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Synthesis of novel nanodiamonds - gold core shell nanoparticles

: Minati, L.; Cheng, C.L.; Lin, Y.C; Hees, J.; Lewes-Malandrakis, G.; Nebel, C.E.; Benetti, F.; Migliaresi, C.; Speranza, G.


Diamond and Related Materials 53 (2015), pp.23-28
ISSN: 0925-9635
Journal Article
Fraunhofer IAF ()
nanodiamond; SiV vacancies; photoluminescence; gold shell; bioprobes

This work presents novel diamond-based nanostructures formed by a fluorescent nanodiamond core coated with a gold shell (ND@Au). Gold shell was grown on silicon-doped nanodiamonds in water by controlled reduction of gold chloride. The resulting gold-coated nanodiamond samples were characterized by means of scanning electron microscopy, UV–visible, Raman and luminescence spectroscopies. These gold-coated nanodiamonds showed a strong resonance absorption in the visible and near-infrared (NIR) range. When excited with green laser, the silicon doped nanodiamonds emit a stable fluorescence peaked at about 740 nm due to the SiV centers with no photobleaching and photoblinking. In this work we demonstrate that optical properties of the silicon-doped nanodiamonds are retained after the formation of the gold shell.