Liao Linhong, Lin Xiao, Wang Kai, Hu Zhiyuan, Wu Fengshou
Hubei key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, 430205, People's Republic of China.
Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, People's Republic of China.
Mikrochim Acta. 2023 Jul 29;190(8):335. doi: 10.1007/s00604-023-05922-9.
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 (S) could selectively recover the fluorescence of N, S-CDs quenched by Sn. The selective experiment suggested that the N, S-CDs/Sn complex could be used as a fluorescence-enhancement sensor for sulfide ions (S), 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.
报道了一种以萘四羧酸二酐为起始原料，通过简便的溶剂热法制备具有高亮度橙红色荧光的氮硫共掺杂碳点（N，S-CDs）。N，S-CDs表现出优异的性能，包括在长波长处有强烈发射，半高宽（FWHM）窄至33nm，在水溶液中的荧光量子产率（QY）高达60.5%，发射行为不依赖于激发，以及出色的水分散性。此外，硫离子（S²⁻）能够选择性地恢复被Sn²⁺淬灭的N，S-CDs的荧光。选择性实验表明，N，S-CDs/Sn²⁺配合物可作为硫离子（S²⁻）的荧光增强传感器，线性范围为5-50μM，检测限为0.35μM。该传感器用于测定自来水和湖水中硫离子的实用性和可行性得到了验证，回收率良好。此外，由于其高亮度荧光和强水溶性，N，S-CDs可以很容易地制成荧光墨水和透明薄膜，显示出在防伪方面的应用前景。因此，所设计的N，S-CDs具有制备简便、荧光强烈、稳定性高、易于加工以及对特定分析物有选择性荧光变化等优点，在荧光检测和防伪方面具有很高的潜力。
