Hydrophobic carbon dots with blue dispersed emission and red aggregation-induced emission
Hydrophobic carbon dots with blue dispersed emission and red aggregation-induced emission
复制标题
具有蓝色分散发射和红色聚集诱导发射的疏水碳点
DOI：
10.1038/s41467-019-09830-6
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发表时间：
2019-04-17
影响因子：
16.6
通讯作者：
Hu, Chaofan
中科院分区：
文献类型：
--
作者：
Yang, Haiyao;Liu, Yingliang;Hu, Chaofan
碳量子点（CD）作为最有前途的荧光纳米材料之一已经被研究了多年。然而，具有红色或固态荧光的CD很少报道。本文中，通过一锅溶剂热处理，获得具有蓝色分散发射和红色聚集诱导发射的疏水CD（H-CD）。当引入水时，疏水相互作用导致H-CD的聚集。H-CD团簇的形成导致蓝光发射的关闭，因为H-CD核心遭受π-π堆积相互作用，并且由于限制了表面围绕二硫键的分子内旋转而导致红光发射的开启，这符合聚集诱导发射现象。当H-CD粉末完全溶解时，H-CD的这种开关荧光是可逆的。此外，分散在滤纸中的H-CD溶液几乎无色。最后，我们研制了一种可逆双开关发光油墨，用于高级防伪和双重加密。
Carbon dots (CDs) have been studied for years as one of the most promising fluorescent nanomaterials. However, CDs with red or solid-state fluorescence are rarely reported. Herein, through a one-pot solvothermal treatment, hydrophobic CDs (H-CDs) with blue dispersed emission and red aggregation-induced emission are obtained. When water is introduced, the hydrophobic interaction leads to aggregation of the H-CDs. The formation of H-CD clusters induces the turning off of the blue emission, as the carbonized cores suffer from π-π stacking interactions, and the turning on of the red fluorescence, due to restriction of the surfaces’ intramolecular rotation around disulfide bonds, which conforms to the aggregation-induced-emission phenomenon. This on-off fluorescence of the H-CDs is reversible when the H-CD powder is completely dissolved. Moreover, the H-CD solution dispersed in filter paper is nearly colorless. Finally, we develop a reversible two switch-mode luminescence ink for advanced anti-counterfeiting and dual-encryption.