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 21 for “"Nanosphere Lithography"”.
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A study toward large-area low-defect nanosphere lithography
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Characterizing Engineered Nanomaterials: From Environmental, Health and Safety Research to the Development of Shaped Nanosphere Lithography for Metamaterials
… those described as metamaterials. A new shaped nanosphere lithography approach was used to manipulate the form of silica nanospheres packed onto a surface; the resulting array of mushroom structures provided a mask that after gold evaporation and etching left either golden rings or crescents …
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Nanolithographically defined semiconductor quantum dots
… grown quantum wells (QWs) using a top-down nanosphere lithography, dry-etch and overgrowth fabrication process. Devices are characterized by a current density-voltage (JV) test, electroluminescence (EL) and photoluminescence (PL) spectroscopy. The quantum confi nement is simulated by COMSOL.
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Self-organization on Nanoparticle Surfaces for Plasmonic and Nonlinear Optical Applications
… I combined silver nanoparticles fabricated by nanosphere lithography with ionic self-assembled multilayer (ISAM) films, tuning the geometry of the particles to make their plasmonic resonances overlap with the frequency of optical excitation. The designed hybrid metallic/organic nanostructures …
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Metal-assisted chemical etching of 4H silicon carbide
… wet etching is demonstrated on 4H-SiC. Both photolithography and nanosphere lithography are used to pattern the substrate, being compared in etch quality and characteristics. Control of porosity and etch rate are presented, with a mechanism analysis provided to complement the explanations in the …
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Nanolaminate coatings to improve long-term stability of plasmonic structures in physiological environments
… used in sensing, super-resolution imaging, SPP lithography, SPP assisted absorption, SPP-based antennas, light manipulation, etc. To take full advantage of the attractive capabilities of CMOS compatible low-cost plasmonic structures based on Al and Cu, nanolaminate coatings are investigated to …
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Synthesis and Characterization of Nanostructures in Porous Anodic Aluminum Oxide Templates
… in the templates by electrodeposition. By using lithography techniques, controlled patterned nanostructures were also fabricated on alumina templates. The magnetic properties of the various metal nanostructures were investigated. The pore size, interpore distance, and pore geometry highly affect …
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Nanotexturisation of gold surfaces and its application to neural implants
… tools. A process has been created that uses Nanosphere Lithography for masking layer deposition and anisotropic etching to fabricate nanostructures on the surface of the electrodes. Optimisation of the process parameters led to a control of structure shape, which allowed to produce a variety …
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Unlocking single molecule detection sensitivities in surface-enhanced Raman spectroscopy
… fabrication techniques like electron-beam lithography that offer very high resolution, but suffer from low throughput. This thesis proposes a novel solution that combines parallel fabrication techniques of nanosphere lithography and Langmuir- Blodgett assembly with the ability to tune …
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Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy
… complicated by nanoparticle aggregation. Herein, nanosphere lithography (NSL) was used to fabricate uniform arrays of AgNPs immobilized on glass substrates. Nanoparticle immobilization enabled controlled evaluation of AgNP dissolution in an air-saturated phosphate buffer (pH 7, 25 °C) under …
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Controlled Evaluation of Metal-Based Nanomaterial Transformations
… study, arrays of immobilized MNPs fabricated by nanosphere lithography (NSL) were used to investigate environmental transformations of MNPs. Specifically, sulfidation of silver nanoparticles (Ag NPs) and dissolution of copper-based nanoparticles (Cu NPs) were investigated. Atomic force microscopy …
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Controlled Evaluation of Silver Nanoparticle Dissolution: Surface Coating, Size and Temperature Effects
… arrays were produced on glass substrates using nanosphere lithography (NSL). Changes in the size and shape of the prepared AgNP arrays were monitored during the dissolution process by atomic force microscopy (AFM). The dissolution of AgNP is affected by both internal and external factors. First, …
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A nanostructured porous silicon based drug delivery device
… hexagonally arranged holes produced by a novel nanosphere lithography (NSL) technique. A quasi-ordered PAA template with pore diameters in the region of 50 nm was fabricated but was not suitable for the subsequent proposed RIE process. By using the NSL technique, quasi-ordered PPSi structures …
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ZnO Nanostructures: Low-Temperature Synthesis, Characterisation, Their Potential Application as Gene-Delivery Tools
… position of solution-processed ZnO nanowires. Nanosphere lithography technique (NSL) utilizes a catalyst-assisted pattern generated by employing colloidal self-assembled crystal of polystyrene spheres (PS) on the substrate surface to guide the hydrothermal growth of ZnO nanowires. Further, we …
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Nano- and micro- electrodes: applications in the biosensing field
… wide and 400-500 nm deep) prepared by means of nanosphere lithography. The small size of the probe employed in the study allowed resolving the features of the sample, showing the significant capability to do electrochemistry with submicrometer spatial resolution. The small size of these …
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Properties modification of nanopatterned surfaces functionalized with photo activated ligands
… the development of an improved method for nanosphere lithography, a variation of the convective self-assembly technique. The method exhibited high reproducibility and yielded high quality monolayer crystals by withdrawing a meniscus of liquid polystyrene spheres solution and subsequent …
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Scanning Probe Investigations of Magnetic Nanoparticles, Protein Binding and the Synthesis of Rare Earth Oxide Nanoparticles Using Nanoscale Lithography
… organic thin films were prepared using particle lithography combined with organosilane chemistry. Biological and inorganic nanomaterials can be patterned with tailorable periodicities, which can be controlled by selecting the diameter of mesospheres used as surface masks. The surface platforms of …
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Sensing Applications of Silver and Gold Nanoparticles
… also show the calculation results of LSPRs of Au nanosphere suspensions using Mie theory. The measured extinction spectra of Au nanosphere suspensions agree with the calculated results very well. Chapter 2 is a chapter describing the chemical synthesis of a variety of NPs, such as Ag prisms and …
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Semiconductor quantum dots for mid-IR light emission
… grown quan- tum wells (QWs) using a top-down nanosphere lithography (NSL), dry-etch, mass-transport, and overgrowth fabrication process. Optically active nano- pillars with diameters as small as 90 nm are fabricated, and narrow linewidth(18 meV) electroluminescence from a fabricated diode …
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