College of Materials and Chemical Engineering, Pingxiang University, Pingxiang, China.
Luminescence. 2024 Nov;39(11):e70011. doi: 10.1002/bio.70011.
Existing permanganates (MnO ) sensing methods suffered from the poor selectivity, restricted solubility, and/or less desirable signaling mechanisms (e.g., "turn-off" processes), resulting in the false positive result. In this work, an effective "turn-on" fluorescence method for MnO detection in aqueous media was proposed via yellow fluorescence carbon dots (Y-CDs) with the maximum emission peak of 553 nm. Upon the introduction of MnO , the fluorescence of Y-CDs increased significantly due to the enhanced surface passivation degree and intramolecular charge transfer. In the range of 0.1-10 μM, the fluorescence ratio (F/F) is proportional to the MnO ions concentration, realizing the "turn-on" fluorescence sensing of MnO . On the other hand, utilizing the significant color change of Y-CDs by MnO ions, the colorimetric analysis can also be established for MnO assay. Compared with other probes, the analysis results obtained by bimodal sensing tactics of fluorescent and colorimetric can be mutually verified to improve the reliability and meet the sensing needs of targets in complex environments.
现有的高锰酸盐（MnO ）传感方法存在选择性差、溶解度有限和/或不理想的信号机制（例如，“关闭”过程），导致假阳性结果。在这项工作中，通过具有最大发射峰为 553nm 的黄色荧光碳点（Y-CDs），提出了一种在水介质中检测 MnO 的有效“开启”荧光方法。在引入 MnO 后，由于表面钝化程度和分子内电荷转移的增强，Y-CDs 的荧光显著增强。在 0.1-10μM 范围内，荧光比（F/F）与 MnO 离子浓度成正比，实现了 MnO 的“开启”荧光传感。另一方面，利用 MnO 离子对 Y-CDs 的显著颜色变化，也可以建立用于 MnO 分析的比色分析。与其他探针相比，荧光和比色双模态传感策略的分析结果可以相互验证，以提高可靠性并满足复杂环境中目标的传感需求。
