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.

ProbeDetected ionLinear rangeLOD (nM)SelectivityRef

Ag NCsCu2+10With no selectivity over ions even with the help of EDTA[38]
Hg2+0∼100 nM5
Au-Ag NCsCu2+0.5 nM∼2.5 μM0.3Selective determination of Hg2+ by masking Cu2+ with EDTA[39]
Hg2+0.2 nM∼2.5 μM0.1
Ag NCsCu2+0.1 nM∼20 μM28Masking Hg2+ with thymine and masking Cu2+ with potassium pyrophosphate[40]
Hg2+0.1 nM∼10 μM35
Ag NCsCu2+0∼1 μM2.8Masking Cu2+ with EDTA for selective determination of Hg2+[41]
Hg2+0.01∼0.5 μM1.0
Ag NCsFe3+0.5 μM∼20 μM0.12[42]
Au NCs and Au/Ag NCsFe3+5 μM∼1 mM1.11Masking Fe3+ with EDTA for selective determination of Hg2+[34]
Hg2+5 nM∼5 μM1.56
Ag NCsCu2+1 pM∼1 mM0.6Switching the selectivity by controlling solution pH (pH = 4.3 for Cu2+ determination and pH = 7 for Fe3+ determination)This work
Fe3+100∼1000 μM9.8