We using emission cathodes based on oriented carbon nanotubes. In use oriented carbon nanotubes in X-ray Tubes we can get localization of radiation. Emission threshold field for our material based on CNTs is 1-3 V / m, the emission current remains stable at current densities up to 1 A/cm ^2.Carbon nanotubes (CNTs) are ideal electron field emitters due to their high aspect ratio, superior electrical and thermal conductivity, and relatively high chemical and mechanical stability.
Using the effect of cathode field emission of carbon nanotubes is one of the promising directions for these technologies.
The mechanism of field emission, VAC peculiarity, relationship with the CNTstructure, field cathode structure, the use of systems with CNT to create electronic devices.
The threshold field (V / m)
The semiconductive p-type diamond
Undoped defective CVD diamond
Cs coated diamond
Graphite powder (<1 mm in size)
3-5 (unstable> 30 mA/cm2)
1-3 (stable at 1A/cm2)