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Selective Sodium Sensing with Gold-Coated Silicon Nanowire Field-Effect Transistors in a Differential Setup

Wipf, Mathias and Stoop, Ralph L. and Tarasov, Alexey and Bedner, Kristine and Fu, Wangyang and Wright, Ian A. and Constable, Edwin C. and Martin, Colin J. and Calame, Michel and Schönenberger, Christian. (2013) Selective Sodium Sensing with Gold-Coated Silicon Nanowire Field-Effect Transistors in a Differential Setup. ACS Nano, 7 (7). pp. 5978-5983.

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Official URL: http://edoc.unibas.ch/dok/A6212022

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Abstract

Ion-sensitive field-effect transistors based on silicon nanowires with high dielectric constant gate oxide layers (e.g., Al2O3 or HfO2) display hydroxyl groups which are known to be sensitive to pH variations but also to other ions present in the electrolyte at high concentration. This intrinsically nonselective sensitivity of the oxide surface greatly complicates the selective sensing of ionic species other than protons. Here, we modify individual nanowires with thin gold films as a novel approach to surface functionalization for the detection of specific analytes. We demonstrate sodium ion (Na+) sensing by a self-assembled monolayer (SAM) of thiol-modified crown ethers in a differential measurement setup. A selective Na+ response of ≈−44 mV per decade in a NaCl solution is achieved and tested in the presence of protons (H+), potassium (K+), and chloride (Cl–) ions, by measuring the difference between a nanowire with a gold surface functionalized by the SAM (active) and a nanowire with a bare gold surface (control). We find that the functional SAM does not affect the unspecific response of gold to pH and background ionic species. This represents a clear advantage of gold compared to oxide surfaces and makes it an ideal candidate for differential measurements.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Wipf, Mathias and Stoop, Ralph and Bedner, Kristine and Fu, Wangyang and Wright, Iain and Constable, Edwin Charles and Calame, Michel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:1936-0851
e-ISSN:1936-086X
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:03 May 2017 14:16
Deposited On:31 Jan 2014 09:51

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