期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 253, 期 -, 页码 759-765出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.06.129
关键词
Graphene; Ion sensitive field effect transistor; K+ ion detection; Ion selective membrane
资金
- National Science Foundation [IIP-1512342, CBET-1606882, IIP-1602006]
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 mu M-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. (C) 2017 Elsevier B.V. All rights reserved.
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