Rémi Dessapt (MC), Hélène Serier-Brault (MC), Stéphane Jobic (DR), Khadija Hakouk (PhD student)
Ag@metal-oxide semiconductor hybrid nanostructures are plasmonic photocatalysts which combine the localized surface plasmon resonance of the silver metal nanoparticles (NPs) with photoinduced electron transfers into the metal oxide. These materials are of great interest in visible-light induced water splitting, pollutant destruction and bacterial disinfection.We develop a new strategy for the synthesis of plasmonic nanostructures by an « all solid-state » photodeposition method from photoresponsive silver polyoxometalates. The 1D nanocomposite Ag@Ag2Mo3O10.2H2O (Figure 1) is in-situ elaborated by exposing Ag2Mo3O10∙2H2O ultrathin nanowires under a low-power UV irradiation. Quasi spherical silver metal NPs with an average diameter around 10 nm are photogenerated at the surface of the semiconductor according to a mechanism which implies the concomitant reduction of Ag+ and Mo6+ ions. This novel approach is a promising alternative to classical photodeposition methods involving solid-liquid interfaces.