Influence of the film structure on the properties of electrochromic CeO2 thin films deposited by e-beam PVD

Porqueras, I.; Person, Carles; Bertrán, E.

doi:10.1016/j.tsf.2003.09.034

Cited by 12 publications

(17 citation statements)

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“…The refractive index of the film was n = 0⋅82 ± 0⋅02 at λ = 600 nm which was slightly less than the reported value (Brinker and Scherer 1990;Porqueras et al 2004). This low refractive index can be attributed to the singular ear structure, which could grow from first nuclea- tion layer (Crnjak Orel and Orel 1996;Porqueras et al 2003).…”

Section: Resultsmentioning

confidence: 62%

Optical properties of CeO2 thin films

2007

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Cerium oxide (CeO 2 ) thin films have been prepared by electron beam evaporation technique onto glass substrate at a pressure of about 6 × 10 -6 Torr. The thickness of CeO 2 films ranges from 140-180 nm. The optical properties of cerium oxide films are studied in the wavelength range of 200-850 nm. The film is highly transparent in the visible region. It is also observed that the film has low reflectance in the ultra-violet region. The optical band gap of the film is determined and is found to decrease with the increase of film thickness. The values of absorption coefficient, extinction coefficient, refractive index, dielectric constant, phase angle and loss angle have been calculated from the optical measurements. The X-ray diffraction of the film showed that the film is crystalline in nature. The crystallite size of CeO 2 films have been evaluated and found to be small. The experimental d-values of the film agreed closely with the standard values.

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Section: Resultsmentioning

confidence: 62%

Optical properties of CeO2 thin films

2007

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“…5). As can be seen, the intensity of cubic fluorite CeO 2 reflections (JCPDS file 34-0394) gradually increases with prolonging the deposition time, however, all peaks are broadened (compared with pure CeO 2 reflections) and amorphous-like which is characteristic of Ce(OH) 4 as well, whose structure (Ce(OH) 4 ) is similar with CeO 2 . 32,36 Although the preferential crystal orientation of (220) plane for CeO 2 or Ce(OH) 4 is clearly observed for all samples, the increase of the peak intensity for (111) plane undoubtedly suggests the time-dependent structure evolution.…”

Section: Resultsmentioning

confidence: 95%

“…5) clearly show that all the broadened diffraction peaks at the deposition time of 40 min are mainly originated from CeO 2 or Ce(OH) 4 (Fig. 5a), which indicates that the initial step for the anodic deposition of CeO 2 is the formation of yellow CeO 2 or Ce(OH) 4 following reaction 26,43 Ce…”

Section: Discussionmentioning

confidence: 92%

“…Cerium oxides, particularly ceria (CeO 2 ), have been widely applied in various areas, such as solid oxide fuel cells, 1 polishing agents, 2 catalysts for three-way catalysis of exhaust gas from automobiles, 3 electrochromic, 4 pharmacology, 5 and coatings for corrosion protection of metallic materials. [6][7][8][9][10][11][12] It is well known that pure CeO 2 is pale yellow probably due to Ce(IV) -O(-II) charge transfer.…”

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confidence: 99%

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The Composition-Dependent Color Evolution of Anodic Electrodeposited Cerium Oxide Thin Film

Yang

et al. 2014

J. Electrochem. Soc.

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Cerium oxide thin films with various colors were deposited onto 316L stainless steel using anodic electrodeposition approach. The correlation between color, composition and deposition time has been established. Results show that the film color evolves from golden yellow (1.5 h), purple (3 h), blue (5 h), gray-green (7 h) and turns back to yellow (12 h) again, and all these colored films are stable in the ambient conditions. The film color is related to both the contents of Ce(III) and hydroxide species in the films. The relative content of Ce(III) increases from 21.19% to 27.57% with increasing the deposition time from 1.5 h to 7 h, and then decreases to 22.93% for the film deposited at 12 h. The content of hydroxide species shows the same variation trend as Ce(III) with the deposition time.

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“…Thin films of pure ceria (CeO 2 ) and its solid solutions have many important characteristics, such as ion conducting [1], electrochromic [2], and UV light shielding [3,4] properties. Recently, CeO 2 films have attracted attention as anti-corrosion dopant [5] or as conversion layer [6,7].…”

Section: Introductionmentioning

confidence: 99%

Optimization of electrochemical synthesis conditions for dense and doped ceria thin films

Kamada¹,

Enomoto²,

Hojo³

2009

Electrochimica Acta

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In the present study, the appropriate electrolysis conditions were determined for attaining doped ceria thin films with a high density and adhesion in an aqueous solution containing of Ce 3+ and Sm 3+ ions. Based on a comparison of the anodic and cathodic polarizations, while the former only induced the deposition of Ce 3+ , the latter accomplished the simultaneous deposition of Ce and Sm species. Under an applied cathodic bias below the hydrogen evolution potential, the Ce 3+ and Sm 3+ were reacted with OH -ions generated by the reduction of water molecules, and then were deposited on the electrode as a hydroxide. The hydroxide was subsequently oxidized and dehydrated to form the ceria-based thin layer. The morphologies of the as-deposited films were significantly altered on the basis of the applied potential. Moreover, the addition of acetic acid to the electrolysis bath caused the production of a transparent, dense, and adherent film. The XRD pattern and Raman spectrum of the thin film revealed that the film was crystallized as the fluorite structure without any heat treatment, and Sm 3+ is substituted at the Ce 4+ site. Moreover, the Sm content in the film could be easily controlled by the metal concentration in the solution.

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Influence of the film structure on the properties of electrochromic CeO2 thin films deposited by e-beam PVD

Cited by 12 publications

References 13 publications

Optical properties of CeO2 thin films

Optical properties of CeO2 thin films

The Composition-Dependent Color Evolution of Anodic Electrodeposited Cerium Oxide Thin Film

Optimization of electrochemical synthesis conditions for dense and doped ceria thin films

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