Abstract:
A triple-point cathode coating and method wherein electrically conductive NEA diamond particles cast or mixed with the adhesive medium and electrically insulative NEA diamond particles are cast or mixed with the adhesive medium to form a plurality of exposed junctions between electrically conductive diamond particles and electrically insulative diamond particles to reduce any electrical charges on a structure coated with the coating.
Abstract:
A field-emission type electron source includes (i) a single-crystal tungsten rod having a sharpened terminus and (ii) a mass of ZrO formed only on a portion of the surface, or the entire surface, of the sharpened terminus. In preferred design, the single-crystal tungsten rod is placed in a gaseous medium that consists of oxygen and a non-oxygen gas. The molar ratio between oxygen and the non-oxygen gas is greater than 1:1.
Abstract:
There is provided an iridium tip including a pyramid structure having one {100} crystal plane as one of a plurality of pyramid surfaces in a sharpened apex portion of a single crystal with orientation. The iridium tip is applied to a gas field ion source or an electron source. The gas field ion source and/or the electron source is applied to a focused ion beam apparatus, an electron microscope, an electron beam applied analysis apparatus, an ion-electron multi-beam apparatus, a scanning probe microscope or a mask repair apparatus.
Abstract:
Optimization techniques are disclosed for producing sharp and stable tips/nanotips relying on liquid Taylor cones created from electrically conductive materials with high melting points. A wire substrate of such a material with a preform end in the shape of a regular or concave cone, is first melted with a focused laser beam. Under the influence of a high positive potential, a Taylor cone in a liquid/molten state is formed at that end. The cone is then quenched upon cessation of the laser power, thus freezing the Taylor cone. The tip of the frozen Taylor cone is reheated by the laser to allow its precise localized melting and shaping. Tips thus obtained yield desirable end-forms suitable as electron field emission sources for a variety of applications. In-situ regeneration of the tip is readily accomplished. These tips can also be employed as regenerable bright ion sources using field ionization/desorption of introduced chemical species.
Abstract:
An integrated vacuum microelectronic structure is described as having a highly doped semiconductor substrate, a first insulating layer placed above said doped semiconductor substrate, a first conductive layer placed above said first insulating layer, a second insulating layer placed above said first conductive layer, a vacuum trench formed within said first and second insulating layers and extending to the highly doped semiconductor substrate, a second conductive layer placed above said vacuum trench and acting as a cathode, a third metal layer placed under said highly doped semiconductor substrate and acting as an anode, said second conductive layer is placed adjacent to the upper edge of said vacuum trench, the first conductive layer is separated from said vacuum trench by portions of said second insulating layer and is in electrical contact with said second conductive layer.
Abstract:
A cold cathode field emission electron source capable of emission at levels comparable to thermal sources is described. Emission in excess of 6 A/cm2 at 7.5 V/μm is demonstrated in a macroscopic emitter array. The emitter has a monolithic and rigid porous semiconductor nanostructure with uniformly distributed emission sites, and is fabricated through a room temperature process which allows for control of emission properties. These electron sources can be used in a wide range of applications, including microwave electronics and x-ray imaging for medicine and security.
Abstract translation:描述了能够以与热源相当的水平发射的冷阴极场致发射电子源。 在宏观发射极阵列中证明了在7.5V /μm下超过6A / cm 2的发射。 发射器具有均匀分布的发射位点的单片和刚性多孔半导体纳米结构,并且通过允许控制发射特性的室温工艺制造。 这些电子源可用于广泛的应用,包括微波电子学和医学和安全性的x射线成像。
Abstract:
In an illustrative embodiment, a three electrode circuit element comprises an insulating material, a cavity in the insulating material, first and second electrodes spaced apart in the cavity by a distance small enough that electron emission is caused when suitable operating voltages are applied to the first and second electrodes, and a gate electrode near one of the first and second electrodes. A voltage applied to the gate electrode can control current flow between the first and second electrodes. The circuit element may be realized in a planar structure in which the electrodes are formed in substantially the same plane; or it may be a multi-layer device in which some or all of the electrodes are in separate layers of conductive material. Methods for forming the circuit element are also disclosed. Illustrative applications of the three electrode circuit element to provide standard circuit functions are also disclosed.
Abstract:
A field-emission electron gun including an electron emission tip, an extractor anode, and a mechanism creating an electric-potential difference between the emission tip and the extractor anode. The emission tip includes a metal tip and an end cone produced by chemical vapor deposition on a nanofilament, the cone being aligned and welded onto the metal tip. The electron gun can be used for a transmission electron microscope.
Abstract:
A carbon nanotube field emission device with overhanging gate fabricated by a double silicon-on-insulator process. Other embodiments are described and claimed.
Abstract:
The present invention relates to a method for manufacturing a plurality of nanostructures comprising the steps of providing a plurality of protruding base structures (104) arranged on a surface of a first substrate (102), providing a seed layer mixture, comprising a solvent/dispersant and a seed material, in contact with the protruding base structures, providing a second substrate arranged in parallel with the first substrate adjacent to the protruding base structures, thereby enclosing a majority of the seed layer mixture between the first and second substrates, evaporating the solvent, thereby forming a seed layer (110) comprising the seed material on the protruding base structures, removing the second substrate, providing a growth mixture, comprising a growth agent, in contact with the seed layer, and controlling the temperature of the growth mixture so that nanostructures (114) are formed on the seed layer via chemical reaction in presence of the growth agent.