Synthesis of nitrogen-doped lignin/DES carbon quantum dots as a fluorescent probe for the detection of Fe3+ ions

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Abstract

Carbon quantum dots (CQDs) as a rising star of carbon nanomaterials have extensive applications due to their excellent characteristics. In this work, we introduce a simple and green method to prepare nitrogen-doped lignin carbon quantum dots (N-L-CQDs) by using alkali lignin carbon sources and deep eutectic solvent (DES) as solution and nitrogen source. The physiochemical characterization results suggested that N-L-CQDs with diameters ranging from 4 to 12 nm were successfully synthesized. The optical properties data indicated that the as-prepared N-L-CQDs with a quantum yield of 7.95% exhibited excellent optoelectronic properties, excitation-dependent and pH stability. After that, we have investigated the N-L-CQDs used as fluorescent probes to detect iron ions, which suggested that the as-prepared N-L-CQDs exhibited excellent sensitivity and selectivity for Fe3+ with a detection limit of 0.44 μM. Besides, cytotoxicity of N-L-CQDs was also evaluated by MTT assay. These results demonstrated that the as-prepared N-L-CQDs with excellent properties have potential applications in environment and biomedicine.

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Jiang, X., Shi, Y., Liu, X., Wang, M., Song, P., Xu, F., & Zhang, X. (2018). Synthesis of nitrogen-doped lignin/DES carbon quantum dots as a fluorescent probe for the detection of Fe3+ ions. Polymers, 10(11). https://doi.org/10.3390/polym10111282

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