Abstract
Herein, Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/reduced graphene oxide (rGO) (PEDOT:PSS/rGO) composite was prepared and further functionalized with L-Cysteine (LC) to manifest sensitive and selective detection of copper (Cu2+) and lead (Pb2+) ions using Field Effect Transistor (FET) in the concentration range of 1–60 µg/L. The sensor (PEDOT:PSS/rGO/L-Cysteine) exhibits low-voltage operations, highly sensitive and selective towards target metal ions (Cu2+ and Pb2+). The lower detection limits for Cu2+ and Pb2+ were found to be 0.33 µg/L and 2.36 µg/L, which is well below the World Health Organization WHO recommendations (2 mg/L (2 ppm) for Cu2+ ions and 10 µg/L (10 ppb) for Pb2+ ions.
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