Field-emission device

Field emission displays are VFDs that use field emission cathodes as the electron source. The cathodes can be molybdenum microtips,33-35 carbon films,36,37 carbon nanotubes,38" 16 diamond tips,47 or other nanoscale-emitting materials.48 Niobium silicide applied as a protective layer on silicon tip field emission arrays has been claimed to improve the emission efficiency and stability.49 ZnO Zn is used in monochrome field emission device (FED) displays but its disadvantage is that it saturates at over 200 V.29... 

Field emission devices, 17 49-50 Field emission FPDs (FEDs), 22 259 Field emission microscope (FEM), 16 503 Field emission microscopy (FEM), 24 74 Field emission scanning electron microscope (FESEM), 16 492 Field emission scanning electron... 

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It is well known that nanotubes and nanowires with sharp tips are promising materials for application as cold cathode field emission devices. We have investigated the field emission of different nanowire structures. The first is from SiNWS. SiNWs exhibit well-behaved and robust field emission fitting a Fowler-Nordheim (FN) plot. The turn-on field for SiNWs, which is needed to achieve a current density of 0.01 mA cm , was 15 V p.m [26]. The field emission characteristics may be improved by further optimization, such as oriented growth or reducing the oxide shell, and may be promising for applications. 

Contrary to other field emission displays that consist of arrays of tips generated by mechanical means, carbon nanotubes are stable up to much higher field intensities, while they emit already at a rather low field of <1V(xm . They can also stand high current densities of more than 1 Acm"l Both SWNTs and MWNTs are suitable for the production of field emission devices. The actual absence of defects is a more decisive parameter here. It correlates well with the efficiency of emission. MWNTs are more robust on long-term use, whereas for SWNTs, the small diameter of individual tubes is an attractive feature. 

Engineered carbon nanotube field emission devices... 

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