A new route to single crystalline vanadium dioxide nanoflakes via thermal reduction

Abstract

Large-area single-crystalline vanadium dioxide nanoflakes were first fabricated via a thermal reduction method in a tube furnace. The sample was characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The results show that VO2 nanoflakes are single-crystalline with a monoclinic structure. The VO2 nanoflakes have a width of 200–300 nm, a thickness of 50–100 nm, and a length up to 1–2 μm. It is found that single-crystalline VO2 nanoflakes show a novel and complicated 5–7-step Li-storage behavior for an insertion amount of <0.6 mol lithium per mol of VO2.

Time-based investigation of the growth of VO2(B) micro- and nanostructures on vanadium by hydrothermal synthesis

“…This can be attributed to V(IV) [17,22]. The difference in binding energy, D, between O1s and V2p can be used to determining the oxidation states in which VO x is in the samples [17,21].…”

“…Previous synthesis of VO 2 has been carried out using both chemical and physical methods such as template-assisted synthesis, solegel synthesis [6], chemical vapour deposition [18], pulsed laser deposition, inverted radio-frequency magnetron sputtering [17], thermal evaporation [12], and hydrothermal synthesis [7,10]. Many of the physical methods are expensive in terms of cost of equipment; are generally energy intensive, requiring high temperatures; are in need of catalysts and are not easily applicable to large scale synthesis.…”

Amorphous Mixed‐Valence Vanadium Oxide/Exfoliated Carbon Cloth Structure Shows a Record High Cycling Stability

“…VO 2 has been reported to be an insoluble and stable phase in the negative potential window in neutral electrolytes . However, it usually exhibits lower reversible capacity (<0.6 mole electrons per mole) than its pentavalent counterpart, V 2 O 5 (3 mole electrons per mole) . Therefore, tuning the valence states of vanadium oxide composites should be a promising way to achieve both high capacity and good cycling stability.…”

Modelling local structural and electronic consequences of proton and hydrogen-atom uptake in VO2 with polyoxovanadate clusters

“…55,56 These energy differences in 1-V IV 6O7 2and 2-V IV 6O6(OSiMe3) 1are 14.7 and 14.9 eV, respectively, which matches well with previous reports on VO2. 57 It is worth noting that a small shift in binding energy is observed when comparing the spectra of complexes 1-V IV 6O7 2and 2-V IV 6O6(OSiMe3) 1-, which is likely due to the sensitivity of core electrons to changes in their local bonding environment. 58 The coordination of a silylium ion to surface of the cluster induces a small shift toward higher binding energy in 2-V IV 6O6(OSiMe3) 1-, indicating that silylium coordination reduces the electron density around the vanadium metal centres across the entire assembly.…”