Regensburg 2007 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Vacuumnanoelectronics: fabrication, properties and applications

VA 3.4: Talk

Monday, March 26, 2007, 15:30–15:50, H9

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, University of Wuppertal, D-42097 Wuppertal — ²Department of Material and Earth Sciences, Darmstadt University of Technology, D-64287 Darmstadt — ³Gesellschaft für Schwerionenforschung (GSI), D-64291 Darmstadt

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 10⁵ 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.