| Autor: |
Le, Son T., Cho, Seulki, Zaslavsky, Alexander, Richter, Curt A., Balijepalli, Arvind K. |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 6/27/2022, Vol. 120 Issue 26, p1-6, 6p |
| Abstrakt: |
Field-effect transistors (FETs) are versatile tools for high-precision biophysical measurements, and their measurement sensitivity and resolution can be improved by using innovative materials and device designs. Here, we report on the sensitivity and noise performance of dual-gated graphene FETs. When measuring pH, our devices exhibit a sensitivity of up to 30 V per unit change in pH, ≈500-fold greater than the Nernst value at room temperature, and noise-limited resolution of 2 × 10−4 in the biomedically relevant 0.1–10 Hz bandwidth. This level of performance is obtained due to a highly asymmetric dual-gate design utilizing an ionic liquid top-gate dielectric coupled with graphene's large intrinsic quantum capacitance (≈15 μC/cm2). Our results improve upon the sensitivity and resolution of previously demonstrated Si- and MoS2-channel FET biosensors. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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