Journal
OPTICAL MATERIALS
Volume 121, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2021.111543
Keywords
Carbon dots; Heteroatoms doping; Red excitation and emission; Detection
Categories
Funding
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC201906]
- Natural Scientific Foundation of China [51473082]
- State Key Project of International Cooperation Research [2017YFE0108300, 2016YFE0110800]
- Shandong Double-Hundred Project (2018)
- National Plan for Introducing Talents of Discipline to Universities (111 plan)
- 1st Class Discipline Program of Shandong Province of China
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Novel R-CDs with strong red emission were successfully synthesized and utilized as a selective and sensitive turn-off sensor for Sn2+ detection. The R-CDs demonstrated effective electron, charge or energy transfer between excitons and Sn2+ through non-radiative recombination, enabling detection with a high range and low limit.
Carbon dots with both red-emission and red-excitation (R-CDs) have attracted much attention due to their excellent optical property and promising application in various fields. However, most carbon dots (CDs) with redemission are only excited with short wavelength irradiation, which heavily hinders their further applications. Herein, novel R-CDs are obtained through a hydrothermal synthesis by using p-phenylenediamine and ammonium thiocyanate as precursors. The as-synthesized R-CDs exhibit a strong red emission at 618 nm at a long excitation (598 nm). Moreover, the R-CDs are explored as a selective and sensitive turn-off sensor for Sn2+ detection by the non-radiative recombination of the excitons through effective electron, charge or energy transfer between Sn2+ and surface functional groups such as hydroxyl, carbonyl, amine, thiophene, and S=O, with a detection range from 0 to 90 mu M and a detection limit of as low as 17.25 nM.
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