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Field emission properties of bare and gold-coated nickel nanowires grown in polymer ion-track membranes

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5 Author(s)
Dangwal, A. ; FB C Physik, Bergische Universität Wuppertal, D-42097 Wuppertal, Germany ; Muller, G. ; Maurer, F. ; Brotz, J.
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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/cm2 at 10 Vm, Au coating of the Ni nanowires improved the emission site density to 1.4×105/cm2 at 5 Vm and about 1.6×106 emitters/cm2 at 18 Vm. 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 μA for bare and Au-coated Ni nanowires, respectively. Locally measured I-V curves, maximum current Imax, and derived β values hint for the clustering of nanowires.

Published in:

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures  (Volume:25 ,  Issue: 2 )

Date of Publication:

Mar 2007

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