Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 10: Metal/Water Interfaces: Structure and Reactivity
O 10.2: Vortrag
Montag, 16. März 2015, 15:15–15:30, HE 101
On-line Detection of Different Concentrations of Organic Molecules Using a SERS Microfluidic Device — •Oana M. Buja1,2, Ovidiu D. Gordan1, Nicolae Leopold2, Andreas Morschhauser3, Jörg Nestler3, and Dietrich R.T. Zahn1 — 1Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — 2Faculty of Physics, Babes-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania — 3Fraunhofer Institute for Electronic Nano Systems, Technologie Campus 3, 09126 Chemnitz, Germany
In recent years the integration of microfluidic technology with powerful spectroscopic techniques such as surface-enhanced Raman scattering (SERS), has become important for analytical studies of hazardous chemicals. Here, we propose a SERS microfluidic device used for on-line detection and monitoring of different concentrations of two model organic molecules (caffeine and malachite green). The SERS active silver spot was synthesized on the bottom of the capillary when the laser beam (λ = 514.7 nm) was focused on a continuous flow of silver nitrate and sodium citrate1. Afterwards, different concentrations of selected analytes were injected and sequential SERS spectra were acquired. The adsorption of the molecules was investigated by monitoring the specific bands of caffeine (648 cm−1) and malachite green (1617 cm−1), respectively. By combining SERS and microfluidic technology a fast and reproducible on-line detection of organic molecules was achieved.
References: 1N. Leopold, B. Lendl, Anal. Bioanal. Chem., 2010, 396, 2341-2348.