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 62 for “"vdw"”.
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Study of vdW Magnetic Materials for Spintronic Applications
… for fabricating devices with air-sensitive vdW magnetic materials and characterising them has been developed, including the electrochemical exfoliation of bulk vdW crystals, the design and building of a 2D material transfer setup and nanofabrication of devices using lithography, and …
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Chalcogenide Glass on Layered van der Waals Crystals for Integrated Photonic Devices
Layered van der Waals (vdW) materials have demonstrated huge potential for photonic devices with their varied and tunable optical properties. They can be integrated into planar photonic devices on virtually any substrate due to their van der Waals bonding, thereby introducing desirable material …
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Quasi-One-Dimensional van der Waals Lattices with Diverse Magnetism: New Platforms Towards Ultrathin Magnetic Nanowires
One-dimensional (1D) or quasi-1D van der Waals (vdW) magnets, which feature covalently bonded spin chains or ladders separated by weak vdW interactions, could potentially offer twofold benefits for the current field of 1D magnets. On the one hand, the bulk crystals of these phases are more ideal 1D …
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Application of the Coupled Dipole Method for Predicting Swelling and Exfoliation Behavior of Layered Inorganic Materials
… inorganic materials is the van der Waals (vdW) interaction. The vdW force, considered to be a weak interaction in many cases, has a strong influence on the structure and properties of colloidal and nano-materials, especially the swelling and exfoliation of nanometer-thick platelets in …
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Interface-Governed Optical Properties of Van der Waals Heterostructures
Van der Waals (vdW) layered materials are an emerging class of materials that can be readily separated into atomically thin layers, exhibiting distinct physical properties compared to their bulk counterparts. Moreover, each of the layers can be vertically assembled into vdW heterostructures, …
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Understanding and Controlling the Magnetic and Optical Properties in van der Waals Semiconductors
… (2D) materials, 2D van der Waals (vdW) magnetic semiconductors are distinguished by their novel properties, which stem from the weak yet tunable interlayer magnetic interactions, adding an entirely new magnetic degree of freedom to vdW interfacial engineering. In this dissertation, …
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Influence of van der Waals interfaces on electrical and optical properties of two-dimensional materials
… investigates the influence of van der Waals (vdW) interfaces on electrical and optical properties of 2D materials. I began by studying the nucleation and growth of indium and gold metal films on 2D materials such as molybdenum disulfide (MoS2) and graphene. Indium and gold metal films were …
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Chirality-dependent, van der Waals-London dispersion interactions of carbon nanotube systems
… and multi-body effects) and determine the vdW-Ld interaction magnitude and sign a priori from the optical properties rather than by parameterization. Single wall carbon nanotubes (SWCNTs) represent an ideal class of materials to study vdW-Ld interactions because very small changes in their …
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Nanoscale Engineering for Mixed-Dimensional Heterostructure Growth and Integration
Recent attempts to create van der Waals (vdW)-bonded heterostructures of distinct twodimensional (2D) crystals has opened new avenues for research, from the fundamental studies of emergent phenomena to the development of practical applications with unique functionalities, which are attributed to a …
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Understanding and characterizing thermal transport in 2D van der Waals nanoelectronics
… challenges arise due to numerous van der Waals (vdW) interfaces limiting dissipation of heat generated in the device, induces significant temperature rise, and creates large thermal mismatch, resulting in the degradation of device performance and even failure of the device. The highly localized …
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Density-functional theory and beyond for organic electronic materials
… Funktionale beinhalten keine Van-der-Waals-(vdW)-Wechselwirkungen und weisen einen beträchtlichen Selbstwechselwirkungsfehler auf. Die vorliegende Arbeit zeigt anhand des Tetrathiafulvalen-(TTF)-Tetracyanoquinodimethan-(TCNQ)-Komplexes, dass beide Aspekte bei schwach wechselwirkenden …
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Advancing the computational exploration for thermoelectric materials
… which are bound by loose van der Waals (vdW) bonds. A large set of these vdW layered materials had previously been identified through the use of a slab-cutting algorithm. In addition to the vdW layered materials, there exists another set of layered compounds which is of interest to the …
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Characterizing water-metal interfaces and machine learning potential energy surfaces
… (DFT) which explicitly include van der Waals (vdW) interactions within a first principles approach. All calculations reported use large simulation cells, allowing for an accurate treatment of the water-electrode interfaces. We have included vdW interactions through the use of the optB86b-vdW …
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Investigation of van der Waals ferroelectric CuInP2S6 by scanning probe microscopy
… for device miniaturization, van der Waals (vdW) ferroelectrics that feature atomically thin ferroelectricity and complementary metal-oxide-semiconductor (CMOS)-compatible defect-free interfaces are highly promising for the construction of post-Moore’s law electronics. Among the ferroelectric …
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Electrical contacts on two-dimensional transition metal dichalcogenide semiconductors
… Studies have shown that van der Waals (vdW) contacts formed by dry transfer of graphene and metals can avoid damage to atomically thin TMDs caused by metal deposition. My doctoral thesis focuses on study of metal-2D TMD interfaces through high resolution cross-section scanning …
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Van der Waals Heterostructures and 2D Materials with Native Oxide for Emerging Electronic Applications
… of devices based on 2D materials van der Waals (vdW) and semiconductor/native oxide heterostructures. The susceptibility of these materials to contamination is highlighted, especially in vdW heterostructures. Elemental analysis of chemical species present at the interfaces of hBN-encapsulated …
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Spectroscopic study of emergent electronic phases in transition metal based compounds
… magnetic order in atomically-thin van der Waals (vdW) materials has created new opportunities for the study of collective spin phenomena in free-standing two-dimensional (2D) systems and nanoscale devices. Among possible multiferroic vdW materials, several families have been identified, and of …
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Optical and core-level X-ray spectroscopy of correlated two-dimensional materials
… strongly correlated electrons in van der Waals (vdW) materials offers a rich landscape of ordered phases and associated excitations for potential applications in nanoelectronics. The coupling between distinct degrees of freedom in correlated materials provide routes to realize novel functional …
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Understanding heat transport at interfaces for thermal management of electronics
… and thermal transport of the van der Waals (vdW) bonded 2D interfaces, and developed highly efficient thermal management solutions based on two-phase cooling. First, we developed for the first time a pure experimental approach to accurately measure the thermal expansion coefficients(TECs) of …
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Skyrmions and non-collinear magnetic domains in Fe₃GeTe₂
… Fe3GeTe2, an air sensitive van der Waals (vdW) material known to host nanoscale magnetic whirlpools called skyrmions. The vdW nature of Fe3GeTe2 means we can exfoliate 2D layers that can be easily incorporated into a wide range of devices. Behaving as particles that can be manipulated, …
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