Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 62, Pages 14123-14132Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902886
Keywords
nanoparticles; photochemistry; silver; surface plasmon resonance; water splitting
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Many strategies have been adopted to improve the photoinduced features of zinc oxide nanostructures for different application fields. In this work, zinc oxide has been synthesised and decorated by plasmonic metal nanoparticles to enhance its photocatalytic activity in the visible range. Furthermore, an insulating layer of SiO2 has been grown between the surface of zinc oxide nanoflakes and silver nanoparticles. A synthetic procedure that allows the accurate modulation of the insulating layer thickness in the range 5-40 nm has been developed. Evidences highlight the crucial role of the SiO2 layer in dramatically increasing photocatalytic water oxidation promoted by the nanostructure under both UV and visible illumination. An ideal thickness value of about 10 nm has been demonstrated to guarantee the plasmon-induced resonance energy-transfer process and to quench the Forster resonance energy-transfer mechanism; thus, optimising the local surface plasmon resonance effect and water oxidation properties.
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