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- W2080931747 abstract "This letter reports on the successful synthesis of hydrogen titanate nanotubes (H−Ti-NT) and TiO2 (anatase) nanotubes and their thermal solid-state transformational chemistry and clarifies some of the confusion surrounding their literature Raman vibrational assignments. Hydrothermally prepared titanate nanotube powders with negligible (<0.1 wt % Na, H−Ti-NT) and high (∼7.0 wt % Na, Na/H−Ti-NT) Na content, that underwent freeze-drying and thermal treatments, were prepared and characterized with ambient and in situ Raman spectroscopy. The H−Ti-NT phase gives rise to Raman bands at ∼195, 285, 458, ∼700, 830, and 926 cm−1. The Raman bands above 650 cm−1 were found to be sensitive to the presence of moisture, which indicates that they are related to surface vibrational modes. The titanate nanotube Raman band at ∼926 cm−1 was shown not be related to a Na−O−Ti vibration, which was previously assigned in the literature, since its intensity does not vary with Na content, which varied by a factor of >70. The nanotubular H−Ti-NT phase was found to be thermally stabilized, <700 °C, by Na that had been entrapped during synthesis. The Na-free H−Ti-NT phase, however, transformed to TiO2 (anatase) nanotubes upon heating above 200 °C and was stable up to 700 °C." @default.
- W2080931747 created "2016-06-24" @default.
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- W2080931747 date "2009-11-10" @default.
- W2080931747 modified "2023-10-17" @default.
- W2080931747 title "Characterization of Hydrothermally Prepared Titanate Nanotube Powders by Ambient and In Situ Raman Spectroscopy" @default.
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- W2080931747 doi "https://doi.org/10.1021/jz900025r" @default.
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