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Silver nanoplates as novel optical sensors for Cu~(2+) detection have been demonstrated.Silver nanoplates are synthesized via previous H_2O_2-NaBH_4 cyclic oxidation-reduction reactions.With introduction of ascorbate as mild reductants,Cu~(2+) ions are reduced into Cu~+ and the Cu~+ is further reduced to Cu,which is deposited on the surface of the silver nanoplates.The deposition of the Cu on the surface of the silver nanoplates allows a significant red-shift of their plasmon absorption.Therefore,trace Cu~(2+) can be detected.The shift of the plasmon absorption wavelength of silver nanoplates is proportional to the Cu~(2+)concentration over a range of 40-340 μmol L~(-1) with a limit of detection of 9.0 μmol L~(-1).Moreover,such silver nanoplate-based optical sensors provide good selectivity for Cu~(2+) detection,and most other metal ions do not disturb its detection.Moreover,the practicality of the proposed sensor was tested.This Cu~(2+)assay is advantageous in its simplicity,selectivity,and cost-effectiveness.
Silver nanoplates as novel optical sensors for Cu ~ (2+) detection have been demonstrated. Silver nanoplates are filled via previous H_2O_2-NaBH_4 cyclic oxidation-reduction reactions.With introduction of ascorbate as mild reductants, Cu 2+ ions are reduced into Cu ~ + and the Cu ~ + is further reduced to Cu, which is deposited on the surface of the silver nanoplates. The deposition of the Cu on the surface of the silver nanoplates allows a significant red-shift of their plasmon absorption. Beforefore , trace Cu ~ (2+) can be detected. The shift of the plasmon absorption wavelength of silver nanoplates is proportional to the Cu ~ (2+) concentration over a range of 40-340 μmol L ~ (-1) with a limit of detection of 9.0 μmol L -1. Moreover, such as silver nanoplate-based optical sensors provide good selectivity for Cu 2+ detection, and most other metal ions do not disturb its detection. More over, the practicality of the proposed sensor was tested. This Cu 2+ assay is advantageous in its simplicity, selecti vity, and cost-effectiveness.