Carbon nanowalls in field emission cathodes

Carbon-nanotube-polymer nanocomposites for field-emission cathodes.

The electron field-emission (FE) characteristics of functionalized single-walled carbon-nanotube (CNT)-polymer composites produced by solution processing are reported. It is shown that excellent electron emission can be obtained by using as little as 0.7% volume fraction of nanotubes in the composite. Furthermore by tailoring the nanotube concentration and type of polymer, improvements in the c...

A Faceted Magnetron Concept Using Field Emission Cathodes

Generalized Mechanism of Field Emission from Nanostructured Semiconductor Film Cathodes

Considering the effect of both the buffer layer and substrate, a series of ultrathin multilayered structure cathodes (UTMC) is constructed to simulate the field emission (FE) process of nanostructured semiconductor film cathodes (NSFCs). We find a generalized FE mechanism of the NSFCs, in which there are three distinct FE modes with the change of the applied field. Our results clearly show sign...

Efficient field emission from structured gold nanowire cathodes

Based on last years field emission (FE) results achieved with randomly distributed free-standing gold nanowires (NW) [1], cathodes with regular arrays of Au-NW patches (50 μm diameter) were fabricated by means of a shadow mask during heavy ion irradiation of polycarbonate foils [2-3]. The number density, diameter Ø, and length L of the NW were controlled by the ion fluence f, foil etching time,...

Simulation of Field-emission Cathodes for High Current Electron Injectors

From the prospect of the high average current electron injectors, the most important advantage of the fieldemission cathodes is their capability to generate very large current densities. Simulation of field-emission cathodes is complicated by the large range of spatial dimensions: from sub-micron scale, for a single field-emission tip, to millimeter scale, for a field-emitter array. To overcome...