Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 373, Issue -, Pages 28-36Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2018.12.028
Keywords
Carbon dots(C-dots); Groundnut; Cr(VI) sensing; Humic acid; Glutathione; Bioimaging
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Funding
- Science and Engineering Research Board (SERB)
- Department of Science and Technology (DST) New Delhi, India [SB/FT/CS-109/2012]
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The emergence of fluorescent carbon dots (C-dots) has received special attention due to their distinct characteristics which are advantageous for optical sensing and bioimaging applications. Cr(VI) is considered a hazardous environmental pollutant hence requires a simple and effective method for its detection and recovery. Herein, we have synthesized both C-dots and N-doped C-dots from ground nuts employing a cost-effective and green hydrothermal method. N-C-dots exhibits a remarkably enhanced quantum yield (17.6%) as compared to undoped C-dots (7.8%). In addition,the N-C-dots showed amazing selectivity towards Cr(VI) in the metal sensing application. Cr (VI) induced quenching of fluorescence was recovered using Humic acid as well as Glutathione thus exhibiting an off-on type sensing mechanism. The limit of detection (LOD) for Cr(VI) using N-C-dots was found to be 0.1 mg/L. C-dots possess comparatively low cytotoxicity than N-C-dots at higher concentration thereby making them an efficient candidate for bioimaging of MCF-7 cells.
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