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O: Fachverband Oberflächenphysik

O 57: Plasmonics and Nanooptics II

O 57.8: Vortrag

Mittwoch, 2. April 2014, 17:45–18:00, GER 38

Hybrid plasmonic oligomer for large-area low-cost nano-size gas sensors — •Jun Zhao, Nikolai Strohfeldt, Andreas Tittl und Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany

Plasmonic gas sensing on the single nanoparticle level has drawn a lot of attention over the last years [1, 2]. We demonstrate direct contact gas sensing using hybrid complex plasmonic nanostructures, such as multilayer oligomers, where gold directly touches the palladium. Optimizing the sensing nanogeometry, we obtain spectral shifts of more than 10 nm depending on different H2 concentrations, which show a very high sensitivity of our system. We investigate the optical response of varied sandwich structure geometries, which can be used for different sensing applications. Our samples are fabricated by low-cost hole-mask colloidal nanolithography [3, 4] over areas of 1 cm2, and give very large absorption and scattering signals.

[1] N. Liu et al., Nature Mater. 2011, 10, 631. [2] A. Tittl et al., Nano Lett. 2013, 13, 1816. [3] S. Cataldo, J. Zhao et al., ACS Nano 2012, 6, 979. [4] J. Zhao et al., Adv. Mater. 2012, 24, 247.