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 13 of 13 for “"STM/STS"”.
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Atomic-level investigation of surface processes governing SiGe wetting layer formation using STM/STS
… scanning tunneling microscopy (STM) is used to study ADCSs, as they only appear in empty-state images. ADCSs are dilute structures comprising type-C addimers that reside in neighboring troughs and extend along all equivalent <130> directions of the surface, giving rise to a …
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Scanning tunneling spectroscopy of lead-substituted bismuth strontium copper oxide
… solubility limit of x = 0.38 and studied using STM/STS in the overdoped regime where Tc < 2K. Despite the high lead content, residual supermodulations are observed in the BiO plane. In agreement with previous studies on (Pb,Bi)-2201, there is no separation of the sample into Pb-rich and Pb-poor …
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Electronic structure of perovskite oxide surfaces at elevated temperatures and its correlation with oxygen reduction reactivity
… scanning tunneling microscopy and spectroscopy (STM/STS) demonstrated that the apparent energy gap increases with Fe fraction. This trend is opposite to the dependence of the bulk STF band gap on Fe fraction and is attributed to the formation of SrO that deteriorates oxygen reduction kinetics. …
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The Electronic Structure and Reactivity of Sulfide Surfaces: Combining Atomic-Scale Observations with Theoretical Calculations
… scanning tunneling microscopy and spectroscopy (STM/STS), the electronic structure at atomic sites on these surfaces was directly probed, and chemical insight into the results was provided by ab-initio calculations. Pyrite is the most abundant sulfide at the earth's near surface. Its oxidation …
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Scanning Tunneling Microscopy and Spectroscopy Measurements of Superconductor/Ferromagnet Hybrids
… 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 the global and local superconducting properties. These effects …
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Supramolecular organisation, conformation and electronic properties of porphyrin molecules on metal substrates
… 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. TPyP self-assembles on Ag(111) over a wide sample …
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STM Study of Interfaces and Defects in 2D Materials
… 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 properly choosing the growth condition, Sub-10 nm …
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Intercalation of sulfur in epitaxial graphene on ruthenium(0001) studied by means of scanning tunneling microscopy and spectroscopy
… scanning tunneling microscopy and spectroscopy (STM/STS) in ultra-high vacuum (UHV) conditions. Part of the characterization was done at low temperature, and complementary UHV characterization techniques were also used. Epitaxial graphene on Ru(0001) (graphene/Ru(0001)) is grown by catalytic …
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Structure Characterization and Electronic Properties Investigation of Two-Dimensional Materials
… scanning tunneling microscopy and spectroscopy (STM/STS) and first-principles calculations. Five types of distinct defects were observed from STM topography images and the local density of states of the defects were obtained. By combining the STM results with first-principles calculations, the …
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Microscopic Study of Structure, Chemical Composition and Local Conductivity of La2/3Sr1/3MnO3 Films
… Sr segregation, scanning tunneling spectroscopy (STS) is applied to study the local electronic properties. According to the STS results, the nonmetallic character and spontaneous polarization at the surface of both thin and thick LSMO films is revealed. The difference in surface behavior from the …
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Mechanisms governing the growth, reactivity and stability of iron sulfides
… iron sulfide samples. This thesis therefore consists of three case studies on the stable Fe-S phases pyrrhotite (Fe₁-xS) and pyrite (FeS₂) to identify the elementary corrosion mechanisms and their kinetic parameters. Pyrrhotite is of interest because the off-stoichiometry of this phase leads to …
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Investigation of a metal-organic interface - realization and understanding of a molecular switch
… of the Scanning Tunnelling Microscope's (STM's) ability to act as a local probe, a single molecular switch was realized and studied. Moreover, in close collaboration with theory groups, the underlying mechanism driving the switching process was identified and described. Besides the …