article · RSC Advances
In this study, poly(luminol-<i>co</i>-1,8-diaminonaphthalene) (PLim-DAN) was synthesized and subsequently modified with MWCNTs and CeO<sub>2</sub> NPs. The synthesized nanocomposites were analyzed using IR, SEM, TEM, and XRD. Furthermore, a comprehensive set of thermal behavior measurements were taken using TGA/DTG analysis. Next, the electroactivity of the developed nanocomposites was tested as an electrochemical sensor to measure the concentration of Cr<sup>3+</sup> ions in phosphate buffers. The GCE adapted with the PLim-DAN/CeO<sub>2</sub>/CNTs-10% nanocomposite (NC) exhibited the highest current response among the other compositions and copolymers. The fabricated nanocomposite sensor showed high sensitivity, with a value of 19.78 μA μM<sup>-1</sup> cm<sup>-2</sup>, and a low detection limit of 4.80 ± 0.24 pM. The analytical performance was evaluated by plotting a current calibration curve <i>versus</i> the concentration of Cr<sup>3+</sup> ions. It was found to be linear (<i>R</i><sup>2</sup> = 0.9908) over the range of 0.1 nM to 0.1 mM, identified as the linear dynamic range (LDR). This electrochemical sensor demonstrated that it could be a useful tool for environmental monitoring by accurately detecting and measuring carcinogenic Cr<sup>3+</sup> ions in real-world samples.
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DOI: 10.1039/d4ra00542b
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