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 16 of 16 for “"gold nanospheres"”.
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Deciphering optical properties of hollow gold nanospheres
Hollow gold nanospheres (HGNs) demonstrate a tunable localised surface plasmon resonance ranged from the visible to near infrared (NIR) which is of significant importance for bioimaging due to the better penetration depth and reduced autofluorescence. They consist of high quality nanoshells with a …
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Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly
… the plasmonically directed self-assembly of gold nanospheres onto both silver nanospheroids and gold nanorods. At the heart of this research is a the use of a photocleavable ligand (1-(6-Nitrobenzo[d][1,3]dioxol-5-yl)ethyl(4-(1,2-Dithiolan-3-yl)butyl) carbamate), which is capable of forming a …
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Preparation and Characterization of Carbohydrate-Functionalized Nanomaterials for Use as Cellular Probes and Targeted Delivery Vehicles
… glycoconjugates to functionalize the surface of gold, silica, nanoparticles, and surfactant vesicles, and (2) the preparation and characterization of carbohydrate-functionalized gold nanospheres and surfactant vesicles. A variety of N-linked glycoconjugates tethered to thiols, siloxanes, and …
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Hard and soft coatings on gold nanoparticles at the nano-bio interface
This dissertation explores surface chemistry of gold nanoparticles, with a special focus in developing analytical methods to decipher the environment of small molecule ligands and biomolecule coronas at the molecular level. Chapter 1 introduces the physical and chemical properties of gold …
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Synthesis and characterization of metallic nanoparticles with photoactivated surface chemistries
… of nanoparticles. We focused on elongated shaped gold nanorod due to its unique surface plasmon resonance and probable biomedical applications. In this research we formed a dumbbell shape assembly of nanoparticles in suspension. A probable application for these assemblies can be in vivo imaging. …
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Nanoparticle effects on cell migration
It has been found that gold nanoparticles (Au NPs) are excellent materials for biological applications such as diagnosis and drug delivery, which makes it crucial to understand the interface between gold nanoparticles and cells. Previous work has shown that gold nanoparticles can affect cellular …
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Surface plasmon resonance study of the purple gold (AuAl₂) intermetallic, pH-responsive fluorescence gold nanoparticles, and gold nanosphere assembly
… compound AuAl₂, also known as purple gold, originates from surface plasmons (SPs). This contrasts to a previous assumption that this color is due to an interband absorption transition. The existence of SPs was demonstrated by launching them in thin AuAl2 films in the Kretschmann …
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Engineering Application-Specific Plasmonic Nanoparticles: Quantitative Measurements and Precise Characterization
… comparing experiments with analytical theory for gold nanospheres is proposed and utilized. Results show that elongated particles scatter very brightly for their volumes. This brightness is due to a strong longitudinal plasmon resonance that occurs in the near infrared – where gold has minimal …
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Ultrafast and Nonlinear Spectroscopy of Colloidal Nanomaterials
… the growth of a silver shell on the surface of gold nanoparticles in real time. Additionally, gold-silver-gold core-shell-shell nanoparticles possess extinction peak wavelengths that can be controlled over the visible and near-infrared regions and enhanced photothermal effect. Transient …
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Optical Sensors for High-Temperature Pressure Measurement and Real-Time Particle Detection
… loss, we first consider a model where Au nanospheres are self-assembled on taper surface through electrostatic interaction. An analytical model is established to describe the adsorption of gold nanospheres onto cylindrical and spherical silica surfaces from quiescent aqueous particle …
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Effective dose enhancement using gold as a radiation sensitizer: a Monte Carlo study
… the promising results achieved by utilizing gold nanospheres in murine models, interest in gold has correspondingly increased. This work examines several variables as they might pertain to the effectiveness of using gold as a radiation-sensitizing agent. Physical considerations involving the …
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Properties modification of nanopatterned surfaces functionalized with photo activated ligands
… enhanced Raman spectroscopy of functionalized gold nanoparticles, and two photon uncaging in gel. Those techniques are used for development of novel nanofabrication methods for top-down and bottom-up assembly of nanostructures, by modifying the properties of nanopatterned surfaces with …
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Excitation, Interaction, and Scattering of Localized and Propagating Surface Polaritons
… near-field-interacting dimers or trimers of gold nanospheres. The hot spots found under such conditions increase the sensitivity of surface-enhanced Raman scattering by several orders of magnitude and simultaneously reduce the probed volume, thereby providing single-molecule sensitivity. The …
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Investigating the impact of gold nanoparticles on pulmonary cells: From 2D to 3D culture systems
… properties on the nanoscale. Interest in using gold nanoparticles in biological applications is growing ranging from sensing to cancer therapy due to their tunable sizes and shapes, unique optoelectronic properties, and straightforward surface modification. The advancement of fine-tuning of gold …
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Experiments on the Thermal, Electrical, and Plasmonic Properties of Nanostructured Materials
… photolithographic technique. In this method, gold nanosphere conjugation were conjugated to a photocleaved ligand, however conjugation could be inhibited by exposing the cleaved ligand to 532 nm light and consequently yield a reversal technique. This defunctionalizion effect did not occur on …
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Chemistry and Measurement at Aqueous Nanoscale Interfaces
… of protein corona formation on charged gold nanoparticles with an emphasis on the effect that the deformability of the protein has on the corona formed. The second describes the synthesis of polyamide membrane active layers using a support-free approach and examines the effect of monomer …