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Yamashita, Mika; Kameyama, Koichi; Yabe, Shinryo; Yoshida, Sakae; Fujishiro, Yoshinobu; Kawai, Takuya; Sato, Tsuyoshi

doi:10.1023/a:1013819310041

Cited by 130 publications

(66 citation statements)

References 5 publications

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“…For all the prepared films, the bandgap was found in the range 2.5±3.0 eV, appreciably lower values than those expected for the bulk material. [2,5] This difference could be ascribed to oxygen deficiency, [27,79,80] Table 1). …”

Section: Optical Absorptionmentioning

confidence: 99%

Nucleation and Growth of Nanophasic CeO₂ Thin Films by Plasma‐Enhanced CVD

Barreca¹,

Gasparotto

Tondello

et al. 2003

Chemical Vapor Deposition

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Nanophasic CeO 2 -based thin films were grown at low temperatures on SiO 2 and Si(100) by plasma-enhanced (PE) CVD from a Ce IV b-diketonate first generation precursor. Film depositions were carried out in low-pressure Ar±O 2 plasmas at temperatures between 150 C and 300 C. The film microstructure was investigated by glancing incidence X-ray diffraction (GIXRD) and transmission electron microscopy (TEM), while the surface and in-depth chemical composition was studied by X-ray photoelectron spectroscopy (XPS), and secondary ion mass spectrometry (SIMS), respectively. Optical properties were analyzed by UV-vis optical absorption. Nanostructured CeO 2 -based films, with crystal size less than 6 nm and a controllable Ce IV /Ce III ratio, were obtained at temperatures even lower than that required for precursor vaporization (170 C). In particular, TEM analyses showed an island growth mode and different microstructural features as a function of the substrate used.

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Section: Optical Absorptionmentioning

confidence: 99%

Nucleation and Growth of Nanophasic CeO₂ Thin Films by Plasma‐Enhanced CVD

Barreca¹,

Gasparotto

Tondello

et al. 2003

Chemical Vapor Deposition

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“…The characteristic X-ray of Ce was only detected and no presence of Sm was confirmed in the anodically deposited thin films. While the electrochemical oxidation of Ce 3+ to Ce(OH) 4 proceeds under an anodic bias, Sm 3+ is impossible to be oxidized to a higher valence similar to other rare earth metals except for Pr 3+ . Consequently, the thin film formed by the anodic polarization included only oxidized Ce species.…”

Section: Influence Of Cathodic Potential On Film Formationmentioning

confidence: 99%

“…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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“…Having band gap energy of ca. 3eV, it exhibits a unique absorbing ability in the ultraviolet range and is used as a blocking material in the UV-shielding [6,7]. Physical and chemical properties of ceria can be tuned by doping.…”

Section: Introductionmentioning

confidence: 99%

Samarium-Doped Ceria Nanostructured Thin Films Grown on FTO Glass by Electrodepostion

et al. 2011

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Electrical, optical or catalytic properties of ceria can be tuned via doping by rare earth elements. The innate properties of ceria-based materials can be further amplified by using nanostructured ceria. In this study, Sm-doped ceria (SDC) coatings were grown on the FTO glass substrate by means of cathodic deposition. Films were obtained from mixed Sm 3+ /Ce 3+ aqueous nitrate solutions, applying -0.8V/(SCE) potential for 1 h. Selected conditions gave rise to adherent, homogeneous and well-covering nanostructured SDC thin films. EDX analysis showed that 0.8 and 1.5 mol% Sm 3+ led to 3.4 and 6.3 at.% Sm in the SDC films. XRD and Raman analysis confirmed the formation of cubic fluorite-type CeO2. However, Sm-doping decreased the crystallite size of nanostructured ceria. The effect of annealing on SDC film was also studied. An improvement in crystallite quality was found with increasing temperature. Optical absorption properties were studied and the band gap value (Eg) of 3.07 eV was determined for pure ceria. Sm-doped ceria exhibited a red shifting. The Eg values were 2.97 and 2.81 eV, in due order.PACS: 81.15.Pq, 68.55.Ln, 61.46Km, 78.67.-n 1.IntroductionCeria and ceria-based materials have been attracting academic and technological attention owing to a wide range of their applications in heterogeneous catalysis, oxygen gas sensors, solid electrolyte fuel cells, and especially, three way catalysts for automobile exhaust systems [1][2][3][4][5]. High performance of ceria is largely based on the ease of reducing Ce 4+ to Ce 3+ , high oxygen storage capacity, and high oxygen ion conductivity. Ceria also displays optical properties, which are of great interest for its application. Having band gap energy of ca. 3eV, it exhibits a unique absorbing ability in the ultraviolet range and is used as a blocking material in the UV-shielding [6,7]. Physical and chemical properties of ceria can be tuned by doping. Great attention has been focused on the doping of ceria by rare earth elements, found to bring an improvement in its electrical, optical, magnetic or catalytic properties [8][9][10]. In addition, during the past decades, it has been demonstrated that the intrinsic properties of these materials can be further amplified by their nanostructures of specially designed morphologies, in particular a (1D) [11,12]. Naturally, there is an ongoing interest in production of ceriabased low dimensional nanostructures as well, because of * corresponding author; e-mail: ljzivkovic@vinca.rs their great potentialities as catalysts, sensors, or building blocks in novel devices [13][14][15]. However, building a pathway to combine both of these advantages, morphology and dopant effect, represents nowadays a research challenge.Chemical methods are recognized as a promising route to the fabrication of a variety of ceria nanostructures, although often requiring long or harsh experimental conditions [16][17][18][19]. Our group has demonstrated recently that a rod-like nanostructured-ceria film can be grown on FTO glass substrate by electroche...

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Untitled

Cited by 130 publications

References 5 publications

Nucleation and Growth of Nanophasic CeO₂ Thin Films by Plasma‐Enhanced CVD

Nucleation and Growth of Nanophasic CeO₂ Thin Films by Plasma‐Enhanced CVD

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

Samarium-Doped Ceria Nanostructured Thin Films Grown on FTO Glass by Electrodepostion

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Untitled

Cited by 130 publications

References 5 publications

Nucleation and Growth of Nanophasic CeO2 Thin Films by Plasma‐Enhanced CVD

Nucleation and Growth of Nanophasic CeO2 Thin Films by Plasma‐Enhanced CVD

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

Samarium-Doped Ceria Nanostructured Thin Films Grown on FTO Glass by Electrodepostion

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Nucleation and Growth of Nanophasic CeO₂ Thin Films by Plasma‐Enhanced CVD

Nucleation and Growth of Nanophasic CeO₂ Thin Films by Plasma‐Enhanced CVD