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The effects of ion bombardment on the field emission of screen printed tetrapod zinc oxide cathodes are reported. The field emission characteristics of this cathode degrade strongly after Ar ion bombardment for 10 min at an energy of 3 keV and ion current of 5 muA. The emission current density decreases from 1.65 to 0.32 mA/cm2 at 4.50 V/mum field strength, while the turn-on field increases from 2...
Evaporation of carbon nanotubes (CNT) cathodes and the degradation of its field emission are reported in this paper. After 100 h at 1323 K the emission current density decreases from 6.50 to 0.20 mA/cm2 at 7.50 V/mum field strength, while the turn-on field increases from 1.92 to 2.45 V/mum at a current density of 0.1 muA/cm2. The C+-ion current in a mass spectrometer has also been measured to compare...
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