摘要:
An electron emitter retaining a stable electron emission property with minimized fluctuation over a long period of time is provided. Also, a long-life image display apparatus that exhibits little fluctuation over a long period of time, by using electron emitters that retain a stable electron emission property with minimized fluctuation over long period of time is provided.
摘要:
An electron-emitting cathode (6) consists of an electrically conducting emitter layer (7) attached to a side wall (2) which consists of stainless steel and a gate (9) which is fixed at a mall distance inside a concave emitter surface of the emitter layer (7). The cathode (6) surrounds a reaction area (3) containing a cylindrical grid-like anode (5) and a central ion collector (4) which consists of a straight axial filament. An ion collector current (lie) reflecting the densitiy of the gas in the reaction region (3) is measured by a current meter (11) while a gate voltage (VG) is kept between the ground voltage of the emitter layer (7) and a higher anode voltage (VA) and is regulated in such a way that an anode current (IA) is kept constant. The emitter layer (7) may consists of carbon nanotubes, diamond-like carbon, a metal or a mixture of metals or a semiconductor material, e.g., silicon which may be coated, e.g., with carbide or molybdenum. The emitter surface can, however, also be a portion of the inside surface of the side wall roughened by, e.g., chemical etching. The gate (9) may be a grid or it may be made up of patches of metal film covering spacers distributed over the emitter area or a metal film covering an electron permeable layer placed on the emitter surface.
摘要:
A device and method are provided for producing negatively charged nanoparticles. The device is comprised of an electron supermicroemitter and which are connected with a power supply, respectively. The potential of the electron supermicroemitter to the ground is controlled in the range of negative 2Kv to 29Kv by the power supply and the controller in accordance with the shape, size and different application of the materials of the emitter, so as to form field electron emitting of tunneling effect. The energy of electrons with high current density produced by the emitter can be adjusted during the electrons' colliding with particles in air aerosol such that the electrons are attached to the nanoparticles of different size with wider energy band to form negatively charged nanoparticles.
摘要:
A vacuum tube for amplifier circuit includes: a light incidence window that transmits signal light; a photoelectric conversion unit that converts the signal light transmitted through the light incidence window into photoelectrons; an output unit that has an anode, on which the photoelectrons are incident, and outputs a signal corresponding to the incident photoelectrons; and a grid electrode that is disposed in a path of the photoelectrons from the photoelectric conversion unit to the anode and controls the amount of photoelectrons incident on the anode.
摘要:
An anode (1) in a field emission light source (15) is disclosed. The anode (1) comprises an electrically conductive layer (3) and a luminescent layer (5) that is luminescent when excited by electron bombardment (7) caused by a potential difference (9) between the electrically conductive layer (3) and a cathode (11). Key features are that the luminescent layer (5) is arranged between the electrically conductive layer (3) and the cathode (11) and that the electrically conductive layer (3) is a transparent electrically conducting layer (3). Further, a field emission light source (15) comprising the anode (1) is also disclosed.
摘要:
A flexible mold (10) having a mold layer (11) that is provided on the surface thereof with a groove pattern (4) of specified shape and size, is constructed such that the mold layer contains a lithium salt of an organic fluorine compound as an antistatic agent.
摘要:
The application discloses methods of processing particulate carbon material, such as graphitic particles or agglomerates of carbon nanoparticles such as CNTs. The starting material is agitated in a treatment vessel in the presence of low-pressure (glow) plasma generated between electrodes, e.g. between a central electrode and an outer rotating conductive drum containing the material for treatment. Preferably the material is agitated in the presence of conductive contact bodies such as metal balls, or other contact formations with relatively high specific surface area, on the surface of which plasma glow is present and amongst which the material to be treated moves. The methods are found to effectively deagglomerate nanoparticles, and to exfoliate graphitic material to produce very thin (few-layer or monolayer) graphitic sheets showing graphene-type characteristics. The resulting deaggregated or exfoliated carbon nanomaterials are an aspect of the disclosure, as is their use dispersed in composite materials, e.g. conductive polymeric composites for electric or electronic articles and devices. The particle surfaces can be functionalised by choosing appropriate gas in which to form the plasma. The invention is advantageous in using safe, dry and moderate conditions to achieve a high degree of deaggregation or exfoliation compared with previous aggressive chemical methods such as acid treatment.
摘要:
An electron-emitting cathode (6) consists of an electrically conducting emitter layer (7) attached to a side wall (2) which consists of stainless steel and a gate (9) which is fixed at a mall distance inside a concave emitter surface of the emitter layer (7). The cathode (6) surrounds a reaction area (3) containing a cylindrical grid-like anode (5) and a central ion collector (4) which consists of a straight axial filament. An ion collector current (lie) reflecting the densitiy of the gas in the reaction region (3) is measured by a current meter (11) while a gate voltage (VG) is kept between the ground voltage of the emitter layer (7) and a higher anode voltage (VA) and is regulated in such a way that an anode current (IA) is kept constant. The emitter layer (7) may consists of carbon nanotubes, diamond-like carbon, a metal or a mixture of metals or a semiconductor material, e.g., silicon which may be coated, e.g., with carbide or molybdenum. The emitter surface can, however, also be a portion of the inside surface of the side wall roughened by, e.g., chemical etching. The gate (9) may be a grid or it may be made up of patches of metal film covering spacers distributed over the emitter area or a metal film covering an electron permeable layer placed on the emitter surface.
摘要:
An electron-emitting cathode (6) consists of an electricaly conducting emitter layer (7) attached to a side wall (2) and a gate (9) which is fixed at a mall distance inside a concave emitter surface of the emitter layer (7). The cathode (6) surrounds a reaction area (3) containing a cylindrical grid-like anode (5) and a central ion collector (4) which consists of a straight axial filament. An ion collector current (I IC ) reflecting the densitiy of the gas in the reaction region (3) is measured by a current meter (11) while a gate voltage (Vc) is kept between the ground voltage of the emitter layer (7) and a higher anode voltage (V A ) and is regulated in such a way that an anode current (T A ) is kept constant. The emitter layer (7) may comprise an array of metal, e.g., nickel or molybdenum tips or consist essentially of a semiconductor material like silicon, preferably coated by, e.g., carbide, diamond-like carbon or molybdenum, or of carbon nanotubes or it may be a roughened surface portion of the side wall surface. The gate (9) may be a grid or it may be made up of patches of metal film covering spacers distributed over the emitter area or a metal film covering an electron permeable layer placed on the emitter surface.