State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14424, Potsdam, Germany.
Angew Chem Int Ed Engl. 2016 Mar 7;55(11):3672-6. doi: 10.1002/anie.201511217. Epub 2016 Feb 16.
A novel type of quantum dot (Ph-CN) is manufactured from graphitic carbon nitride by "lining" the carbon nitride structure with phenyl groups through supramolecular preorganization. This approach requires no chemical etching or hydrothermal treatments like other competing nanoparticle syntheses and is easy and safe to use. The Ph-CN nanoparticles exhibit bright, tunable fluorescence, with a high quantum yield of 48.4 % in aqueous colloidal suspensions. Interestingly, the observed Stokes shift of approximately 200 nm is higher than the maximum values reported for carbon nitride based fluorophores. The high quantum yield and the large Stokes shift are related to the structural surface organization of the phenyl groups, which affects the π-electron delocalization in the conjugated carbon nitride networks and induces colloidal stability. The remarkable performance of the Ph-CN nanoparticles in imaging is demonstrated by a simple incubation study with HeLa cells.
一种新型的量子点（Ph-CN）是通过超分子预组织将苯基团“排列”在石墨相氮化碳结构上来制造的。与其他竞争的纳米粒子合成方法不同，这种方法不需要化学蚀刻或水热处理，使用起来简单、安全。Ph-CN 纳米粒子表现出明亮、可调谐的荧光，在水胶体悬浮液中的量子产率高达 48.4%。有趣的是，观察到的斯托克斯位移约为 200nm，高于基于氮化碳的荧光团的最大值。高量子产率和大斯托克斯位移与苯基团的结构表面组织有关，这影响了共轭碳氮化网络中的π电子离域，并诱导了胶体稳定性。Ph-CN 纳米粒子在 HeLa 细胞的简单孵育研究中表现出了显著的成像性能。
