期刊
LANGMUIR
卷 33, 期 44, 页码 12635-12642出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.7b02385
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资金
- Fundamental Research Funds for the Central Universities [2017QNA08]
- National Natural Science Foundation of China [21771039]
- Shanghai Science and Technology Committee [16DZ2270100]
- China Postdoctoral Science Foundation [2016M601907]
Carbon dots (CDs) are a new class of photoluminescent (PL), biocompatible, environment-friendly, and low-cost carbon nanomaterials. Synthesis of highly efficient red-emitting carbon dots (R-CDs) on a gram scale is a great challenge at present, which heavily restricts the wide applications of CDs in the bioimaging field. Herein, R-CDs with a high quantum yield (QY) of 53% are produced on a gram scale by heating a formamide solution of citric acid and ethylenediamine. The as-prepared R-CDs have an average size of 4.1 nm and a nitrogen content of about 30%, with an excitation-independent emission at 627 nm. After detailed characterizations, such strong red fluorescence is ascribed to the contribution from the nitrogen- and oxygen related surface states and the nitrogen-derived structures in the R-CD cores. Our R-CDs show good photostability and low cytotoxicity, and thus they are excellent red fluorescence probes for bioimaging both in vitro and in vivo.
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