Citation:
Xiao-Dong Xia, Tian-Lun Wang, Xiao-Yuan Yuan. Tuning plasmon absorption of unmodified silver nanoplates for sensitive and selective detection of copper ions by introduction of ascorbate[J]. Chinese Chemical Letters,
;2014, 25(10): 1403-1406.
doi:
10.1016/j.cclet.2014.05.033
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Silver nanoplates as novel optical sensors for Cu2+ detection have been demonstrated. Silver nanoplates are synthesized via previous H2O2-NaBH4 cyclic oxidation-reduction reactions. With introduction of ascorbate as mild reductants, Cu2+ 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 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 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 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.
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