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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/11378

Title: Nanocrystalline-diamond thin films with high pH and penicillin sensitivity prepared on a capacitive Si-SiO2 structure
Authors: Poghossian, A.
Abouzar, Maryam H.
Razavi, A.
Baecker, M.
Bijnens, Nathalie
Williams, O. A.
Haenen, Ken
Moritz, W.
Wagner, Patrick
Schoening, M. J.
Issue Date: 2009
Citation: ELECTROCHIMICA ACTA, 54(25). p. 5981-5985
Abstract: A capacitive field-effect EDIS (electrolyte-diamond-insulator-semiconductor) sensor with improved pH and penicillin sensitivity has been realised using a nanocrystalline-diamond (NCD) film as sensitive gate material. The NCD growth process on SiO2 as well as an additional surface treatment in oxidising medium have been optimised to provide high pH-sensitive. non-porous O-terminated films without damage of the underlying SiO2 layer. The surface morphology of O-terminated NCD thin films and the layer structure of EDIS sensors have been studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods. To establish the relative coverage of the surface functional groups generated by the oxidation of NCD surfaces, X-ray photoelectron spectroscopy analysis was carried out. The hydrophilicity of NCD thin films has been studied by water contact-angle measurements. A nearly Nernstian pH sensitivity of 54-57 mV/pH has been observed for O-terminated NCD films treated in an oxidising boiling mixture for 80 min and in oxygen plasma. The high pH-sensitive properties of O-terminated NCD have been used to develop an EDIS-based penicillin biosensor. A freshly prepared penicillin biosensor possesses a high sensitivity of 85 mV/decade in the concentration range of 0.1-2.5 mM penicillin G. The lower detection limit is 5 mu M. (C) 2009 Elsevier Ltd. All rights reserved.
Notes: [Poghossian, A.; Abouzar, M. H.; Razavi, A.; Baecker, M.; Schoening, M. J.] Aachen Univ Appl Sci, INB, D-52428 Julich, Germany. [Poghossian, A.; Abouzar, M. H.; Razavi, A.; Baecker, M.; Schoening, M. J.] Forschungszentrum Julich, Res Ctr, Inst Bio & Nanosyst IBN 2, D-5170 Julich, Germany. [Bijnens, N.; Williams, O. A.; Haenen, K.; Wagner, P.] Hasselt Univ, Inst Mat Res, Diepenbeek, Belgium. [Williams, O. A.; Haenen, K.] IMEC VZW, Div IMOMEC, Diepenbeek, Belgium. [Moritz, W.] Humboldt Univ, Berlin, Germany. a.poghossian@fz-juelich.de
URI: http://hdl.handle.net/1942/11378
DOI: 10.1016/j.electacta.2009.03.011
ISI #: 000270347200005
ISSN: 0013-4686
Category: A1
Type: Journal Contribution
Validation: ecoom, 2010
Appears in Collections: Research publications

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