Abstract
An amperometric nitrite sensor is reported based on a screen-printed carbon electrode (SPCE) modified with copper(II)-benzene-1,4-dicarboxylate (Cu-BDC) frameworks and iron(III) oxide nanoparticles (Fe2O3 NPs). First, copper(I) oxide (Cu2O) nanocubes were synthesized, followed by a solvothermal reaction between Cu2O and H2BDC to form square plate-like Cu-BDC frameworks. Then, Fe2O3 NPs were electrodeposited on Cu-BDC frameworks using a potentiostatic method. The Fe2O3@Cu-BDC nanocomposite benefits from high conductivity and large active surface area, offering excellent electrocatalytic activity for nitrite oxidation. Under optimal amperometric conditions (0.55 V vs. Ag/AgCl), the sensor has a linear range of 1 to 2000 µM with a detection limit of 0.074 µM (S/N = 3) and sensitivity of 220.59 µA mM−1 cm−2. The sensor also provides good selectivity and reproducibility (RSD = 1.91%, n = 5). Furthermore, the sensor exhibits long-term stability, retaining 91.4% of its original current after 4 weeks of storage at room temperature. Finally, assessing nitrite in tap and mineral water samples revealed that the Fe2O3@Cu-BDC/SPCE has a promising prospect in amperometric nitrite detection.
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Acknowledgements
The authors acknowledge the financial support from the Fundamental Research Grant Scheme (FRGS) FRGS/1/2021/STG05/UPM/01/1 awarded by the Ministry of Higher Education of Malaysia (MOHE). R. K. A. Amali thanks the Sri Lanka Council for Agricultural Research Policy (SLCARP) for a Ph.D. scholarship.
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R.K.A.A.: formal analysis, methodology, investigation, data curation, writing — original draft, writing — review and editing. H.N.L.: conceptualization, supervision, writing — review and editing. I.I.: visualization, writing — review and editing. Z.Z.: supervision. S.A.A.A.: supervision.
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Amali, R.K.A., Lim, H.N., Ibrahim, I. et al. A copper-based metal–organic framework decorated with electrodeposited Fe2O3 nanoparticles for electrochemical nitrite sensing. Microchim Acta 189, 356 (2022). https://doi.org/10.1007/s00604-022-05450-y
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DOI: https://doi.org/10.1007/s00604-022-05450-y