A Facile Aqueous Coprecipitation Route for the Synthesis of Scheelite-Type MnWO۴ Nanostructures: Structural Characterization by XRD, FTIR, and SEM

manganese tungstate (MnWO۴) nanostructures have attracted significant attention because of their unique optical, luminescent, and photocatalytic properties. In this study, a facile aqueous coprecipitation method was employed to synthesize highly crystalline MnWO۴ nanostructures under mild reaction conditions. Bis(salicylaldehydato) manganese (II) [Mn(Sal)] was used as the manganese precursor, while sodium tungstate dihydrate served as the tungsten source. The synthesis was carried out in distilled water at ۵۰ °C for ۲ h without the need for high-pressure equipment. After that the precipitate calcinated at ۸۰۰ °C for ۳h, allowing complete precipitation of MnWO۴ nanocrystals. The obtained white precipitate was purified by repeated washing and subsequently dried under vacuum at ۶۰ °C. The crystal structure, functional groups, and morphology of the synthesized product were systematically characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The XRD results confirmed the formation of a pure monoclinic wolframite phase of MnWO۴ without detectable impurities. FTIR analysis verified the existence of characteristic tungstate vibrations associated with the WO۴ tetrahedral units, while SEM observations revealed uniform nanostructures produced through the aqueous coprecipitation route. The present synthesis strategy provides a simple, environmentally friendly, and cost-effective approach for producing high-quality MnWO۴ nanostructures suitable for advanced optical and photocatalytic applications.

کلیدواژه ها:

manganese tungstate ، Aqueous coprecipitation ، Water-mediated synthesis ، Monoclinic wolframite structure ، XRD ، FTIR ، SEM