Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 6: Thin Film Applications

DS 6.2: Talk

Monday, March 12, 2018, 15:15–15:30, H 0111

Metal thin films as plasmonic support for surface enhanced vibrational spectroscopy and optofluidics — •Dimitra Gkogkou, Christoph Kratz, Norbert Esser, Eugen Speiser, and Karsten Hinrichs — Leibniz-Institut für Analytische Wissenschaften -ISAS- e.V., Department Berlin, Schwarzschildstr. 8, 12489 Berlin, Germany

We present metal nanoisland films that exhibit plasmonic resonances in the visible and infrared region of the spectrum. These different resonances correspond to adjacent areas of an Au gradient layer and provide surface enhanced Raman scattering (SERS) and surface enhance infrared absorption (SEIRA) signals, dependable on the thickness of the layer. In that way, all vibrational information of an adsorbed molecule can be acquired by a line scan on a single substrate. Also presented is the integration of this combinatorial substrate with a microfluidic setup that allows for the in-situ investigation of μL volumes. Ultra low detection limits of analytes were achieved, i.e. submonolayer sensitivity demonstrated in situ for monolayer self-assembly.

The presented optofluidic platform is a sensing device that has possible applications in sensitive and label-free biosensing, lab-on-a-chip devices, or molecular imaging tools for biochemical analyses.