Porous SnO Preparation And Properties Of 2 And Its Complex Structure

1. Porous anodic tin oxide nanostructure was constructed via anodic oxidation of tin foils at room temperature. The optimal conditions for the porous anodic tin oxide nanostructure growth had been explored based on the voltage-, oxalic acid concentration-, and time-dependent reactions. The formation mechanism of the porous anodic tin oxide nanostucture film was also discussed. Raman spectra show an abnormal Raman peak at693cm"1, which was attributed to the IR-active A2uLO mode for the disorder of tin oxide with nanochannels. A broad photoluminescence emission band centered at600nm was disclosed to originate from the electronic states determined by the oxygen vacancies.2. SnS2-SnO2nanocomposites with a heterojunction structure were synthesized via the hydrothermal reaction of SnS2nanoparticles in0.3-6mass%H2O2aqueous solutions at180℃for0.5-12h. The obtained SnS2-SnO2heteroarchitectures with suitable SnO2content showed a great enhancement of the visible light photocatalytic activity to degrade methyl orange. Based on the analysis of high-resolution transmission electron microscopy and photoluminescence spectroscopy, it was found that the formation of heteroarchitectures that effectively separation of photogenerated electrons and holes derived from the coupling effect of SnS2-SnO2heteroarchitectures are responsible for the improvement of the photolytic ability.3. SnO2nanocubes were successfully fabricated via hydrothermal treatment of tin foil in0.1M alkaline aqueous solution at180℃. TEM image of the sample indicates the nanocubes were solid form. Surface morphology was deeply determined by reaction temperature and concentration of alkaline aqueous solution. Based on analysis of-time-dependent experiments, we considered that the formation mechanism of SnO2nanocubes was based on Ostwald ripening mechanism. The PL spectral shows that the emission band at600nm originates from oxygen vacancies.