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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/9102

Title: Sensing charged macromolecules with nanocrystalline diamond-based field-effect capacitive sensors
Authors: Poghossian, A.
Abouzar, Maryam H.
CHRISTIAENS, Pieter
WILLIAMS, Oliver
HAENEN, Ken
WAGNER, Patrick
Schöning, M.J.
Issue Date: 2008
Publisher: Allerton Press, Inc. distributed exclusively by Springer Science+Business Media LLC
Citation: Journal of Contemporary Physics (Armenian Academy of Sciences), 43(2). p. 77-81
Abstract: The possibility of a label-free electrical detection of layer-by-layer adsorbed polyelectrolyte (PE) multilayers using a field-effect capacitive electrolyte-diamond-insulator-semiconductor (EDIS) structure is investigated. Positively charged synthetic polyelectrolyte PAH (Poly (allylamine hydrochloride)) and negatively charged PSS (Poly (sodium 4-styrene sulfonate)) have been used as a model system. Nanocrystalline diamond films were grown on p-Si-SiO2 substrates by a microwave plasma-enhanced chemical vapor deposition from a mixture of methane and hydrogen. The EDIS sensors functionalized with charged macromolecules have been characterized by means of capacitance-voltage and constant-capacitance methods. Alternating shifts in the capacitance-voltage and constant-capacitance curves have been observed after the adsorption of each polyanion and polycation layer, respectively. The effect of the number of the adsorbed PE layers and polarity of the outermost layer on the sensor response is discussed.
Notes: Originally published in Russian in Investiya NAN Armenii, Fizika 43/2 (2008), 120-127.
URI: http://hdl.handle.net/1942/9102
DOI: 10.3103/S1068337208020060
ISI #: 000263356900006
ISSN: 1068-3372
Category: A1
Type: Journal Contribution
Validation: ecoom, 2010
Appears in Collections: Research publications

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