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 9 of 9 for “"Highly Oriented Pyrolytic Graphite (HOPG)"”.
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Photoelectron Spectroscopy of highly oriented pyrolytic graphite using intense ultrashort laser pulses
… emission measurements made at the surface of Highly Oriented Pyrolytic Graphite (HOPG) using ultrashort laser pulses. It concentrates on the observation and understanding of a new phenomenon whereby infrared laser pulses of just 1.5eV photon energy can be used to generate photoelectrons with …
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Structural Characterization of Thin Films of Molecules on Solid Surfaces: Development of a Portable UHV Chamber to Bridge RHEED and SFG Spectroscopy Techniques
… structural transition of ILs on highly-oriented pyrolytic graphite (HOPG) was observed by RHEED, where an ordered structure for 2–10-nm films was found at low temperatures while no apparent 3D crystallization was found for films thinner than 2 nm nominally and thicker than ~10 nm. …
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A Vertical Coarse Approach Scanning Tunneling Microscope
… [4] with periodicity 3nm is observed on a highly-oriented pyrolytic graphite (HOPG) surface, and agrees well with previously published results. Using a flame-annealed Gold on mica surface, a low drift rate of 0.6nm s−1 is observed over a period of 13 minutes. Single-height atomic steps are …
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Terahertz Time-Domain Spectroscopy of Low-Dimensional Materials and Photonic Structures
… contactless fashion. In Chapter 3 we investigate highly oriented pyrolytic graphite (HOPG) using the THz emission spectroscopy. The direction, spectrum, polarization and dynamics of the emitted THz radiation from graphite upon ultrafast photoexcitation reveal the emission mechanism as well as the …
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Light induced reduction of individual graphene oxide films
… graphene oxide can be readily tuned, making it a highly versatile material in nanoscience and technology. This thesis reports original research work on laser-controlled reduction of individual graphene oxide films. Single flakes of graphene oxide film ranging from one to seven layers were reduced …
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Growth and characterization of epitaxial graphene films by Molecular Beam Epitaxy
… Although graphene isolated by exfoliation of Highly Oriented Pyrolytic Graphite (HOPG) crystals has been in place for sometime now, its micro sample size has triggered the research to produce wafer-scale graphene films. Chemical Vapor Deposition (CVD) of graphene on metallic substrates and …
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Scanning Probe Microscopy Study of Molecular Nanostructures on 2D Materials
… nitride (GaN) and pyramid nanostructures on highly oriented pyrolytic graphite (HOPG), we observe an intriguing curved region near the edge terminals. The measured band gap in these curved regions is consistent with the direct band gap in MoS2 monolayers. The curved features near the edge …
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Wettability of graphitic materials and their application in separation
… sheet of graphitic carbon and building block of graphite, is an ideal model material to study this interaction. However, due to defect formation and contaminant adsorption from ambient atmosphere during the fabrication and use, wettability investigation using conventional means has been …
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Functional materials for thermal regulation
… dissipation. I studied thermal conductivity of graphite thin films grown by chemical vapor deposition (CVD) on single crystal Ni (111) at temperatures between 825 and 900 C. The cross-plane thermal resistance of Al/graphite/Ni structures is a linear function of graphite film thickness in the …