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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/11570

Title: Capacitive field-effect (bio-)chemical sensors based on nanocrystalline diamond films
Authors: Bäcker, Matthias
Poghossian, Arshak
Abouzar, Maryam H.
WENMACKERS, Sylvia
JANSSENS, Stoffel
HAENEN, Ken
WAGNER, Patrick
Schöning, M.J.
Issue Date: 2010
Publisher: MATERIALS RESEARCH SOCIETY
Citation: Bergonzo, Philippe & Butler, James E. & Jackman, Richard B. & Loh, Kian Ping & Nesládek, Milos (Ed.) DIAMOND ELECTRONICS - FUNDAMENTALS TO APPLICATIONS III. p. 173-178.
Series/Report: MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS, 1203
Abstract: Capacitive field-effect electrolyte-diamond-insulator-semiconductor (EDIS) structures with Oterminated 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.
URI: http://hdl.handle.net/1942/11570
DOI: 10.1557/PROC-1203-J17-31
ISBN: 978-1-60511-176-6
ISSN: 0272-9172
Category: C1
Type: Proceedings Paper
Appears in Collections: Research publications

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