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 17 of 17 for “"Scanning Tunneling Spectroscopy (STS)"”.
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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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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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Effect of the spin-orbit coupling on the quasiparticle interference spectra on metal surfaces
… μέθοδοι, όπως η φασματοσκοπία σάρωσης σήραγγας (Scanning Tunneling Spectroscopy-STS), μια εξέλιξη της μικροσκοπίας σάρωσης σήραγγας (Scanning Tunneling Microscopy-STM), επιτρέπουν την ανίχνευση τέτοιων ταλαντώσεων γύρω από ατέλειες σε κρυσταλλικές επιφάνειες. Ακόμη, η προσθήκη μαγνητικών ατελειών …
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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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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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Microscopic Study of Structure, Chemical Composition and Local Conductivity of La2/3Sr1/3MnO3 Films
… in-situ angle-resolved x-ray photoelectron spectroscopy (ARXPS), ex-situ scanning transmission electron microscopy (STEM), and electron energy loss spectroscopy (EELS). Substantial deviations in Sr doping concentrations from its bulk value are observed at both the interface and surface. …
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STM Study of 2D Metal Chalcogenides and Heterostructures
… science. Many research methods, including scanning tunneling microscopy (STM), transmission electron microscopy (TEM), optical and transport measurements, have been used to investigate these unique properties. Among them, STM stands out as a powerful characterization tool with atomic …
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Electronic and vibrational properties of fullerenes and metallofullerenes studied by STM and STS
… thesis presents the results of a low temperature scanning tunneling microscopy (STM) study on fullerenes and endohedrally doped fullerenes. The measurements have been performed for three different molecules: C60, Ce@C82 and Ce2@C80, adsorbed on metal surfaces. The investigated molecules belong to …
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Single Molecule Junction Conductance and Binding Geometry
… single organic molecule-metal junctions. Using a Scanning Tunneling Microscope (STM) we image, probe energy-level alignment and perform STM-based break junction (BJ) measurements on molecules bound to a gold surface. Using Scanning Tunneling Microscope-based break-junction (STM-BJ) techniques, we …
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Electron transport studies - an electrochemical scanning tunneling microscopy approach
… work presented here describes the application of scanning tunneling microscopy (STM) and electrochemical techniques to investigate the electron transfer (ET) in various systems. The experimental results are accomplished by the theoretical description of the studied processes, well known as well as …
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STUDIES OF 2D LAYERED MnO2 AND MoS2 FOR ANTIBACTERIAL AND ELECTROCHEMICAL APPLICATIONS
… compared to Gram-negative bacteria. Moreover, scanning electron microscopy images suggested that the nanosheets compromised the cell wall upon interaction, which led to significant bacterial morphological changes. We propose that the peptidoglycan mesh in the bacterial wall is likely the …