Fluorescent silicon nanomaterials have initiated great interest for their potential biological applications. In this paper,
we report the synthesis of water-soluble, luminescent silicon nanoparticles with high quantum yield. The surfaces of
the Si nanoparticles were capped by hydrophobic or hydrophilic organic molecules that passivate and protect the silicon
particles from oxidation. The as-synthesized silicon nanoparticles displayed strong photoluminescence in the blue
region of the visible spectrum. The attached organic molecules conveyed both water solubility and high stability, and
coating had little adverse effect on the optical properties of nanoparticles. These results have major implications
towards using colloidal silicon nanoparticles effectively in biological fluorescence imaging.
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