In the current research work, we have synthesized and characterized the manganese oxide nanoparticles dispersed in silica via the sol–gel method. The outcomes and phenomenon associated with structural morphology are put forward for different applications. Nanocrystalline manganese oxide was annealed at various temperatures as 300℃, 600℃, and 900 °C. The Structural properties of the prepared powder were determined by using X-ray diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR) spectra. Whereas surface morphology was explored through Scanning Electron Microscope (SEM), EDX, etc. The average crystalline size of ∼ 16.5 nm has been obtained using well known Debye-Scherer's formula. After a study of multiphase manganese oxide nanoparticles, the results of optical and catalytic behavior were obtained which give rise to many applications in the optoelectronic industry as well as in the catalytic industry. In the nanometer-size of the prepared powders, the maximum of the active sites lies at the exterior, therefore such materials could be extra efficient catalysts than their micrometer/bulk counterparts. In the present study, the role of crystallite size and surface area is elaborated to explore the industrial-scale application of the prepared multiphase manganese oxide nanoparticles.
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