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Alkali metal intercalated titanate nanotubes: A vibrational spectroscopy study |
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| Authors: | Bartolomeu C VianaOdair P Ferreira Antonio G Souza Filho Angel A HidalgoJosué Mendes Filho Oswaldo L Alves |
| Institution: | a Departamento de Física, Universidade Federal do Piauí - UFPI, P.O. Box CEP 64049-550, Teresina, PI, Brazil b LQES - Laboratório de Química do Estado Sólido, Instituto de Química, Universidade Estadual de Campinas - UNICAMP, P.O. Box 6154, CEP 13083-970, Campinas, SP, Brazil c Departamento de Física, Universidade Federal do Ceará - UFC, P.O. Box 6030, CEP 60455-900, Fortaleza, CE, Brazil |
| Abstract: | Alkali metal (Li+, Na+, K+) intercalated titanate nanotubes have been studied by vibrational spectroscopy (Raman and FT-infrared), X-ray diffraction, and electron microscopy. The vibrational spectroscopic data shown that the most affected vibrational mode is that related to Ti-O bond whose oxygen is not shared among the TiO6 units of the framework structure. A correlation between vibrational frequency shifts and intercalated metal was found, thus showing that vibrational spectroscopy is very useful for probing metal intercalated titanate nanotubes. Our results provide good evidences that the structure of titanate layers in titanate nanotube, a subject of long debate in the literature, is similar to trititanates (like Na2Ti3O7). |
| Keywords: | Titanate nanotubes Raman spectroscopy Inorganic nanotubes |
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