46results about How to "Reduce the turn-on electric field" patented technology

The invention relates to a preparation method of a double-layer zinc oxide nanowire array. The method comprises the following steps: by using a silicon wafer coated with a zinc oxide crystal seed layer as a substrate, inducing growth of a ZnO nanowire array by chemical vapor deposition; and spin-coating a ZnO nano crystal seed layer on the top end of the primarily grown ZnO nanowire to carry out gas-phase secondary growth of the ZnO nanowire array, thereby obtaining the double-layer superlong ZnO nanowire array. The method has the advantage of simple preparation process; and the prepared double-layer ZnO nanowire array has the advantages of obviously higher length-to-diameter ratio, small starting electric field, and obviously enhanced field emission properties.

The invention relates to a patterning preparation method for a nano array, which is simple and practical and does not need the aid of a catalyst. The patterning preparation method for the nano array deposits a nano array material on a substrate using a metal mesh as a mask. The method can be used for patterning growth of various nano materials, and select proper mask material and specification according to reaction conditions (temperature, atmosphere and the like) and experimental requirements to deposit and synthesize the nano array material on various substrates. Compared with the prior technical routes such as substrate surface modification, electron beam etching technology, magnetron sputtering and the like, the method has the advantages that the method does not need chemical substances to pre-treat the substrate, is environment-friendly, does not need harsh experimental conditions, has low cost, does not need complex process, and has simple operation; raw materials are easily obtained, and grids of various specifications have commercial products; and the method also can be used for preparing various patterning distributed nano array materials in large area.

The invention relates to the technical field of nanometer function device field emission, and provides a 3D graphene / one-dimensional nanomaterial composite structure field emission cathode which comprises a metal foam skeleton substrate, a graphene layer and a one-dimensional nanomaterial layer. The graphene layer is located between the metal foam skeleton substrate and the one-dimensional nanomaterial layer. The graphene layer is used as an electronic transmission layer and used as an emission layer in cooperation with the one-dimensional nanomaterial layer. The invention further provides a preparation method of the 3D graphene / one-dimensional nanomaterial composite structure field emission cathode. The 3D graphene / one-dimensional nanomaterial composite structure field emission cathode has the advantage that metal foam is used as a skeleton to achieve preparation of the graphene / one-dimensional nanomaterial composite structure, and large number of field emission points are provided; graphene is used as both the electronic transmission layer and the emission layer, and excellent properties of graphene are sufficiently utilized; the preparation process is simple, and rapid, uniform and large-area 3D space type field emission cathode preparation can be achieved, and the field emission cathode has low opening electric field, high emission current density and emission current stability, and has the good application prospect.

The invention discloses a preparation method of a graphene oxide field emission flat plate display instrument. The method comprises the following steps: coating a layer of photoresist on a plane substrate; patterning the photoresist, and exposing an area needing preparation of a field emission point on the substrate; plating a metal film; setting nickel nanometer particles on the metal film through magnetic field assistance; performing heat processing in a vacuum furnace; depositing a layer of graphene oxide on the surface of a sample; removing the residual photoresist to obtain a field emission lattice; performing wiring on the field emission lattice; placing an ITO glass sheet plated with fluorescent powder in parallel above the sample, and preparing a field emission flat plate module, wherein the sample and glass are spaced at a certain interval by use of an insulating material; and forming a peripheral circuit by use of a single-chip microcomputer and a shift register to realize screen display. The electron source of the flat plate display instrument prepared by use of the method is a novel field emitter structure, and the flat plate display instrument has the advantages of stable emission currents, small driving voltage, high electron emission efficiency and the like.

The invention discloses a field emission cathode and a preparation method and application thereof. The field emission cathode comprises a conductive substrate, a graphene layer and a molybdenum disulfide and / or tungsten disulfide nanosheet layer, wherein the graphene layer and the molybdenum disulfide and / or tungsten disulfide nanosheet layer are sequentially formed on the surface of the conductive substrate. The preparation method of the field emission cathode, disclosed by the invention comprises the step of forming the graphene layer on the surface of the conductive substrate and the step of carrying out electrophoresis on the surface of the conductive substrate to form the molybdenum disulfide and / or tungsten disulfide nanosheet layer. The field emission cathode disclosed by the invention has the advantages of low turn-on field, large emission current and high stability of emission current. By the preparation method of the field emission cathode, the performance stability of the field emission cathode is ensured, and the production cost of the field emission cathode is reduced.

The invention relates to a field emission cathode structure based on a sea urchin type nickel particle template and a manufacturing method. The field emission cathode structure based on the sea urchin type nickel particle template comprises a metal base electrode layer, the sea urchin type nickel particle template arranged on the base electrode layer and nanometer materials or film, wherein the nanometer materials or the film is coated on the surface of nickel particles. According to the field emission cathode structure based on the sea urchin type nickel particle template, the orientation and the density of distribution of the tip end of a field emission cathode are regulated and controlled by means of the template, field emission performance is improved by means of the nanometer materials coated on the template, and the difficult problem that the performance of field emission parts can not be controlled is solved. The field emission cathode structure based on the sea urchin type nickel particle template is low in working voltage, high in electronic emission efficiency, stable and reliable in emission, and simple in preparation technology.

The invention relates to a preparation method of an N-doped SiC nanoneedle flexible field emission cathode material, and belongs to the technical field of material preparation. The preparation method comprises the following steps: preprocessing an organic precursor; forming a catalyst on a flexible substrate; placing the organic precursor and the flexible substrate in an atmosphere sintering furnace, heating to a temperature of 1700 DEG C to 1800 DEG C for thermal decomposition, then cooling to reduce the temperature to 1000 DEG C to 1200 DEG C, and finally reducing the temperature to a room temperature along with a furnace so as to obtain the N-doped SiC nanoneedle flexible field emission cathode material. According to the invention, preparation of the N-doped SiC nanoneedle flexible field emission cathode material is realized, the prepared N-doped SiC nanoneedle flexible field emission cathode material has a quite low unlatching electric field at different temperatures, and at the same time, the electron emission characteristic is also stable at a high temperature.