Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 3, Issue 4, Pages 514-522Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5qi00273g
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Funding
- National Natural Science Foundation of China [51503085, 51432006]
- Ministry of Science and Technology of China for the International Science Linkages Program [2011DFG52970]
- Natural Science Foundation of Jiangsu Province, China [BK20140157]
- Changjiang Innovation Research Team [IRT14R23]
- Programme of Introducing Talents of Discipline to Universities (111 Project) [B13025]
- Fundamental Research Funds for the Central Universities [JUSRP11418]
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In this paper, a novel turn-on chemosensor for detecting temperature and Fe3+ has been designed. This nanosensor is based on the aggregation-induced emission enhancement (AIEE) properties of fluorescent carbon dots (CDs). The CDs prepared by a facile hydrothermal route show blue emission (lambda(em) = 505 nm) with a quantum yield of 4.7%. The resultant CDs are modified by glutathione (GSH) on the surface through the carbodiimide-activated coupling reaction. The as-prepared GSH-CDs show good dispersion, high fluorescence and AIEE phenomenon. Resultant GSH-CDs would be aggregated by Fe3+ ions in aqueous solution which results in enhanced fluorescence. Therefore, such GSH-CDs would be excellent candidates as fluorescent probes for the label-free detection of Fe3+ ions with a limit of detection of 0.1 mu M. Moreover, the PL intensity of GSH-CDs increases progressively with increasing temperature and they could be used in optical thermometry over a wide temperature range (25-80 degrees C) with small temperature resolution (similar to 0.5 degrees C). Using MC3T3-E1 cells as the model, the resultant nanosensor is demonstrated to monitor temperature and Fe3+ ions in cells. Thus, resultant GSH-CDs could be used as a turn-on sensor for highly sensitive and selective detection of temperature and Fe3+ ions in aqueous solution and biosystems.
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