Mechanisms of Structural Reordering During Thermal Transformation of Aluminogermanate Imogolite Nanotubes
2021
Monet, Geoffrey | Rouzière, Stéphan | Vantelon, Delphine | Coelho Diogo, Cristina | Maurin, David | Bantignies, Jean-Louis | Launois, Pascale | Paineau, Erwan
Metal oxide aluminosilicate and aluminogermanate nanotubes, called imogolite nanotubes, are custom-made nanotubes with controlled diameter, morphology, and organization. These nanotubes undergo major structural changes at high temperatures. Here, we report a complete analysis of the structural transformation of single and double-walled aluminogermanate nanotubes, organized or not in bundles, up to 800 °C. Complementary X-ray scattering and spectroscopy experiments were performed. The evolution of both Al and Ge atoms’ coordination during the transformation process was studied in situ. Quantitative analysis of X-ray absorption spectra reveals that the dehydroxylation of nanotubes leads to intermediate stages of “metaimogolite”, which differ in the coordination of the aluminum atoms. A mechanism explaining the major structural reorganization is proposed based on atomic jump processes.
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