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Abstract
Three-dimensional highly ordered multilayer titanium dioxide (TiO2) inverse opal (TIO) structures with two pore sizes were fabricated over a large surface using a self-convective method. The fabricated TIO multilayers were functionalized with gold nanoparticles (AuNPs) by immersing the samples in solution with gold nanoparticles. The photocatalytic activity of TiO2 was enhanced by 85% via plasmonic activation of AuNPs that increased the lifetime of photogenerated holes and electrons. The improved photocatalytic activity was characterized with both UVA and visible light irradiation using an in-house built gas-phase photoreactor.
Highlights
Semiconductor-based photocatalysts have attracted large attention due to their significant potential for solving environmental problems.[1]
The samples were preheated at 100 °C before the deposition of the other-size PS colloidal particles to guarantee a contact between the assembled PS sphere and glass surface before the deposition of the second layer of PS
High-quality TiO2 IO (TIO) multilayers were fabricated in a large area using a convective self-assembly method for enhanced photocatalytic activity of TiO2
Summary
Semiconductor-based photocatalysts have attracted large attention due to their significant potential for solving environmental problems.[1]. TIO multilayers were produced using a crack-free method that was functionalized with gold NPs (AuNPs) for improved photocatalytic activity of TIO. A sandwichvacuum method[24] was used to remove the precursor overlayers This was carried out successfully, but it induced large cracks into the PS template. The incident light itself can bleach the dyes, and these methods can generate an erroneous result.[25] the NPs may detach from the surface of TIO and transfer into the solution during the sample immersion into the dye-containing solution.[26] To overcome these barriers, a better way to evaluate the photocatalytic activity is by gas-phase mineralization of organic compounds such as acetylene (C2H2) oxidation into carbon dioxide (CO2). The photocatalytic activity measurement was carried out using the in-house built gas-phase photoreactor under both UVA and visible light activation
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