Dresden 2009 – scientific programme

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DS: Fachverband Dünne Schichten

DS 26: Poster II

DS 26.18: Poster

Wednesday, March 25, 2009, 09:30–12:30, P5

Surface modification of Silicon-Based Light Emitters for smart Biosensing — •Charaf Cherkouk, Lars Rebohle, Wolfgang Skorupa, and Manfred Helm — Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden Rossendorf, POB 510119, D-01314, Germany.

A new concept for measuring the concentration of estrogen in drinking water by using Si-based integrated light sources for direct fluorescence analysis is presented.

One of the main steps for this sensor concept is the chemical modification of the chip surface. A novel Method to derivatize the surface of a silicon dioxide layer serving as a passivation layer for the sensor with N, N-Bis (3-aminopropyl)-2-butene-1, 4-diamine (APS), and N-(3-(Trimmethoxysilyl)-propyl)-diethyl (Det-APS) has been developed and optimized. This method uses a special chamber and is based on spin coating and spraying in nitrogen atmosphere. The electroluminescence measurements showed that there is no loss of transparency of the silicon dioxide layer due to the surface modification. The structure of the SiO₂ surface, the APS and the Det-APS layers was characterized by Infrared spectroscopy (FTIR) and X- ray photoelectron spectroscopy (XPS). Atomic force microscopy was used to investigate the roughness of the surface. The results give proof of a dense coverage with enough functional groups such as NH₂ for the adsorption of the estrogen receptor.