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.Needs:
Implementation:
Using the effect of cathode field emission of carbon nanotubes is one of the promising directions for these technologies.
Investigations:
The mechanism of field emission, VAC peculiarity, relationship with the CNTstructure, field cathode structure, the use of systems with CNT to create electronic devices.
Applications:
Material | The threshold field (V / m) |
Mo | 50–100 |
Si | 50–100 |
The semiconductive p-type diamond | 130 |
Undoped defective CVD diamond | 30–120 |
Amorphous diamond | 20–40 |
Cs coated diamond | 20–30 |
Graphite powder (<1 mm in size) | 17 |
Nanostructured diamond | 3-5 (unstable> 30 mA/cm2) |
CNT | 1-3 (stable at 1A/cm2) |