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We have observed much variety of field emission microscopy (FEM) patterns from C60 molecules, including patterns that are much larger than the geometrical shape of C60 and very similar to those of simple atomic orbitals. It has been reported that C60 possesses unoccupied super atomic molecular orbitals (SAMOs) on the basis of theoretical investigations and experimental observations by means of scanning...
A new way to improve the current stability of an in-plane gated CNT emitters cathode with a closed loop control has been investigated. Ageing has been performed with a variation of external conditions by introducing hydrogen into the vacuum chamber and resulting in a low impact on the stability due to the feedbacked adjustment of the local electric field at the apex of CNTs given by the closed loop...
Silicon carbide field emission arrays coated with two different type of nanocrystalline diamond thin film: undoped and highly boron-doped are compared. The last one shows two times lower electric field threshold for electron emission.
Field emission of high current from carbon nanotube (CNT) emitters usually enforces them to be exposed to high electric fields (electrostatic forces) and Joule heating. In addition, vacuum packaging of field emitter devices are often carried out at high temperature. Under such circumstances, CNT emitters may be easily damaged, thus requiring highly crystalline and thermally stable CNTs. This study...
We reported fabrication and field emission properties of carbon nanotube (CNT) field emitters which indicated the point-type CNT film emitter and line-type CNT film emitter. The CNT film field emitters were made by cutting CNT film using a razor. The CNT film emitters showed good emission properties such as the low turn-on field, the high emission current in a triode configuration. Especially, the...
When (on average) an electron is field emitted from above the Fermi level there is a cooling effect, called Henderson-cooling; when (on average) it is emitted from below the Fermi level then Nottingham-heating occurs. This work compares our earlier used simple estimation to predict this emitted electron energy difference (average energy of emitted electron minus the Fermi level in the cathode) during...
Recently, we presented a multiscale model of field emission (FE) from carbon nanotube fibers (CBFs) taking into account Joule heating within the fiber and radiative cooling and the Nottingham effect at the tip of the individual carbon nanotubes in the array located at the fiber tip [1]. The model was used to predicts the fraction of carbon nanotubes (CNTs) being destroyed as a function of the applied...
This paper presents the electric field distribution and current emission in a vacuum nano-diode. The electric field is calculated exactly inside a finite vacuum cathode-anode (A-K) gap with a single trapezoid protrusion on one of the electrode surface. It is found there is strong field enhancement on both electrodes near the protrusion, when the ratio of the A-K gap distance to the protrusion height...
Pulse field emission characteristics of a single carbon nanotube (CNT) were investigated using an in-situ scanning electron microscope combined field emission measurement system. The critical field emission current density was related to the length of CNT. Given a certain pulse period, CNT which is shorter in length, could bear higher electric field strength and achieve higher current density.
A gridded micro-focus X-ray electron gun based on carbon nanotube cathode has the advantages of small volume, clear imaging and high temporal resolution compared with the conventional X-ray source. An array of CNT bundle is simulated to reduce the electric field screening effects for achieving stable large current density. The gridded electron gun based on carbon nanotube cathode is simulated by three-dimensional...
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