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Capacitive Field-effect (bio-)chemical Sensors Based on Nanocrystalline Diamond Films

Published online by Cambridge University Press:  31 January 2011

Matthias Bäcker ,
Arshak Poghossian ,
Maryam H. Abouzar ,
Sylvia Wenmackers ,
Stoffel D. Janssens ,
Ken Haenen ,
Patrick Wagner  and
Michael Josef Schöening
Matthias Bäcker
Affiliation:
Baecker@fh-aachen.de, Aachen University of Applied Sciences, Campus Jülich, Institute of Nano- and Biotechnologies, Juelich, Germany
Arshak Poghossian
Affiliation:
a.poghossian@fz-juelich.de, Aachen University of Applied Sciences, Campus Juelich, Institute of Nano- and Biotechnologies, Juelich, Germany
Maryam H. Abouzar
Affiliation:
abouzar@fz-juelich.de, Aachen University of Applied Sciences, Campus Jülich, Institute of Nano- and Biotechnologies, Juelich, Germany
Sylvia Wenmackers
Affiliation:
sylvia.wenmackers@uhasselt.be, Hasselt University, Institute of Materials Research, Diepenbeek, Belgium
Stoffel D. Janssens
Affiliation:
stoffel.janssens@uhasselt.be, Institute for Materials Research, Diepenbeek, Belgium
Ken Haenen
Affiliation:
ken.haenen@uhasselt.be, Institute for Materials Research, Diepenbeek, Belgium
Patrick Wagner
Affiliation:
Patrick.Wagner@uhasselt.be, Institute for Materials Research, Diepenbeek, Belgium
Michael Josef Schöening
Affiliation:
m.j.schoening@fz-juelich.de, Aachen University of Applied Sciences, Campus Jülich, Institute of Nano- and Biotechnologies, Juelich, Germany
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Abstract

Capacitive field-effect electrolyte-diamond-insulator-semiconductor (EDIS) structures with O-terminated nanocrystalline diamond (NCD) as sensitive gate material have been realized and investigated for the detection of pH, penicillin concentration, and layer-by-layer adsorption of polyelectrolytes. The surface oxidizing procedure of NCD thin films as well as the seeding and NCD growth process on a Si-SiO2 substrate have been improved to provide high pH-sensitive, non-porous thin films without damage of the underlying SiO2 layer and with a high coverage of O-terminated sites. The NCD surface topography, roughness, and coverage of the surface groups have been characterized by SEM, AFM and XPS methods. The EDIS sensors with O-terminated NCD film treated in oxidizing boiling mixture for 45 min show a pH sensitivity of about 50 mV/pH. The pH-sensitive properties of the NCD have been used to develop an EDIS-based penicillin biosensor with high sensitivity (65-70 mV/decade in the concentration range of 0.25-2.5 mM penicillin G) and low detection limit (5 μM). The results of label-free electrical detection of layer-by-layer adsorption of charged polyelectrolytes are presented, too.

Keywords

diamondsensorchemical vapor deposition (CVD) (deposition)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1203: Symposium J – Diamond Electronics and Bioelectronics-Fundamentals to Applications III , 2009 , 1203-J17-31
Copyright
Copyright © Materials Research Society 2010

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