85 results about "Plasma effect" patented technology

Provided is a surface Raman and infrared spectroscopy double-enhanced detecting method based on graphene and nanogold compounding.According to the method, light sources, a lens, a graphene nanobelt and gold nanoparticle composite substrate, an infrared Fourier spectrograph and a Raman spectrometer are included.Infrared light waves and visible light waves emitted by the infrared light source and the laser light source respectively pass through a beam combiner and then irradiate the graphene nanobelt and gold nanoparticle composite substrate, after the light waves and trace molecules adsorbed on the substrate interact, reflected light is gathered by the focusing lens to enter the infrared Fourier spectrograph, and meanwhile scattered light is gathered into the Raman spectrometer.Raman scattering signals of the trace molecules can be enhanced through the local area plasma effect of the gold nanoparticles, and meanwhile infrared absorption spectrum signals of the trace molecules can be dynamically enhanced through the graphene surface plasma effect within the broadband range.According to the method, double enhancement of surface Raman and broadband infrared spectroscopy signals is achieved on the same substrate, and the advantages of being wide in enhancement wave band, high in detecting sensitivity, wide in detected matter variety range, good in stability and the like are achieved.

The invention relates to a method for preparing a pyramid array on a monocrystalline silicon substrate, and belongs to the technical field of manufacture of photovoltaic and semiconductor devices. The method comprises the following steps of: covering microballons in periodic arrangement on the surface of a monocrystalline silicon piece, and annealing near the glass transition temperature point of the microballoon; in oxygen atmosphere, obtaining a microballoon array in separation arrangement after etching by use of inductive coupling plasma; depositing a metallic titanium membrane on the monocrystalline silicon piece uniformly by a physical vapor deposition manner; and putting a silicon wafer with a masking film into an alkaline solution containing a surfactant for corrosion so as to obtain the pyramid array in order arrangement. The method is simple in process, short in preparation period and mature in technology; and three structures such as a positive pyramid array, an inverted pyramid array and a positive and inverted pyramid combined array can be obtained by a method for preparing a template through selecting and fine turning. The method has wide application value in the fields of photovoltaic, magnetic memory devices, nano photoelectric devices, nano sensors, surface raman enhancement and surface plasma effect and the like.

An arc-electrolysis steam generator apparatus and method of use thereof, wherein the steam generator comprises an arc-plasma electrolysis process utilizing a high pressure vessel and electrodes exposed to high frequency, high energy pulses. An inductor is placed around an arc-electrolysis unit, wherein the inductor captures electromagnetic energy and a plasma effect that produces high electrical energy pulses generated by the plasma arc performing work against its own magnetic field; thereby, supplementing the steam energy recovered from water.

The invention belongs to the field of luminescent materials, and discloses a preparation method of a ZnO nano-rod array. The preparation method comprises the following steps of: cleaning a substrate; preparing a ZnO seed layer precursor solution; preparing a ZnO seed layer; preparing the ZnO nano-rod array; and preparing adsorption metal nano-particles of the ZnO nano-rod array. For the ZnO nano-rod array provided by the invention, the metal nano-particles are introduced to the surface of each ZnO nano-rod, and the luminescent efficiency of the ZnO nano-rods is increased by using the surface plasma effect of the metal nano-particles so as to obtain the ZnO nano-rod array with excellent ultraviolet emission performance; meanwhile, the preparation method is simple in process, needs no expensive equipment, and is low in cost.

The present invention relates to an ultra high speed preparation method for an ultra thick diamond-like coating. According to the method, a plasma immersion ion injection and high density plasma chemical vapor deposition integration technology is adopted to achieve ultra high speed deposition of an ultra thick diamond-like coating on various sample substrates such as stainless steel, aluminum alloy, titanium alloy, copper, ceramics and the like, wherein a deposition rate is 80-140 nm / min. The method comprises: firstly performing silicon or nitrogen immersion ion injection on a sample substrate, and adopting high density plasma effect alternating deposition to periodically change silicon content in a diamond-like coating in mixing atmosphere of silane, acetylene and argon to finally obtain the ultra thick diamond-like coating with a thickness of 8-30 mum on the sample substrate. The obtained ultra thick diamond-like coating has characteristics of high film substrate binding strength, low friction coefficient and long service life.

The invention discloses a method for enhancing electroluminescence of a zinc oxide-gallium nitride (ZnO-GaN) heterostructure. By means of a vapor transport method, a zinc oxide nanorod array is prepared on a p type GaN(p-GaN) substrate to construct a n-ZnO-p-GaN heterostructure; by means of a magnetron sputtering method, metal aluminum nanoparticles are modified on the surface of the ZnO nanorod array to form a n-ZnO-p-GaN composite system modified by the aluminum nanoparticles. Due to the local surface plasma effect of the metal aluminum nanoparticles, the spontaneous radiation property of a ZnO nano array is enhanced, and the internal quantum efficiency of the heterostructure is improved. The effective method is provided for constructing high-property photoelectric devices. Meanwhile, a series of problems like low light emitting efficiency caused by mismatching of a lattice structure and an energy band structure of a heterostructure on an interface are solved, and the method has huge potential application in the photoelectric technical field in the future.

The invention provides a surface plasma effect based InGaAs optical detector allowing absorption enhancement. The surface plasma effect based InGaAs optical detector allowing absorption enhancement comprises a semiconductor substrate and a buffer layer, a lower doping layer, an absorption layer and an upper doping layer which are sequentially deposited on the semiconductor substrate and a metal grating layer which is formed in the upper doping layer; the metal grating layer is the two-dimensional periodical sub-wavelength optical grating; incident optical waves enters into from one semiconductor side with no thin film deposited on; two electrodes of the InGaAs infrared optical detector are connected electrically with the lower doping layer and the upper doping layer; additional bias voltage is introduced through the two electrodes; detected signals are collected through the two electrodes. According to the surface plasma effect based InGaAs optical detector allowing absorption enhancement, a two-dimensional periodical metal hole array structure can be in coupling with detected optical waves to simulate the surface plasma effect, the surface plasma effect can localize light fields at positions close to metal and semiconductor interfaces, and the lost detection rate of the thinned absorbing layer is recovered.

The invention provides a difunctional visual light responding catalyst, and a preparation method and application thereof, and can solve the problems that the catalyst has poor activity and stability and the performance study on the catalyst is only limited to the field of pollutant degradation in the prior art. The difunctional visual light responding catalyst has an expression formula of Ag coated AgX, and consists of silver nanoparticles and silver halide, wherein the silver nanoparticles are attached to the surface of the silver halide; silver is 4 to 15 mass percent; and X is Cl or Br. The invention also provides a preparation method and application of the visual light responding catalyst. The prepared catalyst is uniform in particle size and regular in appearance, and the silver nanoparticles are distributed uniformly on the surface of the catalyst; due to a plasma effect of the silver, the catalyst has quick visual light response, can efficiently reduce CO2 and degrade organic dyes to show double functions, and has high activity and stability.

The invention discloses an InGaAs infrared polarization detector based on a surface plasma effect. The detector comprises a substrate, a lower doping layer, an absorbing layer, an upper doping layer and a metal grating layer, wherein the lower doping layer, the adsorbing layer, the upper doping layer and the metal grating layer are down-up successively deposited on the substrate. The metal grating layer is a two-dimensional sub-wavelength asymmetrically-structured grating, and used for receiving incident light waves. The absorbing layer is used for absorbing light waves. The upper doping layer and the lower doping layer are used for leading out two electrodes of the infrared polarization detector. According to the invention, by use of the two-dimensional sub-wavelength asymmetrically-structured grating, the detector can be coupled to detected light waves to stimulate the surface plasma effect; through the surface plasma effect, the light filed can be localized in the place near the metal and a semiconductor, so efficiency of the detector can be improved; and the electromagnetic vibration strengths generated under irradiation of the incident light in different polarization directions of the asymmetric grating structure are different, so polarized light detection can be achieved.

The invention provides an InGaAs infrared photodetector. The InGaAs infrared photodetector comprises a semiconductor substrate of which both faces are polished, and a lower doped layer, an absorption layer, an upper doped layer and a metal grating layer deposited in sequence on the semiconductor substrate, wherein the absorption layer is an intrinsically-doped or low-concentration-doped InGaAs material; the metal grating layer is a one-dimensional periodic sub-wavelength grating; the lower doped layer and the upper doped layer are heavily-doped InGaAs materials of different doping types, and construct a pin structure with the absorption layer respectively; the two electrodes of the InGaAs infrared photodetector are electrically connected to the lower doped layer and the upper doped layer respectively, and are used for introducing external bias voltage and collecting detection signals. According to the InGaAs infrared photodetector, a surface plasma effect and a Rayleigh-Wood abnormity effect are excited by using a one-dimensional periodic metal grating, thereby increasing the response speed of a device under the condition of not losing the absorptivity.

The invention relates to an all-organic one-dimensional photonic crystal based on surface plasma effect and a preparation method, belonging to the technical field of photonic crystals. The invention provides the all-organic one-dimensional photonic crystal formed by alternately stacking organic polymer membranes and organic polymer membranes with uniformly dispersed nano particles, the multilayered membrane structure presents the excellent band gap characteristic, i.e. the corresponding broad band width can reach 80 nm when the transmission rate is 0.0 percent, the band gap central wavelength position (the central wavelength can be tuned in a range from visible light to near-infrared light) can be controlled by adjusting the thickness of the membrane layer so as to suit different application requirements. Corresponding to a traditional inorganic photonic crystal prepared through vacuum films, the all-organic one-dimensional photonic crystal has greatly simplified preparation process and greatly decreased material and equipment costs, and the material can be prepared into the membrane to prepare a large-area device by using a sol making method.

The invention discloses a novel nano-material composite visible light catalyst and a preparation method thereof, and belongs to the field of fine chemicals. The catalyst comprises the following components in percentage by weight: 0.5 to 5 percent of elemental silver, 5 to 9.5 percent of silver halide, and 90 percent of mesoporous molecular sieve MCM-41 as a carrier. The catalyst has a novel shell-core nanometer structure, and is a visible light catalyst based on metal plasma effect and semiconductor photocatalytic effect. The catalyst is applicable to the fields of environmental pollution control and new energy development, has significant effects of degrading pollutants in water and producing hydrogen through water photolysis, is a catalytic material meeting the requirements of protecting environment and saving energy, overcomes the disadvantages that the prior photocatalyst is poor in the utilization ratio of visible light, low in catalytic activity, difficult to recycle and the like, and is worthy to be developed and applied.

The invention relates to a fluorescent material and a preparation method thereof. The fluorescent material comprises a fluorescent powder main body and metallic nanoparticles doped in the fluorescent powder main body. The general formula of the fluorescent material is (Mn*Zn(1-x))2SiO4:M, wherein, M is at least one selected from the group consisting of Ag, Au, Pt and Pd nanoparticles, 0.02<=x<=0.15, and the mole ratio of M to the fluorescent powder main body (Mn*Zn(1-x))2SiO4:M is in a range of 3.73*10<-6> to 1.5*10<-3>. According to the invention, precious metallic nanoparticles are doped in zinc manganese silicate; surface plasma effects generated by the metallic nanoparticles are utilized to enhance the luminescent property of fluorescent powder; internal quantum effects generated by the metallic nanoparticles enable luminescent efficiency of fluorescent powder to be improved. The preparation method has the advantages of a simple process and low requirements for equipment; fluorescent powder prepared after the metallic nanoparticles are doped has a greatly improved luminescent property.

The invention relates to a membrane electroluminescent device, which comprises an indium tin oxide (ITO) conducting glass layer, a first insulating layer, a luminescent layer, a second insulating layer and a metal electrode layer which are arranged sequentially, wherein a metal layer with an aperiodic micro-nano structure is arranged between the luminescent layer and the second insulating layer; surface plasma effect can be generated on an interface between the metal layer with the aperiodic micro-nano structure and the luminescent layer; and by the plasma effect, the luminescent effect of the luminescent layer can be enhanced to increase luminescent intensity and improve the electroluminescent efficiency of the device. The invention also provides a preparation method for the membrane electroluminescent device correspondingly.

The invention discloses a metal grating surface plasma effect biological-detection chip for a THz-TDS system.The metal grating surface plasma effect biological-detection chip is economical and practical and free of marking and has the advantages of high detection speed and high detection precision.As biological aqueous samples are detected according to resonance peaks of SPR (Surface Plasmon Resonance), humidity requirements to detection environment is lower than that of the way of directly transmitting the samples according to conventional terahertz time-domain spectroscopy.With the open type design, the chip can be reused since different parts thereof can be detached and cleaned.The metal grating can be made of aluminum so that mass production with high economical efficiency and practicability can be achieved.Since the samples do not need to be marked, use of special equipment for adding samples is avoided, and only tiny injectors are needed in use, and accordingly operation is simplified.

A method for enhancing photosynthesis spectral intensity of an LED phosphor by using plasma is realized by employing metal surface plasma effect. A light source emitting blue-violet light is employed, and blue-violet light irradiates on a metal film to generate surface plasma effect, which interacts with emit photons of the phosphor, so that intensity of photosynthesis spectrum emitted by the phosphor is enhanced. The method comprises the following steps: 1) placing a glass substrate in a sputtering cavity, carrying out sputtering deposit on a metal target, and carrying out heat treatment in nitrogen to prepare an insular metal nano film; 2) dispersing the LED phosphor in a dispersing agent to form a phosphor solution, coating the phosphor solution on the glass substrate with the metal nano film prepared on by spin coating and obtaining a phosphor / Ag chemiluminescence system. The invention has advantages of simple technology, low cost, simultaneous increase of red and blue light andilluminating enhancement proportion controlled by metal sputtering time, and is easy for practice and beneficial for popularization and application.

The invention belongs to the technical field of functional polymer film materials, and relates to preparation and application methods of a flexible composite film with a sterilization function. The flexible composite film is prepared by adopting an electrostatic self-assembly technology. The method comprises the steps of firstly preparing a flexible polydimethylsiloxane film; preparing silver nanoparticles by using silver mirror reaction in the flexible film; and adsorbing a polyelectrolyte layer and a fluorescent conjugated polyelectrolyte for sterilization. The flexible composite film has the beneficial effects that the preparation process is simple and convenient, no complicated equipment is needed, the ability of the fluorescent conjugated polyelectrolyte for generating reactive oxygen species is strengthened by the surface plasma effect of the silver nanoparticles in the film; and the film has very good sterilization ability and has good flexibility, and has a good application prospect in the field of food safety and medical hygiene, etc.

The invention discloses a mixed plasma effect assisted slot waveguide TE mode polarization analyzer which successively comprises, from bottom to top, a silicon-base substrate, a buried oxide layer, apolarization analysis component, and an upper cladding layer, wherein the buried oxide layer is grown on the upper surface of the silicon-base substrate, the upper cladding layer covers the upper surface of the buried oxide layer, the polarization analysis component is horizontally grown on the upper surface of the buried oxide layer and covered by the upper cladding layer, and comprises an inputwaveguide, a transition waveguide A, a through waveguide, a transition waveguide B, an output waveguide, and a right through waveguide. The slot waveguide TE polarization analyzer has the advantages of low insertion loss, a high extinction ratio, a large manufacturing tolerance, and a large operating bandwidth.

The invention discloses a photocatalytic material Ag / AgMO2 and a preparation method thereof. The photocatalytic material is polyhedral and is a composite structure formed by elementary substance Ag nanoparticles and AgMO2, wherein M is Ga, Al or In, and the grain size of the material is 0.2-1 micron. In addition, the novel photocatalytic material Ag / AgMO2 (M=Ga, Al or In) is prepared by a two-step method, and the method comprises the following steps of: firstly, preparing NaMO2 (M=Ga, Al or In) by a solid phase method, and then synthesizing the Ag / AgMO2 (M=Ga, Al or In) by using the prepared NaMO2 as a precursor and introducing superfluous Ag-containing compound. The preparation method of the photocatalytic material provided by the invention is unique in process, simple in preparation process and easy to operate; the prepared Ag / AgMO2 (M=Ga, Al or In) has plasma effect, and is capable of enhancing absorption to visible light, and also the Ag nanoparticles are capable of effectively capturing photoelectrons; as a result, the number of electrons compounded with holes is reduced, and more photoholes are converted into the hydroxyl radicals with oxidizing ability; and the photocatalytic efficiency is greatly improved.

The invention discloses a broadband efficient GaN-based LED chip based on surface plasma effect and a preparation method thereof. The broadband efficient GaN-based LED chip is an inversion structure, and successively comprises a substrate, a buffer layer, an unintentional doping GaN layer, a n-GaN layer, a quantum well layer, an electronic barrier layer, a p-GaN layer, a metal reflector layer, a passivation layer, a p-electrode layer, a n-electrode layer, a p-electrode hole and a n-electrode hole from bottom to top. The bottom face, connected with the surface of the p-GaN layer, of the metal reflector layer is provided with a micron-nano compound metal structure. The micron metal structure comprises alternately installed bulge part and groove part. The bulge part is extended to the adjacent place of the quantum well, and the efficient SP-MQW coupling is realized. The p-GaN surface is covered by the groove part, so the p-GaN layer has enough thickness for injecting the hole. The nano-metal structure is distributed on the division surface of the micron-metal structure and the p-GaN.

The invention belongs to the technical field of solar cells and relates to a contacting passivation crystalline silicon solar cell structure and preparation method. Double face polishing of an N or P type crystal silicon wafer is performed and then double face silicon oxide layer or aluminum oxide preparation is performed; than double face golden or silver nano particle preparation is performed; back face non-crystalline silicon N (P) type layer preparation is performed; light receiving face quasi crystalline state P (N) type silicon film preparation is performed; 70 nm thick ITO film and grid electrode is prepared on the P (N) type silicon film; and back face silver film preparation is performed. The invention has beneficial effects that metal nano particles wrapped by a passivation coating realizes an effect of a carrier tunneling channel, so that the carrier tunneling channel effect is improved, the fill factors of a crystalline silicon solar cell can be increased integrally and the surface plasma effect of the metal nano particles realizes an antireflection effect.

The invention discloses novel nanoparticles with core-shell structures. A preparation method comprises the following steps: (1) adding CTAB solution into a container, adding HAuCl4 solution, and then adding NaBH4 solution to obtain seed crystal; adding the CTAB solution into another container, sequentially adding the HAuCl4 solution, silver nitrate solution, L-AA solution and the seed crystal to prepare gold nanorods; (2) carrying out DNA modification on the gold nanorods to obtain gold nanorods stably protected by thiolated DNA; and (3) centrifuging the gold nanorods, dissolving the gold nanorods in the CTAB solution, sequentially adding SDS solution, the silver nitrate solution and the L-AA solution, and standing to obtain the novel nanoparticles with the core-shell structures. The nanoparticles disclosed by the invention are high in stability, thin silver covers the two ends of each core-shell structure, most of each connected DNA single strand is exposed outside, and each tip part has a higher surface plasma effect; and the nanoparticles have a high application value in the fields of bio-optoelectronics, biological nanometer detection and the like.

A task of the invention is to provide a sensibilizer for a solar cell, which restrains diffusion of metal to a power generating layer. Furthermore realization of higher conversion efficiency based on near-field light which is generated according to surface plasma resonance of metal nanometer particles can be expected. The sensibilizer for the solar cell according to the invention and a sensibilizing layer which comprises the same are characterized in that the sensibilizer for the solar cell is a metal nanometer particle which is provided with a transparent layer on the surface and has surface plasma effect. The sensibilizing layer for the solar cell can be formed through a wet type coating method.

The invention belongs to the technical field of polymer solar cells, and particularly relates to an organic solar cell based on the polyfluorene cathode interface self-assembly anode plasma resonance effect and a preparation method of the organic solar cell. According to the method, an amphipathic polyfluorene material with high conductivity serves a cathode transmission layer, interface contact with ITO is increased through self-assembly of the cathode transmission layer, the cathode transmission layer replaces a traditional TiO2 or ZnO inorganic transmission layer, interface combination is reduced, and the performance of the organic solar cell is improved; meanwhile, a vacuum evaporation method is adopted for directly arranging a layer of gold nanoparticles on an active layer in an evaporation mode, light scattering is increased by utilizing the surface plasma effect of the layer of gold nanoparticles, the light path is increased, then the light utilization rate is increased, and thus the performance of a device is improved. The efficiency of the organic solar cell is effectively improved through the method, and the method is of great reference significance for nanoimprint lithography and development of organic solar cells in the future.

The invention discloses a three-dimensional orderly macropore InVO4-BiVO4 supported noble metal nanometer photo-catalyst, a preparation method and application of the photo-catalyst, belonging to the technical fields of photo-response catalysts and nanometer function materials. According to the photo-catalyst, InVO4-BiVO4 with 3DOM (Three-dimensional Orderly Macropore) structure is taken as a carrier; InBi-3D supported M novel metal is prepared by using a bubbling reduction method under the protection of PVA (Poly Vinyl Alcoho) or PVP (Poly Vinyl Pyrrolidone). A preparation method of the photo-catalyst comprises the following steps: (a) preparing a noble metal solution by taking HAuCl4 or PdCl2 as a noble metal source and taking polyvinyl alcohol as a protective agent or taking AgNO3 as a noble metal source and taking polyvinyl pyrrolidone as a protective agent; (b) adding the noble metal solution into NaBH4 and preparing M metal sol; (c) adding InBi-3D into the M meal sol and bubbling in the dark; and (d) filtering, washing and drying. The catalyst has the 3DOM structure, a heterogeneous structure and a plasma effect and can be used for efficiently degrading organic dye such as rhodamine B, methylene blue or a mixture of the rhodamine B and methylene blue.

A precious metal plasma effect enhanced up-conversion fluorescence structure-based method for the hypersensitive detection of a vascular endothelial growth factor relates to the fields of nano-materials and analytical chemistry. A standard curve between the intensity of a fluorescence signal and the concentration of the vascular endothelial growth factor is established through synthesizing up-conversion nano-particles (NaYF4, Yb, Tm) with the particle size of 27.1 nm, synthesizing gold nano-particles with the particle size of 4.6 nm, modifying the up-conversion nano-particles, wrapping the gold nano-particles, carrying out single-strand DNA modification on the up-conversion nano-particles, carrying out single-strand DNA modification on the surface of the gold nano-particles, serially regulating a spacing between the particles, and carrying out enhanced regulation and intensity detection on the up-conversion fluorescence signal. Compared with traditional detection methods, the fluorescence enhanced signal-based method for detecting the vascular endothelial growth factor has the advantages of low background, high sensitivity, convenience, fastness and very good practical application prospect.

A system for reducing plasma induced communication disruption is disclosed. The system utilizes an electrophilic gas injectant, bent reentry vehicle nose shaping and a number of flaps configured to provide 3-axis steering capability. Injecting electrophilic gas injectant into plasma accomplishes reduction of plasma induced communication disruption by removing free electrons in the plasma which causes the communication disruption. For reentry vehicles, a bent biconic nose also reduces plasma effect during reentry. By combining electrophilic gas injection and bent nose shaping, the system reduces and / or eliminates plasma induced communication disruption, such as, GPS communication blackout, for a reentry vehicle during reentry. Furthermore, the 3-axis steering capability renders the reentry vehicle more maneuverable. Performance of the reentry vehicle during reentry, such as, target accuracy, is thus improved.

The invention belongs to the technical field of nanometer material preparation and hydrogen preparation catalysts, and particularly relates to a method for producing hydrogen from water through photoelectrocatalysis decomposing, a used plasma catalyst, and a preparation method and application of the plasma catalyst. The catalyst is a composite material with metal nanoparticles loaded on a carbon nanomaterial. The plasma catalyst can be used for producing hydrogen from water through photoelectrocatalysis decomposing; the photoelectrocatalysis hydrogen production overpotential of the catalyst can reach 99mV (when the current density reaches 10mA cm<-2>), and is lowered by about 100mV than the overpotential without the introduction of light source and without the plasma effect; the photoelectric current is 8 times of that without the plasma effect; the effect of producing hydrogen from water through photoelectrocatalysis decomposing of the catalyst is obviously improved; the energy efficiency is reduced.

The invention discloses an organic electroluminescent device, which relates to the technical field of organic electroluminescent display. The organic electroluminescent device including the anode, anorganic layer, a cathode and a light extraction layer; the organic layer is located between the anode and the cathode, the organic layer includes a light emitting layer, The light extraction layer islocated on a side of the cathode away from the anode, the light extraction layer sequentially comprising a first light extraction layer and a second light extraction layer from a side close to the cathode, the first light extraction layer containing a compound represented by Formula I, and the second light extraction layer containing a compound represented by Formula II. The organic electroluminescent device of the invention not only improves the transmittance of the cathode surface, but also greatly reduces the influence of the surface plasma effect and the waveguide effect, and improves thelight-emitting efficiency of the organic electroluminescent device because of the low light absorption coefficient and the high refractive index of the materials used in the first light-emitting layerand the second light-emitting layer.

The invention discloses a preparation method of a B4C nanosheet and the B4C nanosheet. The preparation method comprises: 1) taking boric acid, coal dust and sodium carbonate or sodium bicarbonate to conduct ball-milling to obtain mixed powder, wherein the adding mass of sodium carbonate or sodium bicarbonate accounts for 3%-10% of the total mass of boric acid and coal dust; 2) subjecting the obtained mixed powder to pre-press molding, and then performing cold isostatic pressing to obtain flake object; and 3) imbedding the obtained flake object into quartz sand to conduct microwave sintering, thus obtaining the B4C nanosheet. According to the method, boric acid, coal dust and sodium carbonate or sodium bicarbonate are subjected to ball-milling mixing, pre-press molding and cold isostatic pressing are carried out, then the product is subjected to microwave sintering, by utilizing the excellent wave-absorbing properties of carbon and the plasma effect of gas during microwave sintering, the method realizes rapid synthesis of B4C nanosheet. The obtained B4C nanosheet has good crystallinity, small thickness, and high yield and purity; the sintering time is short, the sintering temperature is low, and a lot of energy is saved. The process is simple, is convenient to operate, and is suitable for industrial rapid production, thus having broad application prospects.