95 results about "Tungsten disulfide" patented technology

The invention relates to the technical field of materials, in particular to preparation of an amphiphilic tungsten disulfide nano material and application of the amphiphilic tungsten disulfide nano material in preparation of an oil displacement agent. The oil-displacing agent prepared from the amphiphilic tungsten disulfide nano material can reduce the interfacial tension of an oil-water interface, and can be quickly adsorbed to the oil-water interface to layer oil and water; the surface wettability of the rock is changed, the lipophilicity of the rock is changed into weak hydrophilicity, and the pore throat cannot be blocked due to excessive hydrophilicity while the oil phase is stripped. The nano oil-displacing agent disclosed by the invention can still have an enough stable use effect after being frozen at a low temperature and then unfrozen.

The invention provides a long-acting lubricating method for forming transition metal sulfide on the surface in situ, and belongs to the technical field of friction chemical synthesis and lubrication. The preparation method comprises the following steps: mixing an active sulfur-containing hydrogen bond donor with a hydrogen bond acceptor to obtain a sulfur-containing eutectic solvent; a sliding friction pair is formed by a substrate material and a pair, the sulfur-containing eutectic solvent is added to a contact area of the sliding friction pair and reaches an immersed state, friction is carried out, and the substrate material contains transition metal elements. Based on a friction chemical reaction mechanism, a sulfur-containing eutectic solvent is used as an active sulfur source, and stress and heat of a friction interface are utilized to develop a system for carrying out in-situ vulcanization reaction on the surface containing transition metal elements to generate transition metal sulfide with a lubricating property; the problem of performance degradation caused by friction loss and difficulty in supplement of transition metal sulfides such as molybdenum disulfide and tungsten disulfide in the use process of the traditional lubricant is solved, and the service life of a lubricating system is greatly prolonged.

The invention provides a perovskite / silicon laminated solar cell and a preparation method thereof. The perovskite / silicon laminated solar cell comprises a silicon substrate cell, a hole transport layer, a perovskite light absorption layer, an electron transport layer, a functional layer and an electrode which are sequentially laminated, the material of the electron transport layer comprises tungsten disulfide, and the material of the perovskite light absorption layer comprises a rare earth doped perovskite material. The perovskite / silicon laminated solar cell has high charge transmission capability and space environment endurance capability, is especially suitable for space scenes such as near-earth orbit satellites, and has high stability and environment adaptability.

The invention discloses a width gradient tungsten disulfide nanobelt, a preparation method thereof and an application of the width gradient tungsten disulfide nanobelt in a self-driven photoelectric detector, a Ni film is deposited on a substrate and is annealed to form catalytic particles, and a chemical vapor deposition system is utilized to accurately control the temperature gradient between tungsten trioxide in a central temperature zone and a growth substrate in a downstream temperature zone, so that the width gradient tungsten disulfide nanobelt is obtained. And the solid sulfur source is propelled at a constant rate, the dynamic change of the sulfur / tungsten atomic ratio in the reaction environment is regulated and controlled, and a growth mode is guided to be converted from a gas-liquid-solid mechanism to a gas-solid mechanism, so that controllable preparation of the tungsten disulfide nanobelt with the width continuously and progressively decreased in the axial direction is realized. The width of the nanobelt gradually changes from 150-500 nm to 50-120 nm, the length of the nanobelt reaches 3-12 [mu] m, and the nanobelt has an armchair edge and a 3R phase stacking structure. A self-driven photoelectric detector constructed based on the nanobelt realizes high-sensitivity detection of 532 nm laser under zero bias voltage, the responsivity reaches 5.04 A / W, the detectivity reaches 3.23 * 10 < 12 > Jones, and the nanobelt shows important application value in the fields of optical signal detection, optical switches and wireless optical communication.

The invention relates to the technical field of sliding materials for seismic mitigation and isolation supports, and particularly discloses a self-lubricating wear-resistant composite material for a building seismic mitigation and isolation support and a preparation method of the self-lubricating wear-resistant composite material. The self-lubricating wear-resistant composite material for the building shock absorption and isolation support comprises the following raw material components: aliphatic polyketone, polytetrafluoroethylene, high polystyrene resin modified methyl vinyl silicone rubber, silicone resin, solid lubricating particles, silicone oil, a compatilizer, an antioxidant, a stabilizer and a coupling agent. The solid lubricating particles comprise the following raw material components: tungsten disulfide and hexagonal boron nitride. The self-lubricating wear-resistant composite material for the building shock absorption and isolation support prepared by the invention can keep a low and stable friction coefficient and excellent wear resistance for a long time, the dependence on external lubricating grease is remarkably reduced, and the technical problems that the self-lubricating performance of an existing support material is quickly attenuated, the maintenance is frequent and the cost is high are solved.

The invention discloses a p-type tungsten disulfide nanotube bundle, a preparation method thereof and application of the p-type tungsten disulfide nanotube bundle in a photoelectric detector with adjustable light response linearity, and the method comprises the following steps: depositing an Au film on a SiO2 / Si substrate, and carrying out annealing to form a zero-dimensional Au nanoparticle catalytic layer; the method comprises the following steps: respectively placing tungsten trioxide (WO3) powder and sulfur (S) powder in different areas of a single-temperature-area tubular furnace, heating to 850-1000 DEG C in an Ar / H2 mixed gas low-pressure atmosphere, and reacting to generate a WS2 nanotube bundle with a multi-wall hollow structure; the obtained material has a cluster-shaped morphology in dense interlaced distribution, and shows stable p-type conductive characteristics. A photoelectric detector prepared based on the material has high responsivity (2.7 * 10 < 4 > A / W), high detection rate (1.6 * 10 < 13 > Jones) and quick response (15 ms) in a wave band of 375-1550 nm, and keeps stable performance in a range of 10-300 K. The method is simple in process, the growth process of the tungsten disulfide nanotube bundle can be accurately controlled, the polarity of tungsten disulfide is changed to be p-type, and large-scale preparation can be achieved.

The invention discloses a room-temperature DMMP sensor based on a platinum diselenide van der Waals heterojunction, and relates to the technical field of gas sensing. The sensor comprises an electrode, a platinum diselenide layer loaded on the surface of the electrode and a nano material loaded on the surface of the platinum diselenide layer, wherein the platinum diselenide layer and the nano material form a Van der Waals heterojunction; wherein the nano material is a low-dimensional nano material such as a carbon nano tube, graphene, zinc oxide, molybdenum disulfide or tungsten disulfide. The platinum diselenide / Van der Waals heterojunction sensor realizes trace detection of dimethyl methylphosphonate (DMMP) at room temperature by using excellent performance of platinum diselenide and a synergistic effect of the Van der Waals heterojunction, has the advantages of low working temperature, high sensitivity, good stability, high response speed and the like, and can meet DMMP detection requirements in the fields of environmental monitoring, public safety and the like.

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.

The application relates to a high-temperature heavy-load long-life knuckle bearing and belongs to the technical field of knuckle bearings. The knuckle bearing comprises a lubricating structure arranged between an outer ring and an inner ring; the first base material of a left half outer ring and a right half outer ring is Al 0.5 CoCrFeTa 0.4 Ni 2.1 High-entropy alloy is used for balancing strength and toughness and improving high-temperature mechanical property stability; the second base material of the inner ring is AlCoCrFeTa 0.8 Ni 2.1 High-entropy alloy; the inner ring and the outer ring are provided with an ion implantation layer, a CrAlN coating and an Ag coating; the surface hardness of the inner ring and the outer ring is improved, the bonding force between the CrAlN coating and the base is improved, frictional resistance is reduced, heat generated in the bearing operation process is led out, the solid lubricant material of the lubricating structure is tungsten disulfide which is filled in a groove; a continuous and stable lubricating transfer film is formed on a friction surface, and the service life is improved.

This invention discloses a SnS / WS2@C composite electrode material, its preparation method, and its application, belonging to the field of tungsten disulfide nanomaterials technology. A precursor solution A is obtained by uniformly dispersing SnCl2·2H2O and CH3CSNH2 in anhydrous ethanol. After a solvothermal reaction, precursor solution A is cooled, centrifuged, washed, and freeze-dried to obtain powder B. Powder B, WCl6, and CH3CSNH2 are uniformly dispersed in anhydrous ethanol to obtain solution C. After a solvothermal reaction, solution C is cooled, centrifuged, washed, and freeze-dried to obtain powder D. Powder D is uniformly dispersed with glucose in deionized water to obtain precursor solution E. After a solvothermal reaction, precursor solution E is cooled, centrifuged, washed, and freeze-dried to obtain powder F. Powder F is calcined at high temperature to obtain the SnS / WS2@C composite electrode material. Performance testing of the prepared SnS / WS2@C composite electrode material revealed that it exhibits good electrochemical performance when used as a negative electrode in potassium-ion batteries.

The invention discloses a cushion block composite layer for a semiconductor, a preparation method and a cushion block, the cushion block composite layer sequentially comprises a composite coating and a surface microstructure from a substrate close to beryllium copper to a position far away from the substrate, and the composite coating sequentially comprises a chromium transition layer, an alpha-diamond-like carbon layer and a self-lubricating layer doped with tungsten disulfide from a position close to the substrate to a position far away from the substrate. Hard metal carbide reinforced phase crystal grains are uniformly distributed in the alpha-diamond-like carbon layer; the surface micro-texture comprises a plurality of pits, and each pit is filled with a nano-particle solid lubricant; through the structure, the cushion block is compatible with the high process temperature, an additional cooling device is not needed, and the interface shear stress of the composite layer is reduced, so that the copper powder falling amount is greatly reduced, the hardness, the wear-resisting life, the wear-resisting particle penetrability and the high recognition accuracy of the cushion block are greatly improved, and the low friction coefficient of the surface is maintained; and the roughness is still kept at a lower level after the lead frame is carried for multiple times.

The invention discloses a viscosity modified material for keeping the homogeneity of self-compacting concrete, a preparation method and application. The material comprises the following components in parts by mass: fly ash, slag powder, metakaolin, cellulose ether, limestone powder, zeolite powder, an air entraining agent, a functional component A and a functional component B, wherein the functional component A is prepared by compounding and drying nano silica fume, modified carbon nanotubes subjected to ultrasonic dispersion by sodium dodecyl benzene sulfonate / absolute ethyl alcohol and tungsten disulfide subjected to activation-silanization-polycarboxylic acid modification treatment, and the functional component B is prepared by shearing and uniformly mixing magnesium oxide and a calcium expanding agent at a high speed. The material can improve the viscosity, delay segregation and bleeding and reduce the water use sensitivity under the condition that the yield stress is not obviously improved, meanwhile, the early strength development is promoted, the volume stability is improved, and the durability such as chloride ion permeation resistance is improved, so that the homogeneity and quality consistency of a component in the pouring process and after hardening are guaranteed.

The invention discloses a preparation method of a nanoscale tungsten disulfide colloidal suspension, which belongs to the field of tungsten disulfide preparation, and comprises the following steps: step 1, adding tungsten disulfide powder into a solvent, and adding a surfactant or a stabilizer to obtain a mixed solution; step 2, carrying out tungsten disulfide interlayer stripping treatment on the mixed solution to generate a suspension containing nanosheets or nanoparticles with the transverse size of less than 100nm and the thickness of less than 5nm; 3, the suspension liquid obtained after ultrasonic treatment is subjected to centrifugal treatment, and supernate serves as preliminarily purified nanometer tungsten disulfide dispersion liquid; step 4, adjusting the pH value of the nano tungsten disulfide dispersion liquid to 7-8, and adding a polymer stabilizer to enable the absolute value of the Zeta potential of the system to be greater than 30mV; step 5, performing impurity removal and filtration on the suspension to remove residual micron-sized impurities; 6, the obtained filtrate is the prepared stable nanoscale tungsten disulfide colloidal suspension, and the stable nanoscale tungsten disulfide colloidal suspension is packaged into a preset container to be stored.

The invention belongs to the technical field of oil reservoir recovery efficiency improvement, and particularly discloses an amphiphilic Janus tungsten disulfide nano-emulsification tackifier and a preparation method and application thereof.The preparation method comprises the following steps that firstly, tungsten disulfide and a first oxidizing agent are added into a first solvent, and then tungsten disulfide with the surface modified with hydroxyl is obtained; thirdly, adding a second solvent and a first modifier, and then adding a first catalyst to obtain carboxyl modified tungsten disulfide; and finally, adding into a second solvent, and reacting with a second modifier and a third modifier to obtain the tackifying Janus tungsten disulfide nanosheet. The viscosity of the displacement front can be remarkably improved in the middle and later periods of oil reservoir development, the swept volume and the oil displacement efficiency are improved, the viscosity increasing rate of crude oil reaches 1192%, the excellent interfacial tension reducing capacity is achieved, the recovery efficiency is improved by more than 20%, and the recovery efficiency improving effect is remarkable.

The invention discloses a titanium trisulfide / tungsten disulfide heterojunction photoelectric detector for weak light detection and a preparation method and application of the titanium trisulfide / tungsten disulfide heterojunction photoelectric detector, and belongs to the technical field of micro-nano photoelectric device manufacturing. The photoelectric detector is sequentially provided with a silicon dioxide / silicon substrate, a titanium trisulfide nanosheet / tungsten disulfide nanosheet heterojunction and a metal electrode layer from bottom to top, the titanium trisulfide layer and the tungsten disulfide layer are partially overlapped, and two ends are respectively provided with a metal electrode. According to the photoelectric detector, titanium trisulfide and prepared tungsten disulfide form a heterojunction, the photoelectric detection performance under visible light is improved, the photoelectric detector has high response under irradiation of low-power-density visible light, and the heterojunction photoelectric detector fully embodies the advantages of the photoelectric detector under irradiation of weak light; and strong response detection under weak light is realized.

The invention relates to a method for manufacturing a component (1) comprising a metallic base body (2) with at least one coating (3) arranged at least partially on it, comprising the following steps: - Providing a metal strip (2a), - Providing at least one coating bath (5, 5') and at least partially passing the sheet metal strip (2a) through the at least one coating bath (5, 5'), wherein the sheet metal strip (2a) is electroplated, - wherein the coating (3) is formed by optionally forming a first layer (3a) of nickel on the sheet strip (2a), and by forming at least one second layer (3b) of a tin-nickel alloy in which particles (4) in the form of graphite and / or molybdenum disulfide and / or tungsten disulfide and / or polytetrafluoroethylene are incorporated, directly on the sheet strip (2a) and / or on the optional first layer (3a), and - Forming a coated area of ​​the sheet metal strip (2a) by means of a deep drawing process, whereby the component (1) is simultaneously or subsequently cut out of the sheet metal strip (2a).

The utility model discloses a helicopter self-lubricating swashplate which comprises a swashplate outer ring, a swashplate outer ring bearing is installed inside the swashplate outer ring, a swashplate inner ring is installed inside the swashplate outer ring bearing, and a fisheye bearing is installed inside the swashplate inner ring. A moving ring substrate of the fisheye bearing is of a honeycomb structure, and the honeycomb structure is filled with a graphite nanosheet and tungsten disulfide mixed lubricant. According to the new technology, a swash plate moving ring substrate is of a copper-based material surface structure and a honeycomb structure, and the honeycomb structure is internally pre-filled with a graphite nanosheet and tungsten disulfide mixed lubricant. And the overall shape is a fisheye sphere, so that the lubricating degree and the operating performance can be kept in a high-strength environment of multi-degree-of-freedom composite action.

The application discloses a quasi-solid-state sodium battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium metal batteries. The quasi-solid-state sodium battery electrolyte provided by the application comprises a photocuring agent, a sodium ion electrolyte and a two-dimensional material; the two-dimensional material comprises one or more of fluorinated graphene, titanium nitride, boron nitride, silicon disulfide, tungsten disulfide and silicon carbide. The quasi-solid-state sodium battery electrolyte provided by the application has good mechanical strength and mechanical stability, can reduce the resistance of the quasi-solid-state sodium battery electrolyte, and improve the ionic conductivity; when the quasi-solid-state sodium battery electrolyte is applied to a sodium metal battery, the sodium metal battery has higher specific capacity under small and large rates, and can maintain long-time cycle stability.

The invention belongs to the technical field of lithium battery fire extinguishing materials, and particularly relates to an inorganic fullerene type sulfide-containing potassium-based fire extinguishing agent for lithium battery fire disasters, which comprises the following components: inorganic fullerene type sulfide, a mixture of polysiloxane and polyimide, a mixture of potassium carbonate and potassium phosphate, and alumina nanoparticles, a polyethylene glycol dispersant; wherein the inorganic fullerene type sulfide is inorganic fullerene type tungsten disulfide IF-WS2 or inorganic fullerene type molybdenum disulfide IF-MoS2 or a mixture of the inorganic fullerene type tungsten disulfide IF-WS2 and the inorganic fullerene type molybdenum disulfide IF-MoS2. The inorganic fullerene type IF-WS2 and / or IF-MoS2 are / is introduced into the fire extinguishing agent, and the combination technology of the potassium-based compound (potassium carbonate and potassium phosphate) and the polymer matrix (polysiloxane and polyimide) is combined, so that the comprehensive performance of the fire extinguishing agent in a lithium battery fire disaster is remarkably improved, and the fire extinguishing requirements of various scenes are met; and the fire prevention and control safety of the lithium battery is fundamentally improved.

The present disclosure provides a modified positive electrode material and a preparation method and application thereof, the preparation method comprising the following steps: (1) mixing tungsten disulfide with a tannic acid solution, performing ultrasonic treatment, and then separating to obtain a TA-WS2 nanosheet solution; (2) mixing a positive electrode material with a solvent after performing corona discharge treatment, to obtain a positive electrode material solution, mixing the positive electrode material solution with the TA-WS2 nanosheet solution, and obtaining a mixed solution; (3) performing solid-liquid separation treatment on the mixed solution, and performing calcination treatment on the obtained solid material, to obtain the modified positive electrode material. The present disclosure prepares nanoparticles with strong electronegativity, simultaneously charges the positive electrode material particles, utilizes the interaction force between the strong electronegativity and electrons, makes the nanoparticles with strong electronegativity uniformly and spontaneously loaded on the charged particles, and finally forms a uniform coating layer on the surface of the positive electrode material through calcination.

The invention relates to the technical field of lubricating additives, in particular to a lubricating nano additive as well as a preparation method and application thereof. The lubricating nano additive provided by the invention is of a core-shell structure; the core is a modified nanotube; the modified nanotube is an L-cysteine modified molybdenum disulfide nanotube, a 3-mercaptopropylamine modified molybdenum disulfide nanotube, a cysteine modified molybdenum disulfide nanotube, an L-cysteine modified tungsten disulfide nanotube, a 3-mercaptopropylamine modified tungsten disulfide nanotube or a cysteine modified tungsten disulfide nanotube; the carbon nano tube is one or more of a carbon nano tube modified by L-cysteine, a carbon nano tube modified by 3-mercaptopropylamine and a carbon nano tube modified by cysteine; the shell is one or more of a fluorinated covalent triazine skeleton, a perfluorinated triazinyl covalent organic framework and a fluorinated metal-triazine coordination polymer; the core and the shell are bonded through a chemical bond. The lubricating nano additive has excellent dispersion stability and high-temperature friction performance.

The present application relates to a method for preparing single-layer MoS2 / WS2 two-component gradient material by one-step method, and belongs to the field of inorganic nano semiconductor materials. Sulfur powder is compacted on one side of a corundum boat with a spoon, and the corundum boat containing the sulfur powder is sealed with aluminum foil paper. A small hole is punched on the side containing the sulfur powder with a thin steel needle, and then the corundum boat containing the sulfur powder is placed in the upstream low-temperature zone of a multi-zone tube furnace. A mixture of tungsten oxide powder and NaCl and molybdenum oxide powder are placed separately in the upstream of a long corundum boat, and a substrate is placed in the downstream of the long corundum boat. Then the long corundum boat is placed in the downstream high-temperature zone of the multi-zone tube furnace. With the adjustment of the temperature of the downstream high-temperature zone of the multi-zone tube furnace and the adjustment of the amount of NaCl, single-layer MoS2 / WS2 two-component gradient materials of different sizes are prepared. The present application can prepare single-layer MoS2 / WS2 two-component gradient materials with controllable size. The prepared samples have good crystallinity, stable chemical and thermodynamic properties, and good application prospect.

The invention relates to a tungsten disulfide nano-multilayer composite film with long service life in a space strong irradiation environment and a preparation method of the tungsten disulfide nano-multilayer composite film, and belongs to the technical field of surface engineering. Comprising a Ti or Cr transition layer and a nanometer alternating layer which are sequentially arranged on a metal matrix from bottom to top. The nanometer alternating layer is repeatedly alternated by taking a layer of Ti-WS2 film and a layer of Ag-Cu film as a cycle from bottom to top. The nano multilayer structure design is adopted, the internal interface density of the nano multilayer film is extremely high, and interstitial atoms generated by irradiation cannot quickly escape to the surface of the material. Ag-Cu soft metal not only has good radiation resistance, but also has good ductility, crack propagation is facilitated in the wear process, stress is reduced, and Ti-WS2 and Ag-Cu nano multilayer have synergistic lubrication and radiation resistance effects.

The invention relates to the field of rare earth materials, in particular to a directional impurity removal method for rare earth metal and rare earth metal prepared thereof.The directional impurity removal method comprises the steps that tungsten disulfide powder is added into the rare earth metal to be subjected to directional impurity removal according to a preset proportion, and a first mixture is obtained; performing first heating on the first mixture in a vacuum environment to obtain a second mixture; performing second heating on the second mixture until the second mixture is evaporated and then condensed to obtain a third mixture; the third mixture is rare earth metal subjected to directional impurity removal. Tungsten disulfide is added into rare earth metal, a thermal decomposition reaction is carried out under vacuum and high temperature, tungsten and sulfur are released, sulfur makes contact with oxygen element impurities in the floating process to generate SO2 gas to be discharged out of a melt by utilizing the difference of forming energy and binding energy, tungsten is combined with impurities such as iron, nickel and silicon, directional regulation and control of the impurities are achieved, the volatile quality of the impurities is changed, and the mechanical property of the alloy is improved. The purification efficiency and the impurity removal range of the vacuum distillation technology are effectively improved.

This invention relates to the field of polymer composite materials technology, specifically to a high wear-resistant cable material based on carbon fiber reinforcement and its preparation method. The material comprises the following raw materials in parts by weight: 40-60 parts impact-resistant copolymer polypropylene, 15-20 parts carbon fiber, 8-15 parts additive A, 8-12 parts additive B, 4-6 parts plasticizer, and 1.5-2 parts antioxidant. In this invention, additive A, through a carbon sphere precursor and modified bismuth selenide, constructs a reinforced wear-resistant structure, inhibiting interfacial debonding and particle shedding during friction, while simultaneously improving the overall rigidity and scratch resistance of the material. This structurally enhances the wear life and mechanical stability of the cable material. Additive B, prepared by combining tungsten disulfide and polyvinylidene fluoride-hexafluoropropylene copolymer-based additives, forms a self-lubricating wear-resistant network, improving the wear resistance, aging resistance, and dimensional stability of the cable material under dynamic friction and complex working conditions.

This invention relates to the field of sliding materials for seismic isolation bearings, specifically disclosing a self-lubricating wear-resistant composite material for building seismic isolation bearings and its preparation method. The self-lubricating wear-resistant composite material for building seismic isolation bearings comprises the following raw material components: aliphatic polyketone, polytetrafluoroethylene, high-styrene resin modified methyl vinyl silicone rubber, silicone resin, solid lubricating particles, silicone oil, compatibilizer, antioxidant, stabilizer, and coupling agent; the raw material components of the solid lubricating particles include tungsten disulfide and hexagonal boron nitride. The self-lubricating wear-resistant composite material for building seismic isolation bearings prepared by this invention can maintain a low and stable coefficient of friction and excellent wear resistance over a long period, significantly reducing dependence on external lubricating grease, and solving the technical problems of rapid decay of self-lubricating performance, frequent maintenance, and high cost of existing bearing materials.

This application provides a flexible nitrogen dioxide gas sensor based on tungsten disulfide and its fabrication method. The sensor includes a flexible substrate, a flexible electrode, and a tungsten disulfide sensitive film. The flexible electrode is disposed on the same plane of the flexible substrate, and the source and drain adopt an arrayed interdigitated electrode structure. The tungsten disulfide sensitive film covers the channel region between the source and drain, and there is a gap between it and the gate. When a gate voltage is applied, the gate modulates the carrier concentration in the tungsten disulfide channel of the tungsten disulfide sensitive film through a lateral electric field, thereby adjusting the sensitivity to nitrogen dioxide detection. The fabrication process is simplified, and high sensitivity, fast recovery, and flexible wearable adaptation are achieved simultaneously without material modification or external assistance.

The application belongs to the technical field of photoelectric regulation, and particularly relates to a composite resonant cavity structure of MDM nanocavity coupled two-dimensional transition metal sulfide based on Fano resonance and a preparation method thereof. The application provides a composite resonant cavity structure of MDM nanocavity coupled two-dimensional transition metal sulfide based on Fano resonance, in the MDM nanocavity, the material of the dielectric layer comprises one or more of hexagonal boron nitride and indium tin oxide, and the two-dimensional transition metal sulfide comprises tungsten disulfide. The MDM nanocavity comprises, in sequence, a metal layer a, a hexagonal boron nitride layer, an indium tin oxide layer and a metal layer b; and the material of the metal layer comprises one or more of silver, titanium, chromium and gold. The application adopts the optical film system design idea and the efficient preparation method of the MDM nanocavity coupled TMD atomic layer, and produces a multi-path tunable optical reflection spectrum Fano resonance. The quality factor and intensity of the Fano resonance of the application are far ahead of those of other similar structures.

This invention provides a carbon ceramic disc brake pad and its preparation method, comprising an inner layer and an outer layer. The inner layer contains the following raw materials in parts by weight: 30 parts reinforcing fiber and 20-24 parts binder. The outer layer contains the following raw materials in parts by weight: 30 parts reinforcing fiber, 16-20 parts binder, 8-12 parts modified disulfide, and 2-4 parts methyltrimethoxysilane. The modified disulfide includes at least one of graphene-modified molybdenum disulfide and carbon nanotube-modified tungsten disulfide. Water-guiding microgrooves are provided on the friction surface of the outer layer. The carbon ceramic disc brake pad provided by this invention maintains a friction coefficient stable above 0.40 in the low-temperature range of -20℃ to 50℃ and under humid conditions, with friction coefficient fluctuation controlled below 0.06, and a wet friction coefficient attenuation rate ≤10%.

The application discloses a lubricating coating for high-temperature fasteners and a preparation method and application thereof. The lubricating coating is prepared by using inorganic phosphate as a binder, nano boron nitride, silver powder, molybdenum disulfide and tungsten disulfide as composite lubricants, antimony trioxide as an antioxidant, nano silicon dioxide as a phosphate binder reinforcing agent, water and anhydrous ethanol as a dispersion medium, and propargyl alcohol as a corrosion inhibitor. The coating is immersed or sprayed on the fastener, and a coating is formed after a certain curing condition. The coating has good adhesion, flexibility and impact resistance, and has no corrosion defects such as pitting, cracking and bubbling after an acetate salt spray test (AASS) for 240 hours. According to the locking torque test in accordance with HB 7687-2001, the locking torque requirement is met after 15 cycles at room temperature and 5 times of warm loading and then air cooling to room temperature. The application has a good application prospect in the field of high-temperature fastener coatings.