Titanium dioxide (TiO₂) and iron oxide (Fe₂O₃) nanoparticles (NPs) were successfully deposited on multiwall carbon nanotubes (MWCNTs) films using a low-cost and simple sparking process. The as-deposited film was annealed at 350∘C for 2h to improve their crystallinity. The results show the anatase TiO₂ and hematite Fe₂O₃ NPs with the size of 5–10nm are coated on MWCNTs. The bandgap energy of the as-prepared and the annealed films were 2.3eV and 2.7eV. Photocatalytic activity of the annealed films under visible irradiation is greater than the as-prepared films. Moreover, TiO₂:Fe₂O₃ with the ratio of 3:1 was the optimized condition. Interestingly, the relative current of the annealed films increased to 0.75 when increasing the irradiation time for 5h. This result confirmed that the excited electron from photocatalytic activity can be transferred through the MWCNTs. This is an alternative way to produce the electric current from photocatalysis in the future.

中文翻译：

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火花法制备的 TiO2-Fe2O3 纳米颗粒包覆 MWCNTS 薄膜的光诱导电流产生和光催化活性

二氧化钛 (TiO ₂ ) 和氧化铁 (Fe ₂ O ₃ ) 纳米粒子 (NPs) 使用低成本和简单的火花工艺成功地沉积在多壁碳纳米管 (MWCNTs) 薄膜上。沉积的薄膜在350∘C 为 2h 提高其结晶度。结果表明锐钛矿TiO ₂和赤铁矿Fe ₂ O ₃ NPs 尺寸为5-10nm 涂层在 MWCNTs 上。所制备薄膜和退火薄膜的带隙能量为 2.3eV 和 2.7eV。退火薄膜在可见光照射下的光催化活性高于所制备的薄膜。此外，TiO ₂ :Fe ₂ O ₃的比例为3:1 是优化条件。有趣的是，当辐照时间增加 5 时，退火薄膜的相对电流增加到 0.75H。该结果证实了来自光催化活性的激发电子可以通过多壁碳纳米管转移。这是未来从光催化产生电流的另一种方法。