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<p>This study presents a CuO/NiO/MWCNT-modified electrode that exhibits supercapacitor behaviour and simultaneous neurotransmitter sensing, enabling its potential use in self-powered biosensors. The composite was synthesised via a co-precipitation method, and its structural and chemical composition was confirmed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), UV-Vis spectroscopy, and scanning electron microscopy (SEM), demonstrating successful functionalisation and enhanced surface area. The electrochemical response of the modified glassy carbon electrode (MWCNT/CuO/NiO/MGCE) was evaluated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV), revealing highly selective and sensitive detection of dopamine (DA) and serotonin (5-HT) with detection limits of 0.87&#xa0;µM (DA) and 0.65&#xa0;µM (5-HT). The well-separated oxidation peaks with a peak-to-peak separation of 131&#xa0;mV confirmed interference-free simultaneous quantification. Additionally, the electrode exhibited a specific capacitance of 48.3 F/g at 10&#xa0;mV/s, indicating stable charge storage performance. These findings establish the CuO/NiO/MWCNT-modified electrode as a strong candidate for integrated self-powered biosensors, where the synergy between charge storage and biosensing functionalities can enable real-time, autonomous neurotransmitter monitoring.</p> Graphical abstract <p></p>

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CuO/NiO/MWCNT-modified electrode for simultaneous neurotransmitter detection and energy storage for self-powered biosensors

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • K. R. Rajashekar,
  • M. D. Sagar,
  • R. B. Raghavendra,
  • Sathish Reddy,
  • Thejas Urs G.,
  • G. K. Gowtham

摘要

This study presents a CuO/NiO/MWCNT-modified electrode that exhibits supercapacitor behaviour and simultaneous neurotransmitter sensing, enabling its potential use in self-powered biosensors. The composite was synthesised via a co-precipitation method, and its structural and chemical composition was confirmed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), UV-Vis spectroscopy, and scanning electron microscopy (SEM), demonstrating successful functionalisation and enhanced surface area. The electrochemical response of the modified glassy carbon electrode (MWCNT/CuO/NiO/MGCE) was evaluated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV), revealing highly selective and sensitive detection of dopamine (DA) and serotonin (5-HT) with detection limits of 0.87 µM (DA) and 0.65 µM (5-HT). The well-separated oxidation peaks with a peak-to-peak separation of 131 mV confirmed interference-free simultaneous quantification. Additionally, the electrode exhibited a specific capacitance of 48.3 F/g at 10 mV/s, indicating stable charge storage performance. These findings establish the CuO/NiO/MWCNT-modified electrode as a strong candidate for integrated self-powered biosensors, where the synergy between charge storage and biosensing functionalities can enable real-time, autonomous neurotransmitter monitoring.

Graphical abstract