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A complex of GQDs with Ce6 internalized into tumor tissue through FRET; Ce6 was released from the complex (a); a schematic presentation of the GQDs-SS-Ce6 complex (b). Reprinted with permission from ACS Applied Materials and Interfaces 8, by Dou Du, Kun Wang, Ya Wen, Yan Li, and Yong Y. Li, Photodynamic Graphene Quantum Dot: Reduction Condition Regulated Photoactivity and Size Dependent Efficacy, 3287 [228]. Copyright 2016 with permission from the American Chemical Society.
