Abstract
Sodium titanate nanotubes (NaTiNTs) were synthesized by microwave-assisted hydrothermal treatment of commercial TiO2, at constant temperature (135°C) and different irradiation times (15min, 1, 4, 8 and 16h). The products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, differential scanning calorimetry and specific surface area measurements. The irradiation time turned out to be the key parameter for morphological control of the material. Nanotubes were observed already after 15min of microwave irradiation. The analyses of the products irradiated for 8 and 16h confirm the complete transformation of the starting TiO2 powder to NaTiNTs. The nanotubes are open ended with multi-wall structures, with the average outer diameter of 8nm and specific surface area up to 210m2/g. The morphology, surface area and crystal structure of the sodium titanate nanotubes synthesized by microwave-assisted hydrothermal method were similar to those obtained by conventional hydrothermal method.
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