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 43 for “"single layer graphene"”.
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Galvanic Displacement Across Single-Layer Graphene
… displacement reactions as buffered by a monolayer of graphene, specifically by investigating palladium deposition on graphene on a copper foil substrate via galvanic displacement between the copper and palladium (II) ions in solution. To understand palladium nanoparticle deposition and …
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Gas Separation Using Nanoporous Single-Layer Graphene Membranes
Nanoporous single-layer graphene is regarded as a highly promising membrane material for gas separation due to its atomic thickness. When single-layer graphene contains a high density of gas sieving nanoscale pores, it can exhibit both a high gas permeance and a high selectivity, which is …
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Molecular insight into the slip of water and ions along single layer graphene in aqueous media
… modulation of water molecule slippage along graphene surfaces is crucial for many promising applications of two-dimensional materials. Here, we examine normal and shear forces on supported single-layer graphene supported by Atomic Force Microscopy and find that the composition of the …
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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
Elastic constants of single-walled 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 …
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Single layer graphene as a stable and transparent electrode for the measurement of non-aqueous electrogenerated chemiluminescence and charge transfer inverse photoemission
In this work we explore the use of single layer graphene (SLG) obtained by chemical vapor deposition as a transparent electrode material for use in coupled electrochemical and spectroscopic experiments in non-aqueous media through electrogenerated chemiluminescence (ECL). SLG was used with …
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Charging and defects in single-walled carbon nanotubes
Single-Walled Carbon Nanotubes (SWCNTs) have been one of the most intensively studied materials. Because of their single-atomic-layer structure, SWCNTs are extremely sensitive to environmental interactions, in which charge transfer and defect formation are the most notable effects. Among a number …
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Single- and few-layer graphene by ambient pressure chemical vapor deposition on nickel
… deposition (APCVD) process is used to fabricate graphene based films consisting of one to several graphene layers across their area. Polycrystalline Ni thin films are used and the graphene can be transferred from the Ni surface to dielectric substrates in order to integrate them to graphene …
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Quantum many body physics in single and bilayer graphene
… avenue for investigation of many body physics. Graphene constitutes a new and unusual 2DES, which may give rise to unexpected collective phenomena. However, the vanishing density of states in charge neutral single layer graphene suppresses many body effects, and one has to alter the system to …
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TWO-DIMENSIONAL CRYSTALS ON SUBSTRATES: MORPHOLOGY AND CHEMICAL REACTIVITY
Two-dimensional crystals such as graphene and transition metal dichalcogenides have emerged as a new class of materials. They serve as rich playgrounds for two-dimensional physics but also have great potential for a wide range of applications due to their exceptional tunability via external …
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Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater
… phase transitions are driven by an integrated single-layer graphene heater, providing high electro-thermal efficiency, low absorption loss, and rapid switching speed. Computational simulations demonstrate reversible phase transitions of Sb₂Se₃ facilitating 2 working states with crosstalk (CT) …
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Development of experimental methods to measure osmosis-driven water flux and molecular transport across nanoporous graphene membranes
Graphene, an atomically thin planar lattice of sp2 bonded carbon atoms with high strength and impermeability, has drawn attention as a promising next generation high flux separation membrane. Molecular dynamics simulations predicted graphene's potential for exhibiting both high flux and selectivity …
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Graphene at interfaces
… interactions between extended π-systems of graphene in various graphites have been studied for several decades. However, to date, no effective scalable exfoliation mechanism has been reported to exclusively synthesize dispersible single layer graphene in liquid environments. The first …
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Transport of molecules through and on carbon nanostructures
Single-layer graphene membranes and other 2D membranes can realize very high gas permeation fluxes due to their atomic or unit cell thickness. Established modeling approaches for membrane transport consider transport through a finite and continuum thickness, and therefore they do not apply to the …
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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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Coupling Raman spectroscopy and scanning electrochemical microscopy for spectroelectrochemical analysis of electrode interfaces
… including redox active colloids, modified graphene layers, and single layer graphene with sublayer gold nanoparticles. In each case the instrument setup afforded information only obtainable by coupling the two techniques, demonstrating the usefulness of a spatially resolved multimodal …
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Single-crystal growth of organic semiconductors and organic electronic applications
This thesis describes single crystal growth of organic semiconductors and their applications in organic electronics. In Chapter 2, a self-assembled monolayer of C60 derivatives with five carboxylic acids was employed to make C60 thin-film transistors. The highly-crystalline C60 monolayer enabled …
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Energy-Efficient Switching By Band Modulation And Passive Equalization
… a novel switch is proposed and implemented using single-layer graphene as the channel material to provide higher carrier mobility, bandgap modulation and efficient band-to-band tunneling. System implementation and process integration in the frontend space lithography and backend thin films are …
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The modification of graphene band structure by periodic potential perturbation
Monolayer graphene has been under the spotlight of research since its discovery in 2004, due to its unusual properties such as massless Dirac fermions, exceptional tensile strength, ultrahigh thermal conductivity, superior charge carrier mobility, remarkable optical properties etc. Graphene-based …
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Surface functionalization of graphene devices
Graphene, a zero-gap semiconductor with massless charge carriers, is emerging as an amazing material for future electronics, due to its outstanding electrical and mechanical performances. However, the lack of a bandgap results in a high off-state current leakage and a nonsaturating drive current, …
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The plasmonics of a nanosphere on a mirror substrate
… carbon molecules inside the gap created by using single layer graphene as a spacing layer. This thesis demonstrates that optical spectroscopy is an effective method for characterising single layers of graphene. This is confirmed by comparing the experimental results to a theoretical method, which …
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