The Effect of Surfactants on the Reactivity and Photophysics of Luminescent Nanocrystalline Porous Silicon (pages 495–500)
C.A. Canaria, M. Huang, Y. Cho, J.L. Heinrich, L.I. Lee, M.J. Shane, R.C. Smith, M.J. Sailor and G.M. Miskelly
Article first published online: 29 JUL 2002 | DOI: 10.1002/1616-3028(20020805)12:8<495::AID-ADFM495>3.0.CO;2-8
Dramatic differences are observed in the chemistry and photophysics of nanocrystalline porous Si exposed to surfactants with cationic or anionic headgroups. 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 other hand, 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.