Femtomolar detection of Cu2+ ions in solution using super-Nernstian FET-sensor with a lipid monolayer as top-gate dielectric - Archive ouverte HAL Access content directly
Journal Articles Sensors and Actuators B: Chemical Year : 2020

Femtomolar detection of Cu2+ ions in solution using super-Nernstian FET-sensor with a lipid monolayer as top-gate dielectric

Abstract

The development of ions sensors with low limit of detection and high sensitivity and selectivity is required in many fields of application and still remains a challenge. We report on the first dual-gated field effect transistor sensor with an engineered lipid monolayer as top gate dielectric. The sensor was designed and fabricated for the specific detection of Cu 2+ using the Di-2-picolylamine as recognition unit. The lipid monolayer was reticulated to achieve high mechanical and dielectric stability over device operation. The resulting sensor exhibits exceptional performances with a limit of detection at 10 femtomolar, with a linear dependency over 10 decades and a super-Nernstian sensitivity of ~100 mV/decade. We also show that the lipid layer forms a good barrier to ions trapping, hence providing a high stability of the sensor over measurements.
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Dates and versions

hal-02560471 , version 1 (01-05-2020)

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A. Kenaan, F. Brunel, J.-M. Raimundo, Anne Charrier. Femtomolar detection of Cu2+ ions in solution using super-Nernstian FET-sensor with a lipid monolayer as top-gate dielectric. Sensors and Actuators B: Chemical, 2020, 316, pp.128147. ⟨10.1016/j.snb.2020.128147⟩. ⟨hal-02560471⟩
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