Study on the Ultrahigh Quantum Yield of Fluorescent P,O-g-C3N4 Nanodots and its Application in Cell Imaging

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• 作者：Dr. Mingcong Rong ; Dr. Zhixiong Cai ; Dr. Lei Xie ; Dr. Chunshui Lin ; Dr. Xinhong Song ; Dr. Feng Luo ; Dr. Yiru Wang and Prof. Xi Chen
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：June 27, 2016
• 年：2016
• 卷：22
• 期：27
• 页码：9387-9395
• 全文大小：4652K
• ISSN：1521-3765

文摘

Graphitic carbon nitride nanodots (g-C₃N₄ nanodots), as a new kind of heavy-metal-free quantum dots, have attracted considerable attention because of their unique physical and chemical properties. Although various methods to obtain g-C₃N₄ nanodots have been reported, it is still a challenge to synthesize g-C₃N₄ nanodots with ultrahigh fluorescence quantum yield (QY). In this study, highly fluorescent phosphorus/oxygen-doped graphitic carbon nitride (P,O-g-C₃N₄) nanodots were prepared by chemical oxidation and hydrothermal etching of bulk P-g-C₃N₄ derived from the pyrolysis of phytic acid and melamine. The as-prepared P,O-g-C₃N₄ nanodots showed strong blue fluorescence and a relatively high QY of up to 90.2 %, which can be ascribed to intrinsic phosphorus/oxygen-containing groups, and surface-oxidation-related fluorescence enhancement. In addition, the P,O-g-C₃N₄ nanodots were explored for cell imaging with excellent stability and biocompatibility, which suggest that they have great potential in biological applications.