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Electrokinetic-assisted gating in a microfluidic integrated Si nanoribbon ion sensor for enhanced sensitivity
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics. Uppsala University, Uppsala, Sweden.ORCID iD: 0000-0002-6235-2891
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-5260-5322
2018 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 262, p. 974-981Article in journal (Refereed) Published
Abstract [en]

Using the electrokinetic principle, we demonstrate a novel approach to modulate the response of an ion sensitive silicon-nanoribbon field-effect-transistor, effectively manipulating the device sensitivity to a change in surface potential. By using the streaming potential effect we show that the changes in the surface potential induced by e.g. a pH change can be accurately manipulated in a microfluidic-integrated chip leading to an enhanced response. By varying the flow velocity and the biasing condition along the microfluidic channel, we further demonstrate that the pH response from such a device can also be suppressed or even reversed as a function of the flow velocity and the biasing configuration. Experiments performed with different pH buffer shows that the sensor response can be enhanced/suppressed by several times in magnitude simply by using the streaming potential effects. A mathematical description is also presented for qualitative assessment of the electrokinetic influence on the gate terminal under different biasing condition. The approach presented here shows the prospect to exploit the electrokinetic modulation for developing highly sensitive nanoscale biosensors. © 2018 Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 262, p. 974-981
Keywords [en]
Electrokinetic effect, Ion sensitive field-effect transistor, Microfluidics, pH sensing, Silicon nanoribbon, Streaming potential
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-227556DOI: 10.1016/j.snb.2018.02.017ISI: 000427460600116Scopus ID: 2-s2.0-85042270625OAI: oai:DiVA.org:kth-227556DiVA, id: diva2:1206525
Funder
Swedish Research Council, 2016-05051Knut and Alice Wallenberg Foundation, 2011.0113
Note

QC 20180517

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved

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Dev, ApurbaLinnros, Jan

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