It is shown that by fine-tuning the fabrication parameters, these webs can achieve an optimum density of individual emission sites Double-layered electrodes made by deposition of two layers of these webs with perpendicular alignment towards each other are shown to be able to lower the turn-on electric field ( electric field required for achieving an emission current of 10 ?A / cm 2 ) down to 0.3 V / ?m and provide a stable field emission performance.
