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Competing surface reactions limiting the performance of ion-sensitive field-effect transistors

Stoop, Ralph L. and Wipf, Mathias and Müller, Steffen and Bedner, Kristine and Wright, Iain A. and Martin, Colin J. and Constable, Edwin C. and Fu, Wangyang and Tarasov, Alexey and Calame, Michel and Schönenberger, Christian. (2015) Competing surface reactions limiting the performance of ion-sensitive field-effect transistors. Sensors and actuators. B, Chemical, 220. pp. 500-507.

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Official URL: http://edoc.unibas.ch/40693/

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Abstract

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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik
05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Calame, Michel and Schönenberger, Christian and Stoop, Ralph and Wipf, Mathias and Bedner, Kristine and Wright, Iain and Martin, Colin and Constable, Edwin Charles and Fu, Wangyang and Tarasov, Alexey
Item Type:Article, refereed
Publisher:Elsevier
ISSN:0925-4005
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:01
Deposited On:10 May 2016 12:25

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