Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques

MO 14.19: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Unique inherent property of seawater promotes the SERS detection in femtomolar range — Rahsha Hassanein, •Patrice Donfack, Bernd von der Kammer, and Arnulf Materny — Physics and Earth Sciences, Jacobs University Bremen, Campus Ring 1, 28759 Bremen

Surface-enhanced Raman spectroscopy (SERS) has been used extensively in order to overcome the inherent weakness of the Raman signal when detecting substances at very low concentrations. Underwater sensing is becoming an emerging and yet rather challenging field. Since often only traces of substances have to be detected, SERS is the only way to obtain vibrational data. Complex SERS substrates have been tested for this application. In this contribution, we will demonstrate that colloidal SERS substrates in solution when added to sea water yields extremely high enhancement factors. Using such a straightforward approach leads to the enhancement of the Raman signal of crystal violet in sea water, which enabled us to detect concentrations as low as femtomolar.