Synthesis and Characterization of Pure and Doped Ceria Films by Sol-Gel and Sputtering PDF Download
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Languages : en
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Pure and doped Ceria are known for their ability to gain or lose Oxygen, which is of interest to the Solid Oxide Fuel Cell (SOFC) and catalyst community. Current efforts are focused in SOFCs to reduce the operating temperature of the cell while maintaining ionic conduction. Ceria is known for its high ionic conductivity in the intermediate temperature region. (600-800° C) We have prepared pure and doped Ceria films by Sol-gel and magnetron sputtering methods. Enhanced grain-boundary contribution in the conductivity can be studied in the Sol-gel process due to excellent control over the synthesis conditions, which enabled us to control the average grain size. Sputtered films were grown and investigated as a prelude to possible multi-layered CeO2 structures in the near future. These films were characterized by X-ray diffraction (XRD), nuclear reaction analysis (NRA), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and Oxygen conduction measurements. We have observed greater volume diffusion in nanocrystalline Ceria compared to bulk polycrystalline films as a result of low density. Near surface diffusion properties with increasing temperature indicate a decrease in the volume diffusion as a result of grain growth. However, a linear increase in O2 content at 6̃00nm depth was observed and can be correlated to the redistribution of O2 in the samples. Surface roughness of 111 and 200 oriented Ceria films on Al2O3 and YSZ was observed to be 0.13nm and 0.397nm, respectively. In the case of Ceria grown on YSZ, structural properties from XRD results showed a highly oriented structure with cube on cube growth. XRD results from Ceria grown on Al2O3 showed an oriented structure whose degree of orientation appeared to be partially dependent on substrate temperature. Preliminary XPS results indicate reduction in Ceria from the Ce4+ to Ce3+ state near the surface.
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Category :
Languages : en
Pages :
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Book Description
Pure and doped Ceria are known for their ability to gain or lose Oxygen, which is of interest to the Solid Oxide Fuel Cell (SOFC) and catalyst community. Current efforts are focused in SOFCs to reduce the operating temperature of the cell while maintaining ionic conduction. Ceria is known for its high ionic conductivity in the intermediate temperature region. (600-800° C) We have prepared pure and doped Ceria films by Sol-gel and magnetron sputtering methods. Enhanced grain-boundary contribution in the conductivity can be studied in the Sol-gel process due to excellent control over the synthesis conditions, which enabled us to control the average grain size. Sputtered films were grown and investigated as a prelude to possible multi-layered CeO2 structures in the near future. These films were characterized by X-ray diffraction (XRD), nuclear reaction analysis (NRA), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and Oxygen conduction measurements. We have observed greater volume diffusion in nanocrystalline Ceria compared to bulk polycrystalline films as a result of low density. Near surface diffusion properties with increasing temperature indicate a decrease in the volume diffusion as a result of grain growth. However, a linear increase in O2 content at 6̃00nm depth was observed and can be correlated to the redistribution of O2 in the samples. Surface roughness of 111 and 200 oriented Ceria films on Al2O3 and YSZ was observed to be 0.13nm and 0.397nm, respectively. In the case of Ceria grown on YSZ, structural properties from XRD results showed a highly oriented structure with cube on cube growth. XRD results from Ceria grown on Al2O3 showed an oriented structure whose degree of orientation appeared to be partially dependent on substrate temperature. Preliminary XPS results indicate reduction in Ceria from the Ce4+ to Ce3+ state near the surface.
Author: Per A. Askeland
Publisher:
ISBN:
Category : Metal catalysts
Languages : en
Pages : 260
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Author: Hai Tang
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Author: Bahadir Tunaboylu
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Author: Dr. B. Radhakrishna
Publisher: Lulu.com
ISBN: 0359510280
Category : Education
Languages : en
Pages : 132
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Book Description
Badeker in 1907 observed that some materials are optically transparent in the visible light and electrically conducting [1]. Because of the increasing interest in electrically and electronically active materials, the search for materials and the techniques for producing semi-transparent electrically conducting films have gained much importance. In an intrinsic stoichiometric material, it is not possible to have simultaneously high transparency (>80%%) in the visible region and high electrical conductivity (>103 Ω cm-1). A variety of metals in thin film form (
Author: Anirban Chowdhury
Publisher:
ISBN:
Category :
Languages : en
Pages : 334
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Author: Basim Abdullah AL-Farsi
Publisher:
ISBN:
Category : Thin films
Languages : en
Pages : 154
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Author: Lowell Ralph Matthews
Publisher:
ISBN:
Category :
Languages : en
Pages : 410
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Author: Pankaj Jyoti Hazarika
Publisher: ProQuest
ISBN: 9780549319801
Category : Materials science
Languages : en
Pages :
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Diamond like carbon (DLC) films have gained grounds in the biomedical field as an inert, biocompatible, low friction and wear resistant coating and are widely used in heart valves, coronary artery stents, dental implants, knee prosthesis and other vascular devices. In addition, Ag nanoparticles/films can prevent the formation of biofilm on biomedical implants by degrading the metabolic activities like permeability and respiration and also impair DNA replicability. Thus, Ag-doped DLC (Ag-DLC) can serve as a multifunctional bio coating combining desirable antibacterial and physical/mechanical characteristics. In the present study, Ag-DLC films were synthesized utilizing a hybrid Plasma CVD and Magnetron sputtering process in a CH4/Ar glow discharge. Nanocomposite films containing Ag nanoparticles in an amorphous DLC matrix with various amounts of Ag were synthesized and characterized by Transmission Electron Microscope (TEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). Tribological experiments were performed to assess the frictional behavior and wear resistance of the Ag-DLC films as a function of Ag content. Anodic polarization experiments were conducted to characterize the electrochemical behavior of the Ag-DLC films. TEM results revealed that Ag nanoparticles of 4-7 nm in size were uniformly distributed in an amorphous DLC matrix. Microhardness of DLC films exhibited a hardness of 22 GPa and it gradually decreased with increasing Ag content in the films. Wear rate of DLC film was 1.9 x 10-8 mm3/Nm and it increased to 8 x 10-7 mm3/Nm for Ag-DLC (5% Ag) film. Electrochemical behavior experiments showed that Ag-DLC films exhibited an inert behavior compared to the pure silver.
Author: Luis M. Liz-Marzán
Publisher: Springer Science & Business Media
ISBN: 0306481081
Category : Science
Languages : en
Pages : 506
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Book Description
Organized nanoassemblies of inorganic nanoparticles and organic molecules are building blocks of nanodevices, whether they are designed to perform molecular level computing, sense the environment or improve the catalytic properties of a material. The key to creation of these hybrid nanostructures lies in understanding the chemistry at a fundamental level. This book serves as a reference book for researchers by providing fundamental understanding of many nanoscopic materials.
