Modelling of the migration effect occurring at an ISFET-based coulometric sensor-actuator system

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Luo, J. and Olthuis, W. and Schoot van der, B.H. and Bergveld, P. and Bos, M. and Linden van der, W.E. (1990) Modelling of the migration effect occurring at an ISFET-based coulometric sensor-actuator system. Analytica Chimica Acta, 237 . pp. 72-81. ISSN 0003-2670

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Abstract:The migration effect, in addition to diffusion, occurring at an ion-selective field-effect transistor (ISFET)-based coulometric sensor-actuator system has been studied. A diffusion-migration model is presented, based on the numerical solution of the Nernst-Planck equations of which a digital simulation is realized. Corresponding experiments were carried out and compared with the simulation. The results are in good agreement with the simulation.
Typical titration times of this system were found to be 0.5–10 s, corresponding to fully dissociated acid concentrations of 0.5×10−3−6.5×10−3 mol 1−1 with excess of supporting electrolyte. Both the simulation and experimental results show that if the concentration of the supporting electrolyte is 20 times higher than that of the species to be titrated, the deviation caused by migration is less than 5% and within the experimental error when pure diffusion is considered. At relatively low concentrations of supporting electrolyte, the migration effect should be taken into account to determine the concentrations of titrated species.
Item Type:Article
Copyright:© 1990 Elsevier
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/72814
Official URL:http://dx.doi.org/10.1016/S0003-2670(00)83903-3
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