Physics (Theses and Dissertations): Recent submissions
Now showing items 181-200 of 458
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Molecular Engineering of perylene derivatives for opto-electronic applications
(Trinity College (Dublin, Ireland). School of Physics, 2010)The overall objective of this material science study is to investigate the physical, chemical and optical properties of perylene derivatives with a view to understanding how these properties affect their applications in ... -
Theoretical studies of carbon nanotubes interacting with magnetic atoms
(Trinity College (Dublin, Ireland). School of Physics, 2009)The past twenty years have seen an enormous increase in interest in the properties of low dimensional systems. Carbon nanotubes are an example of one such system. They possess remarkable physical properties which it is ... -
Mechanical and morphological properties of carbon nanotubes polymeric composites
(Trinity College (Dublin, Ireland). School of Physics, 2009)Carbon nanotubes (CNT) are incorporated to the polymers to enhance their electrical and mechanical properties. All of the samples in this thesis were prepared from the liquid phase using the solution casting method. The ... -
Resonant soft X-ray spectroscopic studies of certain transition metal oxides
(Trinity College (Dublin, Ireland). School of Physics, 2011)Rutile-type transition-metal oxides are extremely fertile areas of study both for fundamental and technological reasons due to the range of physical properties they present, such as insulating TiO2, semiconducting Sn02 and ... -
Spin-flip inelastic electron spectroscopy
(Trinity College (Dublin, Ireland). School of Physics, 2012)Recent experimental advances in scanning tunneling microscopy make the measurement of the conductance spectra of isolated and magnetically coupled atoms on nonmagnetic substrates possible. The typical example is that of ... -
Factors controlling the dispersion of single walled carbon nanotubes and hexabenzocoronene in liquid media
(Trinity College (Dublin, Ireland). School of Physics, 2012)In this thesis, some of the primary factors controlling liquid phase dispersion of sp2-hybridised carbon nanostructures (namely single walled carbon nanotubes (SWNTs) and hexa-peri-hexabenzocoronene (HBC)) were investigated. -
An experimental investigation of metal phthalocyanine-germanium interfaces
(Trinity College (Dublin, Ireland). School of Physics, 2009)Hybrid organic-inorganic devices present interesting possibilities for the growing field of organic semiconductors. The interface within these devices plays an im portant role in their performance, and as they decrease in ... -
Electrical characterization of polymer nanocarbon composites and high yield exfoliation of graphene
(Trinity College (Dublin, Ireland). School of Physics, 2009)The high aspect ratio, outstanding mechanical properties and high conductivity of carbon nanotubes makes them ideal candidates for polymer reinforced conducting composites. Solution processed composites, based on ... -
Statistical studies of on-line complex systems : a social network and a betting exchange
(Trinity College (Dublin, Ireland). School of Physics, 2011)In recent years, the complexity that arises out of collective social and economic behaviour has become a popular research subject for physicists. In particular, the fields of complex network science and econophysics have ... -
Monte Carlo study of dilute magnetic semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2009)This thesis is primarily concerned with the development and testing of various models explaining the magnetic properties of semiconducting oxides doped with highly dilute concentrations of a magnetic impurity. Taking ZnO:Co ... -
Modification of anisotropy in ultra-thin magnetic layers
(Trinity College (Dublin, Ireland). School of Physics, 2010)The areal density of modem magnetic storage stands somewhere between 200-300 Gb/in2. The scaling of current continuous medium technology is expected to reach a limit below 1 Tb/in2. Future technologies require discontinuous ... -
Signal quality monitoring for optical communications networks
(Trinity College (Dublin, Ireland). School of Physics, 2010)The subject of this thesis is optical performance monitoring for transparent optical communications networks. To this end, a series of techniques for the characterisation of ultrashort telecommunications pulses were ... -
Searching for signatures of electromagnetic cascades in the intergalactic medium initiated by blazars
(Trinity College (Dublin, Ireland). School of Physics, 2012)Very high energy (VHE) y-ray astronomy has opened a new window into the Universe at the highest energies, allowing the exploration of unique astrophysical phenomena. This thesis constitutes an observational contribution ... -
Electron correlation and magnetism in molecules and solids.
(Trinity College (Dublin, Ireland). School of Physics, 2011)In order to understand the magnetic properties of solids and molecules, an accurate description of the underlying microscopic many-electron systems is required. This can be achieved through several theoretical and computational ... -
Fabrication, characterisation and applications of some organic, inorganic and organic-inorganic hybrid nanostructures
(Trinity College (Dublin, Ireland). School of Physics, 2009)This thesis describes the fabrication, characterisation and applications of some interesting one-dimensional and two-dimensional nanostructures. The bulk of the thesis is concerned with the deposition of metals, polymers, ... -
Plume dynamics in nanosecond and femtosecond laser ablation of metal
(Trinity College (Dublin, Ireland). School of Physics, 2010)This thesis examines the ablation plume produced from nanosecond and femtosecond laser ablation of metal targets in vacuum. Optical emission and absorption spectroscopy, a time-of-flight Langmuir ion probe and ablation ... -
Influence of magnetic fields on cathodic growth of phases in acidic sulphate and acidic copper sulphate systems
(Trinity College (Dublin, Ireland). School of Physics, 2011)Industrial processes involving copper electrolysis are important in modern society. In these processes copper ions contained in aqueous solution are crystallized onto a cathode by the passage of current. Copper industry ... -
Micromechanical inking and printing of nano-objects using a nanoindenter and electromechanical testing of nanomaterial films
(Trinity College (Dublin, Ireland). School of Physics, 2012)As research changes focus from traditional silicon based electronic devices towards new materials with exotic capabilities such as carbon nanotubes, nanowires and graphene, the ability to create, pick up and place devices ... -
Novel observations in internal conical diffraction
(Trinity College (Dublin, Ireland). School of Physics, 2015)Internal conical diffraction occurs when a beam of light is incident along an optic axis direction in a biaxial material. The beam transforms into a hollow skewed cone inside the material and refracts upon exiting. The ... -
Investigation of copper chloride for photonics applications
(Trinity College (Dublin, Ireland). School of Physics, 2011)Wide band gap semiconductors have found multiple applications. Being light emitters in the range of blue and UV, materials like GaN or ZnO have been applied to highly efficient blue light emitting diodes, and increasingly ...
