Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 233, Issue -, Pages 25-30Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.04.026
Keywords
Ag-In-Zn-S quantum dots; Fluorescence; Graphene oxide; Copper(II) detection
Funding
- Natural Science Foundation of China [61475028, 61475029, 61575190]
- Chongqing Outstanding Youth Project [cstc2014jcyjjq40002]
- Natural Science Foundation of Chongqing [cstc2013jcyjA40029]
- Fundamental Research Funds for the Central Universities [106112015CDJXY120010]
- National Natural Science Foundation of China [61520106012]
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A selective copper(II) sensor based on graphene oxide (GO) modified Ag-In-Zn-S (AIZS) quantum dots (QDs) was proposed. The fluorescence of the water-soluble AIZS QDs was quenched after addition of Cu2+ ion, which was triggered by the aggregation of the QDs in the form of R-000-(Cu2(+))-OOC-R, as verified by the TEM and FTIR. The fluorescence probe can be applied to detect Cu2+ ion in a wide concentration range of 0-850 mu M based on the degree of fluorescence quenching, with its limitation of detection (LOD) and R-2 of 0.18 mu M and 0.99, respectively. Moreover, the nanosensor can distinguish Cu2+ ion from other ions, offering great potentials in copper(II) determination in drinking water. (C) 2016 Elsevier B.V. All rights reserved.
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