Abstract
In this presentation, a unique generation of near-infrared electrochemiluminescence (ECL) from water-soluble Au nanoclusters is discussed. Specifically, we report the near-infrared ECL of glutathione-stabilized Au nanoclusters, of which the photoluminescence is primarily within the visible wavelength region. Detailed experimental studies, including spooling ECL spectroscopy and time-resolved optical measurements, suggested that the near-infrared ECL is ascribed to the Au(0)-glutathione motif in the Au nanoclusters. Further studies of individual Au nanoclusters fractionated by gel electrophoresis of as-synthesized Au nanoclusters also revealed that the individual Au nanoclusters exhibited near-infrared ECL that became dominant when the ratio of Au(0) to Au(I) increased in the individual nanoclusters. These indicated that the oxidation states of Au nanoclusters primarily affected the ECL wavelengths of the nanoclusters because the Au(0)-glutathione motif in the nanoclusters was responsible for the near-infrared ECL emission.
Published Version
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