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

Sensors

Abdou Karim Diallo¹  Lyes Djeghlaf¹  Jerome Launay¹ 

[1] CNRS, LAAS, 7 avenue du colonel Roche, F-31400 Toulouse, France; E-Mails:

关键词: modelling;    ChemFET;    microelectrode;    H₂O electrolysis;    H₂O₂ detection;   

DOI  :  10.3390/s140203267

来源: mdpi

【 摘 要 】

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 (V_p) and time (t_p); (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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.