title: Size-dependent oxidation of monodisperse silicon nanocrystals with allylphenylsulfide surfaces.
abstract: The synthesis and characterization of size-separated silicon nanocrystals functionalized with a heteroatom-substituted organic capping group, allylphenylsulfide, via photochemical hydrosilylation are described for the first time. These silicon nanocrystals form colloidally stable and highly photoluminescent dispersions in non-polar organic solvents with an absolute quantum yield as high as 52% which is 20% above that of the allylbenzene analogue. Solutions of the size-separated fractions are characterized over time to monitor the effect of aging in air by following the change of their photoluminescence and absolute quantum yields, supplemented by transmission electron microscopy.
authors.affiliation: Karlsruhe Institute of Technology, Center for Functional Nanostructures, Wolfgang-Gaede Str. 1a, Karlsruhe, 76131, Germany.
authors.forename: Julia
authors.initials: J
authors.lastname: Rinck
authors.forename: Dirk
authors.initials: D
authors.lastname: Schray
authors.forename: Christian
authors.initials: C
authors.lastname: Kübel
authors.forename: Annie K
authors.initials: AK
authors.lastname: Powell
authors.forename: Geoffrey A
authors.initials: GA
authors.lastname: Ozin
keywords: air stability; organochalcogenide; oxidation; photoluminescence; quantum yield; silicon nanocrystals; size separation