A reusable P, N-doped carbon quantum dot fluorescent sensor for cobalt ion

作者：Liao, Sen; Zhu, Fawei; Zhao, Xinyi; Yang, Hua^*; Chen, Xiaoqing^*

来源：Sensors and Actuators B: Chemical , 2018, 260: 156-164.

DOI：10.1016/j.snb.2017.12.206

• Carbon quantum dot
• Fluorescent probe
• Cobalt ions
• Reusable
• Bioimaging

In this work, phosphorus, nitrogen co-doped carbon quantum dots (P, N-CQDs) as highly selective fluorescent probe for cobalt ion (Co2+) detection were designed and synthesized via a one-step hydrothermal protocol by employing pyridoxal 5-phosphate and ethanediamine. This probe enables selective detection of Co2+ with a linear range of 0-60 mu M and a limit of detection of 0.053 mu M through variation in fluorescence with respect to target concentration and electron-transfer from P, N-CQDs to Co2+. Furthermore, ethylenediaminetetraacetic acid-modified Fe3O4@SiO2 (Fe3O4@SiO2-EDTA) was tailor-designed and prepared to successfully realize the recovery of P, N-CQDs/Co2+ fluorescence for the first time. The reusable P, N-CQDs as fluorescent sensors for Co2+ also show good linearity and sensitivity. Ultimately, this fluorescent probe was applied in the analysis of real river water samples.

• 出版日期2018-5-1
• 单位中南大学