Regensburg 2007 – wissenschaftliches Programm
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 3: Vacuumnanoelectronics: fabrication, properties and applications
VA 3.3: Vortrag
Montag, 26. März 2007, 15:10–15:30, H9
Thermal instability of gold nanowires — •Shafqat Karim1, Maria Eugenia Toimil-Molares2, Adam Balogh3, Wolfgang Ensinger3, Thomas Cornelius2, and Reinhard Neumann2 — 1Fachbereich Chemie, Marburg University, 35032 Marburg — 2Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt — 3Institute of Materials Science, Darmstadt University of Technology, 64287 Darmstadt
The technological implementation of nanostructures in future nano- and opto-electronic devices requires the capability to withstand elevated temperatures often encountered during routine operation. However, due to their reduced size and high surface to volume ratio, nanowires are expected to display structural and morphological instabilities. The Rayleigh instability concept, introduced to describe the instability of liquid jets, is applied to the fragmentation of metal nanowires during heating [1, 2].
Gold nanowires are electrochemically deposited in etched ion track membranes [3]. After dissolving the template, the wires are put on a substrate and heated to temperatures between 300 and 600 °C. The wires decay driven by Rayleigh instability, and the process depends on annealing temperature, wire diameter, and crystallinity. Wires of diameter 20 nm already fragment at 300 °C being far below the bulk melting temperature of 1064 °C.
[1] M.E. Toimil Molares et al. Appl. Phys. Lett. 85 (2004) 5337, [2] S. Karim et al. Nanotechnology 17 (2006) 5954, [3] S. Karim et al. Appl. Phys. A 84 (2006) 403