期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 255, 期 -, 页码 657-665出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.08.028
关键词
Carbon quantum dots; Gold; Nitrogen; Hg(II); Fluorescence; Probe
资金
- National Natural Science Foundation of China [51672144, 51572137, 51502149, 51272117]
- Natural Science Foundation of Shandong Province [ZR2016EMB25]
- Higher Educational Science and Technology Program of Shandong Province [J16LA10]
- Application Foundation Research Program of Qingdao [15-9-1-28-jch]
- Shandong Province Taishan Scholar engineering
- Overseas Taishan Scholar engineering
Herein, a one-step hydrothermal tactics is developed for the preparing gold and nitrogen co-doped carbon quantum dots by using folic acid, glycerol and chloroauric acid as raw materials. The as-prepared Au/N-CQDs with the average size of 4.01 + 1 nm had both crystalline and amorphous carbon. Au/N-GQDs exhibited the excitation-dependent fluorescence behavior with the maximum excitation and emission at 355 and 450 nm, respectively. Furthermore, Au/N-GQDs were an excellent fluorescent probe for the detection of Hg(II) based on the fluorescence quenching effect, Au/N-CQDs showed high sensitivity for detecting of Hg(II) with a detection limit of 0.118 mu M and the linear relationship ranged from 0 to 41.86 mu M. The results of the selectivity experiments illustrated that the fluorescent probe was particular for Hg(II) and it was not interfered by high concentrations other metal cations and anions. When EDTA-2Na or I- was added, the fluorescence intensity of Au/N-GQDs containing Hg(II) turned on and increased to 90% of the blank sample. More importantly, the fluorescent probe based on Au/N-CQDs was successfully applied to the detection of Hg(II) in real sample. This work not only provides a novel method for the synthesis of Au/N-CQDs, but also provides a promising sensing platform for monitoring of Hg(II) in the environmental application. (C) 2017 Elsevier B.V. All rights reserved.
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