Abstract

${\mathrm{TiO}}_2$ nanofiber films (${\mathrm{TiO}}_2$ NFF) with visible light scattering ability were prepared using a hydrothermal method. Au nanoparticles (Au NPs) were then deposited on the surface of ${\mathrm{TiO}}_2$ film using a microwave-assisted chemical reduction process. An overlapped light-trapping phenomenon was observed in $\mathrm{Au}/{\mathrm{TiO}}_2$ NFF due to the light-scattering nanostructures of ${\mathrm{TiO}}_2$ film and the localized surface plasmon resonance (LSPR) of Au NPs. The MB degradation over the composite films is much faster than that of pure ${\mathrm{TiO}}_2$ film. The enhanced photocatalytic activity is primarily attributed to the charge transfer property and the overlapped light-trapping nanostructures of $\mathrm{Au}/{\mathrm{TiO}}_2$.

© 2016 Optical Society of America

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