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 202 for “"CdSe"”.
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Performance collaborative, distributed systems engineering (CDSE) : lessons learned from CDSE enterprises
The United States aerospace and defense budgets are shrinking, resources are scarce and requirements are more demanding: aerospace and defense enterprises are expected to deliver a more capable product in less time and with fewer resources. To achieve this tough mission, the enterprises that …
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Electronic transport in CdSe quantum dot arrays
… transport measurements on large arrays of CdSe nanocrystals. In response to a step in the applied voltage, we observe a power-law decay of the current over five orders of magnitude in time and four orders of magnitude in current. Furthermore, we do not observe a steady-state dark current …
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Photophysics of cadmium selenide (CdSe) semiconductor nanocrystals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Band edge spectroscopy of CdSe quantum dots
… the band edge exciton fine structure of CdSe quantum dots (QDs). These QDs or nanocrystallites are the result of recent synthetic efforts in the Bawendi group to produce nearly monodisperse nanocrystalline materials. The QDs are roughly spherical in shape and range in size from 10 to 50 A …
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Stark spectroscopy of cadmium Selenide (CdSe) nanocrystallites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Organometallic Synthesis Kinetics of CdSe Quantum Dots
CdSe quantum dots produced by organometallic synthesis are useful as tunable emitters for photonic devices and as multi-colored protein markers for biomedical imaging, applications requiring bright and narrow emission. A diffusion-limited model helped monitor growth rates via photoluminescence and …
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Synthesis, Characterisation and Functionalisation of CdSe Quantum Dots
… thesis focuses on the synthesis of high-quality CdSe nanocrystals through a bench- top colloidal synthesis paying particular attention to the effects of varying the reaction temperature and reagent concentrations on the size and crystallinity of the QDs. Powder X-ray diffraction (PXRD) analysis …
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Studies of sputtered CdTe and CdSe solar cells
… solar cells, I fabricated andcharacterized CdSe solar cells, which is considered as an ideal candidate for the top cellwith its band gap of 1.7 eV.This dissertation is designed to show similarities and differences between CdTeand CdSe solar cells, side by side. After the introduction …
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Colloidal CdSe/CdS nanostructures : synthesis, optical characterization and applications
The focus of this thesis is the study of CdSe/CdS nanostructures, from their fundamental properties to their integration in practical devices. This material system has proven to be remarkably robust both as a platform for studying physics in confined semiconductors, as well as for enabling various …
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Detection and spectroscopy of single CdSe nanocrystallite quantum dots
… spectrally resolve the fluorescence from single CdSe nanocrystallites. Through these experiments, we uncover many new and unexpected physical phenomena such as ultra-narrow emission linewidths, fluorescence blinking on a timescale of seconds, and spectral shifting over a wide range of time and …
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Understanding and engineering the photophysics of single CdSe nanocrystals
… thesis focuses on uncovering the 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 …
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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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Eletrossíntese e caracterização de Quantum Dots de CdTe e CdSe
… eletroquímica para síntese de QDs de CdTe e CdSe estabilizados pelo ácido tioglicólico (TGA). A metodologia de síntese eletroquímica desenvolvida consiste na redução eletroquímica de alguns calcogênios (telúrio e selênio) em solução aquosa de NaOH 0,2 mol L-1 (pH = 13) e atmosfera inerte, …
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CdSe based nanowires for the photocatalytic production of hydrogen gas
… technique to synthesize multi-segmented CdSe based nanowires for use as a photocatalyst device for hydrogen production. CdSe, Ni, Au and Pt nanowires were successfully synthesized with dimensions ranging from 100 nm to 350 nm in diameter and up to 10 µm long. The CdSe stoichiometry was …
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Time resolved fluorescence of CdSe nanocrystals using single molecule spectroscopy
A wide variety of spectroscopic studies of CdSe nanocrystals (NCs) are presented in this thesis, all studying some aspect of the temporal evolution of NC fluorescence tinder different conditions. In particular the methods of single molecule spectroscopy are used in many experiments allowing the …
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Interband and intraband optical studies of CdSe colloidal nanocrystal films
… results for optical measurements on charged CdSe nanocrystals. The injection of electrons into quantum confined states is confirmed by monitoring changes in the visible and infrared absorption spectra. Interestingly, the response is observed only in the nanocrystals that have been chemically …
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The physics and chemistry of transport in CdSe quantum dot solids
… the photoconductivity and dark conductivity of CdSe QD films are enhanced following annealing at high temperatures. Chapter 3 illustrates that the purity of the QD capping reagent (tri-n-octylphosphine) and the methods used for film preparation can each affect the observed photocurrent by two to …
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Lattice vibrational spectra of several mixed crystals of Cds and CdSe.
Thesis: M.S., Massachusetts Institute of Technology, Department of Physics, 1967
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Investigation of the Synthesis and Optoelectronic Properties of Ultrasmall CdSe Quantum Dots
… of the electronic band structure of ultrasmall CdSe QDs. Below 2 nm in diameter, approximately 90% of the atoms in ultrasmall QDs are on the surface, making them highly disordered structures. When excited by UV light, CdSe QDs in the ultrasmall size regime emit white light, i.e. all colors of …
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