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Application of vanadium oxide nanoparticles in smart surfaces
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Vanadium oxides (VOx) have been extensively investigated due to their many phases
and range of properties, such as eletrochromic, thermochromic and electrochemical. Therefore,
this promising materials may be implemented as energy efficiency materials in many
sectors like military, industrial, domestic and transport.
In the present dissertation VOx phases and nanostructures have been synthesized
by hydrothermal synthesis using microwave irradiation as heating source. The synthesis
parameters, such as reducing agent, dissolution method and the hydrothermal parameters
temperature, reducing agent concentration and ratios were vary and studied to observe
their impact in morpholy and the resultant VOx phase.
Several pure and combination of VOx phases were achieved, such as VO2 (B), V6O13,
V3O7, VO2 (M2) and V2O5. The structural composition and morphology of the as-obtained
powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy
(SEM), respectively. Additionally, to observe a possible transition temperature of the
samples a thermogravimetry and differential scanning calorimetry (TG-DSC) analysis
were performed.
Furthermore, nanosheets were layered in fluorine doped tin oxide (FTO) and Indium
tin oxide (ITO) and applied as cathode, with a maximum current of 1.75 mA for ITO and
1.46 mA for FTO.
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Vanadium oxides hydrothermal synthesis microwave irradiation nanosheets phase transitions