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 1068 for “"NANOSTRUCTURES"”.
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Growth and characterization of carbon nanostructures on zinc oxide nanostructures
… materials based on ZnO and carbon hierarchical nanostructures, and to test their performances when used as chemiresistors to detect low doses (~ ppm) of polluting gases, like ammonia and acetone. Nanostructures of ZnO and carbon, including carbon nanotubes, exhibit on their own exceptional …
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Selective SiGe nanostructures
Selective epitaxial growth (SEG) of SiGe on patterned SiO2/Si substrates by ultra-high vacuum chemical vapor deposition (UHVCVD) shows promise for the fabrication of novel SiGe microelectronic structures. This work explores selective growth conditions in the SiH2Cl2/SiH4/GeH4/H2 system between …
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Semiconductor nanostructures for device applications
… This work shows that simply synthesized CuO nanostructures have great potential for the fabrication of efficient and reliable chemical sensors. Section3 , we reported the high-yield facile synthesis, detailed characterization and photocatalytic application of α-Fe2O3 nanoparticles. The UV-Vis …
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Templated growth of platinum nanostructures
Novel platinum nanostructures were synthesized by templating the growth of platinum on treated polymer surfaces and within disk-like aqueous bicellar assemblies. The growth mechanisms of all structures were examined in detail. Platinum hollow nanospheres with uniform shell thickness were prepared …
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Multifunctional and Responsive Polyelectrolyte Nanostructures
… metal ions in PECs to fabricate functional PEC nanostructures. The research investigates the effect of the interactions between different metal ions and polyelectrolytes on the morphology and properties of PECs, explore the fabrication of different structures using embedded metal ions and …
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Multiphysics simulations of magnetic nanostructures
Multiphysics simulations of magnetic nanostructures by Matteo Franchin.<br/><br/>In recent years the research on magnetism has seen a new trend emerging, characterised by considerable effort in developing new nanostructures and finding new ways to control and manipulate their magnetisation, such as …
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Acoustic mode quantization in nanostructures
… the confined acoustic modes of three different nanostructures, viz. silica and polystyrene nanospheres, hollow carbon microspheres, and GeO2 nanocubes. The confined acoustic modes observed show significantly different features from those of the corresponding bulk. Based on elasticity theory, the …
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Optical properties of SiGe nanostructures
In this thesis, Raman Scattering (RS) and photoluminescence (PL) measurements of Ge nanowires (NWs) grown via vapor-liquid-solid (VLS) using chemical vapor deposition silicon substrates consisting of (100) and (111) crystallographic orientations are reported. Ge NWs grown are ~40 nm in diameter, …
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Electrochemical fabrication of AuCo nanostructures
… etched from CoAu nanowires, rough, porous gold nanostructures will be left behind, which could be used as novel catalysts. In this study, the electrodeposition of Au/CoAu multilayered nanowires and nanotubes in nanoporous templates was explored from a non-cyanide electrolyte. The multilayers …
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Transport properties of DNA nanostructures
… the global structure and dynamics of the DNA nanostructures. Recently, an atomic-level model of DNA origami in situ has also been obtained, which showed considerable deviation from the idealized structure. A few experimental studies reported the ionic permeability of DNA origami constructs …
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Exchange bias in patterned nanostructures
… of the properties of exchange biased nanostructures such as domain formation, magnetostatic interactions, and response to field-driven switching. -A fabrication method for creating locally exchange biased nanostructures is first developed. By etching back a predeposited FM film, and …
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Charge detection in semiconductor nanostructures
In this thesis nanometer scale charge sensors are used to study charge transport in two solid state systems: Lateral GaAs quantum dots and hydrogenated amorphous silicon (a-Si:H). In both of these experiments we use time-resolved charge sensing to study electron transport in regimes that are not …
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Ceramic nanostructures for block copolymers
… in order to produce both porous and relief nanostructures. The interest in using these materials is due to the unique morphologies that block copolymers form and the fact that these nanostructures do so by self assembly. With careful selection of the relative volume fraction and phases, …
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Magnetic Excitations in Cylindrical Multilayered Nanostructures
The fabrication of magnetic nanowires and nanotubes, along with experimental studies, have motivated a theory of spin waves (SW) in ferromagnetic and antiferromagnetic cylindrical systems. The calculations are applied to situations where the external magnetic field is parallel to the cylindrical …
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Metal oxide nanostructures and their applications
Recently, researchers on nanoparticles and nanostructures has received a great deal of attention not only in the area of synthesis and characterization but also in their potential application in various high-technological applications. Nanomaterials are widely used not only for environmental and …
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Synthesis of Perylenediimide-Functionalized Silsesquioxane Nanostructures
<p>Organic semiconductors functionalized nanostructures are becoming as promising materials for electronic device applications including organic photovoltaics (OPVs). Perylenediimide (PDI) derivatives have also been known as one of the best n-type organic semiconductors. PDI derivatives can form …
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Hybrid Nanostructures for Artificial Machine Olfaction
<p>The detection of low level concentrations of particles in a gaseous environment is of importance to many fields, especially Homeland Security. The ability to identify ppb concentrations of explosives and their degradation products can aid in the detection of improvised explosive devices (IEDs), …
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