122 results about "Electrochemical etching" patented technology

The invention discloses an SERS (Surface Enhanced Raman Scattering) substrate with a needle-like diagram nanostructure and a preparation method of the SERS substrate, and belongs to the field of nanotechnology and detection. The preparation method of the needle-like Turing nano-structure SERS substrate comprises the following steps: by taking a silver needle as a carrier, carrying out electrochemical etching on the surface of the silver needle to induce to form a Turing nano-structure with fractal topological characteristics, and then inducing to conformally grow a layer of zeolite imidazole framework-8 material as a shell layer by utilizing the nano curvature characteristics of the fractal structure, so as to prepare the needle-like Turing nano-structure SERS substrate. And a composite SERS enhanced platform with an electromagnetic field hot spot aggregation effect and a molecular screening and enriching capability is constructed. The platform has the advantages of high structural uniformity, expandability in manufacturing, synergy of signal enhancement and molecular recognition and the like, remarkably improves the detection sensitivity and the signal reproducibility, and is suitable for trace analysis in a complex sample system, such as related application in the fields of food safety, environmental pollution monitoring, biomedicine and the like.

The invention belongs to the technical field of preparation of high-quality metallic nickel connecting strips for new energy batteries, and provides a preparation process for optimizing residual stress of a metallic nickel stamping connecting sheet for a new energy battery, which specifically comprises the steps of material selection, striping, continuous die stamping, inert atmosphere protection annealing, and residual stress detection and control. The range of corners and chamfers of a stamping die adopted in the progressive die stamping is 0.2 mm-1 mm, and the fit dimensional tolerance of a female die and a male die of the stamping die is controlled to be + / -0.05 mm; and the stamping surface in contact with the metal nickel strip is processed by adopting an electrochemical corrosion milling method, the roughness Ra of the stamping surface is less than 0.4 mu m, and the hardness HRC is more than or equal to 55. The metal nickel connecting strip prepared through the method is low in residual stress and small in size deformation after being used, the service life of the metal nickel connecting strip is prolonged, safety and reliability of the metal nickel connecting strip are improved, and the application prospect is wide.

The invention provides an electrochemical etching preparation method of a perforated battery copper foil, which comprises the following steps: firstly, pretreating the copper foil, then performing asymmetric bidirectional pulse etching in a specific electrolyte system by taking the copper foil as an anode and a platinum sheet as a cathode, and gradually decreasing the pulse interval time in a gradient manner in the etching process; and after etching is completed, immediately transferring into an ammonia water solution containing a sulfonated modified calixarene supramolecular corrosion inhibitor to stop the reaction, and drying and annealing to obtain the sulfonated modified calixarene supramolecular corrosion inhibitor. By dynamically regulating and controlling the pulse interval time and cooperating with the electrolyte with specific components and the efficient supramolecular corrosion inhibitor, the uniformity and controllability of the etching process are remarkably improved, and the problems that in the prior art, hole distribution is not uniform, excessive etching is likely to happen, the hole shape is irregular, and efficiency is low are solved; the prepared copper foil has the characteristics of uniform and consistent pore structure, smooth pore wall and excellent mechanical property and conductivity, and the application performance and reliability of the copper foil in a high-end lithium ion battery current collector are greatly improved.

The invention provides an aluminum foil and a preparation method thereof, the preparation method comprises the following steps: the aluminum foil is subjected to electrochemical corrosion in a mixed acid solution, the half cycle of alternating current adopted by the electrochemical corrosion comprises a plurality of wave crests, and the mixed acid solution comprises at least one of nitric acid and phosphoric acid; passivating the aluminum foil; washing the aluminum foil with water; and the steps of electrochemical corrosion, passivation treatment and water washing are repeated until the aluminum foil reaches the preset corrosion amount. The nitric acid can improve the overall corrosion amount, reduce the surface corrosion of the aluminum foil and promote the longitudinal development of corrosion. Phosphate radicals and aluminum ions can form a complex, so that the concentration of free Al < 3 + > in a hole etching area is reduced, corrosion reaction balance is pushed to move rightwards, and further corrosion is promoted.

The invention relates to a controllable electrochemical etching strategy based on solubility product difference, in particular to a preparation method of a barium sulfate modified NiCo-LDH aqueous alkaline zinc battery positive electrode material, which comprises the following steps: firstly, dissolving 1, 4-phthalic acid and sodium hydroxide in a molar ratio of 1: 2 in water to obtain a solution A; dissolving barium nitrate pentahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and ammonium fluoride in water according to a molar ratio of (0-1.5): 1: 4: 10 to obtain a solution B; the preparation method comprises the following steps: fully mixing the solutions, transferring the mixed solution into an autoclave containing foamed nickel (NF), and carrying out solvothermal reaction to obtain a tri-metal Co / Ni / Ba-MOF precursor (CNBx-BDC); cNBx-BDC is used as a working electrode, a platinum wire is used as a counter electrode, Hg / HgO is used as a reference electrode, 5-6M potassium hydroxide and 0.05-0.06 M sodium sulfate are used as electrolyte, a three-electrode system and a cyclic voltammetry method are adopted, electrochemical etching is carried out at the scanning rate of 20-30mV s <-1 > under the voltage range of 0-0.5 V, and the barium sulfate nanodot functionalized Co / Ni / Ba-LDH electrode (BS (at) CN-LDH) is obtained after six times of circulation. The unique porous structure can provide more electrochemical active sites and enhance electrolyte infiltration capacity, and the constructed heterostructure forms a strong built-in electric field, accelerates charge transfer, reduces ion diffusion energy barriers and improves energy utilization efficiency.

The invention provides a preparation method of a nano-selenium fertilizer prepared by an electric etching method and agricultural application. The preparation method of the nano-selenium fertilizer prepared by the electric etching method comprises the following steps: S1, preparing a selenium-containing precursor solution; s2, connecting a graphite rod with a direct-current power supply anode and immersing into the solution, and connecting another conductive substance with a direct-current power supply cathode; s3, applying direct-current voltage for etching, and performing centrifugation and concentration treatment on the electrolyte to obtain the nano-selenium fertilizer; the nano-selenium fertilizer is added into a hydroponic nutrient solution, the problem of large-scale production of the nano-selenium fertilizer is solved with a low-cost and green process through an electrochemical etching in-situ synthesis path, the bottleneck of traditional selenium fertilizer absorption efficiency is broken through depending on a selenium-carbon quantum dot composite structure, and an efficient solution is provided for agricultural quality and yield improvement.

The invention provides an electrolyte composition, an electrochemical in-situ etching method of non-metallic inclusions for heavy rail steel and application of the electrochemical in-situ etching method. The electrolyte composition comprises the following components in parts by weight: 1.6 to 2.3 parts of lithium chloride, 10 to 13.5 parts of acetylacetone, 45 to 84 parts of methanol and 2 to 43 parts of a reagent A, the reagent A is a mixed aqueous solution of ethylenediamine tetraacetic acid and sodium citrate. The lithium chloride, the acetylacetone, the methanol and the reagent A in specific parts are matched for use, the obtained electrolyte composition is used for in-situ electrochemical etching of the heavy rail steel, and three-dimensional in-situ etching of the non-metallic inclusions in the heavy rail steel can be successfully achieved. The in-situ information of the non-metallic inclusions in the hypereutectoid heavy rail steel is reserved, and the three-dimensional morphology of the non-metallic inclusions can be presented more comprehensively.

The invention relates to the technical field of batteries, in particular to an ultra-thin copper foil, a preparation method thereof and a battery. The preparation method comprises the following steps: providing an initial copper foil, fixing the initial copper foil on an anode plate, placing the initial copper foil and a cathode plate in an electrolyte together, electrifying and carrying out electrochemical etching, so that the thickness of the initial copper foil fixed on the anode plate is reduced, and the ultra-thin copper foil is obtained. According to the method, the thick initial copper foil is used as the anode, the electrochemical etching method is used for preparing the ultra-thin copper foil, the problems that when the ultra-thin copper foil is produced in the prior art, the copper foil with the specific thickness is selected as a carrier, and stripping is needed again, so that the process is tedious, and the cost is high are solved, and a new thought is provided for development of the ultra-thin copper foil. Meanwhile, no specific requirement on the copper foil of the anode exists, that is, the copper foil at the anode is easy to obtain, and the preparation cost of the ultrathin copper foil is effectively reduced.

The invention discloses a preparation method of a metal surface micro-pattern texture, and belongs to the technical field of metal materials and machining thereof. The method comprises the following steps: S1, depositing a metal shading layer on a monocrystalline silicon wafer and patterning, spin-coating a polysiloxane precursor, curing and stripping to prepare a flexible transparent photoetching template; s2, conformally attaching a template to the cleaned bent metal surface, and performing ultraviolet exposure and development to form a cured photoresist mask; and S3, the metal workpiece with the mask serves as an anode, the metal workpiece with the mask is placed in HF-HCl mixed electrolyte for electrochemical etching, the voltage is controlled to be 2.0-5.0 V, the time is 2-8 min, and the micron-sized surface texture of 0.5-2.5 microns is obtained. And the thickness of the template is 0.3-3.0 mm, so that the template can adapt to metal surfaces with different curvature radiuses. According to the method, the photoetching-electrochemical etching process is successfully extended to the curved metal surface for the first time, the pattern fidelity is high, the texture depth is controllable, and the method can be widely applied to key parts, needing mechanical sealing and lubricating, of a carrier vehicle body.

The invention discloses a copper-diamond composite board with high heat conductivity and low expansion coefficient and a preparation method thereof, and belongs to the technical field of preparation of heat-conducting packaging materials for electronic equipment. The preparation method comprises the following steps: grinding and cleaning a base copper plate, milling a rectangular groove to obtain a pretreated base copper plate, and performing electrochemical etching on the pretreated base copper plate to obtain an etched base copper plate; filling a rectangular groove in the etched base copper plate with the carbon nano tube and modified diamond, and compacting for 1-2 minutes under 20-30 MPa to obtain a mixed base copper plate; and the copper covering plate covers one side of the mixed base copper plate filled with the carbon nano tube modified diamond, and then the mixed base copper plate is placed in a graphite mold to be subjected to direct current hot pressing sintering to obtain the copper-diamond composite plate. The prepared copper-diamond composite board has good heat conduction performance and low thermal expansion performance, the bending strength is high, and the problem that the brittleness of the material is too high is effectively solved.

The invention relates to a method for producing an electronic component. The method comprises: forming a first semiconductor layer of a first material on a substrate of a second material, wherein the first material differs from the second material; forming a dielectric structure on the first semiconductor layer, wherein the dielectric structure has a plurality of openings, and in the openings the first semiconductor layer is exposed; epitaxially forming a second semiconductor layer on the first semiconductor layer, which in the openings is exposed, and at least in a region above the dielectric structure, wherein the second semiconductor layer comprises or is formed from the first material; and forming a third semiconductor layer on or above the second semiconductor layer in a first region above the openings of the dielectric structure and in a second region above the dielectric structure. The method also comprises: forming a sacrificial structure on the second semiconductor layer; forming the third semiconductor layer on the sacrificial structure; and removing the sacrificial structure such that the third semiconductor layer is separated from the second semiconductor layer.

The invention relates to a preparation method of an epitaxial structure with micron holes and the epitaxial structure, and belongs to the technical field of epitaxial wafer manufacturing. Comprising the following steps: sequentially growing an AlN buffer layer, a Si-doped 3D AlN layer containing a nano-scale air gap, a high-temperature AlN layer, an n-type AlGaN layer, a multi-quantum well active layer, an electron barrier layer, a p-type AlGaN layer and a p-type GaN contact layer on the surface of a substrate; etching a region corresponding to the n electrode in the epitaxial structure until the air gap is exposed; growing a SiO2 protective layer; enlarging a nano-scale air gap to a micron-scale air gap through electrochemical etching; and preparing a p electrode metal layer on the p-type GaN contact layer, and preparing an n electrode metal layer on the micron-level air gap of the Si-doped 3D AlN layer to obtain an epitaxial structure with micron holes. According to the invention, the nanoscale fusiform air gap is expanded to the micron scale by using the dry etching process and the electrochemical etching process, so that the light extraction efficiency is improved.

The application provides a preparation method of an aluminum foil current collector, an aluminum foil current collector, a positive pole piece and a lithium ion battery, and relates to the technical field of new materials for energy storage devices. The preparation method of the aluminum foil current collector comprises the following steps: performing pretreatment on the surface of a base material aluminum foil with a purity of 99.7% or above, so that the surface reaches a du Nouy value of 64 dyne / cm or above, to obtain a pretreated base material aluminum foil; performing electrochemical etching treatment on the pretreated base material aluminum foil, to obtain an etched base material aluminum foil; performing cleaning on the etched base material aluminum foil, and then performing post-treatment, so that a phosphating film is formed on the surface, to obtain the aluminum foil current collector. The preparation method of the aluminum foil current collector is an etched aluminum foil current collector for high-safety lithium ion batteries and a preparation method, and can solve the problems that the safety is not good enough when a conventional current collector is used to prepare a lithium ion battery, and the mechanical property of a high-purity aluminum foil is poor after etching.

This invention discloses a peelable nitride structure, its preparation method, and its peeling method. The peelable nitride structure includes a substrate, a buffer layer, a sacrificial layer, an etching layer, and a target nitride structure arranged sequentially. The sacrificial layer has through-cracks. Because a sacrificial layer with through-cracks is introduced into the buffer layer and the target nitride structure, the through-cracks provide flow channels for the solution, allowing for rapid etching of the etching layer via electrochemical etching to achieve peeling of the target nitride structure from the substrate and the buffer layer.

The invention relates to the field of batteries, in particular to a low-internal-resistance vanadium redox flow battery electrode material and a preparation method and application thereof. The preparation method of the low-internal-resistance vanadium redox flow battery electrode material comprises the following steps: carrying out plasma activation treatment on an electrode base material to obtain an activated electrode material; the method comprises the following steps: mixing a bimetallic MAX phase compound with a fluorine-containing salt solution, and carrying out electrochemical etching to obtain an MXene material; the preparation method comprises the following steps: dispersing an MXene material in water, and adding carbon nanotubes and a surfactant to obtain a dispersion liquid; dipping the activated electrode material in the dispersion liquid, and carrying out hydrothermal reaction to obtain an intermediate product; dipping the intermediate product in a dopamine hydrochloride solution containing metal salt, adopting a pulse electrochemical deposition method layer, and then performing carbonization and activation treatment in sequence to obtain the low-internal-resistance vanadium redox flow battery electrode material. The low-internal-resistance vanadium redox flow battery electrode material provided by the invention can effectively reduce electrode polarization, improve the energy utilization rate and prolong the service life.

The invention relates to the technical field of semiconductor materials, in particular to a method for growing a high-quality GaN crystal through a porous GaN micron pyramid structure. The method comprises the following steps: providing a GaN substrate, and arranging a mask with regular periodic patterns on the surface of the GaN substrate to obtain a pattern substrate; wherein the regular periodic pattern is an array formed by a plurality of pores, and the pores can expose the GaN substrate; growing a GaN pyramid in the pores of the pattern substrate so as to construct a micron GaN pyramid array in the pattern area of the pattern substrate; etching a porous structure on the micron GaN pyramid array by using electrochemical etching to obtain a substrate with the porous micron GaN pyramid array; and taking the porous micron GaN pyramid array as a seed crystal, and carrying out epitaxial growth by using an HVPE method to obtain the target GaN crystal. According to the invention, the GaN crystal with large size, low defect density and high crystal quality can be prepared.

The invention relates to a conductive carrier load defect and rare earth co-regulated layered double hydroxide catalyst as well as a preparation method and application thereof, and belongs to the field of preparation of value-added products by oxidation of organic matters. The preparation method comprises the following steps: dissolving a transition metal source, a rare earth salt, an aluminum source, a precipitator and ammonium fluoride in a solvent, carrying out surface controllable growth with a conductive carrier in a hydrothermal kettle through a hydrothermal reaction, and drying to obtain the conductive carrier loaded rare earth regulated layered double metal hydroxide; and carrying out electrochemical etching on the conductive carrier loaded rare earth regulated layered double metal hydroxide in an alkali solution, washing and drying to obtain the conductive carrier loaded defect and rare earth co-regulated layered double metal hydroxide catalyst. According to the invention, defects and rare earth regulation are creatively combined, the method has the green synthesis characteristics of cheap raw materials, low energy consumption, no noble metal addition and the like, and a new normal form is provided for developing a low-cost and high-stability non-noble metal electrocatalyst.

The invention provides a microporous copper foil preparation method, which comprises: mixing an oxidizing agent, a corrosion inhibitor, a complexing agent, a surfactant and water, and adjusting the pH value to obtain a corrosive liquid; performing electrochemical etching in the corrosive liquid by taking the electrolytic copper foil as an anode and a cathode plate at a specific point location as a cathode to form a copper foil; and cleaning the etched copper foil, and passivating the cleaned copper foil in an anti-oxidation solution to obtain the microporous copper foil. The method provided by the invention comprises the following steps: taking a copper foil as a corrosive anode, forming an electrolytic tank with a cathode plate at a specific point location and a corrosive liquid, carrying out site oxidation on the surface of the copper foil through an oxidant, and carrying out acid corrosion on the site to form a blind hole; in order to ensure that the corrosion degree of the copper foil is consistent, blind holes are formed, a corrosion inhibitor, a surfactant and a complexing agent are combined, and the corrosion rate of the copper foil is reduced; the method can effectively control the formation of copper foil micropores and the size of the pore diameter.

According to the electrochemical etching preparation method of the porous battery aluminum foil, the porosity, uniformity and surface performance of the aluminum foil are remarkably improved through the steps of multi-stage gradient annealing treatment, pulse voltage electrochemical etching, segmented ultrasonic cleaning, surface modification treatment and the like; according to the method, a composite electrolyte system is adopted to collaboratively optimize the etching effect, and accurate regulation and control of the aluminum foil hole structure are achieved by controlling the waveform of pulse voltage, the ratio of forward voltage to reverse voltage and illumination auxiliary conditions; in addition, the cleanliness and the interface bonding force of the aluminum foil are further improved through segmented ultrasonic cleaning and silane coupling agent surface modification, the surface activity is enhanced through low-temperature plasma treatment, and compared with a traditional method, the aluminum foil prepared through the method has higher mechanical strength, more uniform pore distribution and more excellent electrochemical performance; the energy density and the cycle life of the battery can be remarkably improved, and the method is suitable for the fields of high-performance lithium ion batteries and the like.

The invention provides a method for applying a low-concentration mixed acid electrolyte to electrochemical etching of a commercial alloy electrode, and belongs to the technical field of electrochemistry. In-situ surface etching is carried out on commercial alloy through mixed acid electrolyte, a surface micro-nano structure is formed, the surface area and the electrochemical active area of the commercial alloy are remarkably increased, and the method comprises the following steps that firstly, phosphoric acid, hydrochloric acid, sulfuric acid or nitric acid are mixed according to a specific combination and proportion, and a low-concentration mixed acid solution is obtained; and 2, using a double-cathode strategy in an electrolytic bath, fixing the pretreated commercial alloy in the electrolytic bath as an anode and electrodes on two sides as cathodes, adding the mixed acid electrolyte in the step 1 for electrochemical etching, taking out after the reaction is completed, cleaning, and carrying out vacuum drying. According to the method, the surface area and the electrochemical active area of the commercial alloy can be remarkably increased, a specific surface micro-nano structure is formed according to different commercial alloy types and etching parameters, and the method is suitable for hydrogen production application of alkaline electrolyzed water and electrolyzed seawater.

The present disclosure provides a reaction chamber and a method for using the same, the reaction chamber including a mesh cathode, a first anode, a second anode, and a reaction chamber body, the reaction chamber body being hollow and having a first opening and a second opening, capable of sealing a semiconductor wafer to be electrochemically etched. One advantage of the reaction chamber and method disclosed herein may be that it allows multiple etching operations to be performed with minimal or no operator contact with an etching solution such as hydrofluoric acid.

The application discloses a foil type tantalum electrolytic capacitor anode with super high capacitance density and a preparation method thereof. The energy source is a pulse direct current power supply, the pre-processed tantalum foil is used as the anode, the graphite electrode or inert metal is used as the cathode, the anode and the cathode are connected with the pulse direct current power supply, and are placed in an etching solution to perform electrochemical etching. The etching foil is subjected to anodic oxidation in a phosphoric acid aqueous solution to obtain the etched tantalum foil. The electrochemical etching process truly realizes the preparation of the high specific capacity etched tantalum anode foil. For the anode foil with a voltage resistance of 8.3V, the specific capacity is up to 570nF / mm 2 , and the thickness is less than 30μm, which is only 1 / 10 of the traditional sintered tantalum capacitor. If the tantalum capacitor is packaged in a sheet type, the size can be even reduced to below 100μm, which can almost meet the requirements of the most stringent embedded capacitor in technology. If the tantalum capacitor is packaged in a winding type, the maximum capacity can fully meet the requirements of more than 90% of the power system.

The invention discloses a copper-zinc catalyst material for carbon dioxide reduction and a preparation method thereof. The method comprises the following steps: by taking a zinc acetate solution as an electrolyte, carrying out constant-potential electrochemical deposition on foamy copper to obtain a copper-zinc base mold; cO2 is introduced into a cathode chamber of an electrolytic tank with a KHCO3 solution as an electrolyte and a copper-zinc-based mold as a working electrode until the cathode chamber is in a saturated state, and the copper-zinc-based mold is subjected to electrochemical etching through linear voltammetry scanning to obtain the copper-zinc catalyst. The method is simple and controllable, and the obtained catalyst has high specific surface area and excellent carbon dioxide reduction catalytic activity.

The invention relates to the technical field of electrochemical machining equipment, and discloses a carbon fiber yarn surface special-shaped electrochemical etching device and method based on a rotating cathode, and the device comprises an electrolyte tank, a fiber feeding system, a rotating cathode electrode system, a power supply system and a control system; the electrolyte tank is filled with electrolyte; the fiber feeding system is mounted in the electrolyte tank and is used for feeding carbon fibers; the rotating cathode electrode system comprises a driving assembly and a plurality of rotating tip cathodes; the driving assembly is installed in the electrolyte tank, a connecting cylinder is installed at the output end of the driving assembly, the carbon fiber yarn penetrates through the connecting cylinder, and the rotating tip cathode is installed on the connecting cylinder; the anode of the power supply system is connected with the carbon fibers, and the cathode of the power supply system is connected with the rotating tip cathode. According to the method, the periodic special-shaped etching pattern can be accurately formed on the surface of the carbon fiber yarn, the surface structure is optimized, the bonding force of the carbon fiber yarn and the bonding material is remarkably improved, the production efficiency is improved, and the manufacturing cost is reduced.

The invention relates to a monomolecular in-situ recognition and detection method based on intermolecular hydrogen bonds, and belongs to the technical field of monomolecular detection.The method comprises the steps that a gold nanoelectrode is prepared through an electrochemical corrosion method, then a bridging molecule solution with sulfydryl is combined with the surface of the gold nanoelectrode, meanwhile, gold nanoparticles are mixed with the bridging molecule solution, and the gold nanoparticles are obtained; the method comprises the following steps: modifying a gold nano-electrode, placing the modified gold nano-electrode in a modified gold nano-particle solution, adding a target molecule solution into the gold nano-particle solution, forming molecular knots by virtue of an electrostatic adsorption effect between gold nano-particles and the gold nano-electrode, dynamically adjusting the molecular knots by virtue of electrochemical regulation, and finally monitoring in real time by virtue of an SERS (Surface Enhanced Raman Scattering) signal. And obtaining identification information of the target molecule. Therefore, the method has the advantages of high identification precision, high sensitivity and real-time dynamic monitoring.

The invention belongs to the technical field of environmental engineering, and provides preparation of a phosphorus-doped high-curvature regulated titanium black porous electrode and application of the phosphorus-doped high-curvature regulated titanium black porous electrode in deep reduction of an electrochemical enhanced pharmaceutical wastewater resistance gene. The high-curvature tip nanotube structure is prepared through NH4F electrochemical etching, the increased electrochemical active surface area and the tip enhanced electric field effect synergistically promote charge enrichment and electron accumulation, and the average current density of the system is remarkably improved. P doping further optimizes the surface curvature of titanium black, lattice expansion is induced by regulating lattice tensile strain, Ti track overlapping is reduced, a d band is narrowed, and the energy level of the d band is shifted upwards. The ratio of Ti < 3 + > and oxygen vacancies in the doped material are remarkably increased, the generation capacity of. OH is enhanced, the generation rate of < 1 > O2 is increased, and high-efficiency and low-power-consumption catalytic degradation of resistance genes and antibiotics in pharmaceutical wastewater is realized by combining the characteristics of two free radicals. The electrode is simple in preparation process, raw materials are cheap and easy to obtain, and the electrode has large-scale production potential.

The invention discloses a preparation method of hydroxyl-containing titanium carbide MXene, electrochemical etching and light induction are adopted in the preparation method, the preparation method is simple and environmentally friendly, and the hydroxyl-containing titanium carbide MXene prepared through the preparation method is good in dispersity in water and has good catalytic oxidation activity and excellent adsorption capacity. The hydroxyl-containing titanium carbide MXene provided by the invention can be used as a photocatalyst for removing arsenic pollutants in water.

A method for producing a planar semiconductor surface includes forming a workpiece that has a carrier substrate, one or more insulating layers, a semiconductor layer, a first etch stop layer, and a second etch stop layer; forming a contact on the workpiece; biasing the workpiece to a second voltage through the contact; etching the second etch stop layer and part of the first etch stop layer with a photo-electrochemical etching and the second voltage that selectively removes the second etch stop layer faster than the first etch stop layer; biasing the workpiece to a first voltage through the contact; and etching the first etch stop layer and part of the semiconductor layer with the photo-electrochemical etching and the first voltage that selectively removes the first etch stop layer faster than the semiconductor layer to produce a semiconductor device with a planar surface on the semiconductor layer.

The invention relates to the technical field of capacitors, and discloses an aluminum foil for an electrolytic capacitor and a production method thereof, and the production method comprises the steps: preparing a photochemical reaction main solution containing bis (2-ethylhexyl) phosphate, terephthalic acid, a photosensitive catalytic etching system and sulfolane; immersing a high-purity aluminum foil substrate into the reaction main liquid, performing patterning ultraviolet irradiation on the surface of the high-purity aluminum foil substrate, and generating an organic-inorganic hybrid dielectric layer in situ in an irradiated preset patterning area; and finally carrying out thermocuring treatment. The surface of the aluminum foil prepared by the invention comprises the patterned area formed by the dielectric layer and the non-patterned area for keeping the conductive characteristic of the metal. According to the method, a traditional electrochemical corrosion and formation two-step method is integrated into a one-step photochemical method, the technological process is remarkably simplified, and accurate construction of the functional area on the single aluminum foil is achieved. Meanwhile, the method is carried out in a non-water system, so that the generation of chlorine-containing wastewater is fundamentally avoided, and the environmental load is reduced.

This invention discloses a wettable hybrid surface directional transport fog collection device and method. The device includes: an aluminum alloy substrate and a honeycomb and cactus spine coupled biomimetic surface on the aluminum alloy substrate; the honeycomb and cactus spine coupled biomimetic surface is composed of superhydrophobic and superhydrophilic regions; the superhydrophobic region is the aluminum alloy substrate surface after electrochemical etching and fluorosilane modification treatment; the superhydrophilic region is a honeycomb and cactus spine coupled biomimetic pattern formed by laser precision etching on the superhydrophobic region, and the fluorosilane layer in this pattern region is removed and the surface microstructure is reconstructed. Specifically, the pattern consists of multiple wedge-shaped channels of the same size arranged periodically, in a regular arrangement simulating a honeycomb; the wedge-shaped channels have a width gradient from the narrow end to the wide end along the length direction. This invention can achieve full-process optimization from efficient fog droplet capture, rapid condensation, to directional transport and inertial desorption in a two-dimensional plane.