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O: Fachverband Oberflächenphysik

O 76: Plasmonics and Nanooptics VII: Applications and Other Aspects

O 76.1: Vortrag

Mittwoch, 22. März 2017, 15:00–15:15, TRE Ma

Hydrogen Sensing using Chemically Grown Plasmonic Nanorods in a Dust-on-Film Geometry — •Domenico Paone¹, Martin Mayer², Nikolai Strohfeldt¹, Florian Sterl¹, Tobias König², and Harald Giessen¹ — ¹4th Physics Institute and Research Center SCoPE, University of Stuttgart — ²Institute of Physical Chemistry and Polymer Physics, Dresden

Noble metal nanostructures are able to confine electromagnetic radiation on a subwavelength nanometer scale. The resonant excitation of localized surface plasmons in such nanostructures gives rise to strong light absorption and scattering. These optical properties can be used in a rich variety of practical applications such as gas sensing. In this work, we present a dust-on-film sensing geometry by drop coating gold nanoparticles on active hydrogen absorbing films. The nanoparticles are fabricated by a seed-mediated growth method that enables the synthesis of nanorods with a wide variation of lengths. We employ these nanorods as optical antennas to investigate locally the hydrogen catalysis and absorption of palladium and magnesium films. To study our dust-on-film system, we perform single-particle dark-field spectroscopy on the individual gold nanorods. We are able to find pronounced spectral shifts upon exposure to different hydrogen concentrations, leading the way toward the development of inexpensive chemical reaction sensors with high sensitivity.