Abstract
We report a facile and effective method for the preparation of strongly coordinated nickel cobaltite (NiCo2O4)-single-walled carbon nanotube (SWCNT) composite for electrochemical detection of very commonly encountered paraoxon ethyl (PEL) pesticide, to achieve picomolar limits detection. A substantial electronic interaction between the two components is confirmed by Raman spectroscopy and X-ray photoelectron spectroscopy studies. The NiCo2O4-SWCNTmodified glassy carbon electrode shows a LOD (2.03 pM) of two magnitudes higher than bare NiCo2O4 (33.7 nM), and also significantly higher when compared to all other metal-oxide-based composites reported in the literature so far, indicating its remarkable PEL sensing ability attributed to strong coordination between the two components. The sensor also has excellent stability and reproducibility. It also showed prospects of simultaneous detection of paraoxon ethyl and dopamine when probed for real-time samples such as cabbage and banana..
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