A Facile Method to Control the Diameter of Monoclinic Vanadium Dioxide Rods

Area of Science:

• Materials Science
• Nanotechnology
• Inorganic Chemistry

Background:

• Vanadium dioxide (VO2) exhibits thermochromic properties, making it a material of interest for smart windows and optical switches.
• Controlling the morphology and dimensions of VO2 nanostructures is crucial for optimizing their performance in various applications.
• Hydrothermal synthesis offers a versatile route for fabricating nanostructured materials with tailored properties.

Purpose of the Study:

• To synthesize nano/submicro vanadium dioxide rods in the monoclinic phase (VO2 (M)).
• To investigate the influence of synthesis parameters on the morphology, diameter, and diameter distribution of VO2 (M) nanorods.
• To elucidate the growth mechanism of vanadium dioxide nanorods.

Main Methods:

• Hydrothermal reaction followed by calcination was employed for VO2 (M) synthesis.
• Transmission electron microscopy (TEM) was used to characterize sample morphology.
• X-ray diffraction (XRD) was utilized for structural analysis.

Main Results:

• Nano/submicro VO2 (M) rods with diameters ranging from 210 nm to 1 μm were successfully synthesized.
• The concentration of Vanadium pentoxide (V2O5) solution was identified as the primary factor controlling nanorod diameter.
• A higher molar ratio of V2O5 to oxalic acid favored the formation of VO2 rods with narrower diameter distributions.

Conclusions:

• The study successfully demonstrates controlled synthesis of VO2 (M) nanorods via hydrothermal methods.
• Synthesis conditions, particularly V2O5 concentration and molar ratio, are critical for tailoring nanorod dimensions and uniformity.
• The findings provide valuable insights into the growth mechanism of vanadium dioxide nanorods, aiding future material design.