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Here we propose a model to simulate the influence of atomistic properties of field emitters on the field emission current. As an example, we modeled the field emission from a zigzag-single walled carbon nanotube. By a modification in the self-energy in non-equilibrium Green's function formalism, we simulated the field emission current, considering quantum transport of electrons within the carbon nanotube...
We propose a fabrication method of gold nano-pillar structures with the aspect ratio up to ∼38. The optical electric field enhancement of density and height controlled gold nano-pillar arrays were experimentally studied by ultrafast near infrared photoemission. Strongly polarization dependent multi-photon photoemission was observed and compared with numerical simulation. The results show that such...
Compact field emission (FE) scanning electron microscope (SEM) equipped with a multiwall carbon nanotube (MWCNT) emitter has been experimentally manufactured. An electrostatic extraction and focusing lens designated to the CNT field emitter was designed. Electron emission from a MWCNT was stable under a vacuum of 10−7 Pa even without a stabilization resistance. The maximum acceleration voltage was...
In carbon nanotube (CNT) arrays, unequal current contribution from each emitter to the overall emission current would lead to non-uniform field emission (FE) performance and emitter failure. Therefore, we propose a novel field emission microscopy (FEM) method that allows us to visualize and record the FE performance of each emitter in free standing CNT arrays. In this study, this method successfully...
Most of applications based on cold cathode work in pulse driving mode. It is reported here that the field electron emission characteristics from carbon nanotube cold cathode by driving millisecond width pulse voltage is investigated. A peak emission current of 5.06 mA with the current density of 253 mA/cm2 is obtained from 0.02 cm2 carbon nanotubes film by driving 1 ms width with 10 Hz frequency pulse...
We demonstrate in this study the possibility to use nanodiamonds particles as hard mask to easily produce catalyst (Nickel) nanoparticles on-wafer with size in the 10–20nm range. These nanoparticles are used to grow vertically aligned carbon nanotubes (VACNTs) by employing a plasma enhanced chemical vapor deposition technic. These narrow VACNTs are grown to produce cold cathodes that will help to...
Field emission modulation has been demonstrated with an in-plane gated cathode based on carbon nanotubes, through scanning anode field emission microscopy. A low bias voltage enables a large current ratio of 106. These experimental results confirm model predictions and announce good promises for the future of this technology.
We developed the novel pseudo crystalline silicon (pc-Si) thin films with carbon nanotube electron beam exposure technique. CNT emitters grown by resist-assisted patterning process is used for the source of electron beam to crystallize an amorphous Si (a-Si:H) thin films. The high electron energy form CNT emitters is enough to change phase to pseudo crystalline due to the network vibration of silicon...
An 8mm traveling wave tube (TWT) based on carbon nanotube (CNT) cold cathode is theoretically researched to develop millimeter-wave vacuum electron radiation source devices based on CNT cold cathode in this paper. A gridded sheet-beam CNT electron gun and staggered double vane slow-wave structure (SWS) is adopted in the 8mm TWT based on a periodic permanent magnetic system. Simulation results show...
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