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 240 for “"QDs"”.
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Coating and Doping of Ge QDs
… into nanocrystals (NCs) and quantum dots (QDs) is one of the key technical challenges for the use of these materials in a number of optoelectronic applications, particularly solar applications. Unlike doping of traditional bulk semiconductors materials, the location of the doping element …
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Luminescent Semiconductor Quantum Dots (QDs) and Their Nanoassemblies as Bioprobes
Quantum dots (QDs) CdS and CdSe were synthesized in three different media including reverse micelles, aqueous solution, and trioctylphosphine oxide/trioctylphosphine (TOPO/TOP). Transmission electron microscope (TEM), X-ray diffraction (XRD), UV-VIS, fluorescence spectroscopy and microscopy were …
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Understanding electronic and optical properties of PbS QDs for improved photovoltaic performance
… owing to favorable optical properties of PbS QDs including facile tunability of bandgaps with the variation in dot sizes or shapes, wide spectral responses, and multiple exciton generation. To date, the efficiency advances of QD solar cells have been carried out almost exclusively through …
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Synthesis of Water Soluble Quantum Dots and their Application for Enzymatic Activity Measurements
Luminescenct Quantum Dots (QDs) intrigue the interest of researchers with their properties of high quantum yield, broad absorption and narrow emission spectra. Since prepared in organic solvents, QDs are not suitable for biological systems. In my study, several methods of "cap exchange" were …
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Understanding and engineering the photophysics of single CdSe nanocrystals
… photophysics of CdSe semiconductor quantum dots (QDs) at the single QD level, and correlating the phenomenological behavior observed at the single QD level to that observed at the ensemble level. Understanding the photophysics of QDs can potentially allow the specific optical properties of QDs to …
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Von Gold Plasmonen und Exzitonen : Synthese, Charakterisierung und Applikationen von Gold Nanopartikeln
… Durchmesser größer ~ 2 nm, Gold Quantenpunkte (QDs) mit einem Durchmesser kleiner ~ 2 nm sowie Gold Nanostäbchen (NRs) unterschiedlicher Länge hergestellt und optisch charakterisiert. Zudem wurden zwei neue Synthesevarianten für die Herstellung thermosensitiver Gold QDs entwickelt werden. …
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BIOSENSING OF MATRIX METALLOPROTEINASE ACTIVITY WITH CD-FREE QUANTUM DOTS
Quantum dots (QDs) have become attractive in the biomedical field on account of their superior optical properties and stability, in comparison to traditional fluorophores. QDs also have properties which make them ideal for complex in vivo conditions. However, toxicity has been a chief concern in …
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Quantum dot - molecularly imprinted polymer nanomaterials for the fluorescence sensing of selected pharmaceutical and personal care products
… applying cadmium based core/shell quantum dots (QDs) as fluorescence probes for the detection in aquatic compartments of triclosan (TCS) and acetaminophen (AC) which fall within the pharmaceutical and personal care products (PPCPs) subclass of emerging chemical pollutants (ECPs). Semiconductor …
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Synthesis and Characterization of Silica Coated CdSe/CdS Core/Shell Quantum Dots
… nanocrysallites, also known as quantum dots (QDs). Because of the strong quantum confinement, quantum dots have unique size-dependent optical properties, which are much more superior to the conventional organic fluorescence materials. In addition, strong chemical resistant makes inorganic …
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Theory of Tunneling-Injection Quantum Dot Lasers
… of electrons and holes into quantum dots (QDs) from two separate quantum wells (QWs). The potential of such a tunneling-injection QD laser for temperature-stable and high-power operation is studied under the realistic conditions of out-tunneling leakage of carriers from QDs (and hence …
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Development of Nanostructured Light Emitters in Gallium Nitride
… including quantum wells (QWs) and quantum dots (QDs), are of widespread importance as the key technology enabling high- brightness blue light-emitting diodes (LEDs) and lasers. GaN-based QDs also show promise as novel polarised single-photon sources that can operate at room temperature. This …
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Self-assembled strained nanostructures for light emission grown using molecular beam epitaxy
… The 0D nanostructures include quantum dots (QDs), dot in a well (DWELLs), sub-monolayer QDs and droplet epitaxy QDs, while 1D elongated structures include quantum dashes and nanowires (NWs). The optical properties of nanostructures can be controlled through size, composition, strain and …
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Synthesis and characterization of infrared quantum dots
… to create application ready quantum dots (QDs) in the infrared for biological imaging and optoelectronic devices. I concentrated primarily on controlling the size and size distribution of indium arsenide and cadmium arsenide QDs. In the nanocrystal community, classical nucleation and growth …
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Langmuir Blodgett films of colloidal silicon quantum dots for hot carrier photovoltaics
Colloidal quantum dots (QDs) materials have been found on a promising path to achieve practical low-cost and high-efficiency third generation solar cells. The solution processability of colloidal QDs enables low-cost fabrication of various kinds of colloidal QDs solar cells. Moreover, favourable …
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Charge Transfer Dynamics in Cadmium Chalcogenide Quantum Dots based Heterostructures
… in semiconductor nanocrystals or quantum dots (QDs) give rise to unusual electronic properties such as, size dependent bandgaps, high molar absorptivities and in some cases, hot carrier extraction and multi-exciton generation, which makes them suitable to harvest solar energy. Competition …
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CDSE Quantum Dots and Luminescent/Magnetic Particles for Biological Applications
CdSe semiconductor nanocrystals (quantum dots--QDs) with diameters ranging between 1.5 and 8 nm exhibit strong, tunable luminescence [1-5]. They have been widely investigated for their size-dependent optoelectronic properties [6], and for their potential use in optical devices [7], biological …
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Semiconductor nanocrystals : synthesis, mechanisms of formation, and applications in biology
… of semiconductor nanocrystals, or quantum dots (QDs). Novel synthetic routes to ternary 1-III-VI QDs are presented, and we report the first highly luminescent Cu-In-Se QDs spanning the red to near-infrared region. The synthetic method is modular and is extended to Ag-In-Se, Cu-In-Zn-S, and …
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Analyte sensing with luminescent quantum dots.
… nanocrystals otherwise known as Quantum Dots (QDs) have attracted considerable attention over the last number of years due to their unique optical properties and potential applications. Their narrow size-tunable emission spectra, broad absorption spectra, resistance to photobleaching and long …
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Opto-Electronic Modulation of Quantum Dots by Cells and Bioactive Molecules
Quantum dots (QDs) have applications and promising myriad applications in photovoltaic cells, biomedical imaging, targeted drug delivery, and quantum information processing. These have led to much research on their interactions with other systems. For biological systems, research has focused on the …
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Engineering semiconductor quantum dots for quantitative imaging of cell motility and invasion
Quantum dots (QDs) are photo-luminescent nanocrystals that possess unique optical properties such as a narrow emission range and high photo-stability, which makes them useful for a variety of biological imaging applications. In this study, QDs presenting different chemical moieties were used to …
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