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 58 for “"Graphene sheets"”.
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Decoration of graphene sheets with metal and metal oxide nanostructures by low-pressure plasma deposition
This thesis was dedicated to decorate graphene sheets with metal and metal oxide nanostructures by RF sputtering technique. Two main objectives were focused in this thesis. 1) To decorate graphene sheets uniformly with metal and metal oxide nanostructure without agglomeration. 2) To explore …
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Elastic constants from molecular mechanics simulations of frequencies of free-free single-walled carbon nanotubes and clamped single-layer graphene sheets
… carbon nanotubes (SWCNTs) and single-layer graphene sheets (SLGSs) are determined by studying their free vibration characteristics using molecular mechanics (MM) simulations with the MM3 potential and finding their equivalent continuum structures (ECSs). The computational framework has been …
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Synthesis and Characterization of Graphene-Polymer Nanocomposites via Reversible Addition-Fragmentation Chain-Transfer Polymerization
Graphene has emerged as a subject of tremendous scientific interest due to its exceptional electrical, mechanical and thermal properties. When incorporated into a polymer matrix, graphene sheets can significantly improve the properties of the host polymer. However, the dispersion of pure graphene …
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Mechanics, Design, and Fabrication of Metal-Graphene Composites
In the last decade, metal-graphene composites have seen significant progress and have received increasing attention because of graphene's ability to improve the mechanical properties. The main mechanism of improvement in metal graphene composite is based on the impeding of dislocations by graphene …
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Synthesis and analysis of carbon nanowalls and their raman spectroscopy
… spectrum have been related to the length of Graphene walls, to study the CNW's length on different substrates. The growth was carried on three substrates; Silicon wafer, Silicon wafer coated with Nickel Formate Dihydrate (NFD) as a catalyst.and Pure Nickel foil. It has been found that the …
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Electron beam characterization of carbon nanostructures
… Electron microscope images of "edge-on" graphene sheets show linear image features due to the projected potential of the sheets. Here, intensity profiles along these linear features can measure the curvature of the sheet, as well as the shape of the sheet (i.e. hexagonal, triangular). …
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New PCM based FPGA architecture and graphene memory cell design
… be implemented to a memory cell utilizing the graphene sheet-to-sheet tunneling effect to store data. The SYMFET sheet-to-sheet tunneling can generate high current density when the Dirac points of graphene sheets are aligned; low current density is generated when Dirac points are not aligned. …
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Multimodal Polyethylene-Graphene Nanocomposite via Melt Extrusion
The production of an innovative, high-performance graphene-based multimodal-high-density polyethylene (HDPE)polymer nanocomposite using cost-effective techniques was pursued in this study. This study reports on the reinforcement of high molecular weight multimodal-high-density polyethylene HDPE by …
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DEVELOPMENT OF NANO-STRUCTURED METAL OXIDES/GRAPHENE FOR ENERGY APPLICATIONS
… development of novel method of incorporating graphene sheets into V2O5 nanoribbons via the so-gel process. The graphene modified nanostructured V2O5 Hybrid has been developed with extraordinary electrochemical performance, 438 mAh/g, almost achieving the theoretical specific capacity, 443 …
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DEVELOPMENT OF NANO-STRUCTURED METAL OXIDES/GRAPHENE FOR ENERGY APPLICATIONS
… development of novel method of incorporating graphene sheets into V2O5 nanoribbons via the so-gel process. The graphene modified nanostructured V2O5 Hybrid has been developed with extraordinary electrochemical performance, 438 mAh/g, almost achieving the theoretical specific capacity, 443 …
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Application of CVD graphene in organic photovoltaics as transparent conducting electrodes
Graphene, a hexagonal arrangement of carbon atoms forming a one-atom thick planar sheet, has gained much attention due to its remarkable physical properties. Apart from the micromechanical cleavage of highly ordered pyrolytic graphite (HOPG), several alternate methods have been explored to achieve …
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Carbon nanotube field effect transistors for power application
… cylinders formed from rolled-up graphene sheets which have found widespread interests due to their many excellent electrical properties. In particular, most of them are direct bandgap semiconductors from which carbon nanotube field effect transistors (CNTFETs) can be made. The …
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Twist angle physics in graphene based van der Waals heterostructures
… present my experimental work on twisted bilayer graphene, a van der Waals heterostructure consisting of two graphene sheets stack on top of each other. In particular, the twist angle is a new degree of freedom in this system, and has an important effect in the determination of its transport …
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Theoretical Study of Carbon-Based Materials and Their Applications in Nanoelectronics
… realization of thermodynamically stable planar graphene. Two-dimensional monolayer graphene sheets have unique electrical and physical properties which can be exploited in new device structures. However, due to its semi-metallic nature, much focus has been given to converting graphene based …
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Graphene Based Metamaterials For Terahertz Cloaking And Subwavelength Imaging
Graphene is a two-dimensional carbon crystal that became one of the most controversial topics of research in the last few years. The intense interest in graphene stems from recent demonstrations of their potentially revolutionary electromagnetic applications – including negative refraction, …
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Understanding and engineering molecular interactions and electronic transport at 2D materials interfaces
… considered include: (i) wetting behavior of graphene (micrometer scale), (ii) solution processing of graphene and graphene oxide (nanometer scale), and (iii) electronic modification in graphene and molybdenum disulfide (atomic scale). The first part of my thesis investigates the wetting …
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Scaling Carbon-Cement Supercapacitors for Energy Storage Use-Cases
… of various collector materials revealed that graphene sheets and stainless steel–reinforced graphillic papers offered optimal trade-offs between conductivity, corrosion resistance, and mechanical performance. The thesis concludes with two field-implementation design proposals—a vertical column …
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Synthesis of functionalized few layer graphene via electrochemical expansion
Single layer graphene is a nearly transparent two-dimensional honeycomb sp2 hybridized carbon lattice, and has received immense attention for its potential application in next-generation electronic devices, composite materials, and energy storage devices. This attention is a result of its desirable …
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Carbon nanotubes and graphene in aqueous surfactant solutions : molecular simulations and theoretical modeling
… and applications of carbon nanotubes (CNTs) and graphene sheets dispersed in aqueous surfactant solutions. In particular, the role of the bile salt anionic surfactant, sodium cholate (SC), in dispersing single-walled carbon nanotubes (SWCNTs) and graphene sheets in aqueous solutions was …
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Low-temperature protonation studies of an electron-poor osmium methyl complex, and molecular precursors for the construction of graphene nanostructues with atomically precise edge structures
… for the surface-assisted synthesis of various graphene structures, including graphene sheets, graphene sheets with a regular pattern of holes, and graphene nanoribbons (GNRs). Criteria were specified for determining the likelihood that oligophenylene precursors would form the intended …
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