Carbon dots derived from frankincense soot for ratiometric and colorimetric detection of lead (II)

Abstract We report a simple one-pot hydrothermal synthesis of carbon dots from frankincense soot. Carbon dots prepared from frankincense (FI-CDs) have narrow size distribution with an average size of 1.80 nm. FI-CDs emit intense blue fluorescence without additional surface functionalization or modif...

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Bibliographic Details
Published in:Nanotechnology 2022-12, Vol.33 (49), p.495706
Main Authors: Lisa John, Varsha, P M, Fasila, K P, Chaithra, T P, Vinod
Format: Article
Language:English
Subjects:
carbon dots
detection of lead
frankincense soot
photoluminescence
TD-DFT
UV light LED chip
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Summary:Abstract We report a simple one-pot hydrothermal synthesis of carbon dots from frankincense soot. Carbon dots prepared from frankincense (FI-CDs) have narrow size distribution with an average size of 1.80 nm. FI-CDs emit intense blue fluorescence without additional surface functionalization or modification. A negative surface charge was observed for FI-CDs, indicating the abundance of epoxy, carboxylic acid, and hydroxyl functionalities that accounts for their stability. A theoretical investigation of the FI-CDs attached to oxygen-rich functional groups is incorporated in this study. The characteristics of FI-CDs signify arm-chair orientation, which is confirmed by comparing the indirect bandgap of FI-CDs with the bandgap obtained from Tauc plots. Also, we demonstrate that the FI-CDs are promising fluoroprobes for the ratiometric detection of Pb 2+ ions (detection limit of 0.12 μ M). The addition of Pb 2+ to FI-CD solution quenched the fluorescence intensity, which is observable under illumination by UV light LED chips. We demonstrate a smartphone-assisted quantification of the fluorescence intensity change providing an efficient strategy for the colorimetric sensing of Pb 2+ in real-life samples.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/ac8e76