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Sensors 2014, 14(2), 3267-3283; doi:10.3390/s140203267
Article

Modelling of Impulsional pH Variations Using ChemFET-Based Microdevices: Application to Hydrogen Peroxide Detection

1,2
,
1,2
,
1,2
 and
1,2,*
1 CNRS, LAAS, 7 avenue du colonel Roche, F-31400 Toulouse, France 2 University of Toulouse, UPS, LAAS; F-31400 Toulouse, France
* Author to whom correspondence should be addressed.
Received: 30 December 2013 / Revised: 7 February 2014 / Accepted: 12 February 2014 / Published: 19 February 2014
(This article belongs to the Section Chemical Sensors)
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Abstract

This work presents the modelling of impulsional pH variations in microvolume related to water-based electrolysis and hydrogen peroxide electrochemical oxidation using an Electrochemical Field Effect Transistor (ElecFET) microdevice. This ElecFET device consists of a pH-Chemical FET (pH-ChemFET) with an integrated microelectrode around the dielectric gate area in order to trigger electrochemical reactions. Combining oxidation/reduction reactions on the microelectrode, water self-ionization and diffusion properties of associated chemical species, the model shows that the sensor response depends on the main influential parameters such as: (i) polarization parameters on the microelectrode, i.e., voltage (Vp) and time (tp); (ii) distance between the gate sensitive area and the microelectrode (d); and (iii) hydrogen peroxide concentration ([H2O2]). The model developed can predict the ElecFET response behaviour and creates new opportunities for H2O2-based enzymatic detection of biomolecules.
Keywords: modelling; ChemFET; microelectrode; H2O electrolysis; H2O2 detection modelling; ChemFET; microelectrode; H2O electrolysis; H2O2 detection
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Diallo, A.K.; Djeghlaf, L.; Launay, J.; Temple-Boyer, P. Modelling of Impulsional pH Variations Using ChemFET-Based Microdevices: Application to Hydrogen Peroxide Detection. Sensors 2014, 14, 3267-3283.

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