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Indexed by:期刊论文
Date of Publication:2014-05-01
Journal:CARBON
Included Journals:SCIE、EI、Scopus
Volume:71
Page Number:87-93
ISSN No.:0008-6223
Abstract:Photoluminescent carbon dots (C-dots) were prepared directly by a simple hydrothermal treatment using polyethylene glycol with different molar weight (400-6000 g mol(-1)) as the sole carbon source. The synthesized C-dots with tunable diameters of 2-4 nm exhibit excitation-dependent photoluminescent behavior. In contrast to previous methods, neither strong acid treatment nor further surface modification is necessary for this one-step process. The C-dots with well-defined surface chemistry and properties were well-dispersed in aqueous media and showed high photostability indicating they are suitable for use in different pH and NaCl aqueous solutions. The C-dots possessed low cytotoxicity, good photostability and can enter the cancer cells, making them suitable candidates for two-photon cellular imaging and labelling. (C) 2014 Elsevier Ltd. All rights reserved.
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