Abstract
A tri-metal oxide, MoO
2
·Fe
3
O
4
·CuO (TMO), was synthesized by the co-precipitation method and characterized by XRD, SEM-EDS, and FTIR. The average particle size of the nanocomposite was found to be 34.85 nm. The zeta potential and hydrodynamic size of the MoO
2
·Fe
3
O
4
·CuO nanocomposite were studied in acidic and basic pH respectively. A glassy carbon electrode (GCE) was modified by MoO
2
·Fe
3
O
4
·CuO to develop a chemical sensor for
para
-nitrophenol (
p
-NP). A simple
I
–
V
method was employed for this study. Excellent sensitivity, an ultra-low detection limit, long-term stability, and reproducibility of the MoO
2
·Fe
3
O
4
·CuO/Nafion/GCE sensor were observed towards
p
-NP. A linear calibration plot (
r
2
: 0.9995) was obtained for 1.0 pM to 0.01 mM aqueous
p
-NP solution, with a sensitivity value of 5.2430 μA μM
−1
cm
−2
and remarkably low detection limit (LOD) of 0.2 pM.