Advanced Nanoarchitectures with Photocatalytic Functionality (eBook, PDF)
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Two novel nanoarchitectures – including the highly branched spikecube exemplified by β-SnWO4 and the biomimetic nanopeapod manifested in Au@Nb@HxK1-xNbO3 – were put forward for the first time in this dissertation, particularly aiming at enriching the library of pattern designs for sunlight-driven photo(electro)chemical applications. Specifically, β-SnWO4 spikecubes were entitled on the basis of the peculiar morphology, wherein bundles of nanopillars were self-aligned with quasi-periodicity onto each sharp face of hexahedral cube cores. Moreover, this geometric enginee...
Two novel nanoarchitectures – including the highly branched spikecube exemplified by β-SnWO4 and the biomimetic nanopeapod manifested in Au@Nb@HxK1-xNbO3 – were put forward for the first time in this dissertation, particularly aiming at enriching the library of pattern designs for sunlight-driven photo(electro)chemical applications. Specifically, β-SnWO4 spikecubes were entitled on the basis of the peculiar morphology, wherein bundles of nanopillars were self-aligned with quasi-periodicity onto each sharp face of hexahedral cube cores. Moreover, this geometric engineering was particularly carried out on a Scheelite-type (ABO4) β-SnWO4 crystal with a visible-light-active band gap of 2.91 eV and subtle conduction and valence band positions, endowing the photoexcited electron-hole pairs on β-SnWO4 with strong reducing and oxidizing power, respectively. Consequently, an outstanding photocatalytic activity in degrading organic dyes was observed for the β-SnWO4 spikecube with an enhancement more than 150% in comparison with a benchmark visible-light-active WO3 photocatalyst. By contrast, the design of Au@Nb@HxK1-xNbO3 emulates the growth pattern of a natural plant – a peapod –, wherein sub-10 nm core-shell Au@Nb plasmonic bimetallics as the particulate peas seeded discretely inside the unidirectional cavity of the tubular HxK1-xNbO3 semiconductor as the pod. The biomimicry of this configuration endows the Au@Nb@HxK1-xNbO3 nanopeapods with strong light harvesting abilities, wherein the HxK1-xNbO3 nanopod and the Au@Nb nanopeas absorb ultraviolet and visible light via interband transition and surface plasmon resonance, respectively. More importantly, the strong near-field plasmon-plasmon coupling between neighboured Au@Nb nanoparticles allows the Au@Nb@HxK1-xNbO3 nanopeapod absorbing near-infrared light. Last but not least, dye photodegradation and water photoelectrolysis as proofs-of-concept manifested the full-spectrum utilization of diffusive solar energy by the Au@Nb@HxK1-xNbO3 nanopeapod for environmental remediation and fuel generation, respectively.
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