Microchimica Acta ( IF 5.3 ) Pub Date : 2023-07-29 , DOI: 10.1007/s00604-023-05922-9
Linhong Liao 1 , Xiao Lin 1 , Kai Wang 2 , Zhiyuan Hu 1 , Fengshou Wu 1
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The preparation of nitrogen and sulfur co-doped carbon dots (N, S-CDs) with highly bright orange-red fluorescence is reported through a facile solvothermal approach with naphthalenetetracarboxylic dianhydride as starting material. The N, S-CDs exhibited superior properties, including intense long-wavelength emission with a narrow full width at half maxima (FWHM) of 33 nm, high fluorescence quantum yield (QY) of 60.5% in aqueous solution, excitation-independent emission behavior, and excellent water dispersibility. In addition, sulfide ions (S2−) could selectively recover the fluorescence of N, S-CDs quenched by Sn2+. The selective experiment suggested that the N, S-CDs/Sn2+ complex could be used as a fluorescence-enhancement sensor for sulfide ions (S2−), with the linear range of 5–50 μM and the LOD of 0.35 μM. The practicality and feasibility of this sensor for the determination of sulfide ions in tap and lake water were verified with good recoveries. Furthermore, because of their highly bright fluorescence and strong water solubility, the N, S-CDs could be easily fabricated into fluorescent ink and transparent films, demonstrating the promising application in anti-counterfeiting. Therefore, the designed N, S-CDs exhibited the advantages of facile preparation, intense fluorescence, high stability, easy processing, and selective fluorescence change for specific analytes, which showed high potential in fluorescence detection and anti-counterfeiting.
Graphical abstract
中文翻译：
高发光氮硫共掺杂碳点，用于 Sn2+ 和 S2− 传感和双模式防伪
以萘四甲酸二酐为起始原料，通过简单的溶剂热方法制备了具有高亮橙红色荧光的氮和硫共掺杂碳点（N，S-CD）。N、S-CD表现出优异的性能，包括强烈的长波发射，半峰全宽（FWHM）为33 nm，水溶液中荧光量子产率（QY）高达60.5％，与激发无关的发射行为，以及优异的水分散性。此外，硫离子(S 2− )可以选择性地恢复被Sn 2+猝灭的N,S-CDs的荧光。选择性实验表明，N,S-CDs/Sn 2+复合物可用作硫离子（S 2−）的荧光增强传感器，线性范围为5-50 μM，LOD为0.35 μM。验证了该传感器测定自来水和湖水中硫化物离子的实用性和可行性，且回收率良好。此外，由于N、S-CD具有高亮度的荧光和强水溶性，可以很容易地制成荧光油墨和透明薄膜，在防伪方面具有广阔的应用前景。因此，所设计的N、S-CD具有制备简便、荧光强、稳定性高、易于加工、对特定分析物选择性荧光变化等优点，在荧光检测和防伪方面显示出巨大的潜力。
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