34results about How to "Improve electron emission performance" patented technology

A carbonaceous particle is provided which comprises a hexagonal flake formed of an aggregate of a plurality of nanocarbons and having a side length of 0.1 to 100 mm and a thickness of 10 nm to 1 mm. Thereby, a carbonaceous particle is provided which has an excellent electron emission performance, has a high electron conductivity, shows excellent characteristics particularly when used for a secondary battery, and can suitably be applied to various devices other than a secondary battery as well.

An electronic device in which a substrate with a pair of electrodes is provided and a carbon nanotube is formed or arranged in relation to the electrodes.

In a method of manufacturing a pressed scandate dispenser cathode, firstly, scandium nitrate, barium nitrate, calcium nitrate, aluminum nitrate and ammonium metatungstate (AMT) are dissolved in de-ionized water, respectively, and then mixed with a solution of a cross-link agent such as citric acid and H2O2. After water bathing, the mixed aqueous solution turns into gel, and the powders are obtained after the gel calcination. Secondly, the calcined powders are reduced by hydrogen. Finally, the reduced powders are pressed into shapes and then sintered in the furnace with the atmosphere of hydrogen or by Spark Plasma Sintering (SPS 3.202-MK-V) in vacuum.

A method of preparing a field electron emitter includes preparing an aqueous solution including a carbon nanotube-nucleic acid composite, preparing a substrate to receive the carbon nanotube-nucleic acid composite, and electrophoresis-depositing the carbon nanotube-nucleic acid composite onto the substrate.

Provided is a manufacturing method that allows even a PDP having high-definition cells to exhibit excellent image display performance with reduced power consumption by effectively preventing impurities from adhering to the protective layer. Specifically, in a pre-baking step, a back substrate 9 is baked at a pre-baking temperature. Here, a highest pre-baking temperature is set to be lower than a softening point of a sealing material. The back substrate 9 is superposed on a front substrate 2. Then, a sealing step is performed in a sealing atmosphere prepared by mixing a predetermined amount of a reducing gas with a non-oxidizing gas. The above enables the impurities attributed to organic components due to a sealing material paste to remain as low molecular components, whereby the impurities are evacuated and removed in an evacuating step performed after the sealing step. This prevents adherence of the impurities to the protective layer 8.

The invention discloses a method for manufacturing high-dispersion ultrafine molybdenum-based powder, and belongs to the technical field of rare-earth refractory metal materials. A technological process includes acquiring precursor powder comprising molybdenum oxide, rare-earth oxide (one or two of Y<2>O<3> and La<2>O<3>) or copper oxide which are mixed uniformly by low-temperature combustion synthesis; and reducing the precursor powder in flowing hydrogen atmosphere. The molybdenum oxide and the copper oxide which are easy to reduce are reduced into metal molybdenum and copper, rare-earth oxide particles which cannot be reduced remain, and accordingly high-dispersion ultrafine Mo and rare-earth oxide powder or high-dispersion ultrafine Mo-Cu composite powder is obtained. The weight percent of the rare-earth oxide in the Mo and rare-earth oxide powder ranges from 0.5% to 30%, and the weight percent of the Cu in the Mo-Cu composite powder ranges from 5% to 40%. The method has the advantages that the powder particles are small in diameter and high in surface activity, a dispersion path in a sintering procedure is shortened, and the method is beneficial to acquiring high-density ultrafine-grain / nano-grain molybdenum-based alloy with uniform tissue distribution.

The invention discloses a graphite composite cathode and a manufacturing method thereof. The graphite composite cathode is manufactured by taking graphite powder and / or carbon black powder as a matrix material, taking carbon fibers and / or SiC crystal whiskers as a doping material, and taking mid-temperature pitch as an adhesive. The manufacturing method comprises: (1) matching of a cathode material; (2) preparation of a mixed powdery material; (3) mixing and kneading of the mixed powdery material; (4) forming of the mixed powdery material; (5) impregnating and roasting of a blank; and (6) processing of the cathode. The graphite composite cathode is large in field enhancement factor and good in electron emission performance. The manufacturing method is simple and convenient, and is low in cost.

Provided are a protecting layer for a plasma display panel (PDP), a method of forming the same, and a PDP including the protecting layer. The protecting layer includes a magnesium oxide-containing layer having a surface to which magnesium oxide-containing particles having a magnesium vacancy-impurity center (VIC) are attached. The protecting layer is resistant to plasma ions and has excellent electron emission effects, and thus, a PDP including the protecting layer can be operated at low voltage with high discharge efficiency.

Reduced and low work function materials capable of optimizing electron emission performance in a range of vacuum and nanoscale electronic devices and processes and a method for reducing work function and producing reduced and low work function materials are described. The reduced and low work function materials advantageously may be made from single crystal materials, preferably metals, and from amorphous materials with optimal thicknesses for the materials. A surface geometry is created that may significantly reduce work function and produce a reduced or low work function for the material. It is anticipated that low and ultra-low work function materials may be produced by the present invention and that these materials will have particular utility in the optimization of electron emissions in a wide range of vacuum microelectronics and other nanoscale electronics and processes.

A hollow carbon nanoballoon structure having a relatively large closed space, and a method of producing a carbon nanoballoon structure capable of easily and stably producing such a structure. The carbon nanoballoon structure is obtained by heating soot prepared by an arc discharge using carbon electrodes, soot prepared by vaporizing carbon by laser irradiation, or carbon black having a specific surface area of 1000 m2 / g or more and a primary particle diameter of 20 nm or more at a high temperature in an inert gas atmosphere, and includes graphite sheets linked to form a curved surface.

The invention discloses a core-case cathode transmitting material of fluorescent lamp, which is characterized by the following: adopting (BaSrCa)CO3 powder as core and carbonic acid rare earth as casethrough solid powder method; setting the central grain size of core at 5-10um; increasing the using lift of fluorescent lamp and reducing the light decay of fluorescent lamp greatly; improving the product quality of the fluorescent lamp with little grain size for cathode transmitting material, large specific surface area and high activity.