Microtech 2011

Fluorescent Nanodiamonds with Silicon-Vacancy Color Center: An Potential Cellular Biomarker

S. Singh

Keywords: fluorescence, color centers, nanodiamonds


Nanodiamond particles are emerged as a promising candidate as an imaging probe and as a drug and gene delivery agent because of their promising photostable luminescent emission upon incorporation of color centers (mostly nitrogen vacancy), low cytotoxicity and easy surface modification. In our experiments discrete nanodiamond (ND) particles with average size of ~6 nm were microwave plasma treated on silicon substrates in a Chemical vapor deposition (CVD) reactor to create silicon-vacancy centers. Our results represent that SiV incorporated in NDs readily exhibits strong narrow band room temperature fluorescence, even for sub-10 nm size particles (fig 1), in contrast to the well-studied nitrogen-vacancy center (N-V) in diamond which are reported to be relatively unstable and have particle size dependant luminescence properties, with low probability for incorporation of centers in sub-10 nm crystals.

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