Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"secondary ion mass spectroscopy"”.
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In Situ Infrared Spectroscopic Studies of Electrodeposition Additive Adsorption on Copper
CTA with bisulfate counterion promoted smooth electrodeposits. Secondary ion mass spectroscopy (SIMS) depth profiles indicated that CTA was not significantly incorporated into copper deposits grown in the presence of CTA with HSO$\sb4\sp-$ counterion, except at very high overpotentials ($>$500 mV). …
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Growth of Wurtzite Gallium Nitride Epitaxial Films on Sapphire Substrate by Reactive Molecular Beam Epitaxy and Material Characterization
… with high electron Hall mobility. X-ray diffraction (XRD), photoluminescence (PL), cross-sectional transmission microscopy (XTEM) and deep level transient spectroscopy (DLTS) results also show consistency with electrical results. For the growth of Mg-doped GaN films, larger ammonia flow rates …
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Impurity-induced layer disordering of quantum well heterostructures by silicon diffusion from aluminum-reduced silicon dioxide and silicon nitride
… disordering (IILD) utilizing the chemical reduction of SiO$\sb2$ by Al (from high-percentage Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As) is employed to produce Si and O to effect layer disordering. This diffusion process is examined using secondary ion mass spectroscopy (SIMS) for both closed and open-tube …
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Microstructure, residual stress, and mechanical properties of thin film materials for a microfabricated solid oxide fuel cell
… Much of the work focuses on the characterization of a candidate solid electrolyte: Yttria Stabilized Zirconia (YSZ). Stress and structure of reactive RF sputtered YSZ films are explored as a function of thickness (5nm - 1000nm), deposition pressure (5mtorr - 1OOmtorr), and substrate …
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Microstructural Evolution in Mocvd-Derived Tantalum-Doped Tin Dioxide Thin Films and Subsequent Property Changes
… the metal-organic chemical vapor deposition (MOCVD) technique. The main focus of this study was to understand the structure-property relationship in the Ta-Sn-O material system. Microstructure of the films was characterized through x-ray diffraction (XRD), secondary ion mass spectroscopy …
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Hydrophobic, fluorinated silica xerogel for low-k applications.
… improved properties. Hydrolysis and condensation of dimethyldiethoxysilane (DMDES) (solvent (EtOH) to DMDES molar ratio R = 4, water to DMDES molar ratio r = 4, 0.01 N HCl catalyst) was analyzed using high-resolution liquid 29Si NMR. It was found that after several hours, DMDES hydrolyzed and …
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Output Characteristics and High-Speed Modulation of Composite -Resonator Vertical -Cavity Lasers
In this dissertation, the novel output characteristics of the CRVCL are explored with the goal of understanding the high-speed direct modulation of these devices from theoretical and experimental perspectives. The epitaxial structure is considered and one dimensional simulations of the mode profile …
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Characterization of S-bend optical waveguides fabricated by impurity- and vacancy-induced layer disordering
… raised-cosine S-bend geometries. The 3-dB transition length for a 100 $\mu$m offset S-bend waveguides fabricated using the Zn, SiO$\sb2$, or In/SiO$\sb2$ IILD process is less than 300 $\mu$m for near single-mode guides. In addition, vacancy-induced layer disordering (VILD) of the native …
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Development and optimisation of supercritical fluid deposition of semiconductor films
This thesis is concerned with the deposition, and characterisation, of semiconductor thin films and microstructures deposited from a supercritical fluid. Thin films of CdS, GaP, InP, InAs, and Ge were deposited using supercritical CO<sub>2</sub> and CO<sub>2</sub>-solvent mixtures. Ge was deposited …
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X-ray photoelectron spectroscopy (XPS) study of single crystal UO2 and U3O8 on r-plane sapphire and yttrium stabilized zirconium (YSZ) substrates
… our thin films using X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), Rutherford Backscattering Spectroscopy (RBS), and Secondary Ion Mass Spectroscopy (SIMS). This thesis will primarily focus on the growth of the thin films, and the analyzed results from X-ray …
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Are 'exceptionally' preserved skeletal fossils necessarily exceptional chemically and cytologically?
… scale, vertebrate fossils are considered exceptional when non-biomineralized (soft) tissues are preserved. Histologically, high quality is defined by trueness to original shape of a bone, preservation of fine details (e.g. canaliculi), and presence or absence of matrix material in void spaces. …
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Magnetic Properties Of Sputter Deposited Fe-based Amorphous Thin Films For Resonator Application
… including induced anisotropy and magnetostriction, of the as-deposited and annealed films using an M-H Looper. The chemical composition of the films was characterized using secondary ion mass spectroscopy (SIMS). The physical thickness of the films was determined by use of a stylus …
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Experimental determination of the thermoelectric properties of porous silicon nanowires
… silicon have attracted significant attention in recent work. The objective is to reduce thermal conductivity through the introduction of phonon scattering mechanisms while preserving charge transport. Initial reports on electrolessly etched silicon nanowires and periodic \holey"" silicon …
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Radiation-enhanced diffusion of oxygen-18 in uranium dioxide thin films
Anion radiation enhanced diffusion (RED) and thermal diffusion of a buried 18O tracer layer in thin film UO2 was measured using Secondary-Ion Mass Spectroscopy (SIMS). Thin films were grown using a dedicated magnetron sputtering chamber. Samples were irradiated with 1.8 MeV Kr+ over a temperature …
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Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies.
… potential candidates to replace SiO2 or SiON as the gate dielectric in CMOS processing. Furthermore, the addition of nitrogen into this pseudo-binary alloy has been shown to improve their thermal stability, electrical properties, and reduce dopant penetration. Because CMOS processing …
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Three-dimensional electronic resistivity mapping of solid electrolyte interphase and anode active material in lithium-ion batteries
Silicon is a promising candidate for the lithium ion battery anode because of the order-of-magnitude improvement in gravimetric energy density over current state-of-the-art graphite anodes. In systems featuring both C and Si anodes, electronic resistivity of the solid-electrolyte interphase (SEI) …
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Adsorption of cobalt on gamma-Fe{u2082}O{u2083}
… material for magnetic recording. The preparation of cobalt-doped gamma-Fe₂O₃ consists of interacting Co(II) with particulate gamma-Fe₂O₃ in solution under alkaline conditions. The surface of cobalt-treated gamma-Fe₂O₃ was characterized using the surface analysis techniques of x-ray …
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Synthesis and characterization of tethered poly(n-isopropylacrylamide) for quantitative cell adhesion studies
… above and below its lower critical solution temperature (LCST ~ 32\uf0b0C). This thesis reports on grafted PNIPAAm brushes, synthesized using a relatively simple and rapid method which allows atom transfer radical polymerization (ATRP) in presence of air. In this study the structure, …
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A multi-process reactor for thin film transistor fabrication at low temperatures
… have a vast potential in a wide range of applications including, flat panel displays, large area electronics and 3D integrated circuits. This thesis describes advances made in the technology for the fabrication of TFT's. A Multi-Process reactor has been designed to produce device quality layers on …
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