Vortrag: Chemical and Biological Sensing on modified metallic and semiconducting interfaces

Vortrag im Fakultätskolloquium am 23.5.2007

Im Rahmen des Fakultätskolloquiums findet
am Mittwoch, dem 23.5.2007, um 16 Uhr s.t., im Kleinen Horst-Luther-Hörsaal, Leibnizstrasse 8,
folgender Gastvortrag statt:

Chemical and Biological Sensing on modified metallic and semiconducting interfaces
Prof. Dr. Sabine Szunerits, INPG LEMI-ENSEEG, Saint Martin d’Herès, France

Chemical and biological sensors have emerged as interesting means since the 1980s to detect and measure parameter such as electrical charge, light intensity, current densities, refractive indexes, etc. If these detected physical parameters include quantitative as well as qualitative information, they can be used as underlying principles for sensors. In this respect are chemical and biological sensors nothing else then complex extensions of physical sensors. As a consequence, the transducer technologies developed for physical sensors can be used as the bases of such sensing devices.
One of the requirements for sensitive and real time sensing is the covalent linking of sensing molecules or layers onto the chosen transducer. In this presentation different approaches for the modification of metallic and semi-conducting interfaces such as gold, boron doped diamond, indium tin oxide and silica will be presented and discussed. I will focus mainly on electrochemical and optical detection schemes as these are employed individually as well as in combination in our research group. The electrochemical techniques presented include electrochemical impedance spectroscopy (EIS), cyclic voltammetry, as well as Scanning Electrochemical Microscope (SECM). The optical detection schemes used on the different interfaces for chemical and biological sensing are surface plasmon resonance (SPR), fluorescence imaging and electrochemical Scanning Near-field Optical Microscope (E-SNOM). Different examples including the detection of oxygen, the interaction of oligonucleotides as well as the sensing of heavy metals will be presented.

From: 08.05.2007 14:38


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