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Planar field electron emitters containing carbon nanotubes that demonstrate stable emission currents with densities about 1A/cm 2 have been fabricated using the chemical vapor deposition method. The analysis of field emission characteristics based on Fowler–Nordheim theory allowed one to calculate not only the field amplification coefficient β, but also the total emission area A of all the...
Field emitters on the base of carbon nanotubes can be used in various electron vacuum devices. We describe the construction and parameters of a prototype of an X-ray tube with the carbon nanotube field emitter. The X-ray tube is a glass device 40 mm long and 16 mm in diameter
The influence of applied electric field (E av ) and emission current (I FE ) on the configuration of conical layers carbon nanotubes (CLNTs) grown by CVD on the edge of Ni foil has been investigated. TEM profile imaging revealed a high concentration of nanotubes near the foil edge surface, whereas on the nanotube layers’ outer surfaces single, non-oriented nanotubes with open ends...
Carbon nanotube (NT) layers grown by CVD on Ni foil demonstrated low voltage characteristics of field electron emission: the value of the field amplification coefficient beta was in the range 1000-4000. The influence of electric field (Eav), emission current (IFE ) and exposure time on the configuration of conical-layer carbon nanotubes grown by CVD on the edge of a Ni foil has been investigated....
We present the field emission characteristics of nanotube carbon layers grown by chemical vapor deposition process. In this process, products of thermal decomposition of polyethylene were used as the source of carbon. SEM and HREM investigations of manufactured layers showed that these layers consisted of randomly oriented conical layer carbon nanotubes (CLNTs). The diameter of nanotubes usually ranged...
Layers (~ 1 μm thick) of crooked carbon nanotubes 20–60 nm in diameter were obtained at 800 °C by pyrolysis of polyethylene in He atmosphere using a Ni plate as a catalytic substrate. They were identified by electron microscopy and electron diffraction. Tips of some tubes (~ 10 6 /cm 2 ) come out of the layer. We studied their field electron emission at 10 −9 torr vacuum. 1–10...
The investigation results for the emission characteristics of thin films composed of nanotube carbon structures are described. These films are shown to provide high field electron emission and substantial thermal electron emission even at low temperatures. They exhibit low electron work functions and ensure stable field emission under conditions of operating vacuum.
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