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|Title: ||Competing surface reactions limiting the performance of ion-sensitive field-effect transistors|
|Authors: ||Stoop, Ralph L.|
Wright, Iain A.
Martin, Colin J.
Constable, Edwin C.
|Keywords: ||Ion-sensitive field-effect transistor|
Competing surface reactions
|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
|Version: ||Accepted for publication|
|Publisher Link: ||http://dx.doi.org/10.1016/j.snb.2015.05.096|
|Appears in Collections:||Published Articles (Chemistry)|
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