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 Cu2+ can be
detected. The shift of the plasmon absorption wavelength of silver nanoplates is proportional to the Cu2+
concentration over a range of 40–340 mmol L1 with a limit of detection of 9.0 mmol L1. Moreover, such
silver nanoplate-based optical sensors provide good selectivity for Cu2+ detection, and most other metal
ions do not disturb its detection. Moreover, the practicality of the proposed sensor was tested. This Cu2+
assay is advantageous in its simplicity, selectivity, and cost-effectiveness
which is deposited on the surface of the silver nanoplates. The deposition of the Cu on the surface of the silvernanoplates allows a significant red-shift of their plasmon absorption. Therefore, trace Cu2+ can bedetected. The shift of the plasmon absorption wavelength of silver nanoplates is proportional to the Cu2+concentration over a range of 40–340 mmol L1 with a limit of detection of 9.0 mmol L1. Moreover, suchsilver nanoplate-based optical sensors provide good selectivity for Cu2+ detection, and most other metalions do not disturb its detection. Moreover, the practicality of the proposed sensor was tested. This Cu2+assay is advantageous in its simplicity, selectivity, and cost-effectiveness
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