Phase identification of vanadium oxide thin films prepared by atomic layer deposition using X-ray absorption spectroscopy

Abstract

X-ray absorption spectroscopy reveals the local structures of atomic-layer-deposited vanadium oxide films subject to heat treatments.

Modulation of ODH Propane Selectivity by Zeolite Support Desilication: Vanadium Species Anchored to Al-Rich Shell as Crucial Active Sites

“…The O-K-edge spectrum region below 535 eV is determined by O-V bonding [ 52 ]. The lines at 529.5 eV and 532 eV correspond to the electronic transitions from the O 1s core to the O 2p–V 3d(t 2g ) and O 2p–V 3d(e g ) states, respectively [ 53 ]. A striking feature for the V-HY deSi zeolite is the domination of the 532 eV line, the effect being much weaker for V-HY.…”

Green Alternatives to Zinc Dialkyldithiophosphates: Vanadium Oxide-Based Additives

“…50 The reduction to V(III) is associated with higher occupation of 3d states, which is reflected by the limited availability of unoccupied states and, hence, a decrease in the intensity of the O 1s → V 3d π + O 2p π peak at 530 eV. 51 The low resolution of the two V 2p → 3d peaks (Figure 5) makes it difficult to determine the presence of mixed valences. However, comparison with the spectra of vanadium oxides and vanadyl acetylacetonates allows identification of the species likely to be present, alongside inferences about the coordination geometry.…”

Eldfellite-type cathode material, NaV(SO4)2, for Na-ion batteries

“…41,[47][48][49] The NEXAFS O K-edge spectra of NaV(SO 4 ) 2 were likely constructed from the O 2p orbitals hybridized with V 3d (t 2g and/or e g ) and V 4sp, and S-O s-bond signals appeared at approximately 529.6, 531.6, 545, and 538 eV. 49 The peak at 529.6 eV corresponds to the unoccupied hybridized orbital of the O 2p orbital and V 3d (t 2g ) orbital, [49][50][51] and this peak partially reversibly changed during the desodiation/sodiation process (i.e., increasing in the intensity during desodiation and decreasing during sodiation). Meanwhile, the spectra at 538 and 545 eV did not change, and the corresponding hybridized orbitals, which were S-O s-bonding and O 2p-V 4sp, respectively, did not play a prominent role in the charge-transfer mechanism.…”