Novel Processing for Color-Tunable Luminescence Carbon Dots and Their Advantages in Biological Systems
Novel Processing for Color-Tunable Luminescence Carbon Dots and Their Advantages in Biological Systems
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颜色可调发光碳点的新工艺及其在生物系统中的优势
DOI：
10.1021/acssuschemeng.0c01016
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发表时间：
2020-06-15
影响因子：
8.4
通讯作者：
Dong, Chuan
中科院分区：
文献类型：
--
作者：
Jiao, Yuan;Liu, Yang;Dong, Chuan
采用一锅水热法制备了具有优异分散性的可调色碳点（CDs）。随着前驱体溶液从碱性到酸性的调整，CDs的最佳发光从绿色逐渐变为红色。本文提出的三种具有代表性的CDs分别在碱性、中性和酸性水溶液上制备的全绿色、黄色和红色荧光，其碳芯中具有相似的石墨结构，而这些CDs中PL发射的多样化被认为是由于它们的粒径和氮掺杂含量的差异。此外，三种类型cd的计算带隙的规律变化与它们的PL发射特性完全一致。基于表面状态差异对其自由基清除能力的进一步研究表明，在碱性条件下合成的CDs具有更强的抗氧化能力。因此，我们可以推测，对苯二胺前体上的氨基在酸性条件下更容易被激活，从而导致深度交联，从而促进长波发射。此外，这些彩色光盘的特殊生物相容性使其在生物系统中的应用具有巨大的潜力。
The novel strategy for color-tunable carbon dots (CDs) with superior dispersibility in an aqueous solution is originally proposed in a one-pot hydrothermal method. The optimized emission of resulted CDs progressively shifts from green to red with the adjustment of precursor solution from alkali to acid. The proposed three representative CDs entire green, yellow, and red fluorescences prepared separately on alkaline, neutral, and acidic aqueous solutions possess similar graphite structures in their carbon cores, while the diversification of PL emissions in these CDs are convinced to derive from the difference in their particle size and the content of nitrogen doping. Moreover, the regular variation of calculated band gaps for the three types of CDs are perfectly consistent with their PL emission characteristics. Further investigation of their radical scavenging activities based on the difference in surface states demonstrates that the CDs synthesized under alkaline conditions have stronger oxidation resistance. Thus, we can speculate that the amino groups on P-phenylenediamine precursors are more easily activated under acidic conditions, which results in an in-depth cross-linking that facilitates a long wavelength emission. In addition, the exceptional biocompatibility of these multicolored CDs enables tremendous potential applications in biological systems.