Cu-modified electrolyte-gated transistors based on reduced graphene oxide

Abstract

Electrodeposition of Cu coatings onto the gates of electrolyte-gated transistors based on reduced graphene oxide leads to efficient devices featuring a sensitivity equal to 1–3 mV and able to track emulated action potentials (frequency 0.1 Hz).

Harnessing Small-Molecule Analyte Detection in Complex Media: Combining Molecularly Imprinted Polymers, Electrolytic Transistors, and Machine Learning

“…The broad minimum is a result of the localized states in the rGO midgap. 20,22,23 Such a low density of states makes the electronic properties of rGO very sensitive to the surroundings, which is ideal for sensing applications. 32 Further discussions on the device operation and the origin of the current hysteresis are found in the SI (Figures S4 and S5).…”

“…Here, by sweeping V GS within a |0.5 V| window, the device response results in a transfer curve having a broad minimum and small anticlockwise current hysteresis, as shown in Figure B. The broad minimum is a result of the localized states in the rGO midgap. ,, Such a low density of states makes the electronic properties of rGO very sensitive to the surroundings, which is ideal for sensing applications . Further discussions on the device operation and the origin of the current hysteresis are found in the SI (Figures S4 and S5).…”

“…Electrolyte-gated transistors (EGTs) possess several advantages for chemical sensing and biosensing, which include inherent operation in aqueous medium, low working voltages (<1 V), and signal amplification ability. , Here, as the EGT active layer, we employed rGO since it offers additional advantages for PoC devices, such as high conductivity along with easy film processing from aqueous GO dispersions. , These characteristics make the rGO EGTs both simple to fabricate and efficient for chemical sensing and biosensing. − …”

Graphene Acetic Acid‐Based Hybrid Supercapacitor and Liquid‐Gated Transistor

“…The former acts as the active material of the LGT, whereas the latter must improve the gate efficiency by increasing its capacitance. [42] Aiming at these two crucial aspects of the transistor, two different GAA solutions have been exploited as follows: i) 5 mg mL −1 featuring an acidic pH related to the GAA cast onto the gate and ii) 1 mg mL −1 at alkaline pH corresponding to the GAA cast onto the channel. The former GAA solution yields rougher and thicker GAA coating since its concentration and pH favor a partial GAA agglomeration.…”

“…mechanical stress, change of ionic strength and emulated action potentials). [26,[40][41][42][43][44] Among GRMs, only rGO can be implemented in both supercapacitors and LGTs. For these reasons, we decided to provide an alternative candidate.…”