Physics (Theses and Dissertations): Recent submissions
Now showing items 361-380 of 458
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Mechanically alloyed Sm-Co hard magnetic materials
(Trinity College (Dublin, Ireland). School of Physics, 2002)In the recent search for new high-temperature permanent magnet materials, research has concentrated on bulk Sm2Co17-type magnets. The usual approach to development of coercivity in bulk Sm-Co based materials is to prepare ... -
The surface energetics of low dimensional nanomaterials
(Trinity College (Dublin, Ireland). School of Physics, 2017)Over the past two decades, there has been great interest in the discovery and research of low dimensional nanomaterials. These materials, such as carbon nanotubes and graphene, are amongst the strongest and most conductive ... -
The growth, formation and magnetic behaviour of noble metal capped atomic wires
(Trinity College (Dublin, Ireland). School of Physics, 2016)Transition metal nanostructures have been observed to have several interesting magnetic properties. Nanowire of atomic widths on a vicinal surfaces show these interesting properties clearly, which also vary with the width ... -
Utilising Chromium-Based p-Type Transparent Conducting Oxides in Photovoltaic Devices
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)This thesis deals with the growth of modern, highly performing p-type transparent conducting oxides and their utilisation in two types of photovoltaic devices. X-ray spectroscopic techniques are used to understand the ... -
Novel Instrumentation for High Frequency Electrical Conductivity and Magnetisation Dynamics Characterisation
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The drive toward smaller devices and faster operational speeds places a challenge on techniques for probing electrical conductivity and magnetisation dynamics. This thesis attempts to address this challenge by developing ... -
Characterisation of materials under thermal and electrical stimuli using in-situ electron microscopy and MEMS technology
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Abstract To incorporate nanomaterials into functional devices we need to fully understand the materials characteristics. This includes electrical, optical, mechanical and most important for us the thermal properties. The ... -
Photons in restricted topologies
(Trinity College (Dublin, Ireland). School of Physics, 2016)In this work we discuss three different aspects of the topological classification of propagating beams of light. This topological classification relies on global properties of the light beam, which are insensitive to local ... -
Morphology and time evolution of thermal jets associated with low-mass young stars
(Trinity College (Dublin, Ireland). School of Physics, 2016)Jets are one of the most ubiquitous processes in the Universe, observed from astrophysical objects spanning an extreme range of masses. Despite the difference in scale, the similar morphologies and other characteristics ... -
Inferring the Surface Energy Distribution of Low Dimensional Materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Two dimensional nanomaterials exhibit novel and superlative properties, as such; the last decade has seen huge research interest in 2D nanomaterials. To fully exploit these properties it is essential to ... -
Comparative study of beam-induced carbonaceous deposits in helium-ion and scanning electron microscopes.
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this work, the phenomena of beam-induced contamination in charged beam microscopes (i.e. the scanning electron microscope (SEM) and helium ion microscope (HIM)) was investigated in order to determine its influence on ... -
Exploring New and Enhanced Optical Functionalities in Coupled Nano-Systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this thesis, a variety of novel emerging systems were chosen to explore new and enhanced optical functionalities in coupled nano-systems. The coupling of novel nanomaterials with complimentary properties paves the way ... -
X-ray spectroscopic studies of the electronic structure of chromium based p-type transparent conducting oxides
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this thesis the electronic, optical, electrical, and mechanical properties of two p-type transparent conducting oxides will be explored, primarily by spectroscopic techniques. The initial chapters outline how the ... -
Passive thin film circuits of nanomaterials, inkjet printed on flexible temperature sensitive substrates
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The objective of my work is threefold, firstly, to prepare functional ink dispersions of nanomaterials at high concentration with a well-defined narrow size distribution; secondly, to pattern low resistance, semiconducting ... -
Ab Initio calculation of parameters for electron and spin transport in organic crystals
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Organic semiconductors offer several crucial advantages over their inorganic counterparts in electronic and spintronic applications. Besides offering structural advantages such as variety and flexibility, organic semiconductors ... -
Dielectric focusing elements for integrated optics
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The ability to propagate light around a `circuit' on a single chip has an abundance of applications. Connecting different elements can bring huge functionality to a minuscule device---as evidenced by integrated electronic ... -
Surface studies of (110) terminated FE304 and SRTI03
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this thesis the surface reconstructions of (110) terminated single crystalline magnetite and strontium titanate are investigated by a host of surface region sensitive techniques, foremost of those being scanning tunneling ... -
The Ecological Effects of Light Pollution: A Three Site (Bull Island, Trinity College Dublin & Killiney Hill) Comparative Study
(Trinity College Dublin, 2016)This work reports on the study of three sites within Dublin to assess the potential implications of light pollution using in situ light measurements in conjunction with species sensitivity studies. -
Modelling and Monitoring Geomagnetically Induced Currents in Ireland
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)This thesis is the first detailed study of the effects of geomagnetic storms and geomagnetically induced currents (GICs) on the Irish power network. In order to better monitor geomagnetic storms in Ireland, a network of ... -
Precise modification of 2D materials by gas ion beams
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018) -
Nanostructured Electrodes as Catalysts for the Water Splitting Reaction
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The production of hydrogen through the electrochemical water splitting reaction is an attractive energy storage solution for intermittent natural resources. This comprises of the hydrogen evolution reaction (HER) at the ...
