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The element symbol for silicon spelled out on a fingertip with luminescent silicon nanoparticles.

Photo of silicon element symbol spelled out on a fingertip with luminescent silicon nanoparticles.

The element symbol for silicon, "Si," spelled out on a fingertip with luminescent porous silicon nanoparticles. The finger is being illuminated with an ultraviolet ("black") light, and the bright red-orange photoluminescence is observed. Prepared from high-purity silicon wafers, these nanoparticles provide a nontoxic and biodegradable alternative to conventional quantum dots for drug delivery and medical diagnostic applications.

Credit: Luo Gu, Ji-Ho Park, UCSD

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