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 22 for “"atomically flat"”.
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GaN Epitaxy on Melt Grown Thermally Prepared Bulk ZnO Substrates
… substrate was achieved. ZnO substrates with an atomically flat surface exhibiting terrace-like features were used as a substrate for GaN grown by MBE. High-resolution x-ray diffraction and low temperature PL results show that similar high quality GaN layers can be achieved on both annealed …
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Molecular assemblies observed by atomic force microscopy
… a prerequisite, the proteins must be adsorbed to atomically flat mica and densely packed in a membrane to restrict their lateral mobility. Atomically flat gold, engineered proteins, and chemically modified lipids were combined to rapidly assemble immobile and fully oriented samples. The resulting …
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Selective area epitaxy of III-V nanowires: toward nanowire-on-silicon tandem solar cells
… results in impurity-free material with nearly atomically flat sidewalls formed on low index crystal facets. In this thesis, the SAE-NW growth technique is examined and progress in the field is reviewed. A study of the geometric evolution of SAE-NWs during growth is presented, followed by …
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Interactions between molecules and nanostructures using quartz crystal microbalance
… process is developed for the transfer of an atomically flat surface of gold onto a QCM Au electrode, the pressure-forming template stripped (PTS) technique. In Chapter 3, the PTS method is presented with the crucial parameters for obtaining an atomically flat gold surface on QCM resonators …
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Data-Driven Design of Spontaneously-Organized Super-Peptides on Atomic Single Layer Solids
… assemble and perform specific functions on atomically-flat material surfaces. As solid-state systems, single atomic layer materials, such as graphene and those that provide flat surfaces, such as quartz, have been chosen. Using these libraries, peptides that are capable of binding to their …
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Graphene characterization and device fabrication: doping analysis, strains engineering towards terahertz radiation
… achieved by using graphene encapsulated between atomically flat hBN layers as well as tuning surface hydrophobicity via substrate salinization. This also provides an improved method to optically determine charge density in graphene with order of magnitude enhancement in sensitivity.
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Single molecule optical absorption at room temperature detected by scanning tunneling microscopy
… to use arbitrary substrates - apart from being atomically flat and conductive they must also be optically transparent at the wavelength of excitation. Previous studies involved E11 absorption spectroscopy of carbon nanotubes (CNT) on silicon substrates. For further studies of SMA we have chosen …
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Scanning Tunneling Microscopy and Spectroscopy of Carbon Nanotubes Interfaced With Silicon Surfaces
… of SWNTs with minimal disruption of the atomically flat Si(100)-2x1:H surface. Isolated, rather than bundled, SWNTs could be routinely located on the surface for atomically resolved imaging, tunneling current-voltage spectroscopy, lateral manipulation, and cutting with the …
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Synthesis of 1T-Tantalum (IV) Sulfide and observation of charge density wave using scanning tunneling microscopy
… 1T-TaS2. The powder was deposited onto an atomically flat, H-passivated silicon substrate using dry contact transfer (DCT), an in-situ deposition technique developed by the Lyding group for clean, UHV-compatible transfer of nano-materials. We managed to directly observe room-temperature CDW …
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From purification, spectroscopy, and microscopy of carbon dots to synthesis modeling and AI-assisted spectral data extraction
… and optical probing, I fabricate ultrathin, atomically flat, and semi-transparent template-stripped Au films that simultaneously support scanning tunneling microscopy and single-particle photoluminescence, unlocking direct structure–property mapping at the single-dot level simultaneously. …
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Structural and magnetotransport study of SrTiO3-δ/Si structures grown by molecular beam epitaxy
… transmission electron microscopy (TEM), and were atomically flat as verified by atomic force microscopy (AFM), with rms roughness of less than 0.5nm measured by AFM. The thickness was measured by x-ray reflectivity. Transport measurements were performed on the STO/Si structures in a Van der Pauw …
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Surface Morphology Evolution of Epitaxial TiN(001) Layers Grown by Reactive Magnetron Sputtering
… in more complex polycrystalline films. Atomically-flat MgO substrates, prepared by air annealing at 950$\sp\circ$C for 12 hours, are verified by atomic force microscopy (AFM). Epitaxial TiN layers are grown on MgO(001) by reactive magnetron sputter deposition in pure N$\sb2$ at …
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Quantum transport in gapped graphene
… in detail the pulse laser deposition of atomically flat YIG thin films onto single crystal gadolinium gallium garnet with a magnetization of 144 emu cm$^{-3}$. This part also outlines device fabrication procedures including graphene exfoliation and dry transfer, electron beam lithography …
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Epitaxial Aluminum Oxide Thin Films on Niobium (110): A Study of Their Growth and Their Use in Superconducting Tunnel-Junctions
… a variety of materials analysis techniques. Atomically-flat niobium films grown on A-plane sapphire were used for the subsequent hetero-epitaxy of aluminum oxide. Depending on the thermal treatment used during growth, these niobium films had two distinct surface reconstructions. Using in situ …
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Adsorption & Adhesion of Asphaltenes at Complex Interfaces: An AFM Approach
… asphaltene molecules and well-defined, atomically flat surfaces. The model molecules examined displayed different deposition behaviour depending on their functionality. AFM morphological characterisation revealed that adsorption occurs at a range of lengthscales, from monomers to flocs, …
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Cross-Sectional Scanning Tunneling Microscopy of Silicon-Based Heterostructures Andp-N Junctions
… technique has been developed to help produce atomically-flat cleaved Si(111) surfaces, and cross-sectional STM has been performed on various samples prepared with this V-groove technique, including Si1-xGe x/Si heterostructures, ZnS/Si heterostructures, and Si p-n junctions. It is found on …
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Fabrication of silicon-based nano-structures and their scaling effects on mechanical and electrical properties
… The SiNLs possessed straight and nearly atomically flat sidewalls, almost perfectly rectangular cross sections and highly uniform linewidth at the nanometer scale. To characterize mechanical properties, an atomic force microscope (AFM) based nanoindentation system was employed to …
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Solid-Binding Peptides Enable Biomolecular Surface Assemblies and Mineralization
… self-assembled peptide (SAP) nanostructures on atomically flat surfaces, from an Alzheimer’s protein, Aβ, for assembly on a highly ordered pyrolytic graphite surface (HOPG) that mimic amyloid formation. Not only can this research advance technology, but it may also bring about a better …
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Electrochemical Thin Film Growth Assisted by Pb Monolayer
… was manipulated to enhance the evolution of atomically flat epitaxial overlayers. In the first part of this PhD work, electrochemical and electroless Pb UPD phenomena were investigated as a critical step in development of more sophisticated approaches to manipulate growth kinetics during …
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Atomically precise single Graphene Nanoribbon transistor
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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