Abstract
Herein, a miniaturized, three-electrode paper-based electrochemical sensing platform for selective and sensitive electroanalytical sensing of hypochlorite has been reported. A hybrid method for fabricating the electrochemical device on the paper-based substrate, using ink-jet printing with conductive carbon inks as counter and reference electrode, has been demonstrated. Further, a CuO@Graphite sheet was incorporated separately using adhesive double-sided tape on the paper-based substrate, which served as the working electrode. The prepared device was subjected to hypochlorite solution of 1 mM to explore the electrochemical behavior of chlorine. Cyclic voltammetry (CV) and square-wave voltammetry (SQWV) were leveraged in the potential window of − 0.7 V to 0 V for conducting the experiments, whereby a sharp reduction peak at a peak potential E0 = − 0.43 V vs Ag/AgCl was obtained. Further, the consequence of potential scan rate and the effect of concentration and interference from other chemicals were also analyzed. A linear concentration range of 90–10 nM and a detection limit of 13.15 nM (9.78 × 10–4 ppm) with standard deviation of 1.013 were obtained. The fabricated paper-based electrode system was also tested on real samples such as lake water and tap water and the results are presented.
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Acknowledgements
The authors would like to thank Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India (Grant No. SPG/2021/001087) for funding this research work. Dr. Khairunnnisa Amreen acknowledges St. Anns College for women-Mehdipatnam, Hyderabad, for their support and expresses her gratitude to Department of Health Research, Indian Council of Medical Research (DHR- ICMR) for providing financial assistance (Grant No. YSS/2020/000086).
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Ray, A., Mohan, J.M., Amreen, K. et al. Ink-jet-printed CuO nanoparticle-enhanced miniaturized paper-based electrochemical platform for hypochlorite sensing. Appl Nanosci 13, 1855–1861 (2023). https://doi.org/10.1007/s13204-021-02235-2
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DOI: https://doi.org/10.1007/s13204-021-02235-2