Abstract
The field emission (FE) properties of randomly distributed free-standing Cu and Ni nanowires on thin metallic substrates were measured. The wires were grown in the etched ion-tracked pores of polycarbonate membranes with various diameters of 120-330 nm, lengths of 8-18 mum and number densities of 106-108 emitters/cm2. The emission site density and current distribution of the nanowire cathodes were measured with the field emission scanning microscope (FESM) at about 10-7 Pa. All samples showed similar onset fields for 1 nA of some V/mum but rather different emission uniformity. At 5 V/mum the free standing Cu and Ni nanowires provided less than 4times104 emitters/cm2 , while the bundled Cu and Au-coated Ni nanowires yielded more than 105 emitters/cm2. For the latter sample about 1.6times106 emitters/cm2 were found at 18 V/mum, i.e. about than 10 % of the nanowires emitted
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