We introduce a novel scanning projection field emission microscope (SPFEM) designed to study flat broad-area field emission cathodes. The instrument merges capabilities of measuring the field electron emission (FE) current from an individual emitting site and genuine projection of electrons onto a luminescent screen. The unique SPFEM performance is demonstrated on smooth sulfur doped nanodiamond films synthesized on molybdenum substrates
COBISS.SI-ID: 21311527
Vertically aligned bundles of molybdenum–sulfur–iodine nanowires MoSIx were grown on a molybdenum foil, thin wire, and quartz substrate. By choosing different growth parameters we have been able to vary the surface density in a wide range. A good electrical contact exists between the bundles and substrate. The nanowires are found to have excellent field emission properties, competitive with state-of-the-art carbon nanotube large-area field emitters.
COBISS.SI-ID: 21310247
We report the initial conditioning procedure and achieved properties of nanowires composed of molybdenum sulfur iodine and directly grown on molybdenum wire. Such a wire was applied as a radial field emitter with a 20 mm2 geometric area. A stable current density of ~2 mA/cm2 was achieved. The most unexpected result was a reversible field emission current dependence induced by varying the deuterium pressure within the range from 10-8 to 10-4 mbar. The maximum increase for a factor of 7 was registered. Possible mechanisms responsible for the observed phenomena are discussed.
COBISS.SI-ID: 21705511
The field-emission and current-voltage characteristics of individual W5O14 nanowires were studied using a transmission electron microscope and a field-emission microscope. The individual W5O14 nanowires made good ohmic contacts with W and Pt. The field-emission measurements showed that a current as high as 35 µA can be extracted from a single nanowire. A reduced angular current density of 28.7 nAsr-1V-1. These results suggest that W5O14 nanowires might be a realistic candidate as the source for a low-energy electron beam.
COBISS.SI-ID: 21580327