Abstract
Here we report a novel electrochemical sensor based on Barium titanate / reduced graphene oxide nanocomposite (BaTiO3/rGO) for precise detection of 4-nitrophenol and Dopamine. The electrochemical characteristics of both analytes were studied using a glassy carbon electrode (GCE) modified with a BaTiO3/rGO composite film. Incorporating reduced graphene oxide (rGO) sheets with BaTiO3 nanoparticles notably improved the electrochemical reactivity of these analytes. The modified electrochemical sensor exhibits a wide linear detection range of 5 to 50 µM for 4-nitrophenol, with a remarkably low detection limit of 0.44 µM. Similarly, dopamine detection demonstrates consistent linearity spanning from 2.5 to 50 µM, with an impressive detection limit of 0.08 µM. Real-world assessments using tap water and human urine samples underscore the exceptional recovery results, highlighting its practical utility.
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Acknowledgements
MA thanks CSIR-India, for CSIR-SRF(NET) fellowship, file No. 09/013(0921)-2019-EMR-I. CSPT thanks Science and Engineering Research Board (SERB, India) for the financial support through grant no. ECR/2016/000298. DG and CSPT thank Banaras Hindu University, Varanasi for providing seed grant under IoE scheme (Dev. Scheme No. 6031). The authors also acknowledge help from the Department of Physics, and Department of Chemistry BHU for the use of instruments.
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Ali, M., Sharma, K., Guin, D. et al. BaTiO3/rGO nanocomposite modified glassy carbon electrode for electrochemical sensing of 4‑nitrophenol and dopamine in real samples. J Appl Electrochem 54, 1349–1363 (2024). https://doi.org/10.1007/s10800-023-02036-1
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DOI: https://doi.org/10.1007/s10800-023-02036-1