State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, PR China.
Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba R3T 5V6, Canada.
Mater Sci Eng C Mater Biol Appl. 2019 Jun;99:611-619. doi: 10.1016/j.msec.2019.02.003. Epub 2019 Feb 2.
Carbon dots (CDs), especially heteroatom doped CDs derived from natural resources, have attracted growing interest due to their multiple potential applications. In this work, nitrogen and sulfur co-doped CDs (N/S-CDs) with a high quantum yield of 13.3% were synthesized by a facile approach based on one-step combustion treatment of cellulose-based biowaste of willow catkin. Due to the existence of urea and sulfuric acid used in the combustion process, the generated yield of the obtained N/S-CDs was raised to be as high as 14.3%. N/S-CDs were characterized by high-resolution TEM, FT-IR spectroscopy, XPS spectroscopy and Raman spectroscopy. The formation mechanism of N/S-CDs was also explored. These N/S-CDs with an average diameter of 7.3 nm demonstrated superior photo-stability, low cytotoxicity, pH stability and could be used for selective and sensitive detection of Fe ions. Furthermore, based on their favorable feature of excellent biocompatibility and Fe ions detection capability, the use of such N/S-CDs for intracellular Fe ions detection application was also demonstrated.
碳点（CDs），特别是源自自然资源的杂原子掺杂 CDs，由于其多种潜在应用而引起了越来越多的关注。在这项工作中，通过基于一步燃烧处理柳棉生物质废料的简便方法合成了具有 13.3%高量子产率的氮硫共掺杂 CDs（N/S-CDs）。由于燃烧过程中使用了尿素和硫酸，所得到的 N/S-CDs 的产率高达 14.3%。通过高分辨率 TEM、FT-IR 光谱、XPS 光谱和拉曼光谱对 N/S-CDs 进行了表征。还探索了 N/S-CDs 的形成机制。这些平均直径为 7.3nm 的 N/S-CDs 表现出优异的光稳定性、低细胞毒性、pH 稳定性，可用于选择性和灵敏检测 Fe 离子。此外，基于其良好的生物相容性和 Fe 离子检测能力的特点，还展示了此类 N/S-CDs 在细胞内 Fe 离子检测应用中的用途。
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