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 55 for “"Au nanoparticles"”.
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Performance assessment of Au SERS substrates prepared by deposition of Au nanoparticles on screen-printed SiO2 particle films
… method is proposed for the preparation of Au@SiO2 3D SERS-active substrates. The procedure involved the synthesis of SiO2 nanoparticles for the deposition of thin porous SiO2 films on silica slides using a screen-printing approach. Annealed SiO2 particle films were subsequently …
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Gold-containing bimetallicnanoparticles
… studies, syntheses and characterization of Cu-Au, Pd-Au, and Pt-Au bimetallic nanoparticles. The computational methodology is a combination of a genetic algorithm coupled with an empirical potential and density functional theory, which is used to study theoretically the geometrical structure, …
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Investigation of the Magnetic Properties of Non-Thiolated Au Nano-Structures Grown by Laser Ablation
Although it is known that gold (Au) is diamagnetic in bulk form, it has been reported that Au displays magnetic properties when reduced to the nano-scale. Researchers found magnetism in Au nanoparticles (NPs) in a size range from 2 to 10 nanometers. Moreover, the Au nanoparticles are usually coated …
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Pyridine Modified Gold Nanoparticles for Electrocatalytic Carbon Dioxide Reduction and Methanol Oxidation Reactions
… produces an enormous amount of carbon dioxide, causing a series of environmental problems such as glacial melting, food production reduction, and sea-level rise. Because it can potentially help address the global energy challenges and environmental issues from fossil fuels, CO2 harvesting, …
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Utilization of nanostructured surfaces for sensing applications and the use of nanoentities for the fabrication of new materials
… for the mass detection of citrate passivated Au nanoparticles and the results were compared to AFM and XPS studies of the same system but on planar substrates. Chapter 5 is concerned with the fabrication of a bioarray for the patterned immobilization of human spermatozoa cells. Such arrays …
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Polymer and metallodielectric based photonic crystals
… (MDPC) structures. The fabrication of MDPCs with Au nanoparticles attached to the PMMA spheres core–shell particles is described. Various alternative procedures for the fabrication of photonic crystals and MDPCs are described and preliminary results on the use of an Au-based MDPC for …
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Engineering Noble-Metal Nanoparticles for Sensing and Imaging with Surface-Enhanced Raman Scattering
… Raman scattering: SERS) from Ag and Au nanoparticles with an aim to better understand the SERS mechanism and to implement this technique for single-molecule detection and imaging. In addition, SERS was used as a sensitive probe to study molecules confined to a nanoparticle's surface. …
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INVESTIGATION OF CRYOGENIC SURFACE CHARGING DURING OFF-AXIS ELECTRON HOLOGRAPHY
… is repeated with a solution of functionalized Au nanoparticles roughly 30nm in diameter suspended in DI water as a model system for more complex fluids. The mean inner potential of Au nanoparticles is measured in two experiments with values of 22.3V and 22.9V and the uncertainty in both values …
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The interplay of structure and optical properties in individual semiconducting nanostructures
… affect overall nanostructure properties because the investigation of nanostructure assemblies convolves nanoscale fluctuations to produce an averaged result. The investigation of individual nanostructures is thus paramount to a comprehensive analysis of nanomaterials. This thesis focuses on …
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Influence of alloy metal nanoparticles on the fluorescence properties of a ruthenium complex
<p>Silver and gold alloy nanoparticles were synthesized using starch as the protective agent and glucose as the mild reducing agent. The absorbance spectra of Au/Ag alloy nanoparticles showed that the glucose system resulted in the formation of stable nanoparticles. The present study investigates …
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Catalytic conversion of biomass-derived molecules into mono- and dicarboxylic acids and esters
… esters, from biomass-derived molecules. Gold (Au) catalysts have been rarely investigated for the oxidation of glucose in the absence of a base. These conditions are critical, however, to enable the sequential one-pot combination of cellulose hydrolysis and glucose oxidation. The study provides …
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Self-Assembly of Plasmonic and/or Luminescent Nanostructures.
… useful for improved optical applications. Gold nanoparticles (Au NPs) exhibit important chemical, electronic and optical properties, due to their size, shape, and electronic structures. Au NPs containing no more than 30-40 atoms are only luminescent because they can be regarded as large …
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SYNTHESIS OF NANOCOMPOSITES BY LASER ABLATION
Immunoglobulin E (IgE)-conjugated gold nanoparticles were produced via in situ conjugation of gold nanoparticles with immunoglobulin E by laser ablation of Au in a liquid solution. The colloidal stability and the size distribution of the resulting bio-nanoconjugates were examined with UV-Visible …
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DEVELOPMENT OF NOVEL MICROCAPSULES AND CELLULOSE-BASED BIOSORBENTS FOR POLLUTANTS REMOVAL FROM WATER
ARSENIC CONTAMINATION IN DRINKING WATER CAN CAUSE DELETERIOUS HEALTH HAZARDS, SUCH AS CANCER AND SKIN DISEASES. GROWING USE OF NANOPARTICLES IN HOUSEHOLD PRODUCTS CAN ALSO CAUSE ENVIRONMENTAL POLLUTION, OWING TO THE IMPROPER HANDLING OF WASTES AND EFFLUENTS. HENCE THERE IS A NEED FOR COST-EFFECTIVE …
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Syntheses and transformations of multimetallic nanoparticles
Multimetallic nanoparticles have had increased interest in recent years. In this thesis, we analyze Au, Ag, and Cu nanoparticles and multimetallic nanoparticles containing these three coinage metals. The incorporation of two or more metals together within nanoparticles allows for synergistic …
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Understanding and Controlling the Surface Chemistry of Oxides to Enhance Catalytic Activity at Elevated Temperatures
… segregation and resulting surface degradation causes a significant decrease in the activity of the air electrode. In the second study, a method to reverse this surface degradation and regenerate the surface catalytic activity with an applied electrical potential is introduced. The mechanism of …
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Fabrications and Applications of Protein-based Bionanocomposites
Stabilization of highly sensitive noble metal nanoparticles is essential for their practical application. Bionanocomposites in which various types of noble metal nanoparticles, especially anisotropic noble metal nanoparticles, are immobilized into a macroscopic biomaterial membrane show promising …
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Enhancement of the UV emission in metal nanoparticle-coated ZnO
… to the presence of a surface coating of either Au or Al nanoparticles. Two significantly different models have been proposed to explain the observed increase in the UV light output. One involving the decay of metal nanoparticles localised surface plasmons (LSP) into hot carriers and their …
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Towards stimuli-responsive functional nanocomposites: smart tunable plasmonic nanostructures Au-VO2
… stimuli to tune the local environment of gold nanoparticles embedded in VO2 host matrix would be ideal for the design of responsive functional nanocomposites. We prepared Au-VO2 nanocomposite thin films by the inverted cylindrical reactive magnetron sputtering (ICMS) known as hollow cathode …
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Electrocatalysts for the reduction of dioxygen and carbon dioxide
… support. Secondly, a new catalyst platform, Au nanoparticles supported on polymer-wrapped multi-walled carbon nanotubes (MWNTs), is applied for the electrochemical reduction of CO2 to CO. This catalyst exhibits a high selectivity for CO over H2 (80-92% CO at most cathode potentials), as well …
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