Photon-assisted oxidation and oxide thin film synthesis: A review

Tsuchiya, Masaru; Sankaranarayanan, Subramanian K. R. S.; Ramanathan, Shriram

doi:10.1016/j.pmatsci.2009.04.003

Cited by 71 publications

(37 citation statements)

References 241 publications

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“…In addition, the 254 nm line rapidly decomposes O 3 into molecular oxygen ͑O 2 ͒ and atomic oxygen. 16 In the current work, the intensity at 254 nm for a 4 ϫ 4 Grid Lamp located at 5 cm distance corresponds to ϳ17 mW/ cm 2 . The intensity at 254 nm line is typically about 4-10 times that at 185 nm line.…”

Section: Photon Sourcementioning

confidence: 69%

“…16 To take advantage of the photochemical reactions leading to O 2 dissociation, a widely used light source for oxygen photochemistry is the low pressure ͑Ͻ0.1 Torr͒ mercury lamp ͑185 and 254 nm͒. The use of UV range photons is an attractive option to create active oxygen species such as oxygen radicals and has been used in this study.…”

Section: Photon Sourcementioning

confidence: 99%

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Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

et al. 2010

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We report on the ability to modify the structure and composition of ultrathin oxides grown on Ni and Ni-Al alloy surfaces at room temperature utilizing photon illumination. We find that the nickel-oxide formation is enhanced in the case of oxidation under photo-excitation. The enhanced oxidation kinetics of nickel in 5% Ni-Al alloy is corroborated by experimental and simulation studies of natural and photon-assisted oxide growth on pure Ni͑100͒ surfaces. In case of pure Ni substrates, combined x-ray photoelectron spectroscopy analysis, and atomic force microscope current mapping support the deterministic role of the structure of nickel passiveoxide films on their nanoscale corrosion resistance. Atomistic simulations involving dynamic charge transfer predict that the applied electric field overcomes the activation-energy barrier for ionic migration, leading to enhanced oxygen incorporation into the oxide, enabling us to tune the mixed-oxide composition at atomic length scales. Atomic scale control of ultrathin oxide structure and morphology in the case of pure substrates as well as compositional tuning of complex oxide in the case of alloys leads to excellent passivity as verified from potentiodynamic polarization experiments.

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Section: Photon Sourcementioning

confidence: 69%

Section: Photon Sourcementioning

confidence: 99%

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

et al. 2010

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“…It appears that, while the number of publications dealing with zirconia is large, many of them only focus on pure ZrO 2 , 14,15 or present results on just one stoichiometry of yttria-stabilized zirconia. 16,17 In many cases, supported films and not free-standing ones (as in our case) are used. 16 To the best of our knowledge, there have been no systematic studies regarding the Y-influence over a wider stoichiometry range, but only for limited compositional variations such as in Ref.…”

Section: Introductionmentioning

confidence: 99%

From zirconia to yttria: Sampling the YSZ phase diagram using sputter-deposited thin films

et al. 2016

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Yttria-stabilized zirconia (YSZ) thin films with varying composition between 3 mol% and 40 mol% have been prepared by direct-current ion beam sputtering at a substrate temperature of 300 °C, with ideal transfer of the stoichiometry from the target to the thin film and a high degree of homogeneity, as determined by X-ray photoelectron and energy-dispersive X-ray spectroscopy. The films were analyzed using transmission electron microscopy, revealing that, while the films with 8 mol% and 20 mol% yttria retain their crystal structure from the bulk compound (tetragonal and cubic, respectively), those with 3 mol% and 40 mol% Y2O3 undergo a phase transition upon sputtering (from a tetragonal/monoclinic mixture to purely tetragonal YSZ, and from a rhombohedral structure to a cubic one, respectively). Selected area electron diffraction shows a strong texturing for the three samples with lower yttria-content, while the one with 40 mol% Y2O3 is fully disordered, owing to the phase transition. Additionally, AFM topology images show somewhat similar structures up to 20 mol% yttria, while the specimen with the highest amount of dopant features a lower roughness. In order to facilitate the discussion of the phases present for each sample, a thorough review of previously published phase diagrams is presented.

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“…[1][2][3] Many routes to achieving nanoscale materials with different morphologies, including wires, particles, and thin films, to mention only a few, have been reported in the literature. [4][5][6] Among them are solution-processing routes such as solvothermal and sol-gel methods, physical deposition techniques, mechanochemical approaches, and others. [7][8][9][10][11] As for thin films, materials with a perpendicular magnetic anisotropy have been the subject of significant interest over the past decade due to their potential for application in nanomagnetics [12][13][14] (e.g., as storage/recording media) and spintronics [15][16][17] (e.g., as spin valves).…”

Section: Introductionmentioning

confidence: 99%

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

et al. 2014

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We report the evaporation-induced self-assembly synthesis of large-pore mesoporous thin films of ferrimagnetic holmium iron garnet (Ho 3 Fe 5 O 12 ) from nitrate salt precursors and a polyisobutylene-block-poly(ethylene oxide) polymer structure-directing agent. The phase composition, atomic bonding configuration, and pore structure at the top surface and in the interior of the films were investigated by microscopy, scattering, and spectroscopy techniques, including synchrotron-based grazing incidence small-angle X-ray scattering, X-ray photoelectron spectroscopy, X-ray diffraction (including Rietveld refinement), and others. The data provide evidence that the sol-gel derived material is single phase garnet with 27 nm diameter crystallites and few defects after heating to 850 °C in air and the continuous network of pores averaging 23 nm in diameter is preserved to a large extent, despite a solid-solid conversion from metastable h- KeywordsRare-earth iron garnet, magnetic anisotropy, out-of-plane easy axis, sol-gel chemistry, selfassembly 3

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Photon-assisted oxidation and oxide thin film synthesis: A review

Cited by 71 publications

References 241 publications

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

From zirconia to yttria: Sampling the YSZ phase diagram using sputter-deposited thin films

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

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Photon-assisted oxidation and oxide thin film synthesis: A review

Cited by 71 publications

References 241 publications

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

From zirconia to yttria: Sampling the YSZ phase diagram using sputter-deposited thin films

Large-Pore Mesoporous Ho3Fe5O12 Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

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Product

Resources

About

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing