合成条件对V2O5溶胶制备AgVO3准一维纳米材料的影响

以V2O5溶胶和Ag2O为反应物，用超声波辅助处理和水热反应成功制备了AgVO3准一维纳米材料。采用XRD、SEM等方法对产物的结构进行表征和测试，研究了水热反应温度、时间、搅拌与超声处理等条件对AgVO，一维纳米材料合成的影响。结果表明，得到的AgVO，准一维纳米材料长几到数十微米，直径100-400nm的纳米纤维聚集成束状结构。升高水热反应温度和延长反应时间均有利于AgVO，准一维纳米材料的形成，但当反应时间过长时，晶粒的择优取向生长变弱，产物逐渐生长为微米级的块状结构。搅拌和超声处理使固体反应物Ag2O充分、均匀进入到V2O5溶胶层间，使反应在较低温度下就可以进行。

Hydrothermal synthesis of vanadium oxide nanotubes by a facile route

Vanadium oxide nanotubes were synthesized by hydrothermal treatment from V2O5·nH2O sols as precursor and dodecylamine as structure-directing template. The morphology and structure of the nanotubes were characterized by SEM, TEM, XRD, TG-DTA and FTIR. The experimental results reveal that the duration of the hydrothermal treatment is of importance for obtaining VOx-NTs which have a layered structure. TG-DTA study indicates that V5+ cations in nanotubes are partially reduced to V4+ cations. The results from FTIR spectra indicate the difference in V-O vibrations between before and after hydrothermal treatment. From the results, it suggests that during hydrothermal treatment, the rearrangement of the vanadium oxide structure leads to the formation of VOx nanotubes from lamellar structure because of the presence of V4+ species.