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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Wave Function Engineering In Cdse/Pbs Core/Shell Nanocrystal Heterostructures, Brian Matthew Wieliczka
Wave Function Engineering In Cdse/Pbs Core/Shell Nanocrystal Heterostructures, Brian Matthew Wieliczka
Arts & Sciences Electronic Theses and Dissertations
Colloidal semiconducting nanocrystals hold significant potential for third generation photovoltaics as solution processable materials that can surpass the Shockley-Queisser limit through multiexciton generation. In pursuit of this goal, the synthesis and optical characterization of CdSe/PbS core/shell quantum dots is reported. The spectroscopic behavior of these particles demonstrates their potential for use in optoelectronic devices, taking advantage of wave function engineering of the electron and hole. The rock salt PbS shell grows on all sides of the underlying zinc blende CdSe quantum dot, creating a core/shell structure. With increasing shell thickness, the band edge absorption and photoluminescence transitions decrease in energy …
Growth Of Indium Nitride Quantum Dots By Molecular Beam Epitaxy, Steven P. Minor
Growth Of Indium Nitride Quantum Dots By Molecular Beam Epitaxy, Steven P. Minor
Graduate Theses and Dissertations
Over the last decade, the evolution of the global consciousness in response to decreasing environmental conditions from global warming and pollution has led to an outcry for finding new alternative/clean methods for harvesting energy and determining ways to minimize energy consumption. III-nitride materials are of interest for optoelectronic and electronic device applications such as high efficiency solar cells, solid state lighting (LEDs), and blue laser (Blu-ray Technology) applications. The wide range of direct band gaps covered by its alloys (0.7eV-6.2eV) best illustrates the versatility of III-nitride materials. This wide range has enabled applications extending from the ultraviolet to the near …
Synthesis And Characterization Of Gd-Doped Inp/Zns Quantum Dots For Use In Multimodal Imaging Probes, Molly Erin Duszynski
Synthesis And Characterization Of Gd-Doped Inp/Zns Quantum Dots For Use In Multimodal Imaging Probes, Molly Erin Duszynski
MSU Graduate Theses
Quantum dots (QDs), which are intensely fluorescent nanocrystals ranging 2-10 nanometers in diameter, have shown promise in fluorescence imaging. However, in vivo applications of QDs are limited due to the opaque surrounding of tissue and bones. In this study, InP/ZnS QDs were doped with a paramagnetic atom in an attempt to render them MRI-active. We have further bioconjugated these nanoprobes to develop highly specific MRI-active probes that can be used for detection of neurodegenerative diseases. These bioconjugated nanoprobes detect a mutated form of alpha-synuclein that forms oligomers that are a hallmark of Parkinson’s disease andother alpha-synucleinopathies. Here, we have optimized …
Interactions Of (My) 6 (M = Zn, Cd; Y = O, S, Se) Quantum Dots With N-Bases, Mariusz Michalczyk, Wiktor Zierkiewicz, Steve Scheiner
Interactions Of (My) 6 (M = Zn, Cd; Y = O, S, Se) Quantum Dots With N-Bases, Mariusz Michalczyk, Wiktor Zierkiewicz, Steve Scheiner
Chemistry and Biochemistry Faculty Publications
(MY)6 clusters, with M = Zn and Cd and Y = O, S, Se, form double-layer drum-like structures containing M–Y covalent bonds. The positive regions near the M atoms attract the N atom of both NH3 and NMe3 so as to form a noncovalent M···N bond. This bond is quite strong, with interaction energies exceeding 35 kcal/mol. The bond strength diminishes with reduced electronegativity of the Y atom (O > S > Se) and is stronger for M = Zn than for Cd. Trimethylation of the base enhances the bond strength. The interaction is dominated by the electrostatic component …
Nanostructuring Organic/Inorganic Multicomponent Composites For Solution Processable Solar Cells, Brad Watson
Nanostructuring Organic/Inorganic Multicomponent Composites For Solution Processable Solar Cells, Brad Watson
Chemistry and Chemical Biology ETDs
The current state of organic photovoltaics is centered on systems of polymeric donors and some type of acceptor molecule (i.e. fullerene) formed into an active layer that adopts a bulk-heterojunction morphology. Although these devices have come a far way from where they were when they were first discovered in the 1980’s much work is still needed to make them a viable technology. Two of the limitations of this type of devices revolve around the relatively narrow absorption window of the components and lack of control over the morphology after the film is cast. To overcome these shortcomings there are several …
Novel "Turn Off-On" Sensors For Detection Of Dna-Acrylamide Interaction Using Zns Quantum Dots As A Phosphorescent Probe, Hayri̇ye Eda Şatana Kara
Novel "Turn Off-On" Sensors For Detection Of Dna-Acrylamide Interaction Using Zns Quantum Dots As A Phosphorescent Probe, Hayri̇ye Eda Şatana Kara
Turkish Journal of Chemistry
A novel "turn off-on" sensor for detection of interaction between DNA and acrylamide (ACR) was developed. In this method, L-cysteine capped Mn-doped ZnS quantum dots (QDs) were used as room temperature phosphorescent probes. In the ``turn-off'' mode, ACR was absorbed onto the surface of QDs via electrostatic interaction, which caused a quenching effect of room-temperature phosphorescence signal by photoinduced electron-transfer mechanism. ACR was removed from the QDs' surface with the addition of DNA. Thus, the phosphorescence emission of QDs was recovered and the system was turned to the ``turn-on'' mode. The quenching mechanism of QDs by ACR was collisional (dynamic) …