Nanohybrids composed of carbon dots and gold nanoparticles are of considerable interest for luminescence imaging, photocatalysis, luminescence sensing and nonlinear optics. We describe a method for controlled growth of Au nanoparticles on the carbon nanodots by photocatalytic reduction of Au(III) ions under blue light irradiation. The resulting Au-carbon dots nanohybrids exhibit enhanced nonlinear photoluminescence under near-infrared femtosecond laser excitation with intensity which sharply depends on the gold to carbon dots volume ratio. Bright broadband photoluminescence of nanohybrids makes them attractive for luminescent imaging.
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