Research Article
Green Synthesis of Fluorescent Ag Nanoclusters for Detecting Cu2+ Ions and Its “Switch-On” Sensing Application for GSH
Table 2
Comparison of Ag NCs probe for the detection of Cu2+ and Fe3+ with previously reported fluorescent-based probes in aqueous solution.
| Probe | Detected ion | Linear range | LOD (nM) | Selectivity | Ref |
| Ag NCs | Cu2+ | — | 10 | With no selectivity over ions even with the help of EDTA | [38] | Hg2+ | 0∼100 nM | 5 | Au-Ag NCs | Cu2+ | 0.5 nM∼2.5 μM | 0.3 | Selective determination of Hg2+ by masking Cu2+ with EDTA | [39] | Hg2+ | 0.2 nM∼2.5 μM | 0.1 | Ag NCs | Cu2+ | 0.1 nM∼20 μM | 28 | Masking Hg2+ with thymine and masking Cu2+ with potassium pyrophosphate | [40] | Hg2+ | 0.1 nM∼10 μM | 35 | Ag NCs | Cu2+ | 0∼1 μM | 2.8 | Masking Cu2+ with EDTA for selective determination of Hg2+ | [41] | Hg2+ | 0.01∼0.5 μM | 1.0 | Ag NCs | Fe3+ | 0.5 μM∼20 μM | 0.12 | — | [42] | Au NCs and Au/Ag NCs | Fe3+ | 5 μM∼1 mM | 1.11 | Masking Fe3+ with EDTA for selective determination of Hg2+ | [34] | Hg2+ | 5 nM∼5 μM | 1.56 | Ag NCs | Cu2+ | 1 pM∼1 mM | 0.6 | Switching the selectivity by controlling solution pH (pH = 4.3 for Cu2+ determination and pH = 7 for Fe3+ determination) | This work | Fe3+ | 100∼1000 μM | 9.8 |
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