83 results about "MXenes" patented technology

The invention belongs to the technical field of material performance prediction, and discloses an MXenes material performance prediction method based on a graph neural network, and the method comprises the steps: obtaining the structural feature parameters of a to-be-predicted MXenes material; respectively matching node derivative information, edge derivative information and global derivative information based on the structural feature parameters; based on the node derivative information, the edge derivative information and the global derivative information, constructing an initial feature vector set, based on edge feature vectors and based on global feature vectors; and performing hierarchical processing on each feature vector in the initial feature vector set through each layer of the graph neural network to obtain the performance index of the to-be-predicted MXenes material target. According to the scheme, the key technical problems that in the prior art, geometric information coding is insufficient, and intra-layer and inter-layer interaction cannot be effectively distinguished are effectively solved.

Hybrid organic-inorganic MXenes (h-MXenes) having amido, imido, alkoxy, or aryloxy surface terminating groups and methods for synthesizing the hybrid organic-inorganic MXenes are provided. The synthesis of h-MXenes having a broad scope of erminal organic functional groups is carried out via the displacement of halide atoms from halide-terminated MXenes by deprotonated primary organic amines or deprotonated alcohols.

The invention belongs to the field of medicines, and particularly relates to a nanosheet capable of activating an STING pathway and improving microwave ablation as well as a preparation method and application of the nanosheet. The nanosheet is prepared from MXenes through organic acid treatment, organic alkali dispersion, STING agonist compounding and phospholipid modification, and has good microwave thermal conversion efficiency and an STING pathway activation function. The combined microwave ablation can enhance the immunogenic death of tumor cells, promote the maturation of dendritic cells, doubly activate immune response and effectively inhibit the growth and metastasis of prostatic cancer, provides a new strategy for the treatment of prostatic cancer, and can be used for preparing drugs for treating prostatic cancer.

This disclosure provides an optically active nanocomposite material having a textured substrate and a multilayer optical stack comprising multiple nanosheets. The nanosheets may be chiral and composed of materials such as transition metal chalcogenides, MXenes, or nanocarbon. The optically active nanocomposite material exhibits linear birefringence (LB) and linear dichroism (LD), and optionally circular dichroism (CD). The nanocomposite material also exhibits optical asymmetry. g The factor may be greater than or equal to 1. Furthermore, the nanocomposite material exhibits thermal stability, for example, remaining stable at temperatures above or equal to about 250 °C. This disclosure also provides different methods for preparing such nanocomposite materials using a layer-by-layer self-assembly (LBL) process.

The application discloses an anti-oxidation method based on pH response type MXenes and application thereof, and belongs to the technical field of two-dimensional nanomaterials, and specifically comprises the following steps: in a MXenes suspension, only by adding a metal ion-polyphenol organic compound complex and controlling the pH value to be 3-6, the anti-oxidation capping of MXenes is realized. On this basis, when application is needed, the MXenes maintaining the intrinsic characteristics can be separated out by adding an alkaline solution to adjust the pH value to be not less than 7. The whole process has low cost, avoids the problem that a reducing agent is difficult to remove, has strong universality, and enables the intrinsic characteristics of MXenes to be maintained for more than 3 years.

The invention relates to the technical field of energy storage materials, and discloses a supercapacitor and a preparation method and application thereof. The supercapacitor comprises a first electrode, a second electrode, a current collector and an electrolyte, the first electrode comprises a TiVC MXene film, and the electrolyte is an acidic electrolyte. In the prior art, research on MXenes for a supercapacitor is highly focused on Ti3C2, and exploration on other types of MXenes, especially key performance indexes (such as rate capability) of the MXenes is seriously insufficient. According to the invention, the huge potential of the double transition metal TiVC MXene as a high-performance supercapacitor electrode material is systematically proposed and verified for the first time, and the research system and the application range of the MXene material in the field of electrochemical energy storage are greatly enriched and expanded.

In one general approach, a method for fabricating a MXene includes etching a MAX phase for selectively removing an A group element from the MAX phase, thereby forming a multilayer MXene. The multilayer MXene is then intercalated and exfoliated. In another general approach, a method for fabricating a MXene includes contacting a MAX phase with an acid and a fluorophosphate salt in a nonaqueous solvent for selectively removing an A group element from the MAX phase, thereby forming a multilayer MXene. The multilayer MXene is then intercalated and exfoliated.

The present disclosure describes electrochromic devices comprising transparent conductive layer acting as an electrode, an active electrochromic film, an ion conductor, and an ion storage film at least one of which comprises at least one MXene material.

The application belongs to the technical field of nanometer layered materials, and particularly relates to a method for preparing MXenes material through electron beam irradiation; acid etching and electron beam irradiation are combined, MAX phase is etched at the same time, and the original closely stacked structure is modified into a sheet layer structure through electron beam irradiation. The MXenes material prepared through the method has high etching efficiency and controllability, the introduction of toxic F ion acid is avoided, the method is environment-friendly and simple to operate, and the obtained MXenes material has a dendritic layered structure.

The present application relates to the field of catalysts, more particularly, it relates to a kind of single-atom site catalyst and its preparation method.The preparation method of a kind of single-atom site catalyst includes: S1, preparation precursor;S2, preparation intermediate;S3, preparation single-atom site catalyst.The present application generates cation vacancy by doping heteroatom into transition metal compound loaded on MXenes using ionic liquid, so that the single-atom site catalyst prepared not only has more active sites, but also can effectively stabilize dense single atom, thereby improving catalytic performance.

This invention relates to a method for preparing an independently supported MXenes hydrogel film, comprising the following steps: forming a wet film by vacuum filtration of an MXenes suspension; immersing a filter paper containing the wet film entirely in an acid solution, utilizing hydrated hydrogen ions to induce interlayer confined crosslinking to form a gel structure, and then separating it from the filter paper; and washing the resulting gel film with deionized water until the pH value is close to neutral to obtain an independently supported MXenes hydrogel film. This method does not require the introduction of polymers or second-phase materials, retains the intrinsic conductive network of MXenes, and the resulting gel film possesses a three-dimensional porous structure, excellent mechanical stability and conductivity, making it suitable for applications such as aqueous energy storage, electromagnetic shielding, and flexible electronic devices. It has the advantages of a green process, controllable structure, and suitability for large-scale preparation.

Methods for synthesizing tungsten-based MXenes without using a MAX phase precursor.

The application discloses a titanium-based MXenes recycling and regenerating method, and the method comprises the following steps: (1) adding failed MXenes into an alkali solution to form an A solution; (2) hydrothermally treating the A solution at a specific temperature for a certain time; (3) centrifuging the solution after reaction to collect, and adding an acid solution into the collected sludge to form a B solution; and (4) stirring the B solution under ambient conditions for a certain time, and then centrifugally washing and collecting the solution by using deionized water to obtain regenerated MXenes. The application removes failed titanium-based MXenes derived oxide nanoparticles through alkali hydrothermal treatment and subsequent acid etching, and realizes MXenes recycling and regeneration. The strategy utilizes cheap and environment-friendly alkali and acid for step-by-step etching, and has the advantages of simple operation, environmental friendliness, low cost and easy industrialization scale application.

The application discloses a kind of high stability two-dimensional nanometer material aerogel and preparation method thereof, it is related to material science and nanotechnology field.The water solution of two-dimensional nanometer material is frozen and handled to obtain frozen tissue, then foam structure is obtained by freeze drying, after which foam structure is soaked in ionic solution, freeze-dried, to obtain two-dimensional nanometer material aerogel.The application constructs two-dimensional nanometer material foam structure and introduces ionic bond crosslinking mechanism, so that two-dimensional nanometer material is combined by ionic bond to form high stability aerogel, so that aerogel has excellent performance.The application breaks through the selection limit of traditional aerogel material, and is suitable for ceramic two-dimensional material and MXenes with insufficient surface functional groups, lays a foundation for two-dimensional material aerogel large-scale production and application in the field of energy, aerospace and the like.

The invention belongs to the technical field of photothermal-photocatalytic synergistic materials, and particularly relates to a reduced graphene oxide-based nanocomposite as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, uniformly dispersing a graphene oxide dispersion liquid; s2, adding Ti < 3 > C < 2 > TX MXene, cobalt chloride hexahydrate and thioacetamide into the graphene oxide dispersion liquid to form a uniform reaction system; s3, carrying out hydrothermal reaction on the reaction system obtained in the step S2; s4, soaking and washing a product obtained after the hydrothermal reaction in the step S3; and S5, carrying out freeze drying on a product obtained after washing to obtain the reduced graphene oxide-based nano composite material. According to the preparation method disclosed by the invention, the reduced graphene oxide with more oxygen-containing functional groups reserved on the surface is obtained by utilizing the in-situ auto-oxidation reduction reaction between the graphene oxide and the Ti3C2TX MXene under the condition of not needing additional oxidizing agents and reducing agents, so that the composite material is endowed with good water transmission performance, and the high water evaporation rate is realized.

This invention discloses a two-dimensional layered ammonia oxidation catalyst based on MXene, its preparation method, and its application in low-temperature ammonia fuel cells. The catalyst comprises an active component and a support. The active component is one or two of the transition metals Pt, Ir, and Pd, and the support is accordion-shaped MXenes. The catalyst support prepared by this invention has a large specific surface area, in which the transition metal nanoparticles are uniformly dispersed and have strong interactions with the MXenes, which can significantly improve its ammonia electrocatalytic oxidation activity, showing good application prospects in ammonia fuel cells.

The invention relates to a method for preparing MXenes porous powder based on covalent bond crosslinking. The method comprises the following steps: mixing graphene oxide (GO) dispersion liquid and MXenes dispersion liquid to form mixed dispersion liquid; adding sodium chloride to form a mixed system; the mixed system is dried, sodium chloride is crystallized and separated out, and an M-O-C covalent bond cross-linked structure is formed through a condensation reaction between hydroxyl on the surface of MXenes and hydroxyl on the surface of graphene oxide in the drying process; and crushing the obtained composite block, washing with water to remove the sodium chloride template, and drying to obtain the MXenes porous powder. According to the method, a stable three-dimensional porous structure is constructed under the water system condition by utilizing the synergistic effect of salt template space separation and in-situ covalent cross-linking, and the method is simple in process and suitable for large-scale preparation.

This invention discloses a highly efficient method for activating peroxymonosulfate (PMS) to degrade ofloxacin. The method is characterized by employing a degradation catalytic material based on an Mxenes support, containing both Mn and N active sites, to activate PMS. The synergistic effect of the combined catalytic action of the Mn and N active sites enhances the activation efficiency of PMS, thereby achieving the degradation of ofloxacin in water. This invention reduces metal leaching, improves degradation stability, and increases the efficiency of PMS-activated ofloxacin degradation during the ofloxacin degradation process. It also boasts advantages such as simple material preparation, low cost, convenient implementation, good catalytic degradation effect on pollutants, convenient recovery, and no secondary pollution.

This invention discloses a method for preparing bimetallic MXene modified by transition metal ions, which prepares different metal ions (Co) through electrostatic interactions. 2+ Ni 2+ and Mn 2+ ) and Mo2TiC2T intercalated with different concentrations x Material (labeled as Mo2TiC2T) x The study investigated the feasibility of modifying MXene materials by performing detailed characterization and analysis on the prepared samples. Analysis of the phase and morphology of the prepared samples revealed that transition metal ion intercalation of Mo2TiC2T... x The structure becomes more porous, significantly increasing its interlayer spacing. The introduction of metal ions can form new metallic bonds, facilitating efficient electron transfer. Electrochemical performance studies revealed that metal-ion-intercalated bimetallic MXenes exhibit excellent electrocatalytic hydrogen evolution performance and good stability.

The invention discloses an MXenes two-dimensional material doped polyimide plastic and a preparation method thereof, and relates to the field of special engineering plastics, the preparation method comprises the following steps: in an inert gas atmosphere, mixing an MXenes powder material, a first solvent, a dispersant and a coupling agent to obtain an MXenes material dispersion liquid; and adding the MXenes material dispersion liquid, a diamine monomer and a dianhydride monomer into a second solvent, and carrying out a polymerization reaction. The MXenes two-dimensional material is introduced into the polyimide engineering plastic mainly through an in-situ polymerization method, so that the surface resistivity and the volume resistivity of polyimide are remarkably reduced, and the polyimide engineering plastic has excellent antistatic performance. Meanwhile, the material can keep inherent high temperature resistance, mechanical strength and wear resistance of polyimide, uniform dispersion of MXenes in a matrix is ensured through a special preparation process, and the process is simple and suitable for industrial production.

The application discloses a method for preparing MXene containing fluorine functional groups by a gas phase method and application, an electrode and a battery thereof, wherein the method uses sulfur hexafluoride gas as an etching agent, the sulfur hexafluoride gas reacts with a MAX phase material to etch the A component in the MAX phase material, and the MXene material is obtained; the MXene material has an accordion-like morphology or a two-dimensional sheet layer morphology; it is found that the SF6 gas can react with the MAX phase material by etching, and it is clear that the SF6 gas first reacts with the A component; based on the finding, by controlling the reaction conditions (time and temperature), the A component in the MAX phase material can be selectively etched, and then the MXene material is obtained, a new etching agent for preparing the MXene is provided, and the preparation technical route of the MXene is expanded. The SF6 gas etching is used to prepare the MXene, the gas is a colorless, odorless, non-toxic and non-combustible stable gas, has high safety, and is suitable for being used as a gas source for industrialized macro-preparation of the MXene material.

The invention provides an ultrafiltration membrane as well as a preparation method and application thereof. The ultrafiltration membrane is prepared from the following raw materials in parts by weight: 15-25 parts of polyvinylidene fluoride; 1 to 5 parts of polyvinylpyrrolidone; 1 to 8 parts of MXene; and 100 parts of a solvent. According to the invention, polyvinylidene fluoride is taken as a membrane base material, polyvinylpyrrolidone with good water solubility is taken as a pore-foaming agent, and an MXenes material is introduced, so that the prepared ultrafiltration membrane has excellent anti-pollution performance, relatively high water flux and rejection rate, good tensile strength and relatively high flux recovery rate.

The application relates to a 3D-CNS@Mo2Ti2C3T x The application relates to a preparation method and application of a composite derivative of MXene, and belongs to the field of secondary battery negative materials. The preparation method comprises the following steps: 3D-CNS is prepared by chemical vapor deposition with ferrocene as a catalyst precursor and 1,2-dichlorobenzene as a carbon source; a multilayer Mo2Ti2C3T x Mxenes; 3D-CNS is used as a flexible substrate, and the multilayer Mo2Ti2C3T x MXene solution is used as an electroplating solution, a platinum sheet is used as a counter electrode, and electroplating is carried out under constant voltage; then, freeze-drying is carried out, sintering is carried out under inert gas protection, and thus, 3D-CNS@Mo2Ti2C3T x The application relates to a composite derivative of MXene. The prepared integrated self-supporting electrode transmits high-power type lithium storage performance with energy type.

This invention provides a few-layer MXenes material and its green, fluorine-free, simultaneous cleavage preparation method, comprising the following steps: reacting the MAX phase material at high temperature in a functional composite salt to achieve simultaneous etching and exfoliation; and obtaining the few-layer MXenes material after washing. This invention develops a functional composite salt for preparing few-layer MXenes materials, avoiding the use of fluorine-containing etchants. It achieves MXene cleavage simultaneously with the etching of A-site atoms, providing a one-step preparation method for few-layer MXenes materials. This method is highly efficient, environmentally friendly, and suitable for industrial production.

The application discloses a preparation method of an electromagnetic shielding film, and comprises the following steps: preparing an MXenes dispersion liquid; dispersing a heat-conducting filler in anhydrous ethanol to prepare a heat-conducting filler dispersion liquid; adding the heat-conducting filler dispersion liquid into the MXenes dispersion liquid to obtain a mixed slurry; and shaping and drying the mixed slurry to obtain the electromagnetic shielding film, wherein the heat-conducting filler is one or a combination of silicon nitride, aluminum nitride, zirconium carbide, tantalum carbide and hafnium carbide. The application further discloses an electromagnetic shielding film. The electromagnetic shielding film prepared by the application has excellent electromagnetic shielding performance, heat-conducting performance, and good flexibility.

The invention discloses an SERS (Surface Enhanced Raman Scattering) sensor as well as a preparation method and application thereof, and relates to the technical field of compound detection, the SERS sensor comprises gold nanoparticles, an MXenes material and bacterial cellulose hydrogel; the gold nanoparticles are loaded on the MXenes material to form a composite nano material; the composite nano material is dispersed and fixed in the bacterial cellulose hydrogel; according to the application, the gold nanoparticles are loaded on the MXenes material, and meanwhile, the MXenes material (Mxene / Au NPs) loaded with the gold nanoparticles is dispersed and fixed in the bacterial cellulose hydrogel, so that a good dispersion and support environment is provided for the Mxene / Au NPs, agglomeration of nano ions is effectively avoided, the SERS sensor is endowed with good aerosol performance, and the SERS sensor has good application prospects. The full contact of a target detection object and the SERS sensor is facilitated, and the detection sensitivity is further improved.

The present invention provides a composite material, a preparation method thereof, and a quantum dot light-emitting diode and a preparation method thereof, relating to the display field. The composite material comprises quantum dots and MXenes, wherein the metal atoms of the quantum dots are connected to the surface groups of the MXenes via coordination bonds. Application of the composite material of the present invention to quantum dot light-emitting diodes can increase the carrier injection rate and enhance the performance of the quantum dot light-emitting diodes.

Provided are: a gas type detection method comprising bringing a plurality of gas sensors into contact with a gas to be detected and, on the basis of a gas response pattern of the plurality of gas sensors, detecting the presence or absence of a specific gas type in the gas to be detected, wherein the plurality of gas sensors have gas-responsive materials that contain MXenes differing in gas responsiveness from each other; a disease detection method; and a MXene production method.

This invention belongs to the field of lithium-ion battery material preparation technology, specifically relating to an MXene-doped silicon-carbon anode material, its preparation, and its application in gel-state soft-pack lithium-ion batteries. This anode material uses non-Ti-based MXenes such as V₂C, Nb₂C, and Mo₂C, utilizing their superior properties compared to Ti₃C₂T. x A lower lithium-ion diffusion barrier and higher theoretical capacity are achieved through strong interfacial bonding via Si–O–M chemical bonds, constructing a dual-network conductive framework. The fabrication process employs a synergistic design of chemical bonding, a dual-network conductive framework, and a gel electrolyte, significantly improving the rate performance of the anode material. The pouch cell with the gel electrolyte achieves 5000 cycles at 1C and 50000 cycles at 5–10C, overcoming the limitations of existing technologies in conductivity and structural stability. This significantly enhances the battery's high-rate performance and ultra-long cycle life from a material composition perspective.

The application belongs to the technical field of new energy material (including ion battery, catalysis, capacitor and the like), and particularly relates to a preparation method of low-temperature MXenes-based in-situ growth CNTs composite material. The method is characterized in that a catalyst is loaded between layers and on the surface of MXenes material, CNTs are in-situ grown between layers of MXenes material under a carbon source atmosphere, and a MXenes / CNT composite material is obtained. By introducing the catalyst, the growth temperature of CNTs is greatly reduced and the CNTs are uniformly distributed. The in-situ growth of CNTs between layers of MXenes increases the layer spacing of MXenes, provides a larger diffusion channel for electrolyte, and improves the specific surface area of the material and provides more electrochemical active sites. The MXenes / CNT composite material prepared by the application has high specific surface area, large layer spacing, higher structural stability, low preparation temperature, adjustable layer spacing and excellent electrochemical performance.