Journal
CHEMICAL ENGINEERING JOURNAL
Volume 309, Issue -, Pages 374-380Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.10.022
Keywords
Graphene quantum dots; Electron-beam irradiation; Fluorescent probe; Bioimaging
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Funding
- National Natural Science Foundation of China [21671129]
- Shanghai Sailing Program [16YF1404400]
- Science and Technology Commission of Shanghai Municipality [16ZR1412100]
- Program for Chang Pang Scholars and Innovative Research Team in University [IRT13078]
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We report a room-temperature strategy for the synthesis of single-crystalline fluorescent graphene quantum dots (GQDs) via electron-beam irradiation. The precursor contained high-activity nitro groups is easy to fusion GQDs with the method. Under optimized conditions (0.02 g 1,3,6-trinitropyrene, radiation dose of 400 kGy and 10 ml 0.5 mol/L hydrazine hydrate), the GQDs exhibit highly efficient fluorescence at 475 nm with a quantum yield of 32%. The PL maximum is well corresponded with the excitation wavelength. Moreover, the single-exponential fluorescence lifetime (4.86 ns) exhibited the intrinsic PL characteristic. The pH stability in neutral and alkaline solution, solid solubility and storage time stability of GQDs are satisfactory. Their application as a safety fluorescent probe for cell imaging is demonstrated. (C) 2016 Published by Elsevier B.V.
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