Graphene oxide/copper terephthalate composite as a sensing platform for nitrite quantification and its application to environmental samples

A robust electrochemical sensing platform based on graphene oxide-copper terephthalate (GO/Cu-tpa) composite has been fabricated. The prepared composite was characterized through FTIR, XRD, SEM, and EDS techniques. The electrochemical characterization of the composite was studied after immobilizing the composite material as a thin film on the glassy carbon electrode through voltammetry techniques. The fabricated electrode exhibited an excellent electrocatalytic activity in the oxidation of nitrite. The sensor showed a linear response in the concentration range 5 – 625 μM with a detection limit of 0.3 μM and sensitivity of 0.86 ± 0.06 μA μM −1 cm −2 . The electrochemical sensor was validated by measuring the trace level nitrite from water samples, and the results are in good agreement with the standard protocol. Graphical abstract Schematic representation of GO/Cu-terepthalate composite preparation and fabrication of nitrite sensor