129results about "Phosphorus" patented technology

The invention discloses a polydopamine modified black phosphorus, and a preparation method and applications thereof. The polydopamine modified black phosphorus comprises black phosphorus and polydopamine attached to the surface of the black phosphorus. The black phosphorus is coated with a uniform layer of polydopamine, so that the black phosphorus is isolated from oxygen and water vapor completely, and the black phosphorus stability is increased. The polydopamine modified black phosphorus possesses relatively excellent photothermal conversion performance and biocompatibility, is promising tobe applied in the fields such as photoelectric field and biological medical science. The invention also provides a preparation method of the polydopamine modified black phosphorus; the preparation method is simple; yield is high; the polydopamine modified black phosphorus is friendly to the environment; and low cost large scale production can be realized.

The present invention provides a method for producing a solution of nanosheets, comprising the step of contacting an intercalated layered material with a polar aprotic solvent to produce a solution of nanosheets, wherein the intercalated layered material is prepared from a layered material selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal trichalcogenide, a transition metal oxide, a metal halide, an oxychalcogenide, an oxypnictide, an oxyhalide of a transition metal, a trioxide, a perovskite, a niobate, a ruthenate, a layered III-VI semiconductor, black phosphorous and a V-VI layered compound. The invention also provides a solution of nanosheets and a plated material formed from nanosheets.

Preparation of human serum albumin modified black phosphorus quantum dots and applications of the quantum dots as a sensitizer are disclosed. A preparing method of the human serum albumin modified black phosphorus quantum dots includes (1) uniformly dispersing black phosphorus quantum dots into water to obtain an aqueous solution of the black phosphorus quantum dots; and (2) adding an aqueous solution of human serum albumin into the aqueous solution of the black phosphorus quantum dots obtained in the step (1), stirring the mixture, and performing centrifugation to obtain a precipitate that isthe human serum albumin modified black phosphorus quantum dots. The obtained human serum albumin modified black phosphorus quantum dots have a CIK cell therapy sensitizing characteristic, can effectively regulate immune cell cytokine secretion of CIK immune cells, sensitize CIK cells to suppress tumor cell proliferation, have a radioactivity sensitizing characteristic, and cooperate with X rays to inhibit tumor growth. The human serum albumin modified black phosphorus quantum dots can be developed as a novel sensitizer for immunotherapy and radioactive therapy and promote development of novelclinical antitumor medicines.

The invention discloses a method for stabilizing nanometer black phosphorous. The method comprises the following steps: under inert gas shielding, mixing MXene powder and nanometer black phosphorous powder in the mass ratio of (1: 6) to (6: 1), adding the mixture into a solvent for blending, then carrying out separation, and drying the separated materials so as to obtain a nanometer black phosphorous/MXene composite material. Aiming at the disadvantage that the nanometer black phosphorous is easy to oxidize and unstable in structure, the problem can be solved by compounding the nanometer blackphosphorous and MXene, the nanometer black phosphorous and the MXene are presented in a coordination bond (P-Ti) manner, and the single nanometer black phosphorous is stabilized preferably; the method disclosed by the invention is simple in operation, mild in preparation condition, green, environmentally-friendly and low in cost, and the obtained high-stability nanometer black phosphorous can bewidely applied to the fields of energy storages, photoelectrocatalysis, flame retardance and the like.

The invention discloses a carbon material-black phosphorene composite aerogel and a preparation method and application thereof. The carbon material-black phosphorene composite aerogel is formed by mutual winding of a two-dimensional black phosphorus nano-chip mesh and a carbon material mesh. Different from a conventional aerogel preparation method, the method provided by the invention is characterized in that no chemical cross-linking agent is required, the preparation process is simple in step and convenient to operate, saves time, is efficient, and causes no pollution to environments and material surfaces. The prepared carbon material-black phosphorene composite aerogel has a relatively low density, relatively high porosity and specific surface area and a relatively good photothermal conversion effect, combines excellent physical and chemical properties of black phosphorene, functional characteristics of a carbon material and ultralight and porous characteristics of aerogel, and therefore, lays a solid foundation for further expansion of black phosphorene product series and application.

The invention discloses a preparation method and applications for a hydroxyl modified black phosphorus material belonging to the technical field of two-dimensional materials. The preparation method specifically includes the following steps: adding a hydrogen-rich and oxygen-rich inorganic matter and/or a hydroxyl-rich alcohol organic matter into black phosphorus powder; and preparing a hydroxyl modified black phosphorus material through ball milling, washing, centrifugation and drying. Black phosphorus takes red phosphorus as a raw material, and the ultrafine black phosphorus powder is obtained through high-speed ball milling; and the ball milling can be performed under an inert atmosphere. The preparation method is simple in process, low in cost and easy in popularization; and the prepared black phosphorus material has strong stability in air and water and strong dispersion uniformity in the water, and a water-based solution configured by the prepared hydroxyl modified black phosphorus material can have extremely low friction coefficients.

The invention discloses a black phosphorus/manganese dioxide composite nanomaterial as well as a preparation method and application of the composite material. The method mainly relates to the following processes of synthesizing an MnO2 nanosheet by employing bovine serum albumin as a template through biomineralization; carrying out modified regulation on a BP nanosheet until the BP nanosheet with negative charges on the surface has positive charges; tightly combining a black phosphorus nanosheet BP with positive charges subjected to modified regulation and the MnO2 nanosheet with negative charges through the electrostatic adsorption effect to form a BP@MnO2 composite nanomaterial. In addition, the invention further comprises application of the BP@MnO2 composite nanomaterial prepared through the method. The composite material is capable of efficiently generating singlet oxygen under 660nm laser irradiation, and is capable of significantly improving the light stability of a photosensitizer black phosphorus and the apparent photodynamic therapy efficiency, and greatly improving the photodynamic therapy antitumor application of the black phosphorus.

The invention relates to a method for preparing two-dimensional material with atmospheric-pressure plasmas. According to the method, a stripping device with a negative electrode being material crystalis constructed on the basis of an atmospheric-pressure plasma technique, and a two-dimensional crystal wafer is obtained by stripping of the material crystal. Compared with other stripping methods, the method has advantages of simple steps, convenience in operation, short time, high efficiency, freeness of utilization of complex expensive equipment and extra chemical agents and freeness of environmental pollution and material surface contamination and is especially applicable to preparation of two-dimensional black phosphorus materials. In addition, the method can be implemented under normal-temperature normal-pressure conditions, the process is easier to control, and industrial application is benefited.

The invention discloses a method for doping a nano black phosphorus or black phosphorus-based mixed material, which comprises the following steps: uniformly dispersing the nano black phosphorus or black phosphorus-based mixed material in a solvent or salt solution to obtain a suspension; secondly, putting the suspension liquid into a glass reactor, continuously introducing doping gas or not introducing the doping gas in an inert atmosphere, and then carrying out photochemical reaction under uniform-speed stirring; and finally, carrying out solid-liquid separation on the reaction product, and drying the obtained solid to obtain the doped nano black phosphorus or doped black phosphorus-based composite material. The method disclosed by the invention has the characteristics of mild reaction conditions, low cost and large-scale preparation, and the doped nano black phosphorus/black phosphorus-based composite material prepared by the method has a practical prospect in the fields of photoelectrons, field effect transistors, energy storage, catalysis, spraying fertilizers and the like.

The invention relates to a preparation method of a phosphoene-graphene composite material and belongs to the technical field of composite materials. The preparation method comprises the following steps: respectively grinding lamellar black phosphorus and lamellar graphite into powder; adding the powder into a solvent and uniformly mixing to obtain a mixed solution A, wherein the solvent is deionized water, an organic solvent or ionic liquid; carrying out ultrasonic pretreatment on the mixed solution A for 0.5 to 2 hours; emptying air in a high pressure homogenizer by using inert gas, putting the mixed solution A subjected to the ultrasonic pretreatment into the high pressure homogenizer and carrying out high pressure homogenization treatment under the condition that the pressure is 500 to4000 bar for 5 to 60 minutes to obtain suspension; centrifugally separating the suspension to obtain precipitate and supernatant; and carrying out freeze drying or vacuum filtration drying on the supernatant to obtain the phosphoene-graphene composite material. The phosphoene-graphene composite material prepared by the preparation method disclosed by the invention has the advantages of high electrical conductivity, thermal conductivity, flexibility, large specific surface area and high stability; and the method disclosed by the invention has the characteristics of simple operation, high efficiency, capability of realizing continuous operation, low requirements on equipment and the like.

The invention relates to a method for coating surface of black phosphor nano particles with mesoporous silica, which belongs to the fields of biomedicine and a nano material. preparing the black phosphor nano particles; placing the prepared black phosphor nano particles in a shaking table, oscillating the shaking table while adding a proper amount of TEOS (ethyl orthosilicate), repeating the above step after half hour; after a reaction is completed, performing centrifugation cleaning, discharging a supernatant, and re-dispersing the black phosphor nano particles coated with silica in ultra pure water, the black phosphor nano particles coated with silica can effectively alleviate the easy agglomeration characteristic of black phosphor, and the silica for coating the black phosphor nano particles is used for acoustic imaging, drug loading, and biological imaging.

The invention discloses a hydroxylation black phosphorus quantum dot water-based solution preparation method and application. The preparation method specifically comprises the following steps: (1) adding an alcohol organic solvent into black phosphorus and ball milling and centrifugally separating to take liquid supernatant; (2) centrifugally separating or rotary evaporating the liquid supernatantin the step (1) and adding water or an alcohol-water mixture into obtained precipitate to obtain a hydroxylation black phosphorus quantum dot water-based solution. The prepared hydroxylation black phosphorus quantum dot water-based solution disclosed by the invention has the advantages of ultralow friction coefficient, high wear resistance and application to preparing thin film transistor materials, negative electrode materials of batteries, flexible display materials, LED materials, optical switch materials, biosensor material, photodymanic therapy reagents or photo-thermal therapy reagentsand water-based lubricants.

A method for preparing encapsulated red phosphorus is disclosed. The method entails obtaining a material system that contains dispersed particulate red phosphorus having a mean particle size of 0.1 to 100 μm in an aqueous phase that comprise urea, formaldehyde and a water-soluble silicon dioxide precursor, adding to the material system a sufficient amount of acid to lower the pH to 0 to 5 and maintaining the resulting acidic system at a temperature of 80 to 120° C. for a period longer than one hour. The encapsulated red phosphorus of the invention is suitable for using as a flame retarding agent for plastics molding compositions.

The invention discloses a preparation method of an antioxidant black phosphorus nanosheet, and belongs to the field of two-dimensional layered materials. The preparation method comprises the followingsteps: adding black phosphorus nanosheets into an organic solvent to prepare an organic solvent dispersion liquid of the black phosphorus nanosheets, and meanwhile, and preparing a halogenated alkanemodification solution of alkylamine as a surface modifier; mixing the organic solvent dispersion liquid of the black phosphorus nanosheets with the surface modifier to obtain a mixture; placing the mixture in a sealed system heated in an inert atmosphere for reflux reaction; and cooling the mixed solution, carrying out liquid-solid separation, washing, and drying to obtain the antioxidant black phosphorus nanosheet. Dialkyl methylamine is grafted to the surface of the black phosphorus nanosheets through P-C-N bonds, P is directly connected with methylene, dialkylamine is exposed to the outerside, alkylamine oxidation kinetics is slow, and oxidation of the black phosphorus nanosheets can be effectively prevented. Meanwhile, compared with the existing aromatic azide chemical, the dialkyl methylamine is low in price and environment-friendly. The method is suitable for fields such as field-effect transistors and photoelectric detectors.

The invention discloses a large-area thin-layer high-quality black phosphorus nano-sheet and an electrochemical stripping preparation method thereof. The preparation method comprises: taking black phosphorus as a working electrode, and at least constructing an electrochemical reaction system with a counter electrode and an electrolytic solution, wherein the electrolytic solution is an acetonitrilesolution containing tetrabutylammonium ions; and respectively and electrically connecting the working electrode and the counter electrode with a negative electrode and a positive electrode of a powersupply so as to apply a selected voltage between the working electrode and the counter electrode, so that large-area thin-layer high-quality black phosphorus nano-sheets are strip from the black phosphorus. Compared with the black phosphorus nano-sheet in the prior art, the black phosphorus nano-sheet prepared by the electrochemical stripping method of the invention has the following characteristics that the yield is high, the stripped few-layer black phosphorus film is high in proportion, large in area and low in oxygen content, and the preparation process is simple, low in cost, high in safety and suitable for mass production.

The invention discloses black phosphorene aerogel as well as a preparation method and application thereof. The aerogel is inorganic aerogel being of a three-dimensional network structure, and is prepared by means of freeze drying on two-dimensional black phosphorus nanosheets which are dispersed in an organic solvent under ultrasonic assistance. Compared with the conventional aerogel preparation method, the preparation method has the advantage that the aerogel can be formed by means of self-crosslinking assembly among two-dimensional black phosphorus nanosheet layers without use of any chemical crosslinking agent. The preparation process is simple in steps, is convenient to operate, is short in time and efficient, and does not cause pollution on the environment and the material surface. The black phosphorene aerogel has lower density, higher porosity, larger specific surface area and higher photothermal conversion characteristic. The prepared black phosphorene aerogel brings the superior characteristics of black phosphorene and aerogel into full play, and has a very high application prospect in the field of adsorption and energy storage materials.

A multi-atomic layered material and methods of making and using the same are described. The material can include a first 2D non-carbon mono-element atomic layer, a second 2D non-carbon mono-element atomic layer, and intercalants positioned between the first and second atomic layers.

The invention provides a purple phosphorus nanosheet for a lubricant as well as a preparation method and application of the purple phosphorus nanosheet. The preparation method comprises the following steps: adding purple phosphorus powder into an organic solvent to obtain a dispersion liquid, and performing ultrasonic stripping on the obtained dispersion liquid in an inert gas atmosphere; and performing low-speed centrifugation, taking a supernate, performing ultracentrifugation, taking a precipitate, and performing vacuum drying to obtain the purple phosphorus nanosheet for the lubricant. According to the invention, a liquid phase stripping method is adopted to effectively strip a purple phosphorus crystal to obtain the purple phosphorus nanosheet; and the obtained nanosheet is controllable in size and has good lubricating performance.

The invention belongs to the technical field of semiconductor materials, and discloses a two-dimensional material, and a stripping method and application thereof. The two-dimensional material is prepared by the following steps: mixing aggregation-induced emission molecules with a solid material with a multilayer structure, adding a solvent, carrying out grinding, then adding a solvent, carrying out ultrasonic treatment, and carrying out centrifugal filtration. The solid material with a multilayer structure is graphite, hexagonal boron nitride, a transition-metal sulfide, a transition-metal selenide, a transition-metal oxide or black phosphorus. The method has the advantages of short stripping time, simple operation process and high repeatability, and the layers of the prepared two-dimensional material keep the characteristics of single layer or few layers, large layer area, and the like, and the two-dimensional material can be directly used to prepare semiconductor photoelectric devices.

The invention discloses a method for preparing a phosphorene-nitrogen doped carbon composite material. The method comprises the steps that phosphorene and nitrogenous organic compounds are jointly placed into a solution to be uniformly mixed, so that uniformly dispersed suspension liquid is obtained; oxidizing compounds are added into the suspension liquid; reaction is performed for 0.1 to 72h; then, reaction products are subjected to solid-liquid separation; solids obtained through solid-liquid separation are dried, so that a compound precursor is obtained; the compound precursor is put into a high-temperature furnace filled with protection gas to be calcined, wherein the calcining temperature is 500 to 1100 DEG C, and the heat insulation time is 1 to 72h; then, the temperature is lowered to room temperature, so that the phosphorene-nitrogen doped carbon composite material is prepared. The phosphorene-nitrogen doped carbon composite material has good electrical conductivity, thermal conductivity, stability, flexibility, faradaic pseudocapacitance performance and adsorption performance; the operation is simple; the requirements on equipment are low; the product quality is good; the yield is high; the product can be widely applied to the fields of electrocommunication, traffic transportation and the like.

The invention discloses a preparation method of metal-doped nanometer black phosphorus. According to the method, an H-shaped electrolytic tank is adopted; an anode chamber and a cathode chamber are separated by a cation exchange membrane; black phosphorus is fixed on a platinum clamp to be used as a negative electrode; a metal to be doped is used as a counter electrode; a metal salt solution is used as an electrolyte; an electrochemical reaction is carried out under a constant voltage, elementary metal is oxidized into metal cations, the metal cations and H<+> penetrate through the cation exchange membrane and are inserted between cathode black phosphorus layers so as to peel off the black phosphorus and to form phosphide with the black phosphorus; a reaction product is collected, washed and dried to obtain the metal-doped nanometer black phosphorus. The method is simple in process, high in controllability and low in preparation cost, can be used for preparing nanometer black phosphorus doped with different metal elements according to application requirements, and has a good application prospect in the fields of energy storage, catalysis, chemical fertilizers and the like.

The invention relates to a method of preparing nano black phosphorus by black phosphorus stripping through liquid nitrogen and belongs to the technical field of nanomaterials. The method comprises thesteps of adding black phosphorus into the liquid nitrogen in an inert gas atmosphere, performing constant temperature vibration treatment for 0.5-6h at -196 to -100 DEG C to achieve intercalation ofthe liquid nitrogen into the black phosphorus, obtaining black phosphorus/liquid nitrogen dispersing liquid, volatilizing and stripping the black phosphorus from the black phosphorus/liquid nitrogen dispersing liquid to form a black phosphorus stripping substance A, replacing the black phosphorus with the black phosphorus stripping substance A for liquid nitrogen stripping, and performing cycle operation for more than once to form the nano black phosphorus. The method has the characteristics of simplicity in operation, time saving, no expensive and complicated equipment, greenness and environmental protection. The nano black phosphorus prepared by the method can be used for the fields of energy storage, catalysis, sensors, biological medicines and the like.

The invention discloses composite elemental phosphorus with favorable crystallinity and a preparation method and application thereof. The composite elemental phosphorus comprises red phosphorus and black phosphorus and is a brownish black block-shaped particle. The preparation method comprises the steps of 1) performing solvothermal reaction on amorphous red phosphorus and a nitrogen-containing compound in a closed condition; and 2) performing post-treatment on a system solution to obtain the composite elemental phosphorus. The invention further provides the application of the composite elemental phosphorus with favorable crystallinity in a lithium ion battery. The composite elemental phosphorus has excellent crystallinity, specific capacity, structural stability and cycle performance; and moreover, the preparation method has the advantages of simple process, available raw material, low cost, good repeatability and controllable synthesis condition.