Understanding the Electrolyte Background for Biochemical Sensing with Ion-Sensitive Field-Effect Transistors

Tarasov, A. and Wipf, M. and Stoop, R. L. and Bedner, K. and Fu, W. Y. and Guzenko, V. A. and Knopfmacher, O. and Calame, M. and Schonenberger, C.. (2012) Understanding the Electrolyte Background for Biochemical Sensing with Ion-Sensitive Field-Effect Transistors. ACS nano, Vol. 6, H. 10. pp. 9291-9298.

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Official URL: http://edoc.unibas.ch/dok/A6070310

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Silicon nanowire field-effect transistors have attracted substantial interest for various biochemical sensing applications, yet there remains uncertainty concerning their response to changes in the supporting electrolyte concentration. In this study, we use silicon nanowires coated with highly pH-sensitive hafnium oxide (HfO2) and aluminum oxide (Al2O3) to determine their response to variations in KCI concentration at several constant pH values. We observe a nonlinear sensor response as a function of ionic strength, which Is independent of the pH value. Our results suggest that the signal is caused by the adsorption of anions (Cl-) rather than cations (K+) on both oxide surfaces. By comparing the data to three well-established models, we have found that none of those can explain the present data set. Finally, we propose a new model which gives excellent quantitative agreement with the data.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Wipf, Mathias and Stoop, Ralph and Fu, Wangyang and Knopfmacher, Oren and Calame, Michel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Mar 2013 11:14
Deposited On:01 Mar 2013 11:13

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