Nanoparticles of tin oxide (SnO₂) powders were prepared by co-precipitation method at 500 °C, 700 °C and 900 °C temperature. The sintered SnO₂ nanoparticles, structural, optical, magnetic, morphological properties and microbial activity have been studied. XRD studies reveals that sintered powder which exhibits tetragonal crystal structure and both crystallinity as well as crystal size increase with increase in temperature. The morphological studies reveal randomly arranged grains with compact nature grain size increases with sintering temperature. The compositional analyses of SnO₂ nanoparticles have been studied using X-ray photoelectron spectroscopy analysis. The optical band gap values of SnO₂ nanoparticles were calculated to be about 4.3 eV in the temperature 500 °C, comparing with that of the bulk SnO₂ 3.78 eV, by optical absorption measurement. Room temperature M-H curve for pure SnO₂ nanoparticles exhibits ferromagnetic behaviour. The tin oxide nanoparticles are acted as potential candidate material for bacterial and fungal activity.

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