Luminescent Sub-nanometer Clusters for Metal Ion Sensing: A New Direction in Nanosensors
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submitted by GilbSulli 4 months ago
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We describe the application of a recently discovered family of materials called quantum clusters, which are sub-nanometer particles composed of a few atoms with well-defined molecular formulae, exhibiting intense absorption and emission in the visible region in metal ion sensing, taking Ag25as an example. The changes in the optical properties of the cluster, in both absorption and emission upon exposure to various metal ions in aqueous medium are explored. The cluster can detect Hgdown to ppb levels. It can also detect 5d block ions (Pt, Auand Hg) down to ppm limits. Hginteracts with the metal core as well as the functional groups of the capping agents and the interaction is concentration-dependent. To understand the mechanism behind this type of specific interaction, we have used spectroscopic and microscopic techniques such as UV-Vis spectroscopy, luminescence spectroscopy, FTIR (Fourier Transform Infrared Spectroscopy), SEM (Scanning Electron Microscopy), HRTEM (High Resolution Transmission Electron Microscopy), and XRD (X-ray Diffraction). Specific reasons responsible for the interaction of Hghave been proposed.Quantum cluster sensors Mercury detection Nanotechnology and water quality.
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