Abstract
We have reported lysozyme induced water soluble tiny gold nanoclusters (AuNCs) having good stability and highly fluorescent nature for the detection of Hg2+ ions. Gold nanoclusters prepared by such green method are highly demandable because of their biocompatibility nature and tunable optical behavior. We observed that the AuNCs are efficient towards detection of Hg2+ ions in aqueous solution against different valent ions in the range of 5-100 µM. Although little fluorescence emission intensity decreases for other ions too but this is maximum for Hg2+ ions in aqueous medium, i.e., fluorescence quenching is maximum for Hg2+ ions. Interaction nature between the AuNCs and Hg2+ ions have identified from the steady-state fluorescence, Stern-Volmer plot and thermodynamical analysis. We proposed two-step interaction mechanism between the AuNCs and the dissolved Hg2+ ions, where a non-covalent metallophilic Au+- Hg2+ interaction plays a crucial role.
Published Version
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