Journal
JOURNAL OF MATERIALS RESEARCH
Volume 30, Issue 22, Pages 3386-3393Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2015.323
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Funding
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry
- National Natural Science Foundation of China [21201159, 61176016, 21104075]
- Hundred Talent Program of CAS
- Innovation and Entrepreneurship Program of Jilin
- CIAC start-up fund
- U.S. DOE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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Carbon nanodots (CDs) have generated enormous excitement because of their superiority in water solubility, chemical inertness, low toxicity, ease of functionalization and resistance to photo-bleaching. Here we report a facile thermal pyrolysis route to prepare CDs with high quantum yield (QY) using citric acid as the carbon source and ethylene diamine derivatives (EDAs) including triethylenetetramine (TETA), tetraethylenepentamine (TEPA) and polyene polyamine (PEPA) as the passivation agents. We find that the CDs prepared from EDAs, such as TETA, TEPA and PEPA, show relatively high photoluminescence (PL) QY (11.4, 10.6, and 9.8%, respectively) at lambda(ex) of 465 nm. The cytotoxicity of the CDs has been investigated through in vitro and in vivo bio-imaging studies. The results indicate that these CDs possess low toxicity and good biocompatibility. The unique properties such as the high PL QY at large excitation wave length and the low toxicity of the resulting CDs make them promising fluorescent nanoprobes for applications in optical bio-imaging and biosensing.
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