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QUANTUM-LIMITED 2D SENSORS FOR PH AND BIOSENSING

Published

Author(s)

Arvind K. Balijepalli, Son T. Le, Harish C. Pant, Curt A. Richter

Abstract

We have developed biosensors based on dual-gated field-effect transistors (FETs) that operate at the quantum capacitance limit. The FETs are fabricated with atomically thin MoS2 semiconducting films and top-gated with a room temperature ionic-liquid. The high ionic liquid polarizability allows strong coupling between the top (ionic liquid) and back-gate (substrate oxide) dielectrics, which enables the amplification of a voltage applied to the ionic liquid gate by 200x, limited only by the quantum capacitance of the channel. The devices operate near their theoretical limits, thereby enabling new applications in biosensing, beyond the reach of traditional FET-based sensors.
Proceedings Title
Proceedings of Micro Total Analysis Systems 2019
Conference Dates
October 27-30, 2019
Conference Location
Basel

Keywords

Field-effect transistor (FET), MoS2, Biosensor, Super-Nernstian, pH, Enzyme activity

Citation

Balijepalli, A. , Le, S. , Pant, H. and Richter, C. (2019), QUANTUM-LIMITED 2D SENSORS FOR PH AND BIOSENSING, Proceedings of Micro Total Analysis Systems 2019, Basel, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928441 (Accessed April 18, 2024)
Created September 26, 2019, Updated September 24, 2020