XPS and optical properties of sol-gel processed vanadium pentoxide films

Abstract

Vanadium pentoxide xerogels were prepared by using sol-gel technology. As-prepared samples of xerogels were heated up to 580 K in order to remove the bonded water. The chemical composition of xerogel samples and thin films has been studied by X-ray photoelectron spectroscopy (XPS). XPS data have shown that pure V2O5 compound was formed. After thermal treatment, in the XPS spectra the main changes occurred in the vicinity of the O 1s peak due to the removal of water from xerogel. The optical properties of V2O5 films were studied by optical transmission and spectroscopic ellipsometry. Ellipsometric measurements have been carried out in the spectral range of 0.5-5.0 eV at 300 K. The changes in the optical spectra were observed after thermal annealing of as-prepared xerogel samples. The obtained data have shown that thermal treatment of V2O5 thin films has strongly influenced the optical transitions involving both localized and higher-lying conduction bands.

Metasurface Reconfiguration through Lithium‐Ion Intercalation in a Transition Metal Oxide

“…In the literature, the optical properties of (lithiated) V2O5 films has been modeled through a multi-Lorentzian dielectric function [45]. We elaborated this concept performing a similar analysis on an unpatterned region of the film employed for the main experiment, focusing on the spectral range between 550 and 1700 nm.…”

Microwave‐mediated One‐step Synthesis of CeVO4‐rGO Composites with Enhanced Photocatalytic Activity under Visible Light

“…The characteristic peaks of C 1s, O 1s, V 2p, Ce 3d in the survey spectrum (Figure 5a) confirmed the presence of C, O, V and Ce elements in the sample. The deconvoluted C 1s spectrum (Figure 5b) indicated various forms of sp 2 hybridized carbon like (C=C), epoxy or hydroxyl carbon (C−O), carbonyl (C=O) and carboxyl (O−C=O) bonds at binding energies 284.8, 286.7, 287.4 and 288.6 eV, respectively [22,27,28] . The peaks centred at 885.4 eV and 904.1 eV in Ce 3d spectrum are attributed to binding energies of Ce 3d 5/2 and Ce 3d 3/2 respectively (Figure 5c).…”

“…The deconvoluted C 1s spectrum (Figure 5b) indicated various forms of sp 2 hybridized carbon like (C=C), epoxy or hydroxyl carbon (CÀ O), carbonyl (C=O) and carboxyl (OÀ C=O) bonds at binding energies 284.8, 286.7, 287.4 and 288.6 eV, respectively. [22,27,28] The peaks centred at 885.4 eV and 904.1 eV in Ce 3d spectrum are attributed to binding energies of Ce 3d 5/2 and Ce 3d 3/2 respectively (Figure 5c). In V 2p spectrum, two characteristic peaks for V 2p 3/2 and V 2p 1/2 due to pentavalent vanadium appeared at 517 and 523.5 eV, respec-tively (Figure 5d).…”

Hydrothermal synthesis of K3FeF6 and its electrochemical characterization as cathode material for lithium-ion batteries

“…The spectrum of F 1s has one peak ( Fig. 3a), which is located at 684.01 eV, belonging to F-Fe bond [38][39][40]. The Fe2p core level spectrum (Fig.…”