Relevant bibliographies by topics / Cerium oxide films

Academic literature on the topic 'Cerium oxide films'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Cerium oxide films"

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Liu, Xiao Zhen, Yu Fan Ni, Xiao Zhou Liu, Le Tian Xia, Jie Chen, and Xiao Yu Zheng. "Effect of Heat Treatment on the Crystal Structure of the Anodic Cerium Oxide Films." Key Engineering Materials 748 (August 2017): 12–16. http://dx.doi.org/10.4028/www.scientific.net/kem.748.12.

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The cerium dioxide films were prepared with cerium foils as raw materials by anodization in Na2C2O4-NH3∙H2O-H2O-(CH2OH)2 electrolyte. The anodic cerium oxide films were heat treated in 100~400°C and 0.5~2.5h, respectively. The heat treated anodic cerium oxide films were characterized with X-ray diffraction (XRD). The heat treated anodic cerium oxide film at 100°C is semi crystalline film. The heat treated anodic cerium oxide film at 200°C, 300°C, 350°C, 400°C, respectively for 2h, is the cerium dioxide film respectively, and has a structure of cubic fluorite respectively. The crystal structures of the cerium dioxide films become more complete with the increase of heat treatment temperature in 200 ~ 400 °C. The heat treated anodic cerium oxide film at 400°C for 0.5h, 1h, 1.5h, 2.5h, respectively, is the cerium dioxide film respectively, and has a structure of cubic fluorite respectively. The crystal structures of the cerium dioxide films become more complete with the increase of heat treatment times in 0.5h ~ 2.5h.
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Liu, Xiao Zhen, Wei Ren Rong, Xiao Zhou Liu, Xiao Hui Ren, Jie Chen, and Ying Zhu. "Preparation of Cerium Dioxide Film by Anodization in Na2C2O4-NH3∙H2O-H2O-(CH2OH)2 Electrolyte." Key Engineering Materials 748 (August 2017): 7–11. http://dx.doi.org/10.4028/www.scientific.net/kem.748.7.

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The cerium dioxide films were prepared with cerium foils as raw materials by anodization in Na2C2O4-NH3∙H2O-H2O-(CH2OH)2 electrolyte. The anodic cerium oxide film was heat treated at 550°C. The cerium dioxide films were characterized with X-ray diffraction (XRD), energy-dispersive analyses of X-ray (EDAX), Fourier transform infrared (FTIR) techniques and scanning electron microcopy (SEM), respectively. The anodic cerium oxide film is semi crystalline film. The heat treated anodic cerium oxide film at 550°C is the fluorite-structured cerium dioxide film, and the crystal structure of the cerium dioxide film becomes more complete than that of the anodic cerium oxide film. The cerium dioxide film is porous film. The water, ethylene glycol and CO2 are adsorbed in the anodic cerium oxide film. The adsorbing water, ethylene glycol and CO2 in the anodic cerium oxide film are removed at 550°C. The cerium dioxide film has strong absorption in the range of 1400~4000cm-1.
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Wang, Adele Qi, and Teresa Diane Golden. "Electrochemical Formation of Cerium Oxide/Layered Silicate Nanocomposite Films." Journal of Nanotechnology 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/8459374.

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Cerium oxide/montmorillonite nanocomposite films were synthesized electrochemically from solutions containing 0.5 to 50% Na-montmorillonite. The nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. Nanocomposite films synthesized from montmorillonite concentrations lower than 10% were continuous, uniform, and dense. X-ray diffraction confirmed that the nanocomposite films retain the face-centered cubic structure of cerium oxide while incorporating exfoliated platelets of the montmorillonite into the matrix. In addition, calculations from XRD data showed particle sizes ranging from 4.50 to 6.50 nm for the nanocomposite coatings. Raman and FTIR spectroscopy had peaks present for cerium oxide and the layered silicates in the coatings. Cross-sectional scanning electron microscopy and energy-dispersive X-ray spectroscopy confirmed the presence of montmorillonite throughout the cerium oxide matrix.
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Wang, Adele Qi, and Teresa D. Golden. "Electrodeposition of Oriented Cerium Oxide Films." International Journal of Electrochemistry 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/482187.

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Cerium oxide films of preferred orientation are electrodeposited under anodic conditions. A complexing ligand, acetate, was used to stabilize the cerium (III) ion in solution for deposition of the thin films. Fourier transform infrared spectroscopy showed that the ligand and metal tended to bind as a weakly bidentate complex. The crystallite size of the films was in the nanometer range as shown by Raman spectroscopy and was calculated from X-ray diffraction data. Crystallite sizes from 6 to 20 nm were obtained under the anodic deposition conditions. Sintering of the (111) oriented films showed an increase in the (111) orientation with temperatures up to 900°C. Also, the crystallite size increased from 20 nm to 120 nm under sintering conditions. Addition of the deposited films to the substrate improved corrosion resistance for the substrate.
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Ortiz, E., L. Martínez-Gómez, J. F. Valdés-Galicia, R. García, M. Anzorena, and L. Martínez de la Escalera. "Skin protection against UV radiation using thin films of cerium oxide." Radioprotection 54, no. 1 (January 2019): 67–70. http://dx.doi.org/10.1051/radiopro/2019002.

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In this work, we evaluated the efficiency of cerium oxide as sunscreen using titanium oxide as standard comparison material. Geant4 software was used to perform numerical simulation, we calculated the radiation dose that ultraviolet radiation deposits in a skin sample as a function of thin film thickness of the sunscreens. We found that in the interval between 5 and 15 nm of the thin film thickness and for wavelengths between 160 and 400 nm, cerium oxide has the potential to reduce the radiation dose more than 10% with respect to the same thickness band of titanium oxide. Using thin films of cerium oxide and titanium oxide with same thicknesses and greater than 45 nm, the difference in the attenuation of the radiation dose for both materials is less than 1%. The results lead us to propose cerium oxide as an alternative material to titanium oxide for the manufacture of sunscreens.
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Jing, Feng Juan, Lu Wang, Y. W. Liu, J. Y. Cheng, Yong Xiang Leng, R. K. Y. Fu, X. B. Zhao, Paul K. Chu, and Nan Huang. "Biocompatibility of Cerium Oxide Films Synthesized by Dual Plasma Deposition." Key Engineering Materials 330-332 (February 2007): 749–52. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.749.

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Cerium oxide films have been fabricated using dual plasma deposition. X-ray diffraction. (XRD) reveals a crystalline phase and X-ray photoelectron spectroscopy (XPS) shows that La exists predominantly in the +4 oxidation state. The activated partial thromboplastin time is longer than that of blood plasma and stainless steel. Furthermore, the numbers of adhered, aggregated and morphologically changed platelets are reduced compared to low-temperature isotropic carbon (LTIC). HUVEC cells exhibit good adhesion and proliferation behavior on cerium oxide films. This study suggests rare earth oxide films are potential blood-contacting biomedical materials.
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Popescu, Simona, Mihaela Mîndroiu, Daniela Cabuzu, and Cristian Pîrvu. "The Roll of NaPSS Surfactant on the Ceria Nanoparticles Embedding in Polypyrrole Films." Journal of Nanomaterials 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/9747931.

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Cerium oxide nanoparticles (CeO2NPs) in crystalline form have been synthesized by a coprecipitation method. CeO2nanoparticles were then embedded in polypyrrole (PPy) films during the electropolymerization of pyrrole (Py) on titanium substrate. The influence of poly(sodium 4-styrenesulfonate) (NaPSS) surfactant used during polymerization on the embedding of CeO2NPs in polypyrrole films was investigated. The new films were characterized in terms of surface analysis, wettability, electrochemical behaviour, and antibacterial effect. The surface and electrochemical characterization revealed the role of surfactant on PPy doping process cerium oxide incorporation. In the presence of surfactant, CeO2NPs are preferentially embedded in the polymeric film while, without surfactant, the ceria nanoparticles are quasiuniformly spread as agglomerates onto polymeric films. The antibacterial effect of studied PPy films was substantially improved in the presence of cerium oxide and depends by the polymerization conditions.
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Gilliss, Shelley R., Jeffrey K. Fairer, N. Ravishankar, Mark G. Schwabel, and C. Barry Carter. "Microanalysis of AFM Tips Coated with Cerium Oxide." Microscopy and Microanalysis 7, S2 (August 2001): 1236–37. http://dx.doi.org/10.1017/s1431927600032256.

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Cerium oxide is widely used for chemomechanical polishing (CMP) of silicate glasses. Uses include finishing of optical elements and planarizing dielectrics in the semiconductor industry. This study is designed to investigate the fundamentals of the cerium oxide/silica CMP process by measuring the interaction force between silicate glasses and cerium oxide. Surface forces involved in the polishing of glass by a cerium oxide abrasive can be studied in a controlled manner by measuring sample-tip interactions between a glass substrate and a cerium oxide tip in an atomic force microscope (AFM). Commercially available AFM tips have been coated with thin, uniform films of cerium oxide. By using a square pyramid tip as a template for the shape of the cerium oxide film, challenges related to irregular or blunt tip shape can be overcome. However, complete characterization of structure, shape and chemical composition is required before useful information can be obtained using the AFM.
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Tsud, Nataliya, Sofiia Bercha, Robert G. Acres, Mykhailo Vorokhta, Ivan Khalakhan, Kevin C. Prince, and Vladimír Matolín. "Functionalization of nanostructured cerium oxide films with histidine." Physical Chemistry Chemical Physics 17, no. 4 (2015): 2770–77. http://dx.doi.org/10.1039/c4cp03780d.

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The surfaces of cerium oxide films were modified by histidine adsorption in vacuum. It was shown that the morphology and structure of the oxide are decisive factors which define the adsorption geometry of the histidine adlayer.
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Yang, L., X. Pang, G. Fox-Rabinovich, S. Veldhuis, and I. Zhitomirsky. "Electrodeposition of cerium oxide films and composites." Surface and Coatings Technology 206, no. 1 (October 2011): 1–7. http://dx.doi.org/10.1016/j.surfcoat.2011.06.029.

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Dissertations / Theses on the topic "Cerium oxide films"

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Maksimchuk, N. "Nanocrystalline Cerium Oxide Films for Microelectronic Biosensor Transducers." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34964.

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The physical properties of thin nanocrystalline cerium oxide films have been studied with the purpose of their application as a functional material of different microelectronic transducers for biosensors: highperformance photoresistors and photodiodes for bioluminescence registration, ion-selective field-effect transistors (ISFET) and MOS-varactors indicating the pH changes as a result of biochemical processes. The effect of technological factors on the photoelectrical, optical, temperature and electrophysical properties of cerium oxide films has been studied. We established the technological conditions which allow to obtain СеОх-films with desired functional characteristics. On the basis of the synthesized nanocrystalline СеОх-films obtained by the "explosive evaporation" method we developed new types of photodetectors for registration of bioluminescent signal (photoresistors and photodiodes) with enhanced photosensitivity (310- 330 mA/lm∙V) in the visible range. Application of cerium oxide based photoresistors in the bioluminometers instead of photomultiplier tubes and avalanche photodiodes allows to significantly reduce the cost of bioluminometer and increase its sensitivity when measuring at alternating signal. On the basis of nanocrystalline СеОх-films obtained by the "metallic mirrors oxidation" method we developed potentiometric biosensory transducers (ion-selective field-effect transistors and MOS-varactors) with CeOx as gate dielectric. It yields higher sensitivity and stability as compared to the use of the SiO2 and Si3N4 films. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34964
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Czerwinski, Franciszek. "The growth and structure of thin oxide films on nickel superficially modified with ceria and cerium." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ36967.pdf.

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Pham, Nam Hung. "Liquid-injection atomic layer deposition of cerium-doped hafnium oxide dielectric films." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539745.

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Mian, A. R. "Some electronic properties of thin dielectric oxide films containing cerium, niobium, vanadium and silicon." Thesis, Brunel University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384096.

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Kuchibhatla, Satyanarayana. "PROBING AND TUNING THE SIZE, MORPHOLOGY, CHEMISTRY AND STRUCTURE OF NANOSCALE CERIUM OXIDE." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4250.

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Cerium oxide (ceria)-based materials in the nanoscale regime are of significant fundamental and technological interest. Nanoceria in pure and doped forms has current and potential use in solid oxide fuel cells, catalysis, UV- screening, chemical mechanical planarization, oxygen sensors, and bio-medical applications. The characteristic feature of Ce to switch between the +3 and + 4 oxidation states renders oxygen buffering capability to ceria. The ease of this transformation was expected to be enhanced in the nanoceria. In most the practical scenarios, it is necessary to have a stable suspension of ceria nanoparticles (CNPs) over longer periods of time. However, the existing literature is confined to short term studies pertaining to synthesis and property evaluation. Having understood the need for a comprehensive understanding of the CNP suspensions, this dissertation is primarily aimed at understanding the behavior of CNPs in various chemical and physical environments. We have synthesized CNPs in the absence of any surfactants at room temperature and studied the aging characteristics. After gaining some understanding about the behavior of this functional oxide, the synthesis environment and aging temperature were varied, and their affects were carefully analyzed using various materials analysis techniques such as high resolution transmission electron microscopy (HRTEM), UV-Visible spectroscopy (UV-Vis), and X-ray photoelectron spectroscopy (XPS). When the CNPs were aged at room temperature in as-synthesized condition, they were observed to spontaneously assemble and evolve as fractal superoctahedral structures. The reasons for this unique polycrystalline morphology were attributed to the symmetry driven assembly of the individual truncated octahedral and octahedral seed of the ceria. HRTEM and Fast Fourier Transform (FFT) analyses were used to explain the agglomeration behavior and evolution of the octahedral morphology. Some of the observations were supported by molecular dynamic simulations. Poly (ethylene glycol) (PEG) and ethylene glycol (EG) were used to control the kinetics of this morphology evolution. The ability to control the agglomeration of CNPs in these media stems from the lower dielectric constant and an increased viscosity of the EG and PEG based solvents. CNPs when synthesized and aged in frozen conditions, i.e. in ice, were found to form one dimensional, high aspect ratio structures. A careful analysis has provided some evidence that the CNPs use the porous channels in ice as a template and undergo oriented attachment to form nanorods. When the aging treatment was done near freezing temperature in solution, the nanorods were not observed, confirming the role of channels in ice. When synthesized in aqueous media such as DI water, PEG and EG; CNPs were observed to exhibit a reversible oxidation state switching between +3 and +4. Band gap values were computed from the optical absorption data. The changes in the band gap values observed were attributed to the changes in the oxidation state of CNPs as opposed to the quantum confinement effects, as expected in other nanoparticle systems. The work presented in this dissertation demonstrates, with evidence, that in order to obtain a comprehensive understanding of the properties of nanoscale materials it is of paramount importance to monitor their behavior over relatively longer periods of time under various ambient environments. While the solution based techniques offer a versatility and low cost route to study the fundamental properties of nanomaterials, they suffer some inherent problems such as precursor contamination and uncontrolled chemical reactions. Especially when analyzing the behavior of ceria-based materials for applications like solid oxide fuel cells, a great control in the density and crystalline quality are desired. In order to achieve this, as a first step pure ceria thin films were synthesized using oxygen plasma assisted molecular beam epitaxy (OPA-MBE). The ceria films were analyzed using various in situ and ex situ techniques to study the crystal structure, growth mode and epitaxial quality of the films. It was observed that the epitaxial orientation of the ceria films could be tuned by varying the deposition rate. When the films were grown at low deposition rate (< 8 Å/min) ceria films with epitaxial (200) orientation were observed where as the films grown at high deposition rates (up to 30 Å/min) showed (111) orientation. Theoretical simulations were used to confirm some of the experimental facts observed in both nanoparticles and thin films.
Ph.D.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science & Engr PhD
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Göbel, Marcus [Verfasser], and Joachim [Akademischer Betreuer] Maier. "Boundary effects on the electrical conductivity of cerium oxide thin films / Marcus Göbel. Betreuer: Joachim Maier." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2013. http://d-nb.info/1032899611/34.

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Nguyen, Ty, and ty nguyen@csiro au. "Preparation, Characterisation and Cell Testing of Gadolinium Doped Cerium Electrolyte Thin Films for Solid Oxide Fuel Cell Applications." RMIT University. Electrical and Computer Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081030.110755.

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Solid Oxide Fuel Cells (SOFCs) are devices that directly convert chemical energy into electrical energy, without proceeding through a Carnot combustion cycle. These devices are based on the usage of solid oxide electrolytes operating at relatively elevated temperatures. Two major hurdles must be overcome in order to decrease the operating temperatures of practical SOFCs. The first relates to reducing ohmic losses within solid electrolytes. The second relates to the need for developing high performance electrodes since electrolyte reaction rates at both anode and cathode are affected detrimentally as operating temperatures fall. This PhD project has focussed on addressing the first hurdle in two innovative ways: 1. the implementation of solid electrolytes with higher ionic conductivity than zirconia, 2. the development of very thin film electrolytes as thick as 5ƒÝm. Several thin films with novel electrode-electrolyte structures were fabricated and evaluated in order to demonstrate the viability of low temperature SOFC operations. Development of such thin films was innovative and challenging to achieve. The approach taken in this work involved fabricating a dense and thin gadolinia doped ceria (10GDC - Gd 10wt%, Ce 90wt%) oxide electrolyte. 10GDC is an electrolyte exhibiting higher conductivities than conventional materials during low temperature operations. A research contribution of this PhD was the demonstration of the deposition of 10GDC thin films using RF magnetron sputtering for the first time. 10GDC thin film electrolytes with thickness in a range between 0.1 to 5ƒÝm were fabricated on 10 yttrium stabilised zirconium (10YSZ) substrates by using a RF magnetron sputterer. The primary parameters controlling 10GDC thin film deposition using this method were explored in order to identify optimal conditions. The fabricated films were subsequently analysed for their morphology, composition and stoichiometry using a variety of methods, including Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectrometry (EDS), optical microscopy, X-ray Photoelectron Spectroscopy (XPS), and X-ray Diffraction (XRD). A preliminary test was conducted in order to examine the function of 10GDC thin film electrolytes together with the cathode and anode substrates at intermediate temperatures (700oC). A complete planar single cell was designed and assembled for this purpose. However, when fully assembled and tested, the cell failed to generate any voltage or current. Consequently, the remainder of the PhD work was focused on systematically exploring the factors contributing to the assembled fuel cell failure. As fabrication failure analysis is seldom reported in the scientific literature, this analysis represents a significant scientific contribution. This analysis proceeded in a series of steps that involved several different methods, including SEM, red dye analysis, surface morphology and cross section analysis of the cell. It was found that pinholes and cracks were present during the fuel cell operating test. Cathode delamination was also found to have occurred during the test operation. This was determined to be due to thermal expansion mismatch between the cathode substrate and the 10GDC electrolyte thin film. A series of suggestions for future research are presented in the conclusion of this work.
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Stefanik, Todd Stanley 1973. "The effect of oxygen partial pressure on the epitaxy of cerium oxide films deposited on nickel substrates." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/47650.

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James, Jemy. "Refractive index engineering using polymer nanocomposites Surface engineering of polystyrene–cerium oxide nanocomposite thin films for refractive index enhancement." Thesis, Lorient, 2019. http://www.theses.fr/2019LORIS552.

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À travers l’histoire, la lumière a suscité le plus vif intérêt chez de nombreuses personnes curieuses, qu’il s’agisse de philosophes questionnant sa nature ou de scientifiques cherchant à interpréter les phénomènes qui lui sont associés. L’optique joue un rôle essentiel dans nombre de nos applications quotidiennes. L’indice de réfraction est l’un des facteurs les plus importants en photonique. Il est possible d’améliorer l’efficacité des dispositifs photoniques, comme les diodes électroluminescentes, les cellules photovoltaïques, etc., en réduisant la disparité des indices de réfraction des matériaux utilisés dans les dispositifs optiques. Cette thèse apporte quelques éclaircissements sur l’adaptation de l’indice de réfraction des matériaux, détaillant des aspects de l’indice de réfraction et de son ingénierie à l’aide de nanocomposites de polymère. Ce chapitre d’introduction évolue vers une discussion plus large sur l’indice de réfraction, ses différentes valeurs, et les avantages potentiels que son ingénierie pourrait générer. De minces films polymères ont été préparés et les nanoparticules ont été introduites de façon à modifier l’indice de réfraction. De la même manière, des films épais ont été préparés en utilisant du PMMA et du polystyrène, ceux-ci ayant été utilisés pour caractériser optiquement et morphologiquement les échantillons préparés. De nombreuses méthodes ont été employées pour préparer les films polymères. Des films polymères ultraminces ont également été préparés en utilisant la technique de revêtement par centrifugation, puis l’épaisseur du film de polystyrène a été modifiée afin d’étudier son impact sur l’indice de réfraction. Il a fallu surmonter plusieurs obstacles lors des recherches, comme la préparation d’un substrat ultra pur, l’uniformité du film polymère mince préparé, l’adhérence du film polymère mince sur les substrats après le coulage au solvant, etc. Tous ces défis ont été relevés grâce aux innovations détaillées dans cette thèse
Historically, light was a centre of interest for numerous inquisitive people: the philosophers who were interested in its nature and the scientists who wanted to interpret its associated phenomena. Optics is playing a pivotal role in many of our day to day applications.The refractive index is one of the most significant parameters in photonics. An increase in the efficiency of the photonic devices, like Light Emitting Diodes, Solar Cells, etc., can be achieved by reducing the refractive index mismatch of materials used in the optical devices.This thesis throws some light into the tailoring the refractive index of materials, by giving detailed aspects of refractive index and engineering of the refractive index using polymer nanocomposite. This introductory chapter evolves into a wider discussion on the refractive index and the types of refractive index and the potential leverage that can be obtained by engineering the refractive index. Polymer thin films were prepared and the nanoparticles were introduced so as to modify the refractive index. Similarly, thick polymer films were prepared using PMMA and Polystyrene and these were utilized to optically and morphologically characterize the prepared samples. Multiple methods have been utilized to prepare the polymer films. Ultra thin polymer films were also prepared using the spin coating technique and later the thickness of the polystyrene film was changed so as to understand its impact on the refractive index. There were multiple challenges to overcome while carrying out the research like the preparation of ultra pure substrate, uniformity in the prepared polymer thin film, adherence of the polymer thin film on to the substrates after solvent casting etc. All the challenges were overcome using the innovations, which are detailed in the thesis
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Weimmerskirch, Jennifer. "Propriétés de luminescence et caractérisation structurale de films minces d'oxydes de silicium dopés au cérium et codopés cérium-ytterbium." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0180/document.

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Ce travail de thèse concerne l’élaboration et la caractérisation chimique et structurale de couches minces d’oxyde de silicium dopées avec des terres rares ainsi que l’étude de leurs propriétés de photoluminescence. Les films sont dopées avec du cérium. Le co-dopage cérium et ytterbium est également étudié dans le cas des couches de SiO2. Il est montré que dans les oxydes de composition SiO1, le cérium joue un rôle important dans la structure et l’organisation chimique de l’oxyde, notamment en favorisant la démixtion de l’oxyde. L’exposition à un faisceau laser focalisé engendre une démixtion locale favorisée par le cérium. Pour les films minces de SiO1,5 contenant à la fois du cérium et des nanocristaux de silicium, les différentes étapes de la séparation de phase entre nanocristaux de Si et agrégats riches en Ce ont été mises en évidence, notamment par sonde atomique tomographique et par microscopie électronique à balayage en transmission. Les propriétés de luminescence des dopants sont discutées en lien avec la microstructure de la matrice hôte. Pour tous ces systèmes, la formation d’un silicate de cérium de composition Ce2Si2O7 à haute température (> 1100°C) a été mise en évidence. Le cérium présent sous forme d’ions isolés ou dans un silicate émet intensément dans le bleu (400 nm) à température ambiante ce qui pourrait être intéressant pour le développement de diodes bleues en filière Si. Enfin, un transfert d’énergie des ions Ce3+ vers les ions Yb3+ a été mis en évidence dans les films minces de SiO2 ouvrant ainsi la voie à de possibles applications dans le domaine du solaire photovoltaïque
This thesis concerns the structural characterization and the photoluminescence properties of thin silicon oxide films doped with rare earths The films are doped with cerium. The co-doping with both cerium and ytterbium is also studied in the case of SiO 2 layers. It is shown that in oxides with composition SiO1, cerium plays an important role in the structure and chemical organization of the oxide, in particular by promoting phase separation of the oxide. The exposure to a focused laser beam generates a local demixtion favored by cerium. For thin SiO1,5 films containing both cerium and silicon nanocrystals, we are able to follow the phase separation occuring between Si nanocrystals and Ce rich aggregates using both atom probe tomography and scanning transmission electron microscopy. The luminescence properties of dopants are discussed in connection with the microstructure of the host matrix. For all these systems, the formation of a cerium silicate with composition Ce2Si2O7 is observed at high temperature (> 1100 ° C). The cerium present either as isolated Ce3+ ions or in a silicate emits intensely at 400 nm (blue) at room temperature, which might be of interest for the development of blue light emitting diodes fully compatible with the Si technology. Finally, an energy transfer from Ce3+ ions to Yb3+ ions is demonstrated in thin SiO2 films opening the route to possible applications in the field of photovoltaics
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Books on the topic "Cerium oxide films"

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Al-Dhhan, Ziad Tarik. Dielectric properties of thin films based on cerium oxide (CeO2). Uxbridge: Brunel University, 1988.

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Mian, Abdul Razzaq. Some electronic properties of thin dielectric oxide films containing cerium, niobium, vanadium and silicon. Uxbridge: Brunel University, 1988.

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Book chapters on the topic "Cerium oxide films"

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Develos-Bagarinao, Katherine. "Nanostructured Cerium Oxide Films: Synthesis, Properties, and Applications." In Oxide Thin Films, Multilayers, and Nanocomposites, 213–35. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14478-8_11.

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Dansoh, V., F. Gertz, J. Gump, A. Johnson, J. I. Jung, M. Klingensmith, Y. Liu, et al. "Cerium Oxide Thin Films via Ion Assisted Electron Beam Deposition." In Advanced Ceramic Coatings and Interfaces III, 85–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470456323.ch7.

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Jing, Feng Juan, Lu Wang, Y. W. Liu, J. Y. Cheng, Yong Xiang Leng, R. K. Y. Fu, X. B. Zhao, Paul K. Chu, and Nan Huang. "Biocompatibility of Cerium Oxide Films Synthesized by Dual Plasma Deposition." In Key Engineering Materials, 749–52. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-422-7.749.

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Kainbayev, Nursultan, Mantas Sriubas, Zivile Rutkuniene, Kristina Bockute, Saltanat Bolegenova, and Giedrius Laukaitis. "Formation and Investigation of Doped Cerium Oxide Thin Films Formed Using E-Beam Deposition Technique." In Recent Advances in Technology Research and Education, 28–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99834-3_4.

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Lai, Bo-Kuai, A. C. Johnson, H. Xiong, C. Ko, and S. Ramanathan. "Exploratory Studies on Silicon-Based Oxide Fuel Cell Power Sources Incorporating Ultrathin Nanostructured Platinum and Cerium Oxide Films as Anode Components." In Future Trends in Microelectronics, 411–22. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470649343.ch34.

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Van Gestel, Tim, Hyo-Jeong Moon, Doris Sebold, Sven Uhlenbruck, and Hans Peter Buchkremer. "Processing of Gadolinium-Doped Ceria Electrolyte Layers with a Thickness of ∼1 MM: Thin Film Wet Coating Methods and PVD." In Advances in Solid Oxide Fuel Cells VIII, 145–57. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118217481.ch14.

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Abreu, C. M., M. J. Cristóbal, X. R. Nóvoa, G. Pena, M. C. Pérez, and C. Serra. "The effect of the Cerium ion implantation in the passive films properties of a duplex stainless steel." In Passivation of Metals and Semiconductors, and Properties of Thin Oxide Layers, 47–52. Elsevier, 2006. http://dx.doi.org/10.1016/b978-044452224-5/50008-1.

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Conference papers on the topic "Cerium oxide films"

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Varsano, Francesca, A. V. Krasilnikova, Franco Decker, and Enrico Masetti. "Optical characterization of cerium-vanadium mixed oxide films for electrochromic devices." In Optical Systems Design and Production, edited by Claude Amra and H. Angus Macleod. SPIE, 1999. http://dx.doi.org/10.1117/12.360069.

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Wang, Kai, Alla Reznik, and Karim S. Karim. "Fabrication and characterization of cerium oxide thin films for ultraviolet sensing applications." In SPIE Optical Engineering + Applications, edited by Joseph L. Robichaud and William A. Goodman. SPIE, 2009. http://dx.doi.org/10.1117/12.827418.

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Maksimchuk, N. V., and A. V. Borisov. "Nanocrystalline cerium oxide films as a functional material for photodetectors of bioluminescent signal." In 2013 IEEE XXXIII International Scientific Conference on Electronics and Nanotechnology (ELNANO 2013). IEEE, 2013. http://dx.doi.org/10.1109/elnano.2013.6552034.

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Zafirova, M. I., A. V. Myshkina, and I. N. Bazhukova. "Producing and studying the optical properties of films based on cerium oxide nanoparticles." In THE VII INTERNATIONAL YOUNG RESEARCHERS’ CONFERENCE – PHYSICS, TECHNOLOGY, INNOVATIONS (PTI-2020). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0035285.

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Schröder, S., and H. Fritze. "A.4.4 - Langasite-based Microbalance for Determination of the Non-stoichiometry in Praseodymium-Cerium Oxide Thin Films at Elevated Temperatures." In AMA Conferences 2017. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2017. http://dx.doi.org/10.5162/sensor2017/a4.4.

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Hassebrook, Anton, Michael J. Lucis, Jeffrey E. Shield, Craig Zuhlke, Troy Anderson, Dennis Alexander, George Gogos, and Sidy Ndao. "Thermal Stability of Rare Earth Oxide Coated Superhydrophobic Microstructured Metallic Surfaces." In ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48459.

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Abstract:
In this paper, we present a method of generating nearly superhydrophobic surfaces from Femtosecond Laser Surface Processed (FLSP) metallic substrates and the study of their thermal stability at high temperatures. Using an FLSP process, hierarchical micro/nano structures were fabricated on stainless steel 316 after which a 200 nm Cerium Oxide (CeO2) film was sputtered onto the surface. Before CeO2 deposition, the contact angle of sample was measured. Post CeO2 deposition, the contact angles were measured again. As a result of the cerium oxide deposition, the contact angle of the originally hydrophilic FLSP surface turned near superhydrophobic with an equilibrium contact angle of approximately 140°. Subsequently, the coated surfaces were annealed in air. The surface maintained its high contact angle from room temperature to about 160°C, after which it lost its hydrophobicity due to hydrocarbon burn off. For each annealing temperature, we monitored the chemical composition for the cerium oxide-coated FLSP surface using energy dispersive x-ray spectroscopy (EDS) and X-ray diffraction (XRD). Under a nitrogen rich annealing environment, the nearly superhydrophobic FLSP metallic surface maintained its high contact angle up to temperatures as high as 350°C. To further understand the physics behind the observed phenomenon, we investigated two additional samples of polished stainless steel 310 again coated with 200 nm of CeO2.
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Lim, Way Foong, and Kuan Yew Cheong. "Influence of post-deposition annealing on metal-organic decomposed lanthanum cerium oxide film." In 2012 International Conference on Enabling Science and Nanotechnology (ESciNano). IEEE, 2012. http://dx.doi.org/10.1109/escinano.2012.6149687.

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Lim, Way Foong, Zainovia Lockman, and Kuan Yew Cheong. "Influence of post-deposition annealing on metal-organic decomposed lanthanum cerium oxide film." In 2011 IEEE Regional Symposium on Micro and Nanoelectronics (RSM). IEEE, 2011. http://dx.doi.org/10.1109/rsm.2011.6088283.

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Chougule, M. "GS5.4 - Cerium Oxide-based Nanoparticles Thin Film: Sensitive and Selective for detection of NO2 gas." In 17th International Meeting on Chemical Sensors - IMCS 2018. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2018. http://dx.doi.org/10.5162/imcs2018/gs5.4.

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Lin, H., C. Ding, K. Kumada, K. Sato, Y. Tsutai, C. Wada, T. Hashida, Kazuyuki Tohji, Noriyoshi Tsuchiya, and Balachandran Jeyadevan. "Ni-GDC Anode-Supported Ceria Electrolyte Film and Its Application in Solid Oxide Fuel Cells." In 2007. AIP, 2008. http://dx.doi.org/10.1063/1.2896978.

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Reports on the topic "Cerium oxide films"

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Haridoss, P., E. Hellstrom, F. H. Garzon, D. R. Brown, and M. Hawley. Thin film ionic conductors based on cerium oxide. Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/10103830.

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