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We have reported an effective electrochemical sensor for assorted pesticide (i.e., Fenitrothion). Exact tracking of these pesticides has become more important for protecting the environment and food resources owing to their high toxicity. Hence, the development of compatible sensors for the real-time detection of pesticides is imperative to overcome practical limitations encountered in conventional methodologies. In this regard, the role of the novel, advanced functional materials such as niobium carbide (NbC) supported on molybdenum nanoparticles (NbC@Mo) has drawn great consideration in conventional sensory systems because of their numerous advantages over other nanomaterials. The nanocomposite was characterized by XRD, XPS, HR-TEM, and EIS. Under optimized working conditions, the modified electrode NbC@Mo/SPCE responds linearly as 0.01–1889 μM concentration range and the detection limit is 0.15 nM. Most importantly, the method was successfully demonstrated in fruit samples. [ABSTRACT FROM AUTHOR]

• Sonochemical synthesis of CuO/CeO 2 based nanomaterial was developed. • CuO/CeO 2 is characterized by FESEM, EDX, XRD and electrochemical studies. • CuO/CeO 2 based electro-catalyst was demonstrated towards dopamine sensor. • CuO/CeO 2 modified electrode used for real time demonstration in biological and drug samples. A nanostructured and high conductive cupric oxide (CuO NPs) with hierarchical CeO 2 sheets-like structure was synthesized by a facile sonochemical approach. Furthermore, CuO/CeO 2 nanostructure is synthesized by high-intensity ultrasonic probe (Ti-horn, 50 kHz and 100 W) at ambient air. Moreover, the synthesized CuO/CeO 2 material was characterized by various analytical techniques including FESEM, EDX, XRD and electrochemical methods. Then, the synthesized CuO/CeO 2 composite was applied for the electrocatalytic detection of dopamine using CV and DPV techniques. In addition, the CuO/CeO 2 modified electrode has good electrocatalytic performance with high linear range from 0.025 to 98.5 µM towards the determination of dopamine drug and high sensitivity of the CuO/CeO 2 modified drug sensor was calculated as 16.34 nM and 4.823 μA·µM−1·cm−2, respectively. Moreover, a repeatability, reproducibility and stability of the CuO@CeO 2 mixture modified electrode were analyzed towards the determination of dopamine biomolecule. Interestingly, the real time application of CuO@CeO 2 modified electrode was established in different serum and drug samples. [ABSTRACT FROM AUTHOR]