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 59 for “"high-resolution transmission electron microscopy ("”.
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Quantitative high resolution transmission electron microscopy
High resolution transmission electron microscopy (HRTEM) has been extensively used as a structure characterization technique in materials and biological science. In the past, qualitative use of HRTEM has been primarily employed.
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High-resolution transmission electron microscopy of III-V FinFETs
… technology due to their outstanding electron transport properties. InGaAs n-channel metal-oxide-semiconductor field-effect transistors have already demonstrated promising characteristics, and the antimonide material system is emerging as a candidate for p-channel devices. As …
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Stochastic Space-Charge in Projection Electron Lithography and High Resolution Transmission Electron Microscopy
… a specific effect, the degradation in image resolution, as observed in two advanced technologies: SCattering with Angular Limitation Projection Electron Lithography (SCALPEL) and High-Resolution Transmission Electron Microscopy (HRTEM). These particular technologies were chosen for their …
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Effect of electric fields on the synthesis of nanoparticles of tin and silicon in a liquid environment
… forming a plasma plume which contains ions, electrons, nanoparticles, and nano clusters. High pressures, high temperatures and high energy densities are created in this method. These conditions are favorable for the formation of metastable phases resulting in novel products depending on the …
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A Nano-Scale Chemical and Structural Characterization of Chinook Salmon (Oncorhynchus tshawytscha) Otoliths Using a FIB and HRTEM
… was characterized in thin section using scanning electron microscopy (SEM) in conjunction with cathodoluminescence (CL) and high resolution transmission electron microscopy (HRTEM). The results constrained the relative distribution of several elements; silicon-enriched nodules were found in the …
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The geochemistry of gold-bearing and gold-free pyrite and marcasite from the Getchell gold deposit, Humboldt County, Nevada
… As and Au in ore-stage Fe-sulfide minerals. High-resolution transmission electron microscopy analyses revealed that gold-bearing Fe-sulfide crystals are arsenic-rich marcasite, rather than pyrite. These analyses failed to identify gold as microinclusions in ore-stage pyrite/marcasite, and …
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Power Electronics Based on Ultrawide Bandgap Semiconductors: from Material Engineering to Device Applications
This work demonstrates high-performance BN/β-Ga2O3 metal-insulator-semiconductor Schottky barrier diodes (MIS SBDs). The BN layer is directly grown on the β-Ga2O3 by pulsed laser deposition (PLD). The presence of a ~2.8 nm BN layer is confirmed by a series of techniques, including X-ray …
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Surface structural changes of perovskite oxides during oxygen evolution in alkaline electrolyte
… reported to date. In this work it is shown via high resolution transmission electron microscopy (HRTEM) and Raman spectroscopy that oxides such as BSCF82 rapidly undergoes amorphization at its surface under OER conditions, which occurs simultaneously with an increase in the pseudocapacitive …
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Deposition and Characterization of Silicon Nitride/gallium Arsenide Metal Insulator Semiconductor Structures With Heteroepitaxial Interlayers
… by in situ analyses such as reflection high electron energy diffraction, scanning tunneling microscopy, and x-ray photoelectron spectroscopy as well as ex situ spectroscopic ellipsometry and high resolution transmission electron microscopy measurements. The culmination of this work is …
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Microstructural Evolution in Mocvd-Derived Tantalum-Doped Tin Dioxide Thin Films and Subsequent Property Changes
… secondary ion mass spectroscopy (SIMS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Electrical properties were studied using four-point probe resistivity and Hall measurement. Optical transparency was …
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Interfacial Structures of Oxides on GaAs
… both n- and p-channel enhancement GaAs MOSFETs. High-resolution transmission electron microscopy (HRTEM) indicates that deposition of MgO, Al$\sb2$O$\sb3$, and Ga$\sb2$O$\sb3$, fail to yield a truly amorphous oxide. Although deposition of SiO$\sb2$ results in an amorphous oxide. There lacks a …
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Synthesis of organically capped and water soluble metal sulfide semiconductor nanoparticles
… synthesized using a hybrid solution based high temperature colloidal route in the presence of organic surfactants as both stabilizers and crystal growth modifiers. The structure and morphology of the as-prepared metal sulfide nanoparticles were characterized by X-ray diffraction (XRD), …
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Structural and morphological characterization of hydrozincite and its interaction with organic molecules
… Nuclear Magnetic Resonance (NMR), Scanning Electron Microscopy (SEM), and High-Resolution Transmission Electron Microscopy (HR-TEM) and the organic matrix present has been extracted and characterized by using Fourier Transform Infrared (FT-IR). In the context of molecular interactions at …
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Electronic properties and microstructure of nanoparticulate silicon systems for diode applications
In printed electronics the use of semiconducting silicon nanoparticles allows more than the simple printing of conductive materials. It gives the possibility of fabricating robust and inexpensive, active components. This work presents the design, fabrication, and characterization of Schottky …
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Combustion synthesis of fullerenes and fullerenic nanostructures
… pressure, residence time, and equivalence ratio. High-resolution transmission electron microscopy (HRTEM) showed that the soot contains nanostructures, including onions and nanotubes. Although flame conditions for forming fullerenes have been identified, the process has not been optimized and many …
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Resolving the Structure, Morphology, and Trace Metal Association of Nanominerals: The Case for Schwertmannite
… mineral typically found under acidic, high sulfate and iron aqueous conditions, such as acid mine drainage environments, was studied using analytical high resolution transmission electron microscopy (HRTEM). HRTEM offers advantages over bulk techniques such as powder x-ray diffraction …
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Multivariate Analysis of Factors Regulating the Formation of Synthetic Allophane and Imogolite Nanoparticles
… allophane are nanosized aluminosilicates with high value in industrial and technological applications, however it remains unclear what factors control their formation and abundance in nature and in the lab. This work investigated the complex system of physical and chemical conditions that …
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Synthesis and Fabrication of Alpha Phase Iron Oxide (α-Fe2O3) Nanostructured doped with Ruthenium for Highly Sensitive and Selective Flammable and Toxic Gas Sensor
… thermogravimetric analysis, x-ray photoelectron spectroscopy, Brunauer-emmett-teller surface area analysis, scanning electron microscopy, and high-resolution transmission electron microscopy, to study certain properties of the material. The sensors were fabricated by using the drop …
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Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies.
… penetration. Because CMOS processing requires high temperature anneals (up to 1050 °C), it is important to understand the diffusion properties of any metal associated with the gate dielectric in silicon at these temperatures. In addition, dopant penetration from the doped polysilicon gate into …
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Synthesis, Characterisation and Functionalisation of CdSe Quantum Dots
… (CVD). This thesis focuses on the synthesis of high-quality CdSe nanocrystals through a bench- top colloidal synthesis paying particular attention to the effects of varying the reaction temperature and reagent concentrations on the size and crystallinity of the QDs. Powder X-ray diffraction …
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