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 83 for “"hexagonal boron nitride"”.
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Optical study on hexagonal boron nitride
… the temperature dependence of energy bandgap of boron nitride nanotubes.
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Mirror-Coupled Nanoantennas with Hexagonal-Boron Nitride Spacers
… consisting of the layered dielectric hexagonal-Boron Nitride encapsulated between gold nanoparticles and a gold substrate, are probed using high-angle optical scattering measurements. During illumination of individual nanoparticles, light is trapped at the nanoscale inside the hBN, …
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Advancements in Hexagonal Boron Nitride for Thermal Neutron Detection Applications
Hexagonal boron nitride (h-BN) possesses many unique physical properties which combined have made h-BN an incredibly attractive material for a vast array of technologically significant applications. Some of these properties include extremely wide bandgap, strong optical absorption of above bandgap …
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High temperature quantum transport in graphene/hexagonal-boron nitride heterostructures
… electron flow in graphene encapsulated with hexagonal boron nitride devices. At elevated temperatures, electron-electron collisions become significant, and the electron viscosity starts to influence the steady state current distribution in a variety of surprising ways. In the first work, we …
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Growth and characterization of high-quality bulk hexagonal boron nitride crystals
While hexagonal boron nitride (hBN) in polycrystalline form has met demand for its mechanical, chemical, and thermal applications, its new electronic, optoelectronic, and nanophotonic applications required single crystals with low residual impurity concentrations. Grain boundaries and impurities …
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Epitaxial growth and characterization of hexagonal boron nitride for deep UV applications
Hexagonal boron nitride has attracted a lot of interest in the deep UV community of late. Due to its wide bandgap (~ 6 eV), hBN has a significant potential for deep ultraviolet (DUV) photonic device applications. Additionally, the high neutron capture cross-section of the isotope boron-10 makes hBN …
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Investigations of hexagonal boron nitride: bulk crystals and atomically-thin two dimensional layers
Hexagonal boron nitride has been used as an inert, refractory material with excellent resistance to thermal decomposition and oxidation for more than fifty years. In the past few years, hBN has been targeted for potential electrical and optical devices such as neutron detectors, ultraviolet light …
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Optimisation, Stabilisation, and Localisation of Quantum Emitters in Layer-Engineered Hexagonal Boron Nitride
For a long time, hexagonal boron nitride (hBN) has been considered the silent sister material of graphene, but recently an appreciation for it is starting to grow within the scientific community for the properties it possesses and not just its functionality as graphene’s supporting partner. The …
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Visible Emitters in Hexagonal Boron Nitride as an Optically Addressable Spin Qubit Platform
… visible emitters embedded in epitaxially grown hexagonal boron nitride (hBN) films, displaying bright single-photon emission and quantum coherent spins under ambient conditions. Two optically addressable electronic spin manifolds in these defects are described, investigated using optically …
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Superlattices and quantum spin Hall states in graphene and hexagonal boron nitride heterostructures
… (2d) layered materials, such as graphene and hexagonal boron nitride (hBN), can be isolated separately and then stacked together to form heterostructures with crystalline interfaces between the layers. In this thesis, I present a series of experiments which explore the quantum transport of …
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Characterization of nanostructured hexagonal boron nitride patterned via high-resolution ion beam lithography
… Furthermore, tuning the properties of hexagonal boron nitride, graphene, and other 2D materials in-plane and stacking them into heterostructures has the potential to create hybrid optical, electronic, thermal, and mechanical properties with a wealth of new functions. To fully tailor …
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Synthesis of bilayer graphene and hexagonal boron nitride by chemical vapor deposition method
… part involves exploring methods of synthesizing hexagonal boron nitride (hBN). The successful isolation of monolayer graphene in 2004 has attracted many researchers to search for potential applications of graphene and other two-dimensional materials in electronic and optical devices. However, the …
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AN EXPLORATION OF DEFECT-BASED SINGLE PHOTON SOURCES: ZINC OXIDE AND HEXAGONAL BORON NITRIDE
… candidates in SiC, GaN, WSe2, WS2, ZnO, and hexagonal boron nitride (h-BN). In this thesis we focus our attention on single photon emission from defect in ZnO and h-BN. In the case of ZnO, the single-photon emission is in the range of 560 – 720 nm and typically exhibits two broad spectral …
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Photocurrent Spectroscopy Study of Graphene / Hexagonal Boron Nitride Moiré Superlattice In the Far-Infrared Regime
… Then I will apply it to the monolayer graphene / hexagonal boron nitride (hBN) moiré superlattices, where I accurately measure the gap ∆ opened at charge-neutral point (CNP) by the moiré superlattice. The relationship between the gap size and the moiré wavelength will also be discussed. Finally, I …
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Quantum capacitance measurements of single-layer molybdenum disulfide
… heterostructures composed of a thin layer of hexagonal boron nitride atop a monolayer of molybdenum disulfide were fabricated with the goal of measuring quantum capacitance and probing the transition metal dichalcogenide's density of states. In the final devices, no modulation of the …
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Engineering Rare-Earth Based Color Centers in Wide Bandgap Semiconductors for Quantum and Nanoscale Applications
… wide bandgap semiconductors, such as hexagonal boron nitride and tungsten disulfide, offer for device integration. First, confocal Raman and fluorescence spectroscopy techniques are combined to isolate single native color centers in cubic boron nitride nanocrystals that feature …
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Atomistic modeling and simulations of 2D materials : chemical vapor deposition, nanoporous defects, force-field development, wetting, and friction
… (TMDs) (e.g., molybdenum disulfide (MoS₂)), and hexagonal boron nitride (hBN), have recently received considerable attention, due to their layer-number-dependent optoelectronic, mechanical, and barrier properties. However, physical understanding of the controlled synthesis and interfacial …
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Kinetic Inductance Characterization of Thin 2H-NbSe₂ Superconductor Using Circuit Quantum Electrodynamics
… contact thin NbSe₂, entirely encapsulated with hexagonal Boron Nitride (hBN), with a coplanar Al resonator. Then we fabricated hybrid Al-NbSe₂ resonators and measured the kinetic inductance of thin NbSe₂ at low-temperature and low-photon number limits. In this thesis, we discuss the observed …
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Density Functional Theory Study of Two-Dimensional Boron Nitride Films
… 2D materials that has emerged in recent years is hexagonal boron nitride, in its monolayer or multilayer form. In my thesis work, I used density functional theory (DFT) calculations to investigate the properties of boron nitride films. In particular, I first studied the properties (i.e. formation …
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