Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 28: Thin Film Applications

DS 28.5: Talk

Wednesday, March 9, 2016, 11:00–11:15, H8

Gradient gold island films for the optimization and quantification of surface enhanced infrared absorption — •Christoph Kratz, Tom Oates, and Karsten Hinrichs — Leibniz-Institut für Analytische Wissenschaften -ISAS- e.V., Berlin, Deutschland

Surface enhanced infrared absorption (SEIRA) has gained large interest for biosensor applications. SEIRA enables to boost sensitivity of the label free and non-destructive technique of IR-spectroscopy for studying ultrathin films by a factor of about 10-100. In conjunction with optical modeling and simulations IR spectroscopy allows for the interpretation of molecule specific vibrational bands to determine chemical and structural changes as well as the adsorbed/desorbed amount of molecules and proteins. Application of enhancement substrates with a thickness gradient allows studying the influence of thickness effects on the enhancement on a single substrate. These effects have been studied with a model system of a self-assembled monolayer of 4-mercaptobenzonitrile. Structural and optical properties of the bare and modified enhancement substrate were determined by various methods. The investigations show that an a priori indication of the enhancement can be obtained by the observation of a band related to the native oxide below the island film.