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 23 for “"Nanocubes"”.
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Exciton Dynamics and Optical Properties of Lead Halide Perovskite Nanocrystals: From Nanorods to Nanocubes
Lead halide perovskites, particularly CsPbBr3, have emerged as leading light emitters for their spectral purity, brightness, and facile synthesis. Their soft, ionic lattice makes them unusually defect tolerant but introduces problems with stability. Additionally, dephasing mechanisms and coupling …
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Silica modified Co3O4 nanocubes as a model system for metal-support interaction in Co/SiO2 catalyst for Fischer-Tropsch synthesis
… and cobalt crystallites using a model of Co3O4-nanocubes whose surface was modified with tetraethyl orthosilicate. The model systems were prepared in two steps, viz. synthesis of the cobalt(III,II) oxide nanocubes via the sodium dodecylsulphate assisted oxidative precipitation and a surface …
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In situ study of Co₃O₄ morphology in the CO-PROX reaction
… H₂ rich atmospheres. Different morphologies of nanocubes, nanosheets and nanobelts were prepared using hydrothermal mn and precipitation. Conventional spherical nanoparticles from our group were included to compare the activity of conventional nanoparticles with nanoparticles of different …
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Magnetism and interactions at the nanoscale: synthesis, characterization and applications
… iron cobalt (Fe65Co35) structures in the form of nanocubes and nanochains. The research employs advanced techniques such as Quantum Design DynaCool Physical Property Measurement System (PPMS), vibrating sample magnetometer (VSM), and magnetic force microscopy (MFM) to provide insights into …
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METAL OXIDE-BASED NANOMATERIALS FOR LITHIUM-OXYGEN BATTERIES APPLICATION
… ORR/OER. IN THIS STUDY, POROUS PEROVSKITE LANIO3 NANOCUBES, SPINEL-TYPE POROUS CO?MN?O NANOCUBES, HIERARCHICAL POROUS D-MNO2 NANOBOXES AND POROUS CO3O4 NANOBOXES HAVE BEEN DEVELOPED AND EMPLOYED AS THE CATHODE CATALYSTS FOR LI-O2 BATTERIES. THE SYNERGISTIC EFFECTS OF LARGE SPECIFIC SURFACE AREA, …
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Design and Synthesis of Metal Nanostructures for Plasmon-Enhanced Catalysis
… polyol methods to synthesize monodispersed Rh nanocubes with tunable size and resonant energy. The wide size tunability of slow-injection methods allows for the red-shift of resonant wavelength of small Rh nanostructures, which are in the deep ultraviolet (UV) region, to more accessible and …
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Semiconductor nanostructures for device applications
… (4-NP) chemical sensor based on CuO nanocubes. The structural characterizations confirmed the nanocrystalline nature and monoclinic structure for as-synthesized nanocubes. The optical property of CuO nanocubes exhibits indirect and direct band gap values examined by UV-Vis. …
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Engineering Noble-Metal Nanoparticles for Sensing and Imaging with Surface-Enhanced Raman Scattering
… composition on SERS are determined using Ag nanocubes, Ag nanospheres, and Au-based nanocages. I also demonstrate several techniques used to study the SERS of single nanoparticles, one at a time, which has provided significant insight into the SERS effect. I then discuss the development of a …
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Acoustic mode quantization in nanostructures
… 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 eigenfrequencies of these modes have been calculated and they agree well with the …
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Utilizing Hybrid Plasmon Modes to Probe Nanoparticle-Polymer Interfaces
… on the thermally induced embedding of silver nanocubes (AgNCs) into polymer surfaces. The AgNCs were deposited onto polymer films, through a Langmuir approach, which allows fine control over nanoparticle density in the monolayer. The AgNC monolayer was then heated above the glass transition …
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modeling and application of nonlinear metasurface
… by integrating spiropyrans with film-coupled nanocubes. This metasurface platform couples almost 100% energy at resonance, and induces isomerization of spiropyrans to merocyanines. Due to the large Purcell enhancement introduced by the film-coupled nanocubes, fluorescence lifetime measurements …
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Plasmonic nanostructures and metamaterials for nanoscale light-matter interaction
… spacing and relative orientation of the nanocubes in the nanocube chains has also been analyzed. The band-edge lattice plasmon waves in plasmonic nanoantenna arrays have been studied and utilized for surface-enhanced Raman spectroscopy. Superchiral spectroscopy at the molecular level is …
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Self-assembly of bioactive or electrocatalytic polyaspartamide nanoparticles
… micelles via surface coating with platinum nanocubes (Chapter 4). Overall, the results of this thesis study would greatly serve to allow us to engineer the function of nanocarriers in a simple and economic manner, and expedite their uses in a wide array of applications.
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Understanding the Toxicity Effects of Nanostructures: I. Effect of Physico-chemical Properties on Environmentally Relevant Organismal Toxicity. II. Design of Novel Nanostructures to Reduce Environmental Toxicity while Retaining Functional Properties
… shapes (i.e. silver nanoparticles, silver nanocubes, and silver nanowires) was examined in environmentally relevant and model organisms including Lolium multiflorum, Danio rerio, Caenorhabditis elegans, and the bacterial strains Escherichia coli, Pseudomonas aeruginosa, and Bacillus cereus …
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Lasing From Single Film-Coupled Nanoparticles
… optical pump intensity from single film-coupled nanocubes with a variety of embedded dyes corresponding favorable geometric and material parameters. Agreement between analytically predicted thresholds and experimentally measured thresholds validates the previously developed theory and …
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Engineering the Optical Properties of Gold Nanostructures for Biomedical Applications
… the galvanic replacement reaction between Ag nanocubes and AuCl<sub>4</sub>-. I have engineered these Au nanocages to have localized surface plasmon resonance: LSPR) peaks in the near-infrared region with strong absorption. These optical properties allow for the imaging of biological tissues …
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Effects of metal ion–ligand interactions on the synthesis of metal nanostructures with controlled morphology
… Two-dimensional multilayered Pd nanosheets, Pt nanocubes, and Pd nanoplates with controlled morphology were synthesized. The adsorption of metal intermediates and ligands on Pd surfaces was studied using density-functional theory (DFT) calculations. The effects of metal ion–ligand interactions …
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Development of Strontium Titanate Based Nanomaterials for Resistive Switching Applications
… method is introduced to prepare SrTiO3 nanocubes and thin films. Using silver top electrode deposited by ink-jet printing, the device shows a typical bipolar switching behaviour. After deposition of silver nanowires onto the bottom electrode, unipolar switching with a high on/off ratio …
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Controlled Synthesis and Characterization of Magnetic Chalcospinels Nanocrystals
… is not stable in bulk form. The host p-CuSe2 nanocubes did also undergo a degradation influenced by the reaction temperature and the doping of Cr3+ ions in the pyrite crystal structure. The Cr-doped nanocrystals of the pyrite phase were formed during the heat-up procedure and by increasing the …
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Design and Synthesis of Nanomaterials for Surface-Enhanced Raman Scattering, Fuel Cell Technology, and Photonics
… with well-defined shapes including octahedra, nanocubes, and nanorods. The resultant hollow Pd-Pt bimetallic nanostructures were employed as electrocatalysts for the oxygen reduction reaction: ORR). Our results demonstrated that the nanostructures derived from Pd octahedra displayed the highest …
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