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MM: Fachverband Metall- und Materialphysik
MM 23: Nano structured materials I
MM 23.6: Vortrag
Mittwoch, 28. März 2007, 16:00–16:15, H4
Field emission properties of bare and gold coated metallic nanowires grown in polymer ion-track membranes — •Arti Dangwal1, Günter Müller1, Florian Maurer2, Joachim Brötz2, Hartmut Fuess2, and Christina Trautmann3 — 1FB C Physics Department, University of Wuppertal, D-42097 Wuppertal, Germany — 2epartment of Material and Earth Sciences, Darmstadt University of Technology, D-64287 Darmstadt, Germany — 3Gesellschaft für Schwerionenforschung (GSI), D-64291 Darmstadt, Germany
We have measured the field emission (FE) properties of randomly distributed free-standing bare and gold coated Cu and Ni nanowires grown electrochemically into the pores of etched ion-tracked polycarbonate membranes [1]. The emission site density and current distribution of nanowires were measured with the field emission scanning microscope. Onset fields of some V/µm for nA current were observed for all samples. In the best case, at 5 V/µm bundled Cu and Au-coated Ni nanowires yielded more than 10^5 emitters/cm2. Average field enhancement factors for all measured samples lie in the range 245-331, which correspond well to the field enhancement estimated from their cylindrical shape in SEM images [2]. Au-coated bundled Cu nanowires sample showed best results among all measured samples in terms of carrying high and stable FE currents, i.e. most of the emitting sites produced FE currents in 10 -35 µA range without destruction.
[1] F. Maurer et al., Nuclear Instruments Methods in Physics Research B 245, 337 (2006).
[2] A. Dangwal et al., subm. to JVST B.