Browsing by Subject "graphene"
Now showing items 1-20 of 36
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Anomalous length dependence of the conductance of graphene nanoribbons with zigzag edges
(2013)Charge transport through two sets of symmetric graphene nanoribbons with zigzag shaped edges in a two-terminal device has been investigated, using density functional theory combined with the non-equilibrium Green's function ... -
Dynamic RKKY interaction in graphene
(2012)The growing interest in carbon-based spintronics has stimulated a number of recent theoretical studies on the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in graphene, based on which the energetically favorable alignment ... -
Dynamical tuning of energy transfer efficiency on a graphene monolayer
(2015)In this contribution we present a theoretical investigation of the energy transfer efficiency between quantum systems placed in proximity of a monolayer of conducting graphene. We calculate the spontaneous emission rate ... -
Edge-carboxylated graphene nanoflakes from nitric acid oxidised arc-discharge material
(2010)Graphene nanoflakes (GNFs) with average diameters of 30 nm have been prepared by a single-step oxidation procedure using single-wall carbon nanotube arc-discharge material and nitric acid. The GNFs are predominately ... -
The Effect of Downstream Plasma Treatments on Graphene Surfaces
(2012)This paper reports on the effects of growth, transfer and annealing procedures on graphene grown by chemical vapour deposition. A combination of Raman spectroscopy, electrical measurements, atomic force microscopy, and ... -
Electronic structure of graphene beyond the linear dispersion regime
(2011)Among the many interesting features displayed by graphene, one of the most attractive is the simplicity with which its electronic structure can be described. The study of its physical properties is significantly simplified ... -
Exfoliating Two-Dimensional Layered Materials: Solvent Interactions from First-Principles
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Two dimensional materials, such as graphene, MoS2 and hexagonal boron nitride, show wide ranging electronic and mechanical properties which make applications such as transistors, pressure sensors and protective coatings ... -
Gas phase controlled deposition of high quality large-area graphene films
(2010)A gas phase controlled graphene synthesis resembling a CVD process that does not critically depend on cooling rates is reported. The controllable catalytic CVD permits high quality large-area graphene formation with deft ... -
Graphene-nonlinear optical properties and modelocking capabilities
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)In this thesis, graphene saturable absorber mirror's (SAM) potential for mode-locking ultrafast lasers has been demonstrated, in particular at 2 μm. The saturable absorption of graphene thin films (prepared via drop-casting ... -
High Performance Na-O2 Batteries and Printed Microsupercapacitors Based on Water-Processable, Biomolecule-Assisted Anodic Graphene
(2020)Integrated approaches that expedite the production and processing of graphene into useful structures and devices, particularly through simple and environmentally friendly strategies, are highly desirable in the efforts to ... -
High-Concentration Solvent Exfoliation of Graphene.
(Wiley-Blackwell, 2010)We demonstrate a method to prepare graphene dispersions at high concentrations, up to 1.2 mg/ml, with yields of up to 4wt% monolayers. This process relies on low-power sonication for long times, up to 460 hours. TEM shows ... -
The importance of repulsive potential barriers for the dispersion of graphene using surfactants
(2010)We have dispersed graphene in water, stabilized by a range of 12 ionic and non-ionic surfactants. In all cases, the degree of exfoliation, as characterized by flake length and thickness, was similar. The dispersed flakes ... -
Impurity invisibility in graphene: Symmetry guidelines for the design of efficient sensors
(2016)Renowned for its sensitivity to detect the presence of numerous substances, graphene is an excellent chemical sensor. Unfortunately, which general features a dopant must have in order to enter the list of substances ... -
Indirect Exchange and RKKY Interactions in Magnetically-Doped Graphene
(2013)Magnetically-doped graphene systems are potential candidates for application in future spintronic devices. A key step is to understand the pairwise interactions between magnetic impurities embedded in graphene that are ... -
Large magnetoresistance in few layer graphene stacks with current perpendicular to plane geometry
(2012)Large magnetoresistance (MR) effect of few layers graphene between two non-magnetic metal electrodes with current perpendicular to graphene plane was studied. A non-saturation and anisotropic MR with the value over 60% at ... -
Lateral Size Selection of Surfactant-Stabilised Graphene Flakes using Size Exclusion Chromatography
(2012)Aqueous dispersions of graphene, stabilised by a surfactant, have been separated according to lateral flake size using size exclusion chromatography. Transition electron microscopy was used to characterise the flake size ... -
Liquid exfoliation of defect-free graphene
(2013)Due to its unprecedented physical properties, graphene has generated huge interest over the last 7 years. Graphene is generally fabricated in one of two ways: as very high quality sheets produced in limited quantities by ... -
Machine-learning approaches for the enhancement of 2D and 3D electron microscopy data
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Electron microscopy allows academic and industrial users to investigate the structure and properties of a variety of materials. However, some limitations are imposed by the instrumentation and the nature of the analyzed ... -
Magnetization profile of magnetic impurities in graphene nanoribbons
(2011)The magnetic properties of graphene-related materials, and in particular, the spin-polarized edge states predicted for pristine graphene nanoribbons (GNRs) with certain edge geometries have received much attention recently ...