The effect of calcination conditions on the morphology, the architecture and the photo-electrical properties of TiO2 nanotube arrays

Rui Liu, Liang Sheng Qiang, Wein Duo Yang, Hsin Yi Liu

研究成果: Article同行評審

20 引文 斯高帕斯(Scopus)

摘要

Highly ordered TiO2 nanotube arrays were successfully prepared by electrochemical anodization in a formamide-based electrolyte containing 0.5 wt.% NH4F and 2 vol.% H2O. The effects of the calcining temperature, the calcining time and the heating rate on the formation of the TiO2 nanotube arrays were investigated in detail. The morphological changes and phase transformations of the TiO2 nanotubes were analyzed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It was found that the calcining temperature and the calcining time determined the crystal phase, while the heating rate was only beneficial to altering the crystallinity. UV-vis diffuse reflectance spectroscopy was used to examine changes in the band gap energy. For applications to dye sensitized solar cells, a maximum conversion efficiency was achieved at 500 °C for 2 h with a heating rate of 10 °C/min, which is attributed to the highly crystalline anatase and the lower surface defect concentrations of the nanotubes. The optimum calcination conditions help to retard the electron recombination and allow higher dye absorption capacities, thereby increasing Voc and Jsc.

原文English
頁(從 - 到)1458-1467
頁數10
期刊Materials Research Bulletin
48
發行號4
DOIs
出版狀態Published - 2013 四月 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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