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• W2170883850 abstract "Silver molybdate (Ag 2 MoO 4 ) and silver tungstate (Ag 2 WO 4 ) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 °C) and co-precipitation (pH 4, 70 °C), and were then used to prepare two core/shell composites, namely α-Ag 2 WO 4 / β-Ag 2 MoO 4 (MAH, pH 4, 140 °C) and β-Ag 2 MoO 4 / β-Ag 2 WO 4 (co-precipitation, pH 4, 70 °C). The shape and size of the microcrystals were observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls and nanorods. These powders were characterized by X-ray powder diffraction and UV-vis (diffuse reflectance and photoluminescence). X-ray diffraction patterns showed that the Ag 2 MoO 4 samples obtained by the two methods were single-phased and belonged to the β-Ag 2 MoO 4 structure (spinel type). In contrast, the Ag 2 WO 4 obtained in the two syntheses were structurally different: MAH exhibited the well-known tetrameric stable structure β-Ag 2 WO 4 , while co-precipitation afforded the metastable β-Ag 2 WO 4 allotrope, coexisting with a weak amount of the α;-phase. The optical gap of β-Ag 2 WO 4 (3.3 eV) was evaluated for the first time. In contrast to β-Ag 2 MoO 4 / β-Ag 2 WO 4 , the α-Ag 2 WO 4 / β-Ag 2 MoO 4 exhibited strongly-enhanced photoluminescence in the low-energy band (650 nm), tentatively explained by the creation of a large density of local defects (distortions) at the core-shell interface, due to the presence of two different types of MOx polyhedra in the two structures." @default.
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• W2170883850 date "2014-01-01" @default.
• W2170883850 modified "2023-10-10" @default.
• W2170883850 title "Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence" @default.
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• W2170883850 doi "https://doi.org/10.5772/58923" @default.
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