Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.31: Poster
Tuesday, April 1, 2014, 18:30–22:00, P2
Hydrogen-sensing with complex arrow-headed Au/Pd nanorods — •Domenico Paone1, Xingchen Ye2, Nikolai Strohfeldt1, Andreas Tittl1, Chris Murray2, and Harald Giessen1 — 14th Physics Institute and Research Center SCOPE, University of Stuttgart — 2Department of Materials Science and Engineering, and Department of Chemistry, University of Pennsylvania
Sensitive and reliable hydrogen detection is a key safety requirement for industrial process monitoring and catalysis. Hybrid plasmonic nanoparticles combine highly-resonant noble metal nanoparticles with chemically sensitive materials to detect a variety of gases. Furthermore, chemically synthesized nanoparticles can be grown with high yield and thus at low cost. Here, we demonstrate hydrogen-sensing with arrow-headed Au nanorods that are covered with a small amount of palladium (Pd). The arrow-headed shape was chosen to maximize the plasmonic field enhancement at the tips of the gold nanorods, allowing them to detect very small hydrogen-induced changes in the adjacent Pd. We perform dark-field scattering measurements on single nanorods while exposing the sample to different concentrations of hydrogen in nitrogen carrier gas and find pronounced spectral shifts. In addition, we investigate nanorods with a variety of geometrical parameters and correlate them with the sensing performance. In future, our nanosensor platform will enable single particle sensing and spectroscopy of a variety of gases down to very low concentrations.