title: Non-wettable, oxidation-stable, brightly luminescent, perfluorodecyl-capped silicon nanocrystal film.
abstract: Here we describe for the first time the synthesis of colloidally stable, brightly luminescent perfluorodecyl-capped silicon nanocrystals and compare the properties of solutions and films made from them with those of their perhydrodecyl-capped relatives. The perfluorodecyl capping group compared to the perhydrodecyl capping group yields superior hydrophobicity and much greater resistance to air oxidation, the enhanced electron-withdrawing character induces blue shifts in the wavelength of photoluminescence, and the lower-frequency carbon-fluorine stretching modes disfavor non-radiative relaxation pathways and boost the absolute photoluminescence quantum yield. Together these attributes bode well for advanced materials and biomedical applications founded upon perfluorodecyl-protected silicon nanocrystals.
authors.affiliation: Department of Chemistry, University of Toronto , Toronto, Ontario M5S 3H6, Canada.
authors.forename: Chenxi
authors.initials: C
authors.lastname: Qian
authors.forename: Wei
authors.initials: W
authors.lastname: Sun
authors.forename: Liwei
authors.initials: L
authors.lastname: Wang
authors.forename: Changlong
authors.initials: C
authors.lastname: Chen
authors.forename: Kristine
authors.initials: K
authors.lastname: Liao
authors.forename: Wendong
authors.initials: W
authors.lastname: Wang
authors.forename: Jia
authors.initials: J
authors.lastname: Jia
authors.forename: Benjamin D
authors.initials: BD
authors.lastname: Hatton
authors.forename: Gilberto
authors.initials: G
authors.lastname: Casillas
authors.forename: Marty
authors.initials: M
authors.lastname: Kurylowicz
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Yip
authors.forename: Melanie L
authors.initials: ML
authors.lastname: Mastronardi
authors.forename: Geoffrey A
authors.initials: GA
authors.lastname: Ozin
mesh_terms: D005466:Fluorocarbons / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D012825:Silicon / Q000737:chemistry*; D017155:Wettability
chemical_list: D005466:Fluorocarbons; D049408:Luminescent Agents; D012825:Silicon