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At present, many vacuum devices based on nanotechnology are widely used. The life time of the device depends mainly on the outgassing rate and the seal leak rate of the device. The leak rate is required to be less than 10−14Pam3/s in some application fields of long-life and high reliability devices. To solve this problem, the ultra-high vacuum leak detection apparatus with the lower limit of 10−16...
Needle-like single crystal diamond structures were obtained by combination of the plasma enhanced chemical vapor deposition (CVD) and selective oxidation techniques. Field emission currents and total electron energy distributions were measured for individual diamond needles as functions of extraction voltage and the intensity of the femtosecond laser focused on the needle. Moreover, a new set-up based...
The institute of aerospace engineering at TU Dresden is developing a highly miniaturized field emission electric propulsion (FEEP) system for Nano-satellites, called CubeSats. The presented propulsion system NanoFEEP is composed of the actual field emission thrusters and a carbon nanotubes silicon chip used as a cold electron source for neutralizing the electric charging behavior of the spacecraft...
An in-situ fabrication technique based on ion track etched template electrodeposition of metallic nanocones was used for the production of field emitter cathodes. Gold nanocones with a height of 24 microns, a base diameter between 3 to 4 microns and a tip diameter below 300 nanometers were deposited on a circular electrode with a diameter of 2.5 mm. The integral field emission (FE) measurements of...
An array of conical-shaped p-type silicon tips was fabricated by using reactive ion etching and sharpening oxidation. The apex of each tip was decorated by a tungsten hemispherical nanoparticle. Field emission properties of the tips were measured by a tungsten-needle anode positioned above the tip apex. Tips decorated with tungsten nanoparticles demonstrated a smaller saturation region in current-voltage...
Magnification of an electrostatic divergent lens with extremely short gap spacing was investigated with computer simulation. The present study focused on the dependence of the magnification on the electrode spacing. The numerical solution showed a relatively good agreement with the analytical value when the ratio of the aperture diameter to the electrode spacing was less than unity. The magnification...
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