Abstract:
A highly selective and sensitive colorimetric nanosensor driven by Cu2þ ion for iodide (I–
) ion was
developed using citrate-capped AgNPs. This assay relied upon the distance-dependent optical properties
of AgNPs where Cu2þ was employed as interlinking agent. In the simultaneous presence of I and Cu2þ,
the system showed a color change from yellow to colorless that could be monitored using naked-eyes
and UV–vis spectrophotometer. The nanosensor exhibited good iodide sensitivity with a detection limit
of 0.24 μM. Further, the nanosystem was developed as an AND type logic gate with the inputs of Cu2þ
and I.
