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 32 for “"Layer-by-layer deposition"”.
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Plasma Enhanced Layer-by-layer Deposition and Nano-crystallization of Si:H films
… and relatively easy to manufacture at low cost, by plasma enhanced chemical vapor deposition (PECVD), compared to single crystal Si. The crystalline volume fraction of nc-Si films needs to be well controlled to prevent light-induced degradation of the otherwise amorphous hydrogenated Si (a-Si:H). …
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Enhanced Column Filtration for Arsenic Removal from Water: Polymer-Templated Iron Oxide Nanoparticles Immobilized on Sand via Layer-by-Layer Deposition
Arsenic is ubiquitous in water sources around the world and is highly toxic. While precipitation and membrane filtration techniques are successfully implemented in developed cities, they are unsuitable for rural and low-resource settings lacking centralized facilities. This thesis presents the use …
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Organic Self-Assembled Layer-by-Layer Thin Films for Second-Order Nonlinear Optics
Layer-by-layer deposition techniques were used to fabricate films with second order nonlinear optical (NLO) properties. These materials are key to the development of electro-optic modulators used in fiber optic communication systems. Performance benefits and lower manufacturing costs are driving …
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Ionic Self-Assembled Multilayers Adsorbed on Long Period Fiber Gratings for Use as Biosensors
… and non-portable. Ionic Self-Assembled Multilayers (ISAMs) adsorbed on Long Period Fiber Gratings (LPGs) provides an attractive platform for building optical sensors, which could potentially overcome the disadvantages of SPR biosensors. The ISAM technique is a type of layer-by-layer …
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MULTIPHASE MICROFLUIDIC FABRICATION OF POLYMERIC MICRO-CONTAINERS FOR BIO-ENCAPSULATION
… containing biomolecules using Reverse phase layer-by-layer deposition. The model protein system of BSA was encapsulated with two layers of polyelectrolytes using novel geometry in the preliminary experiments. The final chapter consists of conclusion and future works.
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The formation and characterisation of micro- and nanostructured surfaces through combinations of top-down and bottom-up fabrication methodologies
… patterning of monomolecular self-assembled-monolayers (instead of conventional polymeric resists) with electron beam lithography to form chemical patterns on gold surfaces. The chemical patterns on the surface then direct the self-assembly of gold nanoparticles with complementary chemistry. …
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Nanoscale and microscale approaches for engineering the in vitro cellular microenvironment
… colony size, cells and proteins were patterned by using molding or printing methods. Poly(ethylene glycol)-based molecules and polysaccharides were used to control cell-substrate interactions and to prevent cell adhesion on specific regions of a substrate. To control cell-cell contact, …
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Ultra-high-aspect-ratio nanofluidic channels for high-throughput biological applications
… nanochannels have been developed by using a combination of anisotropic wet etching and thermal oxidation. Vertical nanochannels with a uniform gap size of 55 nm and aspect ratio as high as 400 have been demonstrated. In addition, we have implemented high-aspect-ratio nanochannels …
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Exploring the versatility of lead sulfide quantum dots in low-temperature, solution-processed solar cells
… voltage and hole extraction into the PbS QD layer. In ZnO/PbS QD heterojunction solar cells, the feasibility of preparing fully inorganic, halometallate-passivated PbS QD inks for use as the absorber layer is discussed. A modified biphasic ligand exchange strategy is presented and in order to …
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Enhancing the printability of food inks and the structural stability of 3D-printed food through additive food manufacturing
… manufacturing (AM) technology that enables the layer-by-layer deposition of food materials to achieve target objects, offering numerous advantages such as customization, personalization, design flexibility, and cost-effectiveness. 3D food printing offers personalized food for individuals with …
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Development of a non-living model system for cell membranes and investigation of its mechanical and tribological properties
… Grafting of lipid with PAAm was achieved through layer by layer deposition of alternating poly(allylamine hydrochloride) (PAH)and poly(sodium 4-styrenesulfonate) (PSS) polyelectrolyte multilayers (PEM). Single step bilayer formation was observed under QCM on the PAAm-PEM support owing to high …
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Development of Solution-Processed Stable Silver Nanowire Networks for Transparent Electrodes
… seeks to overcome the failure modes of AgNWs by developing fully solution-based fabrication processes for nanocomposite transparent electrodes incorporating AgNWs and Graphene Oxide (GO) or Reduced Graphene Oxide (RGO). In particular, electrophoretic deposition and layer-by-layer deposition …
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Polyelectrolyte multilayers (PEM) in micro / nanofluidics for novel BioMEMS platforms
… the versatility of the polyelectrolyte multilayer (PEM) to fabricate a novel micro/nanofluidic device for patterning bacteria in BioMEMS. Nanofluidic channels offer new opportunities for advanced biomolecule manipulation and separation science because they provide unique capabilities such as …
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The effect of interfacial compositions on the dispersed phase-induced gelation and controlled digestion of mono and bilayer nanoemulsions
… (oil volume fraction, φ = 0.2 to 0.4)-stabilized by food-grade emulsifiers and polysaccharides. Importance was given to addressing the increase in effective volume fraction (φeff) of oil droplets beyond maximum random jamming (φMRJ) by reducing droplet size, removing excess emulsifier and changing …
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Deposition, crystallization and nanoindentation of substrate-bound biomolecule-assembled nanomaterials
… - DNA-NP superlattices - is studied here by first examining methods to create thin films of DNA-NPs that can be accurately probed using nanoscale mechanical testing techniques, then using AFM nanoindentation of various superlattice designs to correlate DNA-NP lattice structure to …
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Development and characterization of conducting polymer actuators
… carbon nanotubes into conducting polymers using layer by layer deposition and drop casting methods have been explored. These new composite materials and techniques significantly reduce creep, improve conductivity and increase stiffness of the polymer actuators.
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Nanoparticle-based Organic Energy Storage with Harvesting Systems
… The semiconducting polymer is obtained by blending poly (vinyl alcohol) and poly (acrylic acid) in crystal state polymers with a known plasticizer; glycerol or sorbitol. Synthesized nanoparticles namely, zinc-oxide (ZnO), erbium (Er), cadmium sulfide (CdS), palladium (Pd) and …
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Static and ultrafast optical properties of nanolayered composites : gold nanoparticles embedded in polyelectrolytes
… thesis gold nanoparticle/polyelectrolyte multilayer structures were prepared, characterized, and investigated according to their static and ultrafast optical properties. Using the dip-coating or spin-coating layer-by-layer deposition method, gold-nanoparticle layers were embedded in a …
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Polyelectrolyte multilayers for plasmonics and picosecond ultrasonics
… the application of polyelectrolyte multilayers in plasmonics and picosecond acoustics. The observed samples were fabricated by the spin-assisted layer-by-layer deposition technique that allowed a precise tuning of layer thickness in the range of few nanometers. The first field of interest …
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Sensitivity control of optical fiber biosensors utilizing turnaround point long period gratings with self-assembled polymer coatings
… aims to show that Ionic Self-Assembled Multilayers (ISAMs) adsorbed on Long Period Gratings (LPGs) can serve as a highly sensitive, robust, inexpensive optical-based biosensor platform. The ISAM technique is a layer-by-layer deposition method that builds nanometer-thick films based on the …
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