期刊
NANOTECHNOLOGY
卷 27, 期 39, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0957-4484/27/39/395706
关键词
solid-phase microwave method; nitrogen doped carbon dots; Fe3+ detection; cellular bioimaging
资金
- National Natural Science Foundation of China [61574091, 51402190]
- Program of Shanghai Academic/Technology Research Leader [15XD1525200]
- Shanghai Science and Technology Grant [16JC1402000, 13ZR1429300]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
Recently, carbon dots (CDs) have been playing an increasingly important role in industrial production and biomedical field because of their excellent properties. As such, finding an efficient method to quickly synthesize a large scale of relatively high purity CDs is of great interest. Herein, a facile and novel microwave method has been applied to prepare nitrogen doped CDs (N-doped CDs) within 8 min using L-glutamic acid as the sole reaction precursor in the solid phase condition. The as-prepared N-doped CDs with an average size of 1.64 nm are well dispersed in aqueous solution. The photoluminescence of N-doped CDs is pH-sensitive and excitation-dependent. The N-doped CDs show a strong blue fluorescence with relatively high fluorescent quantum yield of 41.2%, which remains stable even under high ionic strength. Since the surface is rich in oxygen-containing functional groups, N-doped CDs can be applied to selectively detect Fe3+ with the limit of detection of 10(-5) M. In addition, they are also used for cellular bioimaging because of their high fluorescent intensity and nearly zero cytotoxicity. The solid-phase microwave method seems to be an effective strategy to rapidly obtain high quality N-doped CDs and expands their applications in ion detection and cellular bioimaging.
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