Synthesis, Structural Correlations, and Photocatalytic Properties of TiO2 Nanotube/SnO2鈭扨d Nanoparticle Heterostructures

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• 作者：Shou-Yi Chang ; Sih-Fan Chen ; Yi-Ching Huang
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 10, 2011
• 年：2011
• 卷：115
• 期：5
• 页码：1600-1607
• 全文大小：1259K
• 年卷期：v.115,no.5(February 10, 2011)
• ISSN：1932-7455

文摘

In this study, TiO₂/SnO₂鈭扨d heterostructures with enhan-ced photocatalytic activity were synthesized by the sensitization and activation of TiO₂ nanotubes with SnO₂鈭扨d nanoparticles. The growth of the SnO₂鈭扨d nanoparticles was dominated by the crystal structures of the TiO₂ nanotubes and the sensitization time. On 450 掳C annealed anatase TiO₂ nanotubes, grown SnO₂鈭扨d nanoparticles were uniformly stacked in a layer with specific structural orientations of Pd(111)anatase TiO₂(200) and SnO₂(110)anatase TiO₂(101). In contrast, on as-anodized amorphous TiO₂ nanotubes, SnO₂鈭扨d nanoparticles were randomly packed. The deposited rutile SnO₂ nanoparticles induced the crystallization of amorphous TiO₂ into a rutile phase with specific lattice correlations of Pd(111)rutile TiO₂(101) and SnO₂(110)rutile TiO₂(110) during late-stage annealing at 450 掳C. The rutile TiO₂SnO₂鈭扨d heterostructures had a lower photocatalytic efficiency in the degradation of methylene blue than did the anatase heterostructures but had a higher efficiency than the bare TiO₂ nanotubes.