American Institute of Physics, Journal of Vacuum Science and Technology B, 2(25), p. 586
DOI: 10.1116/1.2709888
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The authors have measured the field emission properties of freestanding bare and Au-coated Ni nanowires randomly distributed on thin metallic substrates. The nanowires of uniform length and diameter were grown in the etched ion-tracked pores of polycarbonate membranes by electrochemical deposition. While bare Ni samples yielded only 1.6×104 emitters / cm 2 at 10 V /μ m , Au coating of the Ni nanowires improved the emission site density to 1.4×105/ cm 2 at 5 V /μ m and about 1.6×106 emitters / cm 2 at 18 V /μ m . Average field enhancement factors β of 331 for bare Ni and 302 for Au-coated Ni nanowires correspond well to their cylindrical shape in the scanning electron microscope images. Stable Fowler-Nordheim-like emission was obtained on average up to currents of about 0.4 and 8 μ A for bare and Au-coated Ni nanowires, respectively. Locally measured I-V curves, maximum current I max , and derived β values hint for the clustering of nanowires.