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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.82: Poster
Wednesday, March 16, 2011, 17:30–21:00, P4
Fabrication and application of core-shell nanorod structures — •Vera Hoffmann1, René Kullock1, Mathias Böhm1, Gunther Scheunert2, and Lukas M. Eng1 — 1Institut für Angewandte Physik/Photophysik, TU Dresden, Dresden, Germany — 2Department of Physics and Astronomy, Queen’s University Belfast, Belfast, UK
The fabrication of nanorod arrays made of a single material such as gold, silver, cobalt and others is already an established technique. However, nanorods made of material combinations have hardly been exploited so far, and may lead to novel physical properties of the array. In this study, we present how gold-nickel core-shell nanorod structures are fabricated: An anodised aluminium oxide matrix containing gold nanorods is partly etched to obtain an air shell around the gold rods. Then the resulting gaps are filled with nickel in a subsequent electrodeposition step .
Nanorod arrays can be used for various sensor applications. For example, the interrod distance and the angle of incidence strongly influence the collective surface plasmon resonance (CSP) of the structure [1,2]. Thus, if the structure is prepared on a transparent flexible substrate, application of external mechanical stress affects the optical properties of the device, which can be used to detect strain on a local scale. Furthermore, the magnetic properties of nickel-gold nanorod arrays can be exploited for magnetic sensors with optical read-out.
[1] R. Kullock et al., Optics Express 16, 21671 (2008) [2] R. Kullock et al., J. Opt. Soc. Am. B 27, 1819 (2010)