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 418 for “"nanocrystals"”.
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Anisotropic Heterostructures of Nanocrystals
Based on what we have learned from Fe3O4/MS model system, we have considered application in technologically important systems such as heterostructures that exhibit visible light photocatalysis. Using the combination of NC heterostructures of materials with type II band offset and multiple exciton …
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Turning InP nanocrystals up to 11: Coinage Metal Cation Exchange in InP Nanocrystals
… accessed, including doped nanoparticles, alloyed nanocrystals, and even fully exchanged nanomaterials that may be challenging or impossible to create via traditional synthetic methods. This thesis focuses on the cation exchange of coinage metal (Cu, Ag, Au) cations in InP nanomaterials. Chapter 1 …
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Fluorescent silicon nanocrystals for bioimaging
… for in vitro and in vivo bioimaging. Here, Si nanocrystals are studied for imaging applications. The stability of Si nanocrystal dispersibility and photoluminescence (PL) in aqueous solutions was studied. Hydrophobic Si nanocrystals were dispersed with surfactants to produce colloidally stable …
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Hybrid optoelectronics with colloidal nanocrystals
… in colloidal spherical cadmium sulfide CdS nanocrystals (NC) in the vicinity of a single indium gallium nitride InGaN quantum well (QW) in dependence of temperature. QWs of the alloy material InGaN exhibit a dependence of the exciton dimensionality on the thermal energy available. It was …
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Gel Development Using Cellulose Nanocrystals
Cellulose Nano Crystal (CNC) are naturally derived nanoparticles with a slender shape that own a remarkably high aspect ratio. Due to its mechanical properties with Young modulus in the range of 120-160 GPa and proven biocompatibility, CNC is an attractive nanoparticle for many applications. In the …
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Carrier Dynamics in Perovskite Nanocrystals
… we describe our work discovering perovskite nanocrystals with desirable optoelectronic properties for high-efficiency solar cells. Ultrafast carrier-phonon interactions in semiconductors represent a major loss of the excess energy of photoexcitations above the bandgap. We demonstrate …
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Semiconductor nanocrystals for novel optical applications
… composites photosensitized with semiconductor nanocrystals have emerged as an important class of materials. Here, we report on the photosensitization of photorefractive polymeric composites at visible wavelengths through the inclusion of narrow band-gap semiconductor nanocrystals composed of …
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Clarithromycin nanocrystals for high-dose inhalation
… soluble clarithromycin (BCS II) was converted to nanocrystals by wet media milling. Spray-dried hollow microparticles, so called "Trojan particles", in which nanocrystals are incorporated in a matrix shell are designed for deep-lung deposition while retaining good flow and dispersion. …
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Synthesis and characterization of cobalt nanocrystals
… magnetic properties is also addressed. Cobalt nanocrystals are prepared by thermal decomposition of dicobalt octacarbonyl in solution and in the presence of suitable surfactants and coordinating ligands, which influence the shape of the resulting crystals as well as their internal structure. …
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Optoelectronic properties of size-selected silicon nanocrystals
Thin films of silicon nanocrystals (Si-nc) were produced by laser pyrolysis of silan and accumulated on various substrates. Layer growth, optical properties, charge transport, photoluminescence (PL) and electroluminescence (EL) were investigated on these porous layers. A stick-ball model for layer …
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Electronic and optical properties of InAs nanocrystals
… and opti- cal properties of spherical InAs nanocrystals. Our calculated interband (valence-to- conduction) absorption spectra reproduce the features observed experimentally both qualitatively and quantitatively. The results relative to intraband (valence-to-valence and …
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Stabilizing Degenerate Dopants in Colloidal Semiconductor Nanocrystals
Semiconductor nanocrystals possessing excess delocalized charge carriers are garnering considerable attention for their applications in a wide range of emerging technologies. In order to realize their incorporation into practical devices, a detailed understanding of their electronic structural …
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Inducing Chirality in CdS Nanocrystals with Biomolecules
Chiral CdE (E=S, Se, Te) nanocrystals (NCs) are an emerging class of materials with potential applications in optoelectronics, bioimaging, and sensing. Among the strategies for generating chiral CdE NCs, which include 1) chiral molecule templated nucleation and growth, 2) assembly of CdE NCs into …
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Atomic Modelling of Disorder in Metal Nanocrystals
… applicable to other cases, like the clusters of nanocrystals observed in powders produced by high-energy ball milling, which is also a topic discussed in (ii). The work aims to show a general approach to atomistic modelling, both for isolated nanoparticles with definite shapes, and grains of …
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Surface functionalisation techniques for colloidal inorganic nanocrystals
Colloidally-stable inorganic nanocrystals have a wide range of envisaged applications in biological environments. To reach their potential, the nanocrystals need to be stable in aqueous environments and have pendant functionality available for attachment of biomolecules. In this thesis, new methods …
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Heterostructures Prepared by Surface Modification of Nanocrystals
Inorganic nanocrystals (NCs) have drawn the attention from many researchers due to their promising potentials for next generation technologies, from photovoltaics to biological applications. Various types of NCs have become available by synthetic protocols developed in the last two decades. In …
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Structural and plasmonic properties of gold nanocrystals
The design of gold nanoparticles for surface-enhanced Raman scattering (SERS) and plasmonic enhanced fluorescence are more involved than simply maximizing the local field enhancement. The enhancement is a function of the excitation wavelength relative to the plasmon resonance as well as the …
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Exploring condensed phases in engineered semiconducting nanocrystals
… called cation exchange to produce semiconductor nanocrystals (NCs) in novel morphologies, compositions, and crystallographic phases. My dissertation research focuses on the understanding of the physical properties and phase transitions of these new nanomaterials prepared by cation exchange. In …
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