Excitation dependent recombination studies on SnO₂/TiO₂ electrospun nanofibers
2015
Jagadeesh babu, Veluru | Vempati, Sesha | Ertas, Yelda | Uyar, Tamer
Poly(vinyl acetate) (PVAc)/TiO₂ nanofibers, PVAc/SnO₂ nanoribbons and PVAc/SnO₂–TiO₂ nanoribbons were produced via electrospinning. TiO₂ nanofibers and SnO₂ nanoribbons were obtained by removal of the polymeric matrix (PVAc) after calcination at 450 °C. Interestingly, PVAc/SnO₂–TiO₂ nanoribbons were transformed into SnO₂–TiO₂ nanofibers after calcination under the similar conditions. Fiber morphology and elemental mapping confirmed through SEM and TEM microscope techniques respectively. The X-ray diffraction measurements suggested the presence of anatase TiO₂ and rutile SnO₂ and both were present in the SnO₂–TiO₂ mixed system. Systematic photoluminescence studies were performed on the electrospun nanostructures at different excitation wavelengths (λₑₓ₁ = 325, λₑₓ₂ = 330, λₑₓ₃ = 350, λₑₓ₄ = 397 and λₑₓ₅ = 540 nm). We emphasize that the defects in the SnO₂–TiO₂ based on the defect levels present in TiO₂ and SnO₂ and anticipate that these defect levels may have great potential in understanding and characterizing various semiconducting nanostructures.
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