Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.17: Poster
Wednesday, March 24, 2010, 15:00–17:30, Poster A
Modification of Au and Si(111):H Surfaces towards Biological Sensing — •Xin Zhang1, Guoguang Sun2, Karsten Hinrichs2, Dana Rosu2, Norbert Esser2, Marc Hovestaedt3, Bernhard Ay3, Rudolf Volkmer3, Silvia Janietz4, and Jörg Rappich1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Si Photovoltaik, Berlin, Germany — 22 ISAS-Institute for Analytical Sciences, Department Berlin, Germany — 33 Institut für medizinische Immunologie, Charité Berlin, Berlin, Germany — 44 Fraunhofer-Institut für Angewandte Polymerforschung, Golm, Germany
Within the topics to grow functional organic surfaces for biosensors we grafted carboxylbenzene, aminobenzene and maleimidobenzene onto Au and H-terminated Si surfaces by electrochemical deposition from 4-carboxylbenzene-diazonium tetrafluoroborate (4-CBDT), 4-aminobenzene-diazonium tetrafluoroborate (4-ABDT) and 4-maleimidobenzene-diazonium tetrafluoroborate (4-MBDT).The electron injection to the diazonium compound in solution (cathodic current) leads to the formation of intermediate radicals, which further react with the surface (Au or Si:H) and the respective molecule is grafted onto the surface.The aim was to functionalise these surfaces for further reaction with corresponding amines, acids or cysteine-modified peptides. Ex-situ infrared spectroscopic ellipsometry (IRSE) was applied to inspect the surface species before and after the functionalisation.