Abstract
AbstractWith the aim to impart hydrophilic properties to porous silicon (PSi) containing luminescent Si nanocrystals the PSi surface has been modified by a non‐ionic surfactant (undecylenic acid) either physically (by physisorption) or chemically (through Si‐C bond). PSi luminescence spectra and reversible quenching of the luminescence by molecular oxygen have been studied as a function of time elapsed after PSi surface immersion in water. The data obtained indicate that Si nanocrystal surface oxidation, which is realized in water, is accompanied by an appearance of a new type of luminescence centres, which are quenched by molecular oxygen differently than free excitons. SiO‐related surface states are suggested to be responsible for the observed effect. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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