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Title: Competing surface reactions limiting the performance of ion-sensitive field-effect transistors
Authors: Stoop, Ralph L.
Wipf, Mathias
Muller, Steffen
Bedner, Kristine
Wright, Iain A.
Martin, Colin J.
Constable, Edwin C.
Fu, Wangyang
Tarasov, Alexey
Calame, Michel
Schonenberger, Christian
Keywords: Ion-sensitive field-effect transistor
Calcium sensing
Site-binding model
Competing surface reactions
Gold-coated nanoribbons
Issue Date: 2015
Publisher: © Elsevier
Citation: STOOP, R.L. ...et al., 2015. Competing surface reactions limiting the performance of ion-sensitive field-effect transistors. Sensors and Actuators, B: Chemical, 220, pp. 500-507.
Abstract: © 2015 Elsevier B.V. All rights reserved.Ion-sensitive field-effect transistors based on silicon nanowires are promising candidates for the detection of chemical and biochemical species. These devices have been established as pH sensors thanks to the large number of surface hydroxyl groups at the gate dielectrics which makes them intrinsically sensitive to protons. To specifically detect species other than protons, the sensor surface needs to be modified. However, the remaining hydroxyl groups after functionalization may still limit the sensor response to the targeted species. Here, we describe the influence of competing reactions on the measured response using a general site-binding model. We investigate the key features of the model with a real sensing example based on gold-coated nanoribbons functionalized with a self-assembled monolayer of calcium-sensitive molecules. We identify the residual pH response as the key parameter limiting the sensor response. The competing effect of pH or any other relevant reaction at the sensor surface has therefore to be included to quantitatively understand the sensor response and prevent misleading interpretations.
Description: This paper was accepted for publication in the journal Sensors and Actuators, B: Chemical and the definitive published version is available at http://dx.doi.org/10.1016/j.snb.2015.05.096
Sponsor: The authors gratefully acknowledge the support by the Swiss Nanoscience Institute (SNI), the Swiss Nano-Tera program, the European Commission under the FP7-NMP project Hysens (263091), the European Comission under the FP7-ICT project Symone (105244) and the Swiss National Science Foundation as part of the NCCR Molecular Systems Engineering
Version: Accepted for publication
DOI: 10.1016/j.snb.2015.05.096
URI: https://dspace.lboro.ac.uk/2134/25449
Publisher Link: http://dx.doi.org/10.1016/j.snb.2015.05.096
ISSN: 0925-4005
Appears in Collections:Published Articles (Chemistry)

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