Effect of vacuum level on field emission from nanographite films
- 79 Downloads
The effect of vacuum level on field emission from nanographite films obtained by plasma-chemical deposition is studied. The stable emission of electrons from the nanographite is observed at a threshold field of 1–2 V/μm, a current density of 0.1 mA/cm2, and a residual gas pressure in the measuring chamber of less than 10−5 Torr. At a higher pressure, the emission properties of the films gradually degrade with time. Repeat evacuation of the chamber to 10−5 Torr restores the emission properties. Such behavior of the nanographite emitters is explained by adsorption/desorption processes (reversible degradation of the emission) and the destruction of the film under the action of residual gas ion bombardment (irreversible changes).
KeywordsField Emission Vacuum Level Field Emission Property Interelectrode Spacing Field Emission Current
Unable to display preview. Download preview PDF.