neodymium modified titanium-based lead dioxide hydrophobic electrode and a preparation method and application thereof, and belongs to the technical field of electrocatalytic oxidation anode materials. The titanium-based lead dioxide hydrophobic electrode comprises a titanium base plate, a titanium dioxide nanotube intermediate layer formed on the surface of the titanium base plate, which is a vertically oriented nanotube array structure, and a neodymium modified lead dioxide surface active layer deposited on the surface of the titanium dioxide nanotube intermediate layer; wherein the neodymium modified lead dioxide surface active layer is a super-hydrophobic surface formed by regulating a hydrophobic agent, and the contact angle with water is greater than or equal to 140 degrees. The electrode prepared by the application solves the problems of easy falling off of the active layer and passivation of the titanium base, greatly prolongs the service life of the electrode, and enhances the catalytic activity and corrosion resistance, thereby improving the efficiency of wastewater advanced treatment and salt resource utilization.

This invention relates to the field of micro / nanomaterial fabrication and micro energy storage device technology. The invention discloses an in-situ fabrication method for on-chip integrated nanotube array supercapacitor electrodes, comprising the following steps: in-situ construction of an on-chip patterned template; in-situ electrochemical growth of a metal nanotube array; in-situ conversion of a metal / metal oxide composite structure; and the forming of an integrated electrode. This invention directly constructs a patterned anodic aluminum oxide template on a chip substrate with a pre-prepared patterned conductive layer (non-aluminum material) and completes material growth. The resulting nanotube array electrode and the current collector on the chip are grown in situ and integrally formed, avoiding complex material transfer and secondary bonding steps. This achieves perfect compatibility with planar microelectronic processes and can be mass-produced on 4-inch and larger wafers.

This invention discloses a near-infrared light-responsive thermoelectrically coupled titanium-based implant, its preparation method, and its applications, belonging to the field of biomedical materials technology. The near-infrared light-responsive thermoelectrically coupled titanium-based implant provided by this invention includes a porous titanium substrate and a functional composite coating loaded on its surface; the surface of the porous titanium substrate has a titanium dioxide nanotube array; the functional composite coating includes carbon nanotubes, barium titanate, and pharmaceutically active ingredients loaded in the TiO2 nanotube array; the carbon nanotubes and the barium titanate are covalently linked and jointly grafted onto the surface of the TiO2 nanotube array. This invention achieves a synergistic effect of near-infrared light-triggered photo-thermal-electric conversion and controlled drug release by constructing a TiO2 nanotube composite coating covalently grafted with BaTiO3 on the surface of a porous titanium substrate and loading pharmaceutically active ingredients, thereby endowing the implant with active antibacterial and bone-promoting functions.

The present application relates to the field of diamond heat sink sheet, in particular to a preparation method of diamond heat sink sheet, carbon nanotube arrays are grown in situ on the surface of diamond; a titanium layer is sputtered on the surface of diamond by using a magnetron sputtering method, and a titanium carbide / carbon nanotube array composite structure is obtained by heat treatment at 500-600 DEG C under the protection of mixed gas composed of inert gas and hydrogen; the solder paste is placed between the diamond and the metal sheet to form a brazing piece, and finally vacuum brazing is carried out, the present application effectively solves the technical problems of weak interface bonding, large thermal stress and high interface thermal resistance when the diamond is connected with the metal, and a diamond heat sink sheet with high shear strength and high thermal conductivity is obtained, which has important application value for heat dissipation of high-power electronic devices.

The application belongs to the technical field of photoelectrocatalytic materials, and particularly relates to a three-dimensional p-n heterojunction photoelectrocatalytic material and a preparation method and application thereof. The preparation method is as follows: a titanium mesh is used as a substrate, an ordered three-dimensional TiO2 nanotube array is prepared by an anodic oxidation method, and a narrow-band-gap p-type semiconductor FeS2 is loaded into and on the surface of a wide-band-gap n-type semiconductor TiO2 nanotube by an electrochemical deposition method, so as to prepare a composite double-layer three-dimensional p-n heterojunction FeS2 / TiO2 photoelectrocatalytic material. Compared with the TiO2 material, when the material is used as a photoelectrocatalytic material to reduce CO2 to generate ethanol, the absorption of TiO2 in the visible light range is increased, the utilization rate of visible light by TiO2 is promoted, the separation of photo-generated electron-hole pairs is more favorable, and the performance of TiO2 in photoelectrocatalytic reduction of CO2 to generate ethanol is greatly improved. The problem that the conversion efficiency and product selectivity of pure TiO2 in photoelectric conversion of CO2 to generate ethanol are difficult to control is solved.

An implantable medical device includes a biocompatible flexible substrate and a bioactive agent release coating on at least a portion of a surface of the substrate. The bioactive agent release coating includes an oriented nanotube array of an inorganic material and at least one bioactive agent disposed on and / or in the nanotube array. The nanotube array provides delayed or extended release of a bioactive agent from the coating.

This invention discloses a method for preparing an iron-cobalt co-doped lead dioxide electrode and its application in the synergistic degradation of antibiotic-containing wastewater. Using titanium as a substrate and in-situ self-grown titanium dioxide nanotubes as a transition layer, the iron-cobalt co-doped lead dioxide electrocatalytic anode (Fe-Co-PbO2-TNAs / Ti) is prepared. This invention combines anodic oxidation with cathodic reduction, along with high-temperature calcination in a tube furnace. First, a TiO2 nanotube array (TNAs / Ti) is constructed on the surface of the titanium substrate. Then, the Fe-Co-PbO2-TNAs / Ti anode is prepared using a water bath-electrodeposition method, while simultaneously preparing an S-doped Co3O4 cathode. The constructed anode-cathode coupling system achieves the synergistic effect of anodic oxidation and cathodic reduction, effectively improving the removal capacity of typical recalcitrant organic pollutants in pharmaceutical and chemical wastewater by regulating the generation of active species and the interfacial electron transfer process.

This invention discloses an Au / N-TiO2 composite material, a photoelectrochemical sensor, its preparation method, and its applications. The Au / N-TiO2 composite material comprises an N-doped TiO2 nanotube array and Au nanoparticles loaded in the N-doped TiO2 nanotube array. Through the synergistic modification of TiO2 by N doping and the loaded Au nanoparticles, the problems of narrow photoresponse range, high carrier recombination rate, and insufficient active sites of TiO2 are solved simultaneously. Furthermore, the composite material of this invention can be used to prepare a photoelectrochemical sensor, which comprises the Au / N-TiO2 composite material and an aptamer composited on the Au / N-TiO2 composite material. The photoelectrochemical sensor of this invention can be used for biomolecule detection and has excellent stability and anti-interference ability.

This invention discloses a radio frequency (RF) transistor based on a carbon nanotube array and its fabrication method. The RF transistor includes a substrate with an insulating surface, an active region formed by an oriented array of semiconductor-type carbon nanotubes, a gate dielectric layer, a gate metal layer, and source and drain electrodes. The active region is a channel functional region surrounded by a continuous carbon nanotube-free region, retaining only the carbon nanotube strips required for channel conductivity and the necessary source-drain contact overlap region; the carbon nanotube-free region has a clearance margin δ around the perimeter of the channel functional region. This method thoroughly removes all carbon nanotubes outside the active region through plasma etching, physically cutting off parasitic conduction paths and eliminating capacitive coupling effects. Compared to traditional local line isolation methods, this invention can improve transconductance by ≥35%, cutoff frequency by ≥20%, maximum oscillation frequency by ≥15%, and reduce gate-source parasitic capacitance by ≥25%, while significantly improving device consistency, making it suitable for large-scale RF array integration.

The application relates to an anti-passivation titanium mesh anode and a preparation method thereof, and belongs to the technical field of anodes. The titanium mesh anode comprises a titanium base body, a TiO2 nanotube array interface layer formed by anodic oxidation on the surface of the titanium base body, a SnO2-Sb2O4-based solid solution intermediate layer compounded on the surface of the titanium base body, a nitrogen-doped carbon network derived from chitosan pyrolysis coated on the surface of the solid solution, and a Pr-doped IrO2-Ta2O5-based catalytically active layer compounded on the intermediate layer. In the preparation, the TiO2 nanotube array is first constructed on the titanium base body through anodic oxidation, then the intermediate layer precursor coating solution containing chitosan is coated and is subjected to thermal decomposition to form the SnO2-Sb2O4 solid solution wrapped by the nitrogen-doped carbon network, the Pr-doped IrO2-Ta2O5 active layer is coated, and finally, low-temperature plasma treatment is performed. The application provides high-bonding-force anchor points through the nanotube array, chemically captures active oxygen through the nitrogen-doped carbon network, and realizes oxygen storage self-repairing through the Pr-doped active layer. The three layers are synergistically combined, so that the anti-passivation capability and the catalytic stability of the anode are significantly improved.

This invention proposes a method for preparing a carbon nanotube array, characterized by the following steps: 1) providing two substrates; 2) etching and annealing a metal substrate, labeled as intermediate 1; 3) depositing carbon nanotubes (CNTs) on the surface of intermediate 1, gradually heating to cause intermediate 1 to undergo a second reconstruction, labeled as intermediate 2; 4) spin-coating a polymer solution onto the surface of intermediate 2 to form a polymer film, labeled as intermediate 3; 5) etching intermediate 3 to separate the polymer and carbon nanotubes from the metal substrate; 6) transferring the separated polymer and carbon nanotubes to a surface-insulating substrate to obtain a pre-prepared sample; 7) cleaning the pre-prepared sample to obtain the finished product. This invention prepares a horizontal carbon nanotube array with high density, high orientation, and high uniformity.

本发明涉及光生阴极保护领域，具体来说，涉及一种CoIn2S4 / TiO2纳米管束丛复合光阳极材料及其制备方法和应用。复合光阳极材料为TiO2纳米管上沉积CoIn2S4纳米颗粒。本发明的复合膜结构为CoIn2S4纳米颗粒沉积于TiO2纳米管上。CoIn2S4纳米颗粒复合后，TiO2在可见光区吸收显著提升，且半导体复合后匹配的能带位置能够驱动光生载流子快速分离，减少二次复合。本发明的CoIn2S4敏化TiO2纳米管阵列复合薄膜，作为光阳极材料进行阴极保护时，相对于TiO2材料，可以提高可见光的利用率和光生载流子的分离率，显著降低304不锈钢的电极电位，降低腐蚀速率。

The application discloses a kind of double-layer nano array materials and preparation method thereof, it is related to nanometer material technical field, the double-layer nano array material includes conductive glass, and nano rod array material and nanotube array material are sequentially arranged on the conductive glass.Nano rod array material and nanotube array material sequentially arranged on the conductive glass can be double-layer array homojunction material or double-layer array heterojunction material, this design can utilize one-dimensional nano array structure to provide high-speed channel for the transmission of photo-generated carriers on the one hand, on the other hand, compared with single-layer nano rod array, the double-layer array homojunction material also has the advantages of large specific surface area, high light absorption efficiency, etc., can greatly change and enhance the inherent photoelectrochemical activity and performance of material itself.