Low-Cost and Facile Synthesis of the Vanadium Oxides V₂O₃, VO₂, and V₂O₅and Their Magnetic, Thermochromic and Electrochromic Properties

Abstract

In this study, vanadium sesquioxide (VO), dioxide (VO), and pentoxide (VO) were all synthesized from a single polyol route through the precipitation of an intermediate precursor: vanadium ethylene glycolate (VEG). Various annealing treatments of the VEG precursor, under controlled atmosphere and temperature, led to the successful synthesis of the three pure oxides, with sub-micrometer crystallite size. To the best of our knowledge, the synthesis of the three oxides VO, VO, and VO from a single polyol batch has never been reported in the literature. In a second part of the study, the potentialities brought about by the successful preparation of sub-micrometer VO, VO, and VO are illustrated by the characterization of the electrochromic properties of VO films, a discussion about the metal to insulator transition of VO on the basis of in situ measurements versus temperature of its electrical and optical properties, and the characterization of the magnetic transition of VO powder from SQUID measurements. For the latter compound, the influence of the crystallite size on the magnetic properties is discussed.

Solution combustion synthesis of crystalline V2O3 and amorphous V2O3/C as anode for lithium‐ion battery

“…These methods usually require inert atmosphere protection, high‐temperature treatment (~600°C), and relatively long preparation time. Mjejri prepared V 2 O 3 powder by annealing a vanadyl glycolate precipitate at 500°C for 2 hours in a 95% Ar/5% H 2 gas mixture . Dong prepared V 2 O 3 /C nanocomposites by polymer‐pyrolysis of vanadium salts at 600°C for 3 hours under inert gas protection …”

Facile Synthesis of Flock‐Like V2O3/C with Improved Electrochemical Performance as an Anode Material for Li‐Ion Batteries

“…Figure S1, Supporting Information shows the X‐ray diffraction (XRD) patterns of the product before annealing. It can be found that the product is VEG . The XRD patterns of V 2 O 3 /C are shown in Figure a.…”

“…It can be found that the product is VEG. [28] The XRD patterns of V 2 O 3 / C are shown in Figure 2a. It is clearly seen from the figure that the pattern of V 2 O 3 /C-500 is consistent with the standard pattern of V 2 O 3 (PDF#71-0343).…”

Modulated Metal–Insulator Transition Behaviors in Vanadium Dioxide Nanowires with an Artificial Oxidized Domain

“…In addition, controlling chemical defects helps to manipulate correlated phases in 1D VO 2 nanostructures and then understand the essential physics behind MIT. Selected‐area nanoengineering has opened up an alternative route to construct 1D axial heterostructures and control multifunctional characteristics by locally adjusting electron density or band alignment at nanoscale . Nevertheless, the nanoscale selected‐area manipulation and modification of VO 2 nanostructures still remain great challenges, and few reports focus on selected‐area chemical doping for adjusting MIT characteristics in vanadium oxide nanostructures .…”

“…Selected‐area nanoengineering has opened up an alternative route to construct 1D axial heterostructures and control multifunctional characteristics by locally adjusting electron density or band alignment at nanoscale . Nevertheless, the nanoscale selected‐area manipulation and modification of VO 2 nanostructures still remain great challenges, and few reports focus on selected‐area chemical doping for adjusting MIT characteristics in vanadium oxide nanostructures . Meanwhile, selected‐area chemical nanoengineering (SACNE) has been demonstrated and enables to directly engineer single VO 2 nanowires without undesired lithographical chemicals …”