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 32 for “"Scanning tunneling spectroscopy"”.
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Scanning tunneling spectroscopy of lead-substituted bismuth strontium copper oxide
… correlation with Pb location. Differential tunneling conductance is modeled using the van Hove scenario, wherein modulated regions are shown to have higher values of EVHS than flat regions. The consistency of parameters matching theoretical predictions to tunneling spectra suggest that EVHS …
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Exploring the strongly correlated realm of electrons using scanning tunneling spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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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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Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy
… However, this study presents the first scanning tunneling microscope imaging of two-dimensional flakes of TaS3. To study this material, we first modified a preparation tool on the microscope, and cleaned the microscope vacuum system to enable imaging at ultra-high vacuum. We achieved …
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Structural study of electrochemically induced adsorption and diffusion of metal surfaces
In the first part of this thesis, the scanning tunneling microscopy (STM) was used to characterize adsorbates physisorbed onto conductive surfaces. The STM is ideal for this because it is capable of obtaining real space images of local electronic and topographic features with atomic resolution. It …
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Scanning tunneling microscopy and spectroscopy of wet chemically synthesized porous graphene nanoribbons on hydrogen passivated silicon (100)
… The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A unique electronic feature is observed at the pore sites in the STM topographic images. STS measurements indicate the presence of the pores significantly increases the …
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Imaging the two gaps of the high temperature superconductor Pb-Bi₂Sr₂CuO₆₊x
… In this thesis, I report temperature dependent scanning tunneling spectroscopy of Pb-Bi2Sr2 CuO6+6 . I have developed a novel analytical method that reveals a new, narrow, homogeneous gap that vanishes near Tc, superimposed on the typically observed, inhomogeneous, broad gap, which is only …
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Scanning tunneling microscopy investigations of transition metal dichalcogenide 1t-tantalum disulfide and zigzag-shape graphene nanoribbons in ultra-high vacuum
… on hydrogen passivated silicon substrate through scanning tunneling microscopy (STM). Dry contact transfer allows unperturbed transfer and exfoliation of desired two-dimensional (2D) layered materials onto a desired substrate under ultra-high vacuum (UHV), to largely prevent potential solvent and …
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Scanning tunneling microscopy investigation of atomically precise graphene nanoribbons
… precursors into polyanthrylene. Detailed scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) measurements provided high-resolution imaging and reveal a 2.76 eV bandgap for chevron graphene nanoribbons. It was also discovered that tunneling to the substrate …
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Effects of a single magnetic impurity on superconductivity
… impurity has been probed experimentally with scanning tunneling spectroscopy by Yazdani et al.. Motivated by their experiment, we study the ef- fects of a single magnetic impurity on superconductivity by means of the mean-¯eld Bogoliubov-de Gennes theory. The Bogoliubov-de Gennes equations are …
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Tunneling spectroscopy of highly ordered organic thin films
… The molecular arrangement was characterized in Scanning Tunneling Microscopy and Low Energy Electron Diffraction investigations. Scanning Tunneling Spectroscopy data were recorded on monolayer and submonolayer PTCDA films. Measurements on closed PTCDA layers at different fixed tip sample …
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Probing the Properties of the Molecular Adlayers on Metal Substrates: Scanning Tunneling Microscopy Study of Amine Adsorption on Au(111) and Graphene Nanoislands on Co(0001)
… are studies of molecules on metal surfaces by scanning tunneling microscopy (STM). The first topic is on adsorption of a model amine compound, 1,4-benzenediamine (BDA), on the reconstructed Au(111) surface, chosen for its potential application as a molecular electronic device. The molecules …
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Scanning tunneling microscopy and spectroscopy of topological materials with broken symmetry
… not yet well established. In the first project, scanning tunneling spectroscopy was used to observe Landau quantization in thin films of (Bi1-xSbx)2Te3. By combining nanoscale imaging and spectroscopy, the sensitivity of the chemical potential to the chemical composition and thin film growth …
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Morphology, structure and electronic properties of CdTe surfaces studied by scanning tunneling microscopy
A scanning tunneling microscope has been used to study the surface properties of CdTe crystals. Coupled with scanning tunneling spectroscopy (STS) and atomic force microscopy, the surface morphology, structure and electronic properties of CdTe and CdZnTe surfaces have been studied. We have …
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Scanning tunneling microscopy and spectroscopy of nanometer scale metallic features on silicon surfaces
… thesis, I have used an ultrahigh vacuum (UHV) scanning tunneling microscope (STM) to fabricate nanometer scale metallic features on the Si(100)-2×1:H surface and form nanoscale metal contacts on the SWNTs. Scanning tunneling spectroscopy (STS) is used to study the electronic properties of the …
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Scanning tunneling microscopy characterization and metallic nanocontacts for atomically precise graphene nanoribbons
… solution-synthesized atomically precise GNRs by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A dry contact transfer (DCT) technique was implemented for depositing GNRs onto various semiconducting substrates. Detailed STM and STS measurements of doublewide GNRs on …
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Electronic band structure of III-V quantum dots using tight-binding and the k.p approximation
… greater than those observed experimentally via scanning tunneling spectroscopy (~0.1ev). Strain relaxing misfit dislocations are then considered as the source of this quantitative disagreement; both strain and charging effects of dislocations are investigated computationally, and found to have a …
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In-situ TEM study of carbon nanomaterials and thermoelectric nanomaterials
… edges are observed in GNRs. Atomic resolution scanning tunneling microscopy (STM) images were obtained on the folded layer and the bottom layer of the GNR, which enables clear identification of the chirality for both layers. We have also studied the electronic properties of the GNRs using low …
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STM Study of Interfaces and Defects in 2D Materials
… and gas sensors. This thesis focuses on scanning tunneling microscopy and spectroscopy (STM/STS) investigation of interfaces and defects 2D transition metal dichalcogenides (TMDCs). The first part of the thesis focuses on the synthesis of 2D TiSe2 with chemical vapor transport (CVT). By …
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The electronic structure of galena and hematite surfaces: applications to the interpretations of STM images, XPS spectra and heterogeneous surface reactions
Scanning tunneling microscopy (STM) images and scanning tunneling spectroscopy (STS) spectra of galena (PbS) and hematite (a-Fe203) were calculated using ab-initio methods in order to interpret experimental images and spectra that were taken in previous studies. These calculations have helped to …
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