Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 252, Issue -, Pages 1083-1088Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.06.087
Keywords
Phosphorescence; Mn-doped ZnS quantum dots; Silver(I); Pesticide; Fruit peel
Funding
- National Basic Research Program of China [2015CB932002]
- Science and Technology Service Network Initiative of Chinese Academy of China [KFJ-SW-STS-172]
- National Natural Science Foundation of China [21375131, 21675158, 21605144, 21475135]
Ask authors/readers for more resources
Pesticides abuse has drawn considerable attention in agriculture, environment and food safety in recent years. How to selective and on-site detection of pesticide residues with rapid operation and low cost is still a hot topic. In this work, we report a novel method for the detection of pesticide thiram using phosphorescent Mn-doped ZnS quantum dots (ZnS:Mn2+ QDs) combined by an affinity reaction between thiram and Ag+ ions. On the one hand, the phosphorescence of as-prepared ZnS:Mn2+ QDs at 590 nm can be effectively quenched by Ag+ ions due to the direct cation-exchange reaction at the surface of QDs. On the other hand, the presence of thiram can inhibit phosphorescence quenching through the formation of stable Ag-thiram complex. This inhibition resulted in a linear recovery in emission intensity with increasing the amount of thiram, which enables thiram residues to be identified under the UV light illumination. In buffer condition, thiram could be detected within the concentration range of 50 nM-2.5 mu M with a detection limit of 25 nM. Moreover, the proposed method has been successfully applied to thiram residues identification at fresh fruit peels. The investigation provides a profile for instant and visual detection of surface residues using doped quantum dots. (C) 2017 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available