Cu2+ enhanced chemiluminescence of carbon dots-H2O2 system in alkaline solution

Qiuju Zhu; Guoyong Liu; Mengxia Yan; Jing Ye; Liping Zhu; Jianshe Huang; Xiurong Yang

doi:10.1016/j.talanta.2019.120380

Cu²⁺ enhanced chemiluminescence of carbon dots-H₂O₂ system in alkaline solution

Talanta. 2020 Feb 1:208:120380. doi: 10.1016/j.talanta.2019.120380. Epub 2019 Sep 19.

Authors

Qiuju Zhu¹, Guoyong Liu¹, Mengxia Yan¹, Jing Ye¹, Liping Zhu¹, Jianshe Huang², Xiurong Yang³

Affiliations

¹ Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, China; State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China.
² State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China.
³ Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, China; State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China. Electronic address: xryang@ciac.ac.cn.

PMID: 31816789
DOI: 10.1016/j.talanta.2019.120380

Abstract

Herein, Chemiluminescence (CL) behaviour of carbon dots (CDs) was investigated by using H₂O₂ as co-reactant in alkaline solution. The study demonstrated O₂^-, OH and ¹O₂ involved in the CL reaction processes. These reactive oxygen species reacted with CDs to produce CD^•+ and CD^•-, then the CD^•+ reacted with CD^•-to generate energy release in the form of CL emission. Importantly, we found that Cu²⁺ ion could greatly enhanced CL intensity (7.5 times) of CDs-H₂O₂ system, which was ascribed to Cu²⁺-catalysed H₂O₂ decomposition. Based on this system, the CL assay of ascorbic acid (AA) was developed. The limit of detection was as low as 0.03 μM, and the linear range was from 0.1 μM to 100 μM. The proposed method has been successfully utilized to determinate AA in beverage samples with satisfactory results.

Keywords: Ascorbic acid; Carbon dots; Chemiluminescence; Cu(2+).