Document Type

Article

Publication Date

12-2017

Publication Title

Sensors and Actuators B: Chemical

Volume

253

Publisher

Elsevier

Abstract

Graphene-based ion sensitive field effect transistors (GISFETs) with high sensitivity and selectivity for K+ ion detection have been demonstrated utilizing valinomycin based ion selective membrane. The performance of the GISFETs for K+ ion detection was studied in various media over a concentration range of 1 μM–2 mM. The sensitivity of the sensor was found to be >60 mV/decade, which is comparable to the best Si-based commercial ISFETs, with negligible interference found from Na+ and Ca2+ ions in high concentration. The sensor performance did not change significantly in Tris–HCl solution or with repeated testing over a period of two months highlighting its reliability and effectiveness for physiological monitoring. The performance of the sensor also remained unchanged when fabricated on biocompatible polyethylene terephthalate (PET) substrate, showing significant potential for developing flexible bio-implantable graphene-based ISFETs.

Comments

This manuscript has been published in Sensors and Actuators B: Chemical. Please find the published version here (note that a subscription is necessary to access this version):

http://www.sciencedirect.com/science/article/pii/S0925400517311486

Elsevier holds the copyright in this article.

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