Abstract
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-COO-(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 0–850μM based on the degree of fluorescence quenching, with its limitation of detection (LOD) and R2 of 0.18μM and 0.99, respectively. Moreover, the nanosensor can distinguish Cu2+ ion from other ions, offering great potentials in copper(II) determination in drinking water.
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