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Ratiometric dual-emission carbon dots coupled with smartphone for visual quantification of Co2+ and EDTA and biological sensing by Xiaorui Dong; Lihong Shi; Wei Zhou; Shaomin Shuang is a Chemistry article available to read on EtoBox.

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Ratiometric fluorescence analysis provides the feasibility for visual quantitative sensing by presenting continuous color changes. Herein, dual-emission carbon dots (D-CDs) have been developed for ratiometric recognition of Co 2+ and EDTA, along with successive fluorescence variation of yellow, purplish-pink, purple, light blue, and dark blue. D-CDs have been synthesized by microwave-assisted heating of tetracycline and manifest dual emissions at 562 nm and 610 nm under 450 nm excitation. Intriguingly, the emissions at 562 nm and 610 nm are quenched while a ratio rising emission emerges at 482 nm upon introducing Co 2+ , which displays ratiometric fluorescence emission characteristics (I 482 /I 562 ) in the range of 0.25-400 μM with significant fluorescence varying from yellow, purplish-pink, purple, light blue, to dark blue. Subsequent addition of EDTA could ratiometric recover the fluorescence of D-CDs in the range of 50-130 μM with the fluorescence returning from dark blue, light blue, purple, purplish-pink, to yellow. More crucially, integrating continuous color changes and color recognizer APP in the smartphone, visual quantification of Co 2+ and EDTA can be realized based on

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Author

Xiaorui Dong; Lihong Shi; Wei Zhou; Shaomin Shuang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)