Citation: Jingjing Qian, Nana Cao, Jian Zhang, Jinjin Hou, Qian Chen, Cheng Zhang, Yudie Sun, Shengjun Liu, Lifang He, Kui Zhang, Haibo Zhou. Field-portable ratiometric fluorescence imaging of dual-color label-free carbon dots for uranyl ions detection with cellphone-based optical platform[J]. Chinese Chemical Letters, ;2020, 31(11): 2925-2928. doi: 10.1016/j.cclet.2020.05.004 shu

Field-portable ratiometric fluorescence imaging of dual-color label-free carbon dots for uranyl ions detection with cellphone-based optical platform

Jingjing Qian ^a ,
Nana Cao ^b ,
Jian Zhang ^{a, b, *,} ,
Jinjin Hou ^b ,
Qian Chen ^b ,
Cheng Zhang ^b ,
Yudie Sun ^b ,
Shengjun Liu ^b ,
Lifang He ^b ,
Kui Zhang ^{b, *,} ,
Haibo Zhou ^{c, d, **,}

a.
Department of Applied Chemistry, Anhui Agricultural of University, Hefei 230036, China
b.
School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 243032, China
c.
Institute of Pharmaceutical Analysis, College of Pharmacy, Jinan University, Guangzhou 510632, China
d.
Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, Shenzhen 518020, China

^**

ahutjz@tech.ahut.edu.cn

zhangkui@mail.ustc.edu.cn

haibo.zhou@jnu.edu.cn

Received Date: 21 March 2020
Revised Date: 30 April 2020
Accepted Date: 4 May 2020
Available Online: 14 May 2020

Figures(4)

Under the public spotlight, uranyl (UO₂²⁺) ions has attracted considerable attention for the extreme radioactive and chemical toxicity to ourselves and our environment. Herein, we present a simple and effective ratiometric fluorescence imaging method for the visualizing and quantitative detection UO₂²⁺ ions by cellphone-based optical platform. The sensing solution was prepared by mixing label-free red carbon dots (r-CDs) and blue carbon dots (b-CDs) together with a fixed photoluminescence intensity ratio of 4:1. When UO₂²⁺ ions were added, the fluorescence of r-CDs can be selectively quenched, while the fluorescence of b-CDs remains stable without spectral changes. With the gradually increase the amounts of UO₂²⁺ ions, the different response of dual-color CDs resulted in a signification color evolution from deep red to dark purple under the ultraviolet (UV) light illumination. Then, a cellphone-based optical platform was constructed for directly imaging the color change of the samples, and the built-in Colorpicker APP quickly output the red, green and blue (RGB) channel values of these images within one second. Interesting, there was a linear relationship between the ratio of red and blue (R/B) channel values and UO₂²⁺ ions concentration from 0 μmol/L to 30.0 μmol/L (R² = 0.92804) with the detection limit of ~8.15 μmol/L (signal-to-noise ratio of 3). In addition, the optical platform has also been applied to the quantification of UO₂²⁺ ions in tap water and river water sample. With the advantage of low-cost, portable, easy to operation, we anticipate that this method would greatly improve the accessibility of UO₂²⁺ ions detection even in resource-limited areas.
- Uranyl ions,
- Carbon dots,
- Ratiometric fluorescence,
- Field-portable,
- Cellphone
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