The synthesis of WO3 · H2O nanotubes under mild conditions is reported by Limin Wu and co-workers, of Fudan University, P.R. China on p. 1790. The synthesis is carried out with the aid of polyaniline (PANI). The PANI molecules are intercalated into tungsten oxide layers to provide a driving force for the formation of nanotubes from nanosheets. By this approach, the nanosheets can be directly rolled into nanotubes. This method could be applied to many other materials that possess layered/lamellar structures for forming nanotubes.
WO3·H2O nanotubes are successfully synthesized with the aid of intercalated polyaniline (PANI) under relatively mild conditions. More interestingly, the WO3·H2O nanotubes have a rectangular cross-section structure formed through a rolling mechanism. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, Fourier-transform infrared analysis, UV-vis-near-IR spectroscopy, selected-area electron diffraction, and vibrating-sample magnetometry analysis are employed to characterize the morphology, structure, and properties of the nanotubes.