ADVANCED NANOARCHITECTURES WITH PHOTOCATALYTIC FUNCTIONALITY

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ISBN: 9783736997806 Géneros: PB Sinópsis: Two novel nanoarchitectures including the highly branched spikecube exemplified by βSnWO4 and the biomimetic nanopeapod manifested in AuNbHxK1xNbO3 were put forward for the first time in this dissertation particularly aiming at enriching the library of pattern designs for sunlightdriven photoelectrochemical applications Specifically βSnWO4 spikecubes were entitled on the basis of the peculiar morphology wherein bundles of nanopillars were selfaligned with quasiperiodicity onto each sharp face of hexahedral cube cores Moreover this geometric engineering was particularly carried out on a Scheelitetype ABO4 βSnWO4 crystal with a visiblelightactive band gap of 291 eV and subtle conduction and valence band positions endowing the photoexcited electronhole pairs on βSnWO4 with strong reducing and oxidizing power respectively Consequently an outstanding photocatalytic activity in degrading organic dyes was observed for the βSnWO4 spikecube with an enhancement more than 150 in comparison with a benchmark visiblelightactive WO3 photocatalyst By contrast the design of AuNbHxK1xNbO3 emulates the growth pattern of a natural plant a peapod wherein sub10 nm coreshell AuNb plasmonic bimetallics as the particulate peas seeded discretely inside the unidirectional cavity of the tubular HxK1xNbO3 semiconductor as the pod The biomimicry of this configuration endows the AuNbHxK1xNbO3 nanopeapods with strong light harvesting abilities wherein the HxK1xNbO3 nanopod and the AuNb nanopeas absorb ultraviolet and visible light via interband transition and surface plasmon resonance respectively More importantly the strong nearfield plasmonplasmon coupling between neighboured AuNb nanoparticles allows the AuNbHxK1xNbO3 nanopeapod absorbing nearinfrared light Last but not least dye photodegradation and water photoelectrolysis as proofsofconcept manifested the fullspectrum utilization of diffusive solar energy by the AuNbHx
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