5 years ago

Vertically-aligned silicon carbide nanowires as visible-light-driven photocatalysts

Vertically-aligned silicon carbide nanowires as visible-light-driven photocatalysts
Vertically-aligned crystalline silicon carbide nanowires (VASiCs) (1mm long and 50–90nm in diameter) were synthesised in gram scale using SiO2-infiltrated vertically-aligned multi-wall carbon nanotubes (VACNTs) and Si powder. In situ residual gas analysis was employed to study their formation and revealed CO to be the main by-product during synthesis. The in situ studies also showed that the formation of VASiCs begins at 1150°C with the growth rate reaching a maximum at 1350°C. A possible growth mechanism was established based on both, in situ and ex situ characterisation. The VASiCs have an estimated band gap of 2.15eV, are photocatalytically active, and show strong light absorbance of up to 577nm. Under UV–vis light (260–800nm) as grown VASiCs could remove 90% Rhodamine B (RhB) within 30min. Over period of 4h under visible light (400–800nm) more than 95% RhB was removed demonstrating their potential as visible-light-driven photocatalysts.

Publisher URL: www.sciencedirect.com/science

DOI: S0926337317305994

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