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 19 of 19 for “"temperature scanning"”.
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Imaging Single-Electron Charging in Nanostructures by Low-Temperature Scanning Force Microscopy
… exhibit single-electron charging at low temperature, it is disorder that causes the formation of quantum dots in long semiconducting CNTs at low carrier density. Our instrument of choice is a lowtemperature atomic force microscope (AFM) that is sensitive to electrostatic sample forces. A …
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Variable Temperature Scanning Tunneling Microscopy Study of a High Temperature Superconductor BSCCO
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Variable Temperature Scanning Tunneling Microscopy Study of a High Temperature Superconductor Bi2Sr2CaCu2O8+d
We have used a custom-built scanning tunneling microscope (STM) to investigate the electronic states of a slightly underdoped high-TC superconductor Bi2Sr2CaCu2O8+d as a function of temperature. We have demonstrated for the first time that atomicallyresolved spectroscopic studies at elevated …
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Two-dimensional molecular self-assemblies on surfaces studied by low-temperature scanning tunneling microscopy
… supramolecular arrays were demonstrated by low-temperature scanning tunneling microscopy (LT-STM) in ultra-high vacuum (UHV) environments. Intensive effort had been devoted to construct mono- and bi-component organic molecular networks via various intermolecular interactions and …
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A variable temperature scanning tunneling microscopy study of organizing C60 molecules on nanostructured gold surface
… studied under various conditions using variable temperature UHV STM. At room temperature, the C\(_{60}\)/Au interface exhibits rich features observed in the STM images, for instance the lifting of the reconstruction and the appearance of dim molecules in the close-packed C\(_{60}\) overlayer. …
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Investigation on High-Mobility Graphene Hexagon Boron Nitride Heterostructure Nano-Devices Using Low Temperature Scanning Probe Microscopy
… graphene/boron nitride heterostructure using the scanning gate microscope. For the first experiment, we use the scanning gate microscopy to map out the trajectories of ballistic carriers in high-mobility graphene encapsulated by hexagonal boron nitride and in a weak perpendicular magnetic field. …
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In Situ High-Temperature Scanning Tunneling Microscopy Studies of Early Stage Growth Kinetics During Titanium Nitride Epitaxy
… large atomically-smooth terraces. I used in situ scanning tunneling microscopy to study time- and temperature-dependent 2D island coarsening/decay kinetics, obtain 2D equilibrium island shapes, and follow temporal fluctuations of island shapes on both TiN(001) and (111) surfaces. I have developed …
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Electronic characterization of solution-synthesized graphene nanoribbons using scanning tunneling microscopy
… side chains are also presented using scanning tunneling spectroscopy in a room temperature scanning tunneling microscope. The initial findings of the chevron/7A GNR with functionalized side chains are presented as the building blocks towards combining DNA origami and GNR precursors. …
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Scanning Tunneling Microscopy and Spectroscopy Measurements of Superconductor/Ferromagnet Hybrids
… hybrid structures using low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS) under ultra-high vacuum conditions. There are a number of novel effects that can occur due to the non-homogenous magnetic field from the ferromagnet, which directly influence …
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Supramolecular organisation, conformation and electronic properties of porphyrin molecules on metal substrates
… molecules adsorbed on metal surfaces via Low Temperature Scanning Tunneling Microscopy/Spectroscopy (STM/STS), supported by complementary X-ray absorption experiments. Intermolecular and molecule-surface interactions of tetrapyrdil porphyrin (TPyP) on Ag(111) and Cu(111) were investigated. …
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In-situ TEM study of carbon nanomaterials and thermoelectric nanomaterials
… adjacent graphene layers. An estimation of the temperature during in-situ Joule heating is also reported based on the melting and evaporation of Pt nanoparticles. In this thesis work, I have also investigated the morphological and electronic properties of GNRs grown by chemical vapor deposition. …
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Scanning Tunneling Microscopy Studies of Cluster Diffusion in a Highly Mismatched system:Copper on Silver(111)
I have used low-temperature scanning tunneling microscopy to investigate cluster diffusion phenomena in both the early stages of nucleation and growth and the late stages for a highly mismatched system, Cu on Ag(111). In particular, activation energies and prefactors for cluster diffusion are …
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Investigation of stagnation-flow diamond-forming flames using advanced laser diagnostics
Gas phase temperature and atomic-hydrogen concentration profiles were measured near the deposition substrate in atmospheric-pressure, stagnation-flow diamond-forming flames. In these flames, a rich acetylene/oxygen/hydrogen mixture accelerates through a nozzle and impinges on a water-cooled …
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Scanning Tunneling Microscopy Studies of Cluster Diffusion in a Highly Mismatched System: Copper on Silver(111)
I have used low-temperature scanning tunneling microscopy to investigate cluster diffusion phenomena in both the early stages of nucleation and growth and the late stages for a highly mismatched system, Cu on Ag(111). In particular, activation energies and prefactors for cluster diffusion are …
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Scanning tunneling microscopy and spectroscopy study of layered transition metal chalcogenide thin films tuned by thickness, structural phase, and heterostructure
… phase. The films were characterized by scanning tunneling microscopy and spectroscopy. Our finds are the following. The 1T-VSe2 samples, grown at low temperatures, display different CDW patterns on the first and second layers. In contrast, a novel phase, i.e. distorted 1T, is obtained in …
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Grain boundaries in coated conductors
… excitement which followed the discovery of high-temperature superconductors in 1986 was short-lived, as it became clear that their current carrying capacity (the critical current density Jc) was limited by grain boundaries (GBs). In order to reduce their detrimental effects coated conductors have …
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Novel reactions on halogen-terminated SI(100)
… Si(1OO). I have extensively utilized room-temperature and low-temperature scanning tunneling microscopes, as well as the variable-temperature instrument available in the Center of Microanalysis of Materials at the University of Illinois at Urbana Champaign, to get insights into atomic-level …
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Large-scale graphene transfer in ultra-high vacuum and design of a low temperature ultra-high vacuum scanning tunneling microscope
… onto clean surfaces in an ultra-high vacuum scanning tunneling microscope chamber via a modified direct contact transfer method. A polyethylene terephthalate (PET) film was chosen as the material for supporting graphene during the in-situ transfer. Both a scanning electron microscope and an …
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Investigation of the Surface-Electrolyte Interface of Semiconductors and Metals
… potassium on a Au(100) surface using variable temperature Scanning Tunneling Microscopy (STM). The two-layer system initially formed on the reconstructed Au(100) through addition of K is converted into a labyrinthine row structure upon the introduction of water. This structure features KOH …