Issue 7, 2020

A facile synthesis of two ionized fluorescent carbon dots and selective detection toward Fe2+ and Cu2+

Abstract

In this study, a facile synthesis of two ionized carbon dots (CDs-2 and CDs-3) is reported, in which different ionic pairs are formed at the surface of the carbon core. In contrast to CDs-3, the accumulation of carbon core can be clearly observed in the TEM image of CDs-2. This is due to the linkage of the dibromine alkyl group. Compared with naked CDs in the absence of the ionic pair, the maximum emission wavelength undergoes a red-shift of nearly 60 nm. Moreover, protic solvents (water, ethanol and N,N′-dimethyl formamide) have an apparent effect on the emission intensities of CDs-2 and CDs-3. The time-resolved average lifetimes of CDs-2 and CDs-3 are calculated as 56.34 ns and 54.50 ns, respectively. Furthermore, they both have much better fluorescence stability in the solution with pH ranging from 2 to 11 due to the presence of the imidazolium cation. It is interesting to see that CDs-2 and CDs-3 have much different responses towards Cu2+ and Fe2+. The CDs-3 solution generates clear fluorescence quenching when treated with Fe2+. In brief, we believe that these findings can inspire more research developments in the synthesis and further application of functional CDs.

Graphical abstract: A facile synthesis of two ionized fluorescent carbon dots and selective detection toward Fe2+ and Cu2+

Supplementary files

Article information

Article type
Paper
Submitted
23 Feb 2020
Accepted
18 May 2020
First published
19 May 2020
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2020,2, 2943-2949

A facile synthesis of two ionized fluorescent carbon dots and selective detection toward Fe2+ and Cu2+

L. Gao, D. Wu, W. Tan, F. Pan, J. Xu, Y. Tao and Y. Kong, Nanoscale Adv., 2020, 2, 2943 DOI: 10.1039/D0NA00151A

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