| In the last few years, much attention have been focused on nanoscale structure of vanadium oxide (VOX) due to their remarkable physico-chemical properties and their great potential in so many areas, such as catalysis, sensor and eletrochemical devices. Many methods are explored for the preparation of vanadium oxide.In this work,we synthensized the nanoscale structures by both hydrothermal treatment and electrophoretic deposition and seriously discuss their mechanism each other. The main result are as follows:1. VOX nanotubes and VO2 nanomaterials were synthensized by hydrothermal treatment from V2O5·nH2O sol as precursor. It was found that the synthesis of VOX nanotubes from V2O5·nH2O sols needs shorter duration of hydrothermal treatment (1-5 days), which may give a real advantage in the synthesis of VOX nanotubes. VO2 nanomaterials were prepared by prolonging the duration of the hydrothermal treatment(6-7 days) when VOX nanotubes was destroyed.2.The structure and mechanism of formation of VOX nanotubes were discussed. First, we find the structure of VOX nanotubes is similar to the structure of V7O16. Then, we discover it is different in the VOX slab comparing to the structure of V2O5·nH2O gel after the hydrothermal treatment. Last, we dicuss the mechanism of formation of VOX nanotubes and the developmental history of VOX nanomaterials in the hydrothermal entironment, and conclude the dodecylamine and V4+ is the important factor in the formation of VOX nanotubes.3.Under the different experiment parameters(voltage, sol concentration, HNO3 concentration and working electrode)we prepared the VOX nanomaterials by electrophoretic deposition and discuss the mechanism of formation. After characteration and discussion, we conclude the best experiment parameters are: 30-40V in voltage, 0.01M in sol concentration, 0.8% in HNO3 concentration and anode. The thermal post-treatment is good for its application.
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