Abstract
A novel fluorescent probe of copper nanosheets (Cu NS) with blue emission was synthesized using ascorbic acid (AA) as stabilizer and reductant, which was characterized with TEM, XPS, and FT-IR. Several studies that include optical spectra, FT-IR spectra, and fluorescence lifetime were provided to explore the fluorescence quenching mechanism between Cu NS and Fe3+, negating inner filter effect (IFE) and fluorescence resonance energy transfer (FRET), which was found to be dynamic quenching through electron transfer. Due to the reducing property of AA, the fluorescence of Cu NS was restored. Additionally, the Stern–Volmer equation was established to calculate Kq and Ksv demonstrating the quenching rate. Based on the dynamic quenching via oxidation–reduction reaction, a method was developed for the sequential detection of Fe3+ and AA, which showed brilliant sensitivity and high selectivity. The detection ranges of Fe3+ and AA were 0.06–59.4 μM and 0.06–24.4 μM, with the LOD of 31.0 nM and 7.0 nM, respectively. Furthermore, the proposed method was successfully applied to the detection of real water samples and vitamin C (VC) tablet samples with recovery range 95.03–103.25% and 96.28–101.02%. Cu NS was promising for monitoring the concentration of Fe3+ in the environment and drug analysis of AA.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (21765015, 21808099) and the Science and Technology Innovation Platform of Jiangxi Province (20192BCD40001), China. At the same time, the authors would like to thank Shiyanjia Lab (www.shiyanjia.com) for the TEM analysis.
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Wu, S., Peng, Z. & Qiu, P. Sequential Detection of Fe3+ and Ascorbic Acid with Cu Nanosheets as Fluorescent Probe and Their Application. Chemistry Africa 5, 641–650 (2022). https://doi.org/10.1007/s42250-022-00354-z
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DOI: https://doi.org/10.1007/s42250-022-00354-z