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Cuardach Reatha:
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Ag Taispeaint Torthaí 201 - 225 de 3195 ar leathanach 9 de 128
Marcáilte
Marcáil
Ferromagnetic resonance of magnetite films and iron nanowires
(2010)
McGuigan, Louise
Ferromagnetic resonance of magnetite films and iron nanowires
(2010)
McGuigan, Louise
Achomaireacht:
THESIS 9021
Ferromagnetic resonance (FMR) measurements were carried out at 9.6 GHz on thin magnetite films and iron nanowire arrays, produced by molecular beam epitaxy (MBE). The aims of the studies were to examine how the magnetic anisotropy is affected by film thickness, the deposition substrate material, post-deposition annealing, and deposition on a stepped substrate. For films deposited on MgO, we found that the cubic anisotropy field, H4||, decreased with an increase in film thickness. This decrease was accompanied by an increase in the mean FMR peak-to-peak linewidth, which indicates a decrease in the film quality. H4|| was seen to increase after annealing for just 4 minutes in air at 250?C, with this change being accompanied by a significant decrease in the linewidth. We propose that the annealing treatment is altering the defects within the films, and increasing the magnetic ordering. A further anneal of 156 minutes did not affect the observed H4||, and the linewidth wa...
http://hdl.handle.net/2262/79244
Marcáilte
Marcáil
Interactions at nano-bio interfaces
(2011)
Rakovich, Aliaksandra
Interactions at nano-bio interfaces
(2011)
Rakovich, Aliaksandra
Achomaireacht:
THESIS 9541
The development of new materials that can be integrated into current technologies is one of the most important challenges of today. As a result, fields such as nanotechnology and biotechnology have seen great advances. More recently, a link between these two fields has been established and has resulted in nano-biosciences being considered to be an important economic factor by many. The field of nanobiotechnology continuously test the boundaries and promises many breakthrough results in the near future. The purpose of this work was thus to add to and advance this very promising field with an emphasis on biomolecuies with technologically exploitable properties. In order to achieve this, the interactions between nanomaterials and biomaterials were studied at nanoscale, with further investigations into the effects that these interactions have on the functionalities of biomolecules. Three model systems were chosen for the investigations based on the range of potential app...
http://hdl.handle.net/2262/79321
Marcáilte
Marcáil
The complex dynamics of flowing foam
(2014)
Sexton, Michael B.
The complex dynamics of flowing foam
(2014)
Sexton, Michael B.
Achomaireacht:
THESIS 10340
We investigate the link between the non-linear macroscopic rheology of wet foams and the microscopic interactions at the bubble-scale, within the general framework of foams as a complex system. This rheology has been found to be well described in simulation by the soft disk model, which represents the bubbles in a two-dimensional foam as a series of overlapping disks, interacting via an elastic repulsion and a viscous dissipation. We simulate linearly sheared systems over a large range of strain rates, showing, for the first time in sinuilation, the transition between two regimes well-known from experiment; a low-strain regime with swirling, strongly non-affine motion, and a high strain rate regime comprising of laminar flow.
http://hdl.handle.net/2262/79346
Marcáilte
Marcáil
Surface-enhanced Raman spectroscopy and fluorescence spectroscopy towards detection of pterins
(2013)
Smyth, Ciar?n
Surface-enhanced Raman spectroscopy and fluorescence spectroscopy towards detection of pterins
(2013)
Smyth, Ciar?n
Achomaireacht:
THESIS 10286
In this thesis, a preliminary study is conducted into surface-enhanced Raman spectroscopy (SERS) and fluorescence spectroscopy towards the detection and analysis of pterins. Firstly, investigation of some optical properties of various pterin species is considered, using absorption and fluorescence spectroscopy. Silver colloids for SERS anlaysis are then investigated, particularly concerning substrate reproducibility and analysis optimisation. Complementary to the study of using silver colloids is the investigation of SERS using two nanoparticulate substrates, prepared using pulsed laser deposition (PLD) and electron beam evaporation (EBE). These materials are also characterised according to their SERS reproducibility and the PLD films are compared to a commercial substrate. The appendices consider other materials and techniques used during the project, and an outlook for future work is also presented.
http://hdl.handle.net/2262/79354
Marcáilte
Marcáil
Study of the properties of networks of low-dimensional nanomaterials for transparent flexible device applications
(2013)
Sorel, Sophie
Study of the properties of networks of low-dimensional nanomaterials for transparent flexible device applications
(2013)
Sorel, Sophie
Achomaireacht:
THESIS 10342
Transparent conductors (TC) - materials that are both transparent and conductive - are of great interest for modern technologies. However, a replacement is needed for the most commonly used TC, Indium tin oxide (ITO), because it requires high temperature processing and lacks flexibility, which is a critical requirement for future applications. Networks of silver nanowires are an excellent candidate for transparent flexible applications. In this work, I made a range of networks - with different thicknesses - of silver nanowires - with different lengths and diameters - in order to understand the effects of the aspect ratio of silver nanowires on the networks' opto-electrical properties.
http://hdl.handle.net/2262/79357
Marcáilte
Marcáil
Investigation of organic / ferromagnet interface and magnetoresistive characteristics of small molecule organic semiconductors
(2013)
Tokuc, Huseyin
Investigation of organic / ferromagnet interface and magnetoresistive characteristics of small molecule organic semiconductors
(2013)
Tokuc, Huseyin
Achomaireacht:
THESIS 10254
Spin injection, transport and dynamics in organic semiconductors are of growing interest as the field of organic spin electronics begins to take shape during the last decade. This new field of research aims to manipulate the electron spin degree of freedom in organic based electronic devices, such as organic-light emitting diodes, organic field effect transistors, and organic radio-frequency identification tags. Organic materials offer the promise to future lightweight, low-power, and inexpensive electronics on flexible substrates.
http://hdl.handle.net/2262/79375
Marcáilte
Marcáil
CrO2 : a general study
(2000)
Barry, Amanda
CrO2 : a general study
(2000)
Barry, Amanda
Achomaireacht:
THESIS 5336
The aims of this work were (i) to prepare chromium dioxide, CrO2, in thin film and powder form (ii) to study its magnetic, electronic and thermal properties and (iii) to introduce thin films of CrO2 into a multilayer device structure and study its transport properties.
http://hdl.handle.net/2262/79443
Marcáilte
Marcáil
Atomic scale influences on the tribology of nano to meso-scale systems
(2015)
Annett, James
Atomic scale influences on the tribology of nano to meso-scale systems
(2015)
Annett, James
Achomaireacht:
THESIS 10688
It has been known for many years that atomic scale effects can directly influence the tribological behaviour over a wide variety of contact sizes ranging from the nano-scale to macroscale. A newly developed load and depth sensing three dimensional nano-contact system has been used to investigate and experimentally characterise new ways in which atomic scale properties can influence the behaviour of nano to meso-scale contacts in room temperature ambient conditions.
http://hdl.handle.net/2262/79468
Marcáilte
Marcáil
Cerium dioxide redox cycle for fuel production
(2015)
Bulfin, Brendan
Cerium dioxide redox cycle for fuel production
(2015)
Bulfin, Brendan
Achomaireacht:
THESIS 10497
The following thesis covers a number of topics related to thermochemical fuel production using the CeO2 redox cycle. Chapter 1 gives an introduction to the topic, providing motivation, historical development and the main physical properties of thermochemical fuel production with emphasis on the ceria redox cycle. The following chapters tackle three separate topics; an analytical description of the ceria redox system, a thermochemical analysis of this fuel production technology and finally an investigation of the effect of dopants on the oxidation and reduction kinetics.
http://hdl.handle.net/2262/79500
Marcáilte
Marcáil
A considered application of the Langreth-Lundqvist van der Waals density functional in the context of : open shell molecules, atom centered basis sets, adsorption of graphene into a Bi?Se? slab
(2015)
Cathcart, Thomas
A considered application of the Langreth-Lundqvist van der Waals density functional in the context of : open shell molecules, atom centered basis sets, adsorption of graphene into a Bi?Se? slab
(2015)
Cathcart, Thomas
Achomaireacht:
THESIS 10588
The work in this thesis is aimed towards exploring the edge case application of the Langreth-Lundqvist vdW density functional (vdW-DF). The increasing popularity of the vdW-DF functional has resulted in its application across a wide variety of systems. Some of these systems are at the limit of the approximations made in the derivation of the functional, so called edge case systems. Although the vdW-DF functional may break down when applied to these edge case systems, through careful exploration of these systems we gain a greater understanding of not only the functional but also ways within which it can be improved.
http://hdl.handle.net/2262/79520
Marcáilte
Marcáil
Variation of the electronic functionality of self-seeded germanium nanowires through synthesis determined core-shell interface states
(2015)
Connaughton, Stephen
Variation of the electronic functionality of self-seeded germanium nanowires through synthesis determined core-shell interface states
(2015)
Connaughton, Stephen
Achomaireacht:
THESIS 10692
Bottom up grown germanium nanowires may have an important role to play in future electronic devices. While the electrical properties of nanowires grown using a metallic seed as a catalyst have been extensively reported we study self-seeded nanowires in this thesis. Such wires are core-shell in nature and are grown without any intentional doping. Self-seeded nanowires have been previously proposed as an attractive alternative to conventionally grown wires due the alleviation of complications arising from unintentional doping from the metallic seed.
http://hdl.handle.net/2262/79530
Marcáilte
Marcáil
Young brown dwarfs and their environments : testing star and planet formation
(2014)
Dawson, Paul
Young brown dwarfs and their environments : testing star and planet formation
(2014)
Dawson, Paul
Achomaireacht:
THESIS 10767
This thesis presents a new contribution to our understanding of the formation of brown dwarfs. From a description of their discovery, to an analysis of their disks and photospheres, it sheds new light on the conditions under which stars, brown dwarfs, and planets, form and evolve. It explores new challenges to further studies of young brown dwarfs, and offers a means of advance.
http://hdl.handle.net/2262/79556
Marcáilte
Marcáil
Modification and analysis of layered materials with charged particle beams
(2014)
Fox, Daniel
Modification and analysis of layered materials with charged particle beams
(2014)
Fox, Daniel
Achomaireacht:
THESIS 10385
In this work a range of highly focused charged particle beams were used to modify the structure and geometry of materials. Recently discovered two-dimensional (2D) materials were the focus of the work. Fundamental studies on the beam-sample interactions were conducted. This knowledge was then used to achieve nanoscale control of the modification.
http://hdl.handle.net/2262/80025
Marcáilte
Marcáil
A theoretical study of the strain-modified RKKY interaction in magnetically doped carbon materials
(2015)
Gorman, Paul D.
A theoretical study of the strain-modified RKKY interaction in magnetically doped carbon materials
(2015)
Gorman, Paul D.
Achomaireacht:
THESIS 10636
Graphene-related materials continue to be in the scientific limelight due to near-continuous discoveries regarding their properties and production. The applications envisaged for these super materials are numerous and varied across many disciplines. In addition to this, the simplicity with which the physical properties of these materials can be described makes them particularly popular in theoretical examinations, where the simple dispersion relation for their electrons is of key utility. In this thesis we will examine a number of topics relating to graphene systems, focusing on those doped with magnetic impurities. We will utilize a combination of analytical and numerical methods to explore these topics in graphene and carbon nanotubes.
http://hdl.handle.net/2262/80052
Marcáilte
Marcáil
Electrochemical energy storage properties of solution processed nanomaterial networks
(2015)
Higgins, Thomas M.
Electrochemical energy storage properties of solution processed nanomaterial networks
(2015)
Higgins, Thomas M.
Achomaireacht:
THESIS 10897
Recently, exciting progress has been made towards the creation of electronic devices via unconventional fabrication routes. For example, liquid processing techniques such as printing and spraying are enabling the production of nanomaterial-based electronic devices that are assembled directly on everyday substrates, such as plastic films. This approach is interesting as it presents an opportunity to develop electronic devices that are mechanically flexible and even transparent. Clearly, these possibilities will lead to a host of applications that are impossible using traditional manufacturing techniques.
http://hdl.handle.net/2262/80070
Marcáilte
Marcáil
Physics in the extreme: X-ray and optical studies of magnetic white dwarfs and related objects
(2017)
Kennedy, Mark
Physics in the extreme: X-ray and optical studies of magnetic white dwarfs and related objects
(2017)
Kennedy, Mark
Achomaireacht:
In this thesis, we present results from optical and X-ray studies of compact binary systems. These observations are used to constrain orbital parameters - mainly periods and inclinations for several cataclysmic variables - and examine the accretion structures within the systems. In Chapters 3 and 4, optical and X-ray studies of two interesting cataclysmic variables systems, Lanning 386 and MASTER OTJ192328.22+612413.5, are presented. The X-ray and optical data of these objects suggest that both systems have a high inclination and harbour weakly magnetic white dwarfs with spin periods 17-22 min. There is also a strong focus on studying the long term behaviour in intermediate polars in this thesis. Chapter 5 presents results from Kepler observations of FO Aquarii taken over 69 consecutive days. The shape of the light curve is consistent with the outer edge of the accretion disc being eclipsed and the detected period is longer than the last reported period of 1254.284(16) s, suggesting...
http://hdl.handle.net/10468/4038
Marcáilte
Marcáil
Contact interface studies of metal and carbon electrodes to germanium nanowires, carbon nanotubes and thin carbon films in associated devices
(2013)
Lutz, Tarek
Contact interface studies of metal and carbon electrodes to germanium nanowires, carbon nanotubes and thin carbon films in associated devices
(2013)
Lutz, Tarek
Achomaireacht:
THESIS 10451
In current state-of-the art electronic devices the electrical contact between source- and drain-electrode plays a crucial role in the performance of the nano size devices. Especially for carbon based materials such as carbon nanotubes and thin graphite layers, the electrical contacting issues become more and more critical to develop carbon based electronic devices. In the present thesis the correlation between charge- injection, of in terms of contact-resistance and specific contact resistivity into a nano-object or nanostructured material and the associated morphology of the contact- interface region, by transmission electron means, is investigated.
http://hdl.handle.net/2262/80300
Marcáilte
Marcáil
Molecular electronics: first principles and model approaches
(2015)
Melo Souza, Amaury de
Molecular electronics: first principles and model approaches
(2015)
Melo Souza, Amaury de
Achomaireacht:
THESIS 10665
This thesis deals with the application and the development of computational tools for the study of ground state and electronic transport properties of molecular junctions. The calculations can be divided in two main categories, depending on whether they are based on first-principles or model Hamiltonians, respectively. From the point of view of first- principles calculations, the ground state properties are studied within density functional theory (DFT) and the electronic transport within the non-equilibrium Green?s functions (NEGF) formalism. From the point of view of model Hamiltonians, the electronic transport is calculated by means of the density matrix formalism by solving master equations (ME), where all the parameters can be obtained from first-principles calculations. These approaches allow us to study the electronic transport in different regimes: for strong electrode-molecule coupling, where tunneling is the doming mechanism, as well as for weak electronic...
http://hdl.handle.net/2262/80348
Marcáilte
Marcáil
Design and characterization of widely tunable semiconductor lasers based on etched slots
(2015)
Nawrocka, Marta
Design and characterization of widely tunable semiconductor lasers based on etched slots
(2015)
Nawrocka, Marta
Achomaireacht:
THESIS 10558
Tunable semiconductor lasers play an important role in numerous technologies for optical communication and sensing systems. They are widely used in dense wavelength division multiplexed (DWDM) systems and in other important markets such as trace gas detection for environmental emission motoring. Tunable lasers are also becoming a key component in optical packet and burst switching systems to reduce the latency and increase the capacity of current optical transmission networks.
http://hdl.handle.net/2262/80420
Marcáilte
Marcáil
Femtosecond laser ablation of metals
(2015)
O'Connell, Gearoid
Femtosecond laser ablation of metals
(2015)
O'Connell, Gearoid
Achomaireacht:
THESIS 10560
Femtosecond laser ablation of metals and dielectrics is currently very topical due to its new and distinctive ablation process and the growing number of applications. The ablation process is rather complex and results in the formation of two distinct plumes, a fast, atomic component, and a slow component comprised mainly of nanoparticles. This thesis describes the results of an investigation into the femtosecond laser ablation of some metals. The experiments were performed for gold, silver, aluminium and tin to compare the differences in their ablation behaviour.
http://hdl.handle.net/2262/80440
Marcáilte
Marcáil
The structure and flow of disordered wet foams
(2014)
O'Donovan, Cathal B.
The structure and flow of disordered wet foams
(2014)
O'Donovan, Cathal B.
Achomaireacht:
THESIS 10834
This thesis concerns the structure and flow properties of wet foams. We primarily use computer simulations of soft particles to model the behaviour of disordered wet foams. We investigate the properties of 2D and 3D polydis- perse packings of soft particles and the flow of 2D soft discs as model systems for wet foams.
http://hdl.handle.net/2262/80446
Marcáilte
Marcáil
Liquid phase exfoliation and dispersion of two dimensional materials
(2014)
Smith, R?n?n
Liquid phase exfoliation and dispersion of two dimensional materials
(2014)
Smith, R?n?n
Achomaireacht:
THESIS 10804
Over the last few years, it has become clear that due to their high surface area and novel properties, two dimensional materials will be extremely useful both for fundamental studies and for a range of applications. Previous work has shown that graphene can be produced in large quantities by exfoliation of graphite in certain solvents or surfactants. Of these methods, surfactant dispersion is perhaps the most promising because the use of toxic solvents is avoided. Although previous work has shown that such methods give reasonably large quantities of good-quality graphene, there is still much scope for improvement as well as further investigation.
http://hdl.handle.net/2262/80512
Marcáilte
Marcáil
Tuning and characterization of self-assembled plasmonic nanoparticle arrays
(2015)
Ualibek, Oral
Tuning and characterization of self-assembled plasmonic nanoparticle arrays
(2015)
Ualibek, Oral
Achomaireacht:
THESIS 10517
This thesis details the development and use of a novel nano-entity fabrication technique. The technique is based on a glancing angle deposition (GLAD) on transparent stepped templates. It is demonstrated that the technique is functionally independent of the deposited material as evidenced by the growth of ordered nanoparticle (NP) arrays of Ag, Au and Cu. Furthermore, the morphology of the systems grown can be changed through choice of the deposition parameters. This allows a complete tuning of the plasmonic resonances measured mainly with reflectance anisotropy spectroscopy. Finally, the self-assembled noble metal NP arrays have been used as building blocks for Surface Enhanced Raman Spectroscopy (SERS) experiments, demonstrating a strong enhancement in the Raman signal measured.
http://hdl.handle.net/2262/80530
Marcáilte
Marcáil
Development of a cantilever based device for the investigation of malaria vaccine cross-reactivity
(2015)
Walther, Michael
Development of a cantilever based device for the investigation of malaria vaccine cross-reactivity
(2015)
Walther, Michael
Achomaireacht:
THESIS 10520
The invention of the atomic force microscope and subsequent implementation of cantilevers as transducers for sensing applications laid the foundation for the current use of cantilevers as biosensors. This application involves functionalisation of the surface with a bio-recognition layer, immersion of the sensors in a physiological environment and operation in either the static or the dynamic mode to transduce the biological interaction into a measurable signal. When operated in dynamic mode, the cantilever is actuated at its resonance frequency. Mass uptake on the sensor results in a resonance frequency shift, thereby transforming the cantilever into a sensitive microbalance.
http://hdl.handle.net/2262/80542
Marcáilte
Marcáil
Localised surface plasmon mediated energy transfer in quantum dot systems
(2015)
Zhang, Xia
Localised surface plasmon mediated energy transfer in quantum dot systems
(2015)
Zhang, Xia
Achomaireacht:
THESIS 10599
Nonradiative energy transfer to metal nanoparticles (NPs) is a technique used for optical- based distance measurements which is often implemented in sensing. Both Forster resonant energy transfer (FRET) and nanometal surface energy transfer (NSET) mechanisms have been proposed for emission quenching in proximity to metal NPs. Here quenching of emission of colloidal quantum dots (QD) in proximity to a monolayer of gold NPs is investigated. Five differently sized CdTe QDs are used to probe the wavelength dependence of the quenching mechanism as their emission peak moves from on resonance to off resonance with respect to the localized surface plasmon (LSP) peak of the Au NP layer.
http://hdl.handle.net/2262/80552
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