Advanced Functional Materials

Cover image for Vol. 24 Issue 44

July 18, 2002

Nanocrystalline porous Si...

exposed to surfactants with cationic or anionic headgroups exhibits dramatically different chemistry and photophysics. The cationic surfactant dodecyltrimethylammonium bromide causes irreversible quenching by catalyzing rapid corrosion of the silicon surface, visualized by IR spectroscopy. The anionic surfactant sodium dodecyl sulfonate, on the contrary, physisorbs to the surface and leads to reversible photoluminescence quenching, probably due to local dielectric effects that increase the non-radiative decay rate in porous silicon. (M. J. Sailor et al., August 5, Adv. Funct. Mater. 2002, 12, 495-500)

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