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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-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...
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