Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Nanostructures at surfaces: Wires, tubes
O 52.9: Vortrag
Mittwoch, 16. März 2011, 17:00–17:15, WIL B122
Synthesis, characterization and gas sensing applications of CuO nanowires — •Stephan Steinhauer1, Elise Brunet1, Christian Griessler1, Marcus Milnera1, Giorgio Mutinati1, Anton Köck1, Christian Edtmaier2, Wolf-Dieter Schubert2, Christian Gspan3, and Gerald Kothleitner3 — 1Health & Environment Department, Nano Systems, AIT Austrian Institute of Technology GmbH, Vienna, Austria — 2Institute of Chemical Technologies and Analytics, Vienna University of Technology, Vienna, Austria — 3Institute for Electron Microscopy and Fine Structure Research, Graz University of Technology, and Centre for Electron Microscopy Graz, Graz, Austria
A powerful strategy to improve sensor performance of metal oxide based gas sensors is the implementation of single-crystalline nanowires as sensing elements due to the high surface to volume ratio. Thermal oxidation is a convenient solution for growth of single-crystalline cupric oxide (CuO) nanowires with high aspect ratios. SEM and TEM analysis showed different growth characteristics when varying the oxidation temperature, the oxygen concentration, the relative humidity and the substrate. Single-crystalline CuO nanowires with lengths between 0.5 micrometer and 40 micrometer and diameters from 20 nanometer to 120 nanometer have been fabricated. In particular, high-aspect ratio CuO nanowires have been employed as gas sensing elements and their sensitivity to carbon monoxide and hydrogen sulfide has been successfully demonstrated. For hydrogen sulfide, the nanowire gas sensor is even able to detect a concentration as low as 1 ppm.