XPS and morphological properties of Cr2O3 thin films grown by thermal evaporation method

Kettab, Ahmed; Schemme, Tobias; Kadri, Dahane; Wollschläger, J.

doi:10.1016/j.rinp.2017.08.036

Cited by 57 publications

(23 citation statements)

References 43 publications

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“…7 shows AFM images of the surface topography of Cr 2 O 3 thin films. Surface topography parameters and average grain size which were estimated from the granularity copulation distribution are tabulated in Table 3 which is well agreed with reported values [13]. The images of Cr 2 O 3 thin film prepared at R.T. shows the surface with uniform island-like topography and some structure of clusters can be clearly observed in figures.…”

Section: Fig 6: X-ray Diffraction Pattern Of Cr 2 O 3 Films Prepared By Pld and Annealed At 300 O Csupporting

confidence: 85%

Annealing effects on optical and structural properties of chromium oxide thin film deposited by PLD technique

Ibrahim¹

2018

IJP

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Optical properties of chromium oxide (Cr2O3) thin films which were prepared by pulse laser deposition method, onto glass substrates. Different laser energy (500-900) mJ were used to obtain Cr2O3 thin films with thickness ranging from 177.3 to 372.4 nm were measured using Tolansky method. Then films were annealed at temperature equal to 300 °C. Absorption spectra were used to determine the absorption coefficient of the films, and the effects of the annealing temperature on the absorption coefficient were investigated. The absorption edge shifted to red range of wavelength, and the optical constants of Cr2O3 films increases as the annealing temperature increased to 300 °C. X-ray diffraction (XRD) study reveals that Cr2O3 thin films are amorphous; while the crystal structure of annealed Cr2O3 films is rhombohedral after annealing at 300 °C for two hour. AFM studies of Cr2O3 thin films exhibit a smooth and well dispersed on the surface.

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Section: Fig 6: X-ray Diffraction Pattern Of Cr 2 O 3 Films Prepared By Pld and Annealed At 300 O Csupporting

confidence: 85%

Annealing effects on optical and structural properties of chromium oxide thin film deposited by PLD technique

Ibrahim¹

2018

IJP

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“…The O(1s) spectrum monitors a broad peak deconvoluted into three subpeaks at binding energy 530, 531 and 532.4 eV. The peaks at 530 and 531 eV are assignable to lattice oxygen, and this is in accordance with previously reported work [31,32]. The peak located at around 532.4 eV was attributed to surface oxygen species and/or adsorbed surface hydroxyls [32].…”

Section: Introductionsupporting

confidence: 86%

Low-Temperature Catalytic CO Oxidation Over Non-Noble, Efficient Chromia in Reduced Graphene Oxide and Graphene Oxide Nanocomposites

et al. 2020

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Herein, bare chromia nanoparticles (Cr2O3 NPs) and chromia supported on reduced graphene oxide (rGO) and graphene oxide (GO) hybrids were synthesized, followed by characterization by means of FESEM, Raman spectroscopy, TGA, XRD, TEM/HRTEM, XPS and N2 sorptiometry. The investigated bare Cr2O3 and the hybrids (Cr2O3/rGO and Cr2O3/GO) were employed as catalysts for low-temperature CO oxidation. Compared with the other catalysts, the results revealed efficient catalytic activity using Cr2O3/GO, which was attributed to its higher surface area together with the mixed oxidation state of chromium (Cr3+ and Cr>3+). These are important oxidation sites that facilitate the electron mobility essential for CO oxidation. Moreover, the presence of carbon vacancy defects and functional groups facilitate the stabilizing of Cr2O3 NPs on its surface, forming a thermally stable hybrid material, which assists the CO oxidation process. The Cr2O3/GO hybrid is a promising low-cost and efficient catalyst for CO oxidation at low temperatures. The higher activity of graphene oxide supported Cr2O3 NPs can provide an efficient and cost-effective solution to a prominent environmental problem.

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“…Initially, survey scans (Figure S4, Supporting Inforamtion) of the sample were recorded followed by high‐resolution spectra for the major detected elements Cr and O and are presented in Figure a and b, respectively. The binding energies of O1s peaks are located in the range 530–531 eV and that for Cr 2p 3/2 peak and 2p 1/2 peak are 576 eV and 586 eV respectively . The O1s peak can be deconvoluted to two peaks located at 529 eV and 531 eV corresponding to metal–oxygen bonds and the surface absorbed oxygen respectively.…”

mentioning

confidence: 97%

Two‐Dimensional Amorphous Cr₂O₃ Modified Metallic Electrodes for Hydrogen Evolution Reaction

Narayanan

Thakur

Balan

et al. 2019

Physica Rapid Research Ltrs

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The surface modification of benchmarked metal catalysts using nanostructured non‐metallic materials for improved performance and stability is an active area of research and is interesting from both a fundamental and an applied perspective. Amorphous few layered nanosheets of Cr2O3 (3–5 nm) are synthesized by rapid thermal exfoliation of CrCl3 · 6H2O precursors and are characterized. The hydrogen evolution reaction (HER) studies on alkaline medium conducted with platinum and gold electrodes modified with amorphous sheets of Cr2O3 show augmented HER activity compared to the pristine ones while Cr2O3 alone is not HER active. The role of amorphous Cr2O3 as a co‐catalyst is established and the synergistic charge transfer effects while coupling Cr2O3 with metal catalysts are studied using electrochemical impedance spectroscopy. Large‐scale processability of amorphous Cr2O3 by rapid thermal treatment along with its high electrochemical stability (>2000 cycles or >50 h) in harsh alkaline conditions, where benchmarked metals fail, open new avenues in designing novel scalable catalysts by protecting the surface of noble metal catalysts without sacrificing the electrochemical performance.

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XPS and morphological properties of Cr2O3 thin films grown by thermal evaporation method

Cited by 57 publications

References 43 publications

Annealing effects on optical and structural properties of chromium oxide thin film deposited by PLD technique

Annealing effects on optical and structural properties of chromium oxide thin film deposited by PLD technique

Low-Temperature Catalytic CO Oxidation Over Non-Noble, Efficient Chromia in Reduced Graphene Oxide and Graphene Oxide Nanocomposites

Two‐Dimensional Amorphous Cr₂O₃ Modified Metallic Electrodes for Hydrogen Evolution Reaction

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XPS and morphological properties of Cr2O3 thin films grown by thermal evaporation method

Cited by 57 publications

References 43 publications

Annealing effects on optical and structural properties of chromium oxide thin film deposited by PLD technique

Annealing effects on optical and structural properties of chromium oxide thin film deposited by PLD technique

Low-Temperature Catalytic CO Oxidation Over Non-Noble, Efficient Chromia in Reduced Graphene Oxide and Graphene Oxide Nanocomposites

Two‐Dimensional Amorphous Cr2O3 Modified Metallic Electrodes for Hydrogen Evolution Reaction

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Two‐Dimensional Amorphous Cr₂O₃ Modified Metallic Electrodes for Hydrogen Evolution Reaction