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 39 for “"h-BN"”.
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H-BN integration in III-nitride devices for green hydrogen applications
… Gallium Nitride), GaN (Gallium Nitride), and h-BN (hexagonal Boron Nitride), which are promising materials for hydrogen production and storage applications thanks to their unique properties. InGaN, for example, offers a tunable band gap, high chemical stability, and good catalytic activity, …
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Additive manufacturing and mechanical properties of 2D h-BN reinforced nanocomposite
… fracture toughness is only about 4 MPa·m1/2. h-BN is a kind of 2D material which has a similar lattice structure to graphene, with B and N atoms adjacent to each other. It is well known for it dielectric properties and widely used as dielectric substrate and protective layer. People has found …
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Synthesis of graphene and h-BN by chemical vapor deposition and their transfer process
… materials including hexagonal boron nitride (h-BN) and transitional metal dichalcogenide (TMDC). In particular, the excellent material properties of graphene fascinated engineering fields to use it as a device component of applications such as RF-device or photodetector. Among various synthesis …
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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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Atomic-scale assessment of graphene-substrate interactions, grain boundaries, and materials for heterostructures
… insulating analog, hexagonal boron nitride (h-BN). These experimental studies are fundamental in nature, but they highlight parameters relevant to applications. Chemical vapor deposition (CVD) growth of graphene on Cu foil provides one path to wafer-scale graphene, but it creates rotationally …
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Optical study on hexagonal boron nitride
… and near band-edge optical transitions in h-BN, the temperature and layer number dependence of energy band gap of multiple-layer h-BN, and the temperature dependence of energy bandgap of boron nitride nanotubes.
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Large-scale growth, fluorination, clean transfer, and layering of graphene and related nanomaterials
… of graphene and hexagonal boron nitride (h-BN). Further, this document explores new avenues in the large-area, heterogeneous layering of graphene, h-BN, and related nanomaterials like nanoscale water and biomolecules. It is determined that monolayer, high-quality graphene growth by chemical …
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General Device Integration Strategies for Two-Dimensional Materials
… of graphene (Gr) or hexagonal boron nitride (h-BN), which are two members of the family of 2DLMs, in the laboratory using CVD. Often the only limit to the size of the sample is dictated by the dimensions of available equipment. Most studies have targeted the improvement of the quality of the …
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THERMAL AND THERMOELECTRIC PROPERTIES OF TWO-DIMENSIONAL HETEROSTRUCTURES
… interface thermal conductance across MoS2/h-BN and graphene/h-BN, thermoelectric transport in MoS2 on h-BN, and thermoelectric transport in MoS2/WSe2 p-n junctions. Our studies provide reference for the design of electronic/optoelectronic devices based on 2D heterostructures regarding heat …
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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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Inkjet Printing of 2d Materials on Flexible and Rigid Substrates
… (MXenes) and hexagonal boron nitride (h-BN) hold enormous potential for the next generation printable electronics. When these materials are formulated into inkjet printable inks, they can be incorporated with current inkjet printing technology. This strategy allows mask-less, large-area …
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AN EXPLORATION OF DEFECT-BASED SINGLE PHOTON SOURCES: ZINC OXIDE AND HEXAGONAL BORON NITRIDE
… 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 peaks separated by ~150 meV. …
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Characterization of nanostructured hexagonal boron nitride patterned via high-resolution ion beam lithography
… we demonstrate high-resolution patterning of h-BN via both helium and neon ion beams and pattern a h-BN grating with a 35 nm pitch and 20 nm feature size. We study varying degrees of nanostructuring and defects via Raman spectroscopy, photo-thermal microscopy, and scattering-type scanning …
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Two-dimensional material enhanced dielectric and conductive inks for printable electronics
… sensors. I utilise hexagonal boron nitride (h-BN) as a nanofiller to enhance the dielectric constant of polyurethane (PU) polymer inks and achieve a two-fold increase in εr by adding only 6.4 mg/mL h-BN, while keeping the resulting composite flexible and optically transparent. In order to …
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Design and fabrication of nitride-based solar cells and integration for tandem cell
… InGaN-based solar cells on 2-inch h-BN/sapphire wafer and their transfer to glass with a backside reflector. III-N solar cells with various sizes and designs are processed and characterized on a full 2-inch wafer giving performances comparable to similar devices on sapphire. The …
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Printing and coating of graphene and related materials for advanced devices
… at 865-928MHz. I have also formulated high-k h-BN inks via microfluidization suitable to achieve pin-hole free h-BN films down to 100nm thick and with dielectric constant of $\sim$7. I combined these h-BN dielectric films with graphene channels in inkjet printed flexible thin film transistors …
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Density Functional Theory Study of Two-Dimensional Boron Nitride Films
… (1L-) and bilayer hexagonal boron nitride (2L-hBN). I carried out technical developments and DFT calculations, and I have investigated the structural, formation energy, and electronic properties of both neutral and charged nitrogen and boron vacancy defects, as well as carbon substitutions for …
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Spin Shot Noise measurement
… spin accumulation on charge shot noise in Pt/h-BN/Au tunnel junctions, where a flicker noise is caused by the thermally excited dynamic defects in the h-BN layer itself. The defect density is on the order of a few per square micron. We also detected a spin Seebeck voltage noise in structures …
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Organometallic Functionalization of 2D Nanomaterials for Energy and Medical Applications
… on graphene and hexagonal boron nitride (h-BN). The central theme of this work is the use of coordination-based chemistry to engineer nanoscale interfaces while preserving lattice planarity and charge transport properties that are critical for electronic and diagnostic applications. Unlike …
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Synthese, Charakterisierung und Materialeigenschaften borreicher Boride und Boridcarbide des Magnesiums und Aluminiums
… die Synthesen in geschlossenen Gefäßen (aus h-BN) durchgeführt. Um während der Synthesen sowohl ein Bersten der h-BN-Tiegel als auch Mg-Verluste durch Diffusion zu vermeiden, wurden die h-BN-Tiegel wiederum in verschließbare Ta-Ampullen eingeführt. Die doppelte Wandung aus h-BN und Ta wurde …
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