title: Novel soft-chemistry route of Ag2Mo3O10·2H2O nanowires and in situ photogeneration of a Ag@Ag2Mo3O10·2H2O plasmonic heterostructure.
abstract: Ultrathin Ag2Mo3O10·2H2O nanowires (NWs) were synthesized by soft chemistry under atmospheric pressure from a hybrid organic-inorganic polyoxometalate (CH3NH3)2[Mo7O22] and characterized by powder X-ray diffraction, DSC/TGA analyses, FT-IR and FT-Raman spectroscopies, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Their diameters are a few tens of nanometers and hence much thinner than that found for silver molybdates commonly obtained under hydrothermal conditions. The optical properties of Ag2Mo3O10·2H2O NWs before and after UV irradiation were investigated by UV-vis-NIR diffuse reflectance spectroscopy revealing, in addition to photoreduction of Mo(6+) to Mo(5+) cations, in situ photogeneration of well-dispersed silver Ag(0) nanoparticles on the surface of the NWs. The resulting Ag@Ag2Mo3O10·2H2O heterostructure was confirmed by electron energy-loss spectroscopy (EELS), X-ray photoelectron spectroscopy (XPS), and Auger spectroscopy. Concomitant reduction of Mo(6+) and Ag(+) cations under UV excitation was discussed on the basis of electronic band structure calculations. The Ag@Ag2Mo3O10·2H2O nanocomposite is an efficient visible-light-driven plasmonic photocatalyst for degradation of Rhodamine B dye in aqueous solution.
authors.affiliation: Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex, France.
authors.forename: Khadija
authors.initials: K
authors.lastname: Hakouk
authors.forename: Philippe
authors.initials: P
authors.lastname: Deniard
authors.forename: Luc
authors.initials: L
authors.lastname: Lajaunie
authors.forename: Catherine
authors.initials: C
authors.lastname: Guillot-Deudon
authors.forename: Sylvie
authors.initials: S
authors.lastname: Harel
authors.forename: Zeyan
authors.initials: Z
authors.lastname: Wang
authors.forename: Baibiao
authors.initials: B
authors.lastname: Huang
authors.forename: Hyun-Joo
authors.initials: HJ
authors.lastname: Koo
authors.forename: Myung-Hwan
authors.initials: MH
authors.lastname: Whangbo
authors.forename: Stéphane
authors.initials: S
authors.lastname: Jobic
authors.forename: Rémi
authors.initials: R
authors.lastname: Dessapt
mesh_terms: D015394:Molecular Structure; D008982:Molybdenum / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D012834:Silver; D008982:Molybdenum; D010100:Oxygen