Fabrication of pure monoclinic VO2 nanoporous nanorods via a mild pyrolysis process

Innovative sintering process for fabrication of thermochromic smooth VO2 ceramics

“…Many methods have been explored to synthesize VO2 powder including combustion [7,8], hydrothermal [9] and pyrolysis [10]. However, due to the numerous valences of the vanadium element, several oxides such as VO, V2O3, V4O7, VO2, V6O13, V3O7, V2O5, etc.…”

Microflowers Composed of VO2 Nanoflakes for Selective Detection of Acetone and Ammonia

“…VO 2 , a typical polycrystalline phase metal oxide, undergoes a reversible transition from an insulating monoclinic phase to a metallic rutile phase at around 68 °C. , In the process of phase transition, the resistance, charge density, spin state, orbital occupancy, and lattice structure of VO 2 all change dramatically . Monoclinic-phase VO 2 has a more distorted structure than rutile-phase VO 2 , whereas rutile-phase VO 2 possesses a narrower energy band gap and a half-full orbital state than monoclinic-phase VO 2 . − The different features between the monoclinic phase and rutile phase may give rise to multiple selectivity of VO 2 for different gases. In fact, altering the properties of VO 2 with phase modulation has now been used in a number of applications such as Mott field effect transistors, thermochromic devices, optoelectronic switches, and memristors. − For instance, Luo et al reported novel hyper-FET devices based on MoS 2 /VO 2 or WSe 2 /VO 2 heterostructures with photodetection performance significantly improved by combining the phase transition of VO 2 .…”

Synthesis and Characterization of Micro/Nanoscale VO2(M) through Vanadylethylene Glycolate Decomposition

“…A variety of approaches were explored to prepare VO 2 . − Thermal pyrolysis gives rise to the prospect of mass production. Vanadylethylene glycolate (VEG; VO­[OCH 2 CH 2 O]) is a widely used vanadium precursor for VO x synthesis. − Ammonium metavanadate (NH 4 VO 3 ) could be reduced by ethylene glycol (EG; C 2 H 6 O 2 ) with the consequent formation of a VEG complex [V­(4+)], as illustrated in eq : …”

“…Elongated cuboid- or rodlike-shaped VEG forms and aggregates into spherical microparticles to reduce the total energy of the system. ,, The synthesis is typically performed using 0.1 M of metavanadate full dissolution (low precursor concentration) and VEG precipitation (high concentration). Beyond the precipitate formation temperature, the synthesis temperature shows almost no effect on the VEG morphology.…”