Simultaneous reduction of graphene oxide (GO) and formation of rGO/Gly-Gly composite for sensitive detection of Cu2+ ions

Here, we report the sensitive detection of copper (Cu2+) ions using field-effect transistor (FET) based on reduced graphene oxide/glycylglycine (rGO/Gly-Gly) composite. The simultaneous reduction of graphene oxide (GO) using glycylglycine, and formation of rGO/Gly-Gly confirmed by employing X-ray diffraction (XRD), Ultraviolet–visible (UV-vis) spectroscopy, and fourier-transform infrared spectroscopy(FTIR). The formation of rGO/Gly-Gly composite was confirmed by FTIR spectroscopy. Further, the sensing channel was fabricated with rGO/Gly-Gly and explored for the electrical detection of Cu2+ ions between the concentration range of 100 ppb to 600 ppb. Present study recommends that rGO/Gly-Gly are encouraging for low-cost, portable, and real-time detectionof heavy metal ion sensors.