Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 243, Issue -, Pages 1002-1009Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.12.079
Keywords
TNT detection; Carbon quantum dots; Photo-induced electron transfer; Detection limit
Funding
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [41521001]
- National Natural Science Foundation of China [51371162]
- Fundamental Research Funds for the Central Universities
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Nowadays, selective, sensitive and visual detection of 2,4,6-trinitrotoluene (TNT) explosives residues in groundwater system has been a great challenge for human security. Herein, a visual fluorescence paper sensor for accurate and on-site detection of TNT in groundwater system by linking the recognition molecule onto the surface of the carbon quantum dots (CDs) was introduced. The fluorescence of CDs based nanosensor can be selectively and efficiently quenched by TNT through a photo-induced electron transfer effect between primary amino groups and TNT explosives. The fluorescence quantum yield of this kind of nanosensor is up to 32.25% and the detection limit reaches as low as 0.213 mu mol/L. The interference molecules, such as the nitrobenzene derivatives have no influence on the sensitive detection of TNT. Furthermore, the paper sensor based on the CDs probe has been prepared, which can efficiently detect TNT residues in groundwater system. This developed nanosensor possesses the great capability of on-site and visual detection of TNT residues in groundwater without any further processing step. (C) 2016 Elsevier B.V. All rights reserved.
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