Abstract
This paper describes a method for the synthesis of high quality monoclinic VO2 powder under mild pyrolysis conditions. Vanadyl ethylene glycolate (VEG) precursor powder was synthesized first and the pyrolysis temperature necessary to prevent oxidation into V2O5 was analyzed with the thermal analysis as below 253°C. VO2(M) powder with the highest purity and crystallinity was synthesized at a heat treatment temperature of 190°C for 1h in an air flux of 10L/min. The microstructure analysis showed porous nanorods whose spherical nanoparticles with 20–50nm diameters were agglomerated in the finally synthesized VO2(M) powder. However, the nanopores disappeared with grain growth of nanoparticles in the VO2(M) powder, which underwent peroxidation after high temperature heat treatment. The final product, VO2(M) powder, showed a change in the reversible crystal structure at the transition temperature through the crystalline analysis. In addition, thermal analysis revealed a reversible Metal Insulator Phase Transition (MIPT) phenomenon at about 83°C (heating) and 55°C (cooling). This study confirmed that with a fabrication process using a low pyrolysis temperature, short duration and air atmosphere, mass production is possible and it is suitable for large area application.
Published Version
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