| 초록 |
TiO2 has been mostly used in the photocatalysis due to high activity. However, the large bandgap limits its absorption to UV region, which only possesses 5% of solar energy. Pair of some lanthanides elements can induce long-wavelength radiation and emit shorter wavelength, higher energy radiation by a process called upconversion. Herein β-NaYF4:Yb3+,Tm3+,Gd3+ UCN embedded in a carbon-doped mesostructured TiO2 hybrid film were designed using UCN prepared by hydrothermal process, and a triblock copolymer P123, simultaneously acting as a mesoporous template and a carbon source. The photoactivity of novel material was reflected in the degradation of nitrobenzene. The hierarchical mesostructure provides enhanced surface area and improved pore connectivity, facilitating effective charge carrier transfer and efficient mass flow of the reactants. Carbon-doping in the TiO2 architecture creates a new energy level above the valence band of TiO2, extending absorption to the visible range. |
