Angewandte Chemie · 2014 · 28 citations · 29 references
Natural SciencesChemistryMaterials ScienceCatalysisNanomaterialsNanotechnologyCatalytic MaterialsInorganic NanoparticlesMetal Oxide NanomaterialsPhotocatalysisPhotochemistryPlasmonic NanomaterialsCharge SeparationLocalized Surface Plasmon ResonanceMetal Oxide NanocatalystsNanoparticlesPhotocatalytic MaterialsPhotocatalytic NanomaterialsSelective SynthesisSupported Photocatalysts
Abstract A key to realizing the sustainable society is to develop highly active photocatalysts for selective organic synthesis effectively using sunlight as the energy source. Recently, metal‐oxide‐supported gold nanoparticles (NPs) have emerged as a new type of visible‐light photocatalysts driven by the excitation of localized surface plasmon resonance of Au NPs. Here we show that visible‐light irradiation ( λ >430 nm) of TiO 2 ‐supported Au NPs with a bimodal size distribution (BM‐Au/TiO 2 ) gives rise to the long‐range (>40 nm) electron transport from about 14 small (ca. 2 nm) Au NPs to one large (ca. 9 nm) Au NP through the conduction band of TiO 2 . As a result of the enhancement of charge separation, BM‐Au/TiO 2 exhibits a high level of visible‐light activity for the one‐step synthesis of azobenzenes from nitrobenzenes at 25 °C with a yield greater than 95 % and a selectivity greater than 99 %, whereas unimodal Au/TiO 2 (UM‐Au/TiO 2 ) is photocatalytically inactive.
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All-solid-state Z-scheme in CdS–Au–TiO2 three-component nanojunction system
Hiroaki Tada, Tomohiro Mitsui, Tomokazu Kiyonaga et al. · Nature Materials · 2006 · 1.5K citations