759 results about "Black phosphorus" patented technology

The invention discloses a two-dimensional black phosphorus/transitional metal chalcogenide heterojunction based device. The heterojunction adopts a laminated structure of two-dimensional black phosphorus nanometer slices and two-dimensional transitional metal chalcogenide nanometer slices; the number of the two-dimensional black phosphorus layers is 1-50; the two-dimensional transitional metal chalcogenide comprises 1-50 layers in terms of thickness; the two kinds of two-dimensional materials are prepared and synthesized through chemical vapor deposition, mechanical stripping, liquid phase stripping and the like; and the device can be used for preparing a bipolar transistor, a field effect transistor or a photoelectric detector/photoelectric diode. The two-dimensional black phosphorus/transitional metal chalcogenide heterojunction device has the advantages as follows: a combination of the two kinds of two-dimensional materials of black phosphorus and the transitional metal chalcogenide is adopted to form the brand new pn type heterojunction structure; the heterojunction is combined based on natural van der Waals forces among materials; compared with the conventional heterojunction epitaxial growth process, the heterojunction device provided by the invention is easier to prepare; and compared with the existing bulk material, the heterojunction device provided by the invention is smaller in size, thinner, higher in flexibility and higher in the integration degree, so that the two-dimensional black phosphorus/transitional metal chalcogenide heterojunction device has the potential to be applied to the wearable equipment in the future.

The invention discloses a black phosphorus preparation method with a high conversion rate. The preparation method comprises the following steps: mixing red phosphorus, tin and tin tetraiodide in a mass ratio of (1-6):(40-50):(1-2), filling the mixture into a quartz tube, vacuumizing until the pressure in the quartz tube is smaller than 0.05 Pa, sealing the tube, heating to ensure that the raw material end temperature in the quartz tube is 100-400 DEG C, heating to 400-700 DEG C in 1-2 hours, keeping the temperature for 5-10 hours, then cooling to 200-500 DEG C in 6-8 hours, keeping the temperature for 1-3 days, and finally cooling to the room temperature in 10-15 hours to obtain black phosphorus. The preparation method disclosed by the invention is simple in step and strong in operability; on the one hand, a nontoxic raw material is adopted to achieve effects of cleanliness and environmental friendliness, and on the other hand, only a mild reaction condition is needed, so that the energy consumption and cost are reduced, and the prepared black phosphorus has good crystallinity and a high conversion rate. The preparation method disclosed by the invention has strong repeatability and is favorable for industrial popularization and application.

Disclosed is black phosphorus or black phosphorus-carbon composite, which is very suitable for an anode material of lithium rechargeable battery. The black phosphorus or black phosphorus-carbon composite is prepared by using high energy ball-milling, which is easy and efficient way in transforming amorphous red phosphorus into orthorhombic black phosphorus at ambient temperature and pressure.

The invention discloses a black phosphorus/precious metal composite material as well as a preparation method and an application thereof. The black phosphorus/precious metal composite material is a product prepared from precious metal nano-particles and/or precious metal alloy nano-particles through coordinate bond with black phosphorus, black phosphorus is modified with precious metal, so that black phosphorus cannot be oxidized in water and air, and stability of structure and performance of the black phosphorus material is enhanced; compared with the black phosphorus material and the precious metal/precious metal alloy nano-particles, the black phosphorus/precious metal composite material has excellent physicochemical characteristics, and catalytic performance of the black phosphorus/precious metal composite material is better than that of black phosphorus, therefore, the black phosphorus/precious metal composite material can be applied to a wider catalysis field and can be taken as an efficient photocatalyst, an electrocatalyst and an organic catalyst to be applied to the fields of photocatalysis, electrochemistry, organic catalytic reaction and the like.

The invention provides black phosphorus nanosheet and a preparation method and application thereof. The method comprises the following steps: placing black phosphorus powder into anaerobic water to form a dispersion of black phosphorus powder, and selectively controlling pH of the dispersion to alkaline level; carrying out ultrasonic treatment on the dispersion of black phosphorus powder in an inert environment; and after the ultrasonic treatment, centrifuging and collecting a supernatant so as to obtain the black phosphorus nanosheet. The invention also provides the black phosphorus nanosheet prepared by the method and application of the black phosphorus nanosheet. As no organic solvent is used by the method, the prepared black phosphorus nanosheet has no organic solvent residue, will not pollute the environment and can be applied in the field of biomedicine.

The invention belongs to the technical field of chemical material synthesis and electrochemistry and particularly relates to a method for preparing composite materials and black phosphorus of negative electrode materials of a high-capacity lithium-ion battery. According to the method, the black phosphorus of negative electrode materials of the high-capacity lithium-ion battery is synthesized by a high-pressure synthesis method. On one hand, a high-pressure synthesis device is adopted, white phosphorus and red phosphorus are respectively used as raw materials, and pure-phase black phosphorus is synthesized at different pressures and temperatures; on the other hand, the white phosphorus and the red phosphorus are used as raw materials, modified materials are doped, modified black phosphorus is synthesized, the raw materials account for 10 to 90 percent, and the modified materials account for 5 to 50 percent. The black phosphorus prepared by the method is used as the negative electrode materials of the lithium-ion battery, the specific capacity is 3 to 7 times of that of the industrialized graphite negative electrode, the tap density of the black phosphorus negative electrode materials reaches 1.7 to 2.4g/cm<3> and is 2 to 3 times of that of the graphite negative electrode, and the black phosphorus negative electrode has good compatibility with the existing electrolyte and is hopeful to become a new generation of negative electrode materials of the high-capacity lithium-ion battery.

The invention relates to a method for preparing few-layer black scales by ultrasonically stripping a black scale. The method comprises the steps of uniformly mixing black scale powder and an intercalator in an organic solvent according to a given ratio to obtain a mixture, insulating the air, ultrasonically treating the mixture in water bath, and carrying out vacuum suction filtration and vacuum drying to obtain a few-layer black scale material. A series of compounds such as cetyl trimethyl ammonium bromide, phenanthrene and naphthalene are used as the intercalator to prepare the few-layer black scale. Compared with the prior art, the prepared few-layer black scale has advantages of few defects, few impurities, high quality and the like. Meanwhile, the process is simple to operate and low in cost, and the prepared few-layer black scale is expected to substitute the graphene material to be applied to the field of a photoelectric material.

The invention relates to a preparation method and application of a black phosphorus quantum dot and titanium carbide nanosheet composite material. The preparation method comprises the following steps:mixing a single layer or a few layers of Ti3C2 nanosheets with black phosphorus quantum dots dispersed uniformly inside an organic solution, and carrying out simple technologies such as ultrasonic treatment, stirring and drying to obtain the black phosphorus quantum dot and titanium carbide (BPQDs/Ti3C2) nanosheet composite material. The BPQDs/Ti3C2 nanosheet composite material coated on a coppersheet is taken as a working electrode of an energy battery, metal foils are taken as a counter electrode and a reference electrode, a glass microfiber filter membrane is taken as a diaphragm, an organic solution is taken as an electrolyte, and a button battery is assembled inside a glove box filled with high-purity argon. The product can serve as a two-dimensional electrode material, is widely applied to the energy field such as lithium ion batteries, and has excellent charge/discharge performance and cycling stability.

The invention relates to a practical saturable absorption device based on black phosphorus and belongs to the field of saturable absorption devices of laser devices. The practical saturable absorption device based on the black phosphorus is formed by combining four layers of materials or mutual combining three layers of the four layers of materials or combining the four layers of materials combined mutually and functional insertion layers added on the upper portion and the lower portion of the four layers of materials at will or combining the saturable absorption layers and any one layer of materials or combining the saturable absorption layers, and each saturable absorption layer comprises at least one of a black phosphorus film, black phosphorus nano lamella particles, black phosphorus ramifications and functionalization black phosphorus. According to the practical saturable absorption device based on the black phosphorus, the application of Q regulation and mode locking of the laser device, optical signal processing and the like is achieved, and more importantly, the effect that the modulation depth can be flexibly regulated by giving play to the property of the black phosphorus is achieved.

The invention provides a preparation method of a black phosphorus quantum dot. The method comprises the following steps: 1, dispersing black phosphorus with the particle size of 5-50 [mu]m in a first organic solvent to obtain a first dispersion with the black phosphorus concentration of 0.6-1.2 mg/mL; 2, diluting the first dispersion 5-10 times with the first organic solvent, and adding sodium hydroxide to obtain a second dispersion, wherein a mass ratio of the black phosphorus to sodium hydroxide is 0.006-0.012:1; and 3, placing the second dispersion in a closed container, heating and reacting the second dispersion at 120-160 DEG C for 6-18h, cooling the above obtained reaction solution to room temperature, centrifuging the cooled solution, and collecting obtained supernatant to obtain the black phosphorus quantum dot. The method has the advantages of simple process, easiness in operation, high yield, good reappearance, and overcoming of the defects of large dimensions of obtained blck phosphorus sheet materials and low yield in the prior art. The invention also provides the black phosphorus quantum dot.

The invention provides a targeted photothermal black phosphorus nano-preparation, which is prepared from a black phosphorus nano-slice, polyethylene glycol absorbed on the surface of the black phosphorus nano-slice by means of electrostatic attraction, and folic acid connected to the polyethylene glycol by means of an amide bond, wherein one end of the polyethylene glycol is amino, and the other end of the polyethylene glycol is imino; nitrogen atom of the imino and carbonyl carbon atom of the folic acid are connected with each other so as to form the amide bond; the folic acid is exposed at the outermost layer of the nano-preparation. The targeted photothermal black phosphorus nano-preparation is high in stability, good in target recognition ability and excellent in light-heat property, is capable of effectively killing cancer cells, and can be used for performing targeted photothermal treatment on cancers at the cellular level. The invention also provides a preparation method and application of the targeted photothermal black phosphorus nano-preparation.

The invention discloses a black phosphorus nanosheet and antitumor compound containing composite material and a preparation method and application thereof. The composite material is obtained by compounding of black phosphorus nanosheets and an antitumor compound with a primary amino group and/or a phenolic hydroxyl group under the condition that pH is 7.2-7.6. By stirring of the antitumor compound with the primary amino group and the phenolic hydroxyl group under the pH condition, antitumor compound molecules can be electrostatically adsorbed and accumulated on surfaces of the black phosphorus nanosheets, and problems of low load rate of the antitumor compound, antitumor property loss of each component of the composite material and the like can be solved effectively. The composite material is high in antitumor drug load rate and biocompatibility and capable of multi-functionally and synergistically improving antitumor efficiency. In addition, the composite material is low in side effect and easy to degrade.

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 invention discloses a preparation method of black a phosphene nano sheet. The black phosphene nano sheet is prepared by stripping black phosphorus crystals through liquid phase shear force generated by a high-speed rotation cutter head, wherein the whole preparation process is carried out in an argon environment. The preparation method particularly includes the following steps: placing the black phosphorus crystals and an organic solvent in a stirring barrel; setting the rotation speed of the high-speed rotation cutter head; connecting a power supply to drive the high-speed rotation cutter head to rotate in the stirring barrel; setting stripping time to prepare a dispersion liquid of the black phosphene nano sheet; and finally performing centrifugation, filtration and cleaning to obtain clean black phosphene nano sheets. The preparation method is low in cost and has potential of large-scale production.

The invention discloses a constant-temperature large-scale preparing method of belt-shaped black phosphorus to prepare the black phosphorus in a constant-temperature manner. Cheap red phosphorus, tin and iodine are adopted as raw materials and subjected to a solid-phase reaction at a constant temperature under a low pressure to prepare the pure-phase belt-shaped black phosphorus. The method is simple in steps and high in operability. The method is advantageous in that 1) the adopted raw materials are nontoxic so that the method is clean and environmental friendly, 2) tin tetraiodide is replaced by the iodine, thus greatly reducing a cost, 3) the conversion ratio of the black phosphorus is high, and 4) black phosphorus growth is performed with a muffle furnace in place of a tube furnace, so that the yield of the black phosphorus is greatly increased, a single-pass black phosphorus yield only depends on the volume of the muffle furnace, and the single-pass yield is increased by at least 10 times or above than a single-pass yield when black phosphorus growth is performed in a tube furnace. The prepared belt-shaped black phosphorus is characterized in that crystallinity is good, and thin-layer black phosphorus with a large area can be stripped mechanically more easily. The method provides great convenience for subsequent preparation and applications of photoelectric devices based on the black phosphorus.

Relating to new use of nano black phosphorus in the flame retardant field, the invention discloses a nano flame retardant for high polymer materials. The flame retardant is nano black phosphorus withat least a one-dimensional size of 0.5-100nm in a three-dimensional space, and includes black phosphorene, black phosphorus quantum dot, black phosphorus nanowire, black phosphorus nanoribbon, black phosphorus nanotube and other nanoscale black phosphorus products. Adding of the nano black phosphorus into a high polymer matrix material can effectively improve the material microstructure, overcomethe disadvantages of large particle, uneven dispersion, and poor compatibility with a polymer matrix in existing inorganic phosphorus flame retardants and the shortcomings of low phosphorus content, poor heat stability, easy migration, easy volatilization and the like in organic phosphorus-containing flame retardants. Nano black phosphorus has the characteristics of good flame retardant effect, low toxicity, low smoke, no halogen and the like, and is in line with the current green and environment-friendly development trend of flame retardants.

The invention provides nanoscale black phosphorus as well as a preparation method and application thereof. The preparation method comprises the following steps that in protective gas, adding bulk red phosphorus of which the dimension is greater than 0.1cm and stainless steel balls of which the diameters are 6mm-12mm to a high energy ball milling pot in the mass ratio of the bulk red phosphorus to the stainless steel balls being 1 to (20-60), performing sealing, and then performing a ball milling reaction, so as to prepare the nanoscale black phosphorus. The temperature of the ball milling reaction is from room temperature to 60 DEG C, the ball milling rotational speed is 1100r/min-1500r/min, and the ball milling time is 2h-8h. The invention further provides the nanoscale black phosphorus prepared by the preparation method, the particle diameters of the nanoscale black phosphorus are 1nm-5nm. The invention further provides an application of the nanoscale black phosphorus in photoelectric devices, solar batteries, lithium batteries and biomedical science.

The invention discloses a black phosphorus/g-C3N4 composite visible light photocatalytic material. The black phosphorus/g-C3N4 composite visible light photocatalytic material is a product of black phosphorus and g-C3N4 by ball-milling compositing, wherein black phosphorus accounts for 0.5%-50% by weight of g-C3N4. Visible light responding semiconductor black phosphorus is subjected to ball-millingcompositing with g-C3N4 for the first time, and photocatalytic efficiency of g-C3N4 is improved effectively by constructing a heterostructure, so that the prepared black phosphorus/g-C3N4 composite visible light photocatalytic material can be used for degrading organic pollutants, is particularly applicable to degradation of organic photosensitizers and photoinitiators such as rhodamine B and hasgreat application prospect in the field of photocatalytic degradation of organic matter; the black phosphorus/g-C3N4 composite visible light photocatalytic material can be prepared with the ball-milling method, a preparation scheme is simple, and cost is low.

The invention discloses a sensor based on a black phosphorus electrode and a preparation method of the sensor. The preparation method comprises the following steps: 1, preparing black phosphorus; 2, dipping the black phosphorus with an organic solvent; 3, preparing the black phosphorus electrode; and 4, preparing the sensor. According to the sensor based on the black phosphorus electrode, the direct contact between oxygen or oxide and black phosphorus can be prevented, the excellent performances of black phosphorus in the electrochemical detection are exerted, a foundation is laid for the application of the black phosphorus electrode and the sensor based on the black phosphorus electrode, and the sensor and the preparation method thereof have a wide application prospect.

The invention discloses a black phosphorus/graphene heterostructure-based ultraviolet detector and a production method thereof. The detector comprises a substrate, an insulating layer and a black phosphorus/graphene heterostructure, wherein the insulating layer covers the substrate; and the black phosphorus/graphene heterostructure is formed by stacking black phosphorus and graphene and is located on the insulating layer. The disadvantages of the black phosphorus are compensated by the black phosphorus/graphene heterostructure; and the performance of the detector can be improved under the premise of not affecting the advantages of the black phosphorus.

The invention provides a bone implant material as well as a preparation method and application thereof. The preparation method of the bone implant material comprises the following steps: carrying outultrasonic dispersion on black phosphorus and dissolving into a first solvent to obtain dispersion liquid A; dissolving a high polymer material into a second solvent to obtain a solution B; mixing thedispersion liquid A with the solution B and carrying out ultrasonic treatment to obtain a solution of a uniformly-dispersed BP@ high polymer material; injecting the solution into a mold for molding or carrying out three-dimensional printing and molding, and volatilizing the solvent to obtain the bone implant material. The bone implant material has photothermal osteogenesis promoting function andcan be degraded in the physiological environment; when the bone implant material as an implant for a bone defect filling part is applied to clinical treatment of bone defect, the efficiency of promoting osteogenesis with heat by penetrating through biological tissues through near infrared can be improved; besides, the bone implant material also can be combined with clinical physiotherapy so as tobetter promote the healing effect of the bone defect; meanwhile, a biodegradable product of the bone implant material is essential for a human body and can participate in bone healing and regenerationprocess.

The invention relates to a method for preparing orthorhombic black phosphors monocrystals. The method comprises the following steps: mixing a phosphorus raw material, elemental Sn and a mineralizer SnI4, placing the obtained mixture in a quartz tube, carrying out vacuum pumping and high temperature sealing, placing the sealed quartz tube in a muffle furnace, and carrying out optimized temperature programming and cooling to prepare black phosphorus. Black phosphorscrystals obtained in the invention have the advantages of large size, good crystallization performance and high purity, and the preparation method has the advantages of low device requirements, easy realization, and provision of great convenience for subsequent black phosphorus application and development.