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 47 for “"CdSe/ZnS"”.
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Integration of CdSe/ZnS Quantum Dots into As-induced Etched Nanovoids on GaSb
… into the infra-red. The colloidal synthesis of CdSe/ZnS quantum dots is presented, to describe their incorporation into nanovoids formed on GaSb membranes. Nanoscale etch-pit formation on GaSb surfaces happens as a result of arsenic (As2) based in situ etch technique. The effect of in situ etch …
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Power Dependent Study of CDSE-ZNS Quantum Dot Relaxation Dynamics by 2D Muppets
<p>CdSe-ZnS core-shell quantum dot relaxation dynamics are multiexponential and have a strong power dependence. Because single exciton and biexciton populations, are indistinguishable by any-dimensional experiments, there is uncertainty as to whether this power dependence comes from a biexciton or …
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Efficient light emitting devices utilizing CdSe(ZnS) quantum dots in organic host matrices
… from thin film structures containing core-shell CdSe(ZnS) quantum dots dispersed in molecular organic host materials. In the most efficient devices, excitons are created on the quantum dot sites via energy transfer from organic host molecules, and direct charge injection into the quantum dots is …
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Characterizing uptake, distribution and fate of CdSe/ZnS quantum dots in Synnechococcus elongatus PCC7942
… fate of both water insoluble and water soluble CdSe/ZnS quantum dots in cyanobacteria. To quantify the toxicological impact of quantum dots on cells, cell growth rate, membrane destabilization, viability and the activity of photosynthetic pigments were characterized. For characterization of …
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Synthesis and Characterization of CdSe/ZnS Core/Shell Quantum Dot Sensitized PCPDTBT-P3HT:PCBM Organic Photovoltaics
… we aim to increase absorption by adding CdSe(ZnS) core (shell) quantum dots. Four groups of devices are fabricated: a control group with an active polymer layer of 16 mg/mL P3HT, 16 mg/mL PCBM, and 4 mg/mL PCPDTBT; and three groups with dispersed quantum dots at 4 mg/ml, 1 mg/mL, and 0.25 …
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Quantum dot - molecularly imprinted polymer nanomaterials for the fluorescence sensing of selected pharmaceutical and personal care products
… monitoring and sensing applications. Core/shell CdSe/ZnS QDs were synthesized through the one-pot organometallic approach in order to explore the fluorescence sensing of the QDs towards triclosan. A ligand exchange reaction was also performed with glutathione (GSH) as a surface capping agent to …
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Chalcogenide Sol-Gel Assembly: Controlling The Kinetics Of Nanocrystal Aggregation And Film Formation For Applications In Optoelectronics
… applications. </p> <p>Sol-gel assembly of CdSe/ZnS core/shell NCs typically results in opaque gel materials, which is one of the major obstacles for their use in optoelectronic applications such as LEDs. Macroscopic properties (i.e. transparency) of CdSe/ZnS gel structures were tuned by …
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Analyte sensing with luminescent quantum dots.
… discusses the synthesis and characterisation of CdSe and CdSe/ZnS QDs. Three different sized QDs were prepared each with distinct emission wavelengths. The sizes of these nanoparticles were determined by three methods, transmission electron microscopy (TEM), dynamic light scattering (DLS) and by …
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Quantum dot-based nanomaterials for biological imaging
… The larger diameter range was accessed by doping CdSe/ZnS or CdS/ZnS quantum dots (QDs) into shells grown on the surfaces of pre-formed sub-micron SiO2 microspheres. The smaller diameter range was accessed with two different materials: very small InAs/ZnSe QDs and CdSe/ZnS QDs, each water …
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Nanoparticles for Simultaneous Assessment of Ros and Radiosensitization of Brain Cancer Cells for Improved Radiotherapy Outcomes
… we used fluorescence intensity modulation of CdSe/ZnS quantum dots (QDs) to assess reactive oxygen species (ROS) generation during chemotherapy and radiotherapy for cancer cells, we are applying this assay for concurrent measurement of ROS and radiosensitization. Using a Faxitron Cell …
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Bezkontaktní měření teploty pomocí luminiscenčních materiálů
… byla změřena fotoluminiscence kvantových teček CdSe/ZnS a GaAs pro různé teploty a ze získaných hodnot byla určena relativní změna parametrů luminiscence jako poloha emisního píku, intenzita, poměr intenzit dvou píků a doba života luminiscence v souladu s očekáváním dle literatury. Dosažení …
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Design and Development of Nanoconjugates for Nanotechnology
… Immobilizing luminescent semiconductor CdSe/ZnS QDs to a solid platform for QD-based biosensors offers advantages over traditional solution-based assays. In the first project, we designed highly sensitive CdSe/ZnS QD SET-based probes using gold nanoparticles (AuNPs) as FRET acceptors on …
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Development and Characterization of Phospholipid Encapsulated Quantum Dot Constructs for Biologic Applications
… QD constructs are cadmium-selenium/zinc-sulfide (CdSe/ZnS) quantum dots encapsulated within a bovine derived milk phospholipid micelle. QD constructs provide a potential mechanism for the identification of cancerous cells within a biopsy. Appreciating the scope of the clinical problem and …
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Silica Microspheres Functionalized with Self-assembled Nanomaterials
… resonances, and fluorescent materials such as CdSe/ZnS core/shell QDs. A major part of this thesis is to investigate the relationship between cavity Q factors and the amount of nanomaterials deposited onto the silica microspheres. In particular, we fabricate multiple functional microspheres …
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Opto-Electronic Modulation of Quantum Dots by Cells and Bioactive Molecules
… controlled changes in cellular activities. Using CdSe/ZnS core/shell QDs, spectroscopic analysis of optically excited colloidal QDs with HL60, K562, and T98G cell lines are performed. Our results show statistically significant (p < 0.001 and p < 0.0001) quenching of the emission spectra of the …
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The Preparation, Functionalization and Biomedical Applications of Carbonaceous Nanomaterials
… MWNTs and SWNHs could be conjugated with CdSe/ZnS quantum dots (QDs). TNT-EMFs were also encapsulated inside SWNHs to form SWNH peapods. SWNH peapods were functionalized by the modified HSVM method and then were conjugated with CdSe/ZnS QDs. The peapods were characterized by TEM. In vitro …
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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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Fabrication and characterization of quantum-confined optoelectronic devices based on CdSe nanocrystals
… synthetic methods to produce cadmium selenide (CdSe) QDs with very controlled size-distributions and high crystalline quality, their potential applications in a variety of fields are being extensively explored. In this thesis, I present a simple chemical approach to greatly enhance not only the …
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Semiconductor nanocrystal composite materials and devices
… luminescent materials. Chemically synthesized ZnS overcoated CdSe, (CdSe)ZnS, QDs are incorporated into a polymer host material. The main challenge in the preparation of QD-polymer composites is the prevention of both phase separation and aggregation of the QDs within the polymer host material, …
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