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• W2093603296 abstract "Starfish-like TiO2:Sn/SiO2:Sn core−shell nanocables with SiO2:Sn nanowires were synthesized on a silicon substrate by thermal evaporation with addition of hydrogen gas at 1000 °C. In this synthesis, SnO2, silica, and Ti powder were used as source materials. The hydrogen gas served to reduce the SnO2 to SnOx (i.e., SnO) vapors and to reduce the silica to SiOx (i.e., SiO) vapors. These vapors, together with Ti vapor, were incorporated into Au liquid droplets (catalyst heads) and seeded the growth of nanostructures (nanocables and nanowires). FESEM images indicated that each catalyst head functioned as a growth site, such that the nanostructures grew in starfish-like forms via a vapor−liquid−solid (VLS) mechanism. HRTEM images revealed that each nanocable was composed of a single-crystalline rutile TiO2:Sn core (about 10−15 nm in diameter) with an amorphous SiO2:Sn shell (about 50−60 nm in thickness). The amorphous SiO2:Sn nanowires also grew densely on the Si substrate from the catalyst heads because of the high concentration of SiOx vapor. Cathodoluminescence spectra revealed four emission peaks at 373 nm (3.32 eV), 455 nm (2.72 eV), 534 nm (2.42 eV), and 604 nm (2.05 eV) in the as-synthesized products. The TiO2:Sn cores and nanocrystals exhibited a quantum confinement effect, as revealed by Raman spectroscopy. The field-emission properties of the as-synthesized products provided a low turn-on field, which was estimated at ∼3.1 V/μm at a current density of 1 μA/cm2." @default.
• W2093603296 created "2016-06-24" @default.
• W2093603296 creator A5042355641 @default.
• W2093603296 date "2008-08-06" @default.
• W2093603296 modified "2023-10-18" @default.
• W2093603296 title "Sn-Doped Starfish-like Nanostructures from TiO₂−SiO₂ Core−Shell Nanocables and SiO₂ Nanowires: Processing, Properties, and Characterization" @default.
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• W2093603296 doi "https://doi.org/10.1021/jp804173y" @default.
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