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O: Fachverband Oberflächenphysik

O 90: Sensing, Active Structures and other Applications

O 90.9: Vortrag

Donnerstag, 19. März 2015, 17:00–17:15, MA 144

Plasmonic copper nanodisks for monitoring electrochemical redox-reactions — •Venla Manninen, Nikolai Strohfeldt, Florian Sterl, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, 70550 Stuttgart, Germany

Oxidation of copper under air-exposure has been studied well in colloidal films. As a noble metal, copper nanoparticles can produce strong localized surface plasmon resonances (LSPRs) when illuminated at the resonance frequency. Thus, a few reports have shown that the oxidation of copper nanoparticles can be monitored as changes in the spectral position and intensity of their LSPR.

Furthermore, electrochemical redox-reactions of copper in alkaline solutions have been studied in colloidal films. We therefore fabricated copper nanodisks with a very narrow homogeneous size distribution via colloidal hole-mask lithography on conductive substrates. The plasmonic behaviour of these structures was investigated via absorption and scattering spectroscopy in a bright field microscope. The changes in the LSPR of our copper nanodisks were monitored during their electrochemical oxidation and reduction reactions.

Since copper is widely used as catalyte in various chemical reactions, it is highly interesting to investigate the plasmonic response to (photo-)chemical reactions taking place on the surface of single particles, observable in dark-field microscopy. Potential applications of this principle include the plasmonic detection of electrochemically induced reactions on metal catalytes.