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 29 for “"nanopillars"”.
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Electroless Silver Deposition on (100) and (111) Silicon Wafers, Fabrication of Nanowires and Nanopillars by Assisted Etching
… struttura risultante è un insieme ordinato di Nanopillars con dimensione media di 600nm.
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Geometry Dependent Plasmonic Activities of a Self-assembled Hexagonal Lattice and a Periodic Hexagonal Lattice with Gold Nanopillars
<p>Metal nanostructures play a crucial role in the emerging field of nanotechnology because they overcome the diffraction limitation. Plasmonic activities in metal nanostructures have the ability to scatter and absorb light at nanometer dimensions. There are several types of nanofabrication …
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Atomistic Modeling of Nanostructures via Molecular Dynamics and Time-Scaling Methods
… with the twin spacing and the finite size of nanopillars by molecular dynamics. Simulations reveal that there exists an optimal aspect ratio for which the yield strength of twinned nanopillars is higher than even single crystal nanopillars. In addition, it is observed that twin boundaries …
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Experimental Measurements by Antilocalization of the Interactions between Two-Dimensional Electron Systems and Magnetic Surface Species
… between ferromagnetic Co$_{0.6}$Fe$_{0.4}$ nanopillars and the relatively distant InGaAs quantum well. With these CoFe nanopillars, a decrease in spin decoherence time is observed, attributed to the spatially varying magnetic field from the local moments. A good agreement between the data …
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Voltage Control of Magnetism in Novel Structured Vertically Aligned Nanocomposite Thin Films
… ionic migration and device durability. Epitaxial nanopillars, fabricated using a novel method based on VAN structures, can offer just that. This work demonstrates significant advancement in MI systems, achieving large changes in magnetic moment saturation (mS) and coercivity (HC) in CoFe2O4 …
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IN VITRO MODULATION OF HUMAN CORNEAL ENDOTHELIAL CELL BEHAVIOR VIA TOPOGRAPHICAL AND BIOCHEMICAL CUES
… cues are used. The topographies that we test are nanopillars, microwells, and micropillars. The biochemical cues are extracellular matrix coating of fibronectin-collagen I, FNC Coating Mix, and laminin-chondroitin sulfate. Our results indicate that topographical and biochemical cues are able to …
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Critical Current Enhancement In Magnetic Spin-Transfer Nano-Devices Through Doping With The Rare Earth Terbium
In this thesis, we fabricate magnetic nanopillars and dramatically enhance their damping through terbium doping in order to suppress the various spin-transfer effects, to the potential benefit of magnetic hard drive read head technology. This enhancement is much stronger at lower temperatures, and …
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Development of optical field emitter arrays
… structures, including vertically-standing gold nanopillars and silicon tips, in-plane gold nanostructures, and metallic line gratings, were performed via theoretical analysis and numerical simulations. Enhancement of the optical nearfield and power absorption was achieved by geometrical and …
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Scalable Electrochemical Surface Enhanced Raman Spectroscopy (EC-SERS) for bio-chemical analysis
… the impedance properties of MWCNT/polymer nanopillars in the electrolyte.
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Remote-Controlled Self-Assembly of Three-Dimensional Micro Structures for Ultra-Sensitive Sensors and Three-Dimensional Metamaterials
… MMs contain thousands of metallic nanopillars with nanoscale dielectric gaps between them. Forming the MMs with nanopillars and nano gaps decreases the Ohmic energy loss in the resonator and increases the energy storage in the dielectric nano gaps, thus an enhanced Q-factor up to …
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Synthesis and properties of transition-metal arsenide nanostructures: from superparamagnetism to superconductivity
… nanostructures (nanoparticles, nanowires, nanopillars etc.) simultaneously is not easy. Papers I and II showcase novel synthesis methods for E based pnictides [EPn where E = 1st row transition elements and Pn = P, As etc.]. The superparamagnetism of transition-metal pnictides (e.g. FeAs, …
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Nanoarchitectured Energy Storage Devices
… highly ordered manganese dioxide (MnO2) nanopillars is introduced. The SNAP method that is further modified to develop carbon nanoarray electrodes is also discussed. Subsequently, a template-free method to develop high aspect ratio copper oxide nanowhiskers on copper substrate is …
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Nano-structured materials for optoelectronic devices
… a TIPS-pentacene solar cell based on ZnO nanopillars. Recently perovskites have emerged as a promising semiconductor for optoelectronic applications. We demonstrate a perovskite light-emitting diode that employs perovskite nanoparticles embedded in a dielectric polymer matrix as the …
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Spin transport through nanopillar superconducting spin valves
… into current-perpendicular-to-plane (CPP) nanopillars using optical lithography and Ar ion milling followed by focused ion beam milling. Magnetic and electrical characterisation of these devices at temperatures between 0.3-10 K demonstrate a decrease of magnetoresistance (increasing spin …
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From fano to nano: mechanisms and applications of surface enhanced raman spectroscopy
… a subsequent study, leaning gold-covered silicon nanopillars are analysed where plasmonic interference and ‘substrate-solution hydrophobic effects’ are provided as explanations for the magnitudes and patterns of SERS enhancements observed via numerical studies. This is alongside a more …
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Nanomechanics of Glassy Polymers Under Confinement
… the mechanical properties of confined model nanopillars, which have not been previously simulated in the context of polymer glasses, and develop close phenomenological connections between polymer glasses and metallic glasses by looking at the local non-affine strain. Lastly, in Chapter 6, we …
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Template-directed Assembly of Silk in Advanced Materials for Food Security
… of vertically aligned silk nanotubes and nanopillars are fabricated by template wetting-guided material assembly, with applications in anti-fouling, oil-water separation and as packaging materials with improved gas barrier properties.
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Micro- and nanoscale features of insect cuticle and their impacts on wetting, friction, and optical properties
… unique structures such as setae, microtrichia, nanopillars, sculpticells, or gratings. The adaptive roles of these cuticular architectures have become a recent area of interest, notably to serve as inspiration for the creation of novel materials because they result in desirable functionalities …
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Magnetoelectric Oxide Nanocomposite Heterostructures
… (i) I utilized self-assembled BFO nanopillars in a BFO-CFO two phase layer on (111) STO as a seed layer on which to deposit a secondary top BiFeO3 layer. The growth mechanism and multiferroic properties of these new heterostructures were investigated. (ii) I demonstrated the …
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Controlling exciton dimensionality in novel transition-metal dichalcogenide platforms
… than previous reports. I use an array of nanopillars to deterministically strain confine these interlayer excitons to zero dimensions and show them to have sufficiently long lifetime, up to ∼4 μs, to enable the investigation of quantum spin models. Next, I demonstrate one-dimensional …
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