Tesis sobre el tema "Semiconductor Nanoparticles/Quantum Dots"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores tesis para su investigación sobre el tema "Semiconductor Nanoparticles/Quantum Dots".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
Poppe, Jan. "Spectroelectrochemical Investigations of Semiconductor Nanoparticles". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-162122.
Texto completoMatas, Adams Alba Maria. "Semiconductor Nanoparticles as Platform for Bio-Applications and Energy Related Systems". Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/334391.
Texto completoEsta tesis esta dedicada a la sintesis, caracterizacion y aplicaciones de diferentes nanomateriales que presentan la propiedad de ser semiconductores. Esta dividida en tres bloques, en los cuales, en el primer de ellos se habla sobre quantum dots (QDs), que son nanoparticulas fluorescentes cuya longitud de onda de emision varia con el tamaño. Dichos materiales se estan usando ultimamente como sustitutos de los colorantes organicos ya que presentan ventajas, la principal es que no pierden su emision con el tiempo. Estos QDs han sido usados para estudiar su interaccion con el oro (que aumenta su intensidad de fluorescencia), han sido encapsulados usando polimeros para usarlos como controles en citometria de flujo y por silica para usarlos (una vez unidos a un peptido y un colorante organico adecuado) como detectores de fibrosis quistica. Finalmente tambien han sido usados en esta tesis para intentar seguir el movimiento de un receptor en plaquetas. En el segundo bloque de la tesis se habla de up conversion nanoparticles, cuya diferencia frente a los QDs es que se excitan a mayor longitud de onda a la que emiten, por lo que son capaces de absorber en el infrarojo y emitir en el visible, haciendolos ideales para aplicaciones en biologia. En esta tesis se usaron para reconocer un receptor en neutrofilos y para introducirlo dentro de hidrotalcitas (material que no es reconocido por el cuerpo como extraño) para asi poder liberarlo en el organismo. Finalmente, en el tercer bloque se han sintetizado materiales para catalisis (sulfuro de bismuto) y para celdas solares (oxido de titanio).
This thesis is dedicated to the synthesis, characterization and application of different nanomaterials that are semiconductors. It is divided in three blocks, in the first one we talk about quantum dots (QDs), that are fluorescent nanoparticles whose wavelength of emission changes with size. Such materials are being used as substitutes of organic dyes, due to the many advantages they present, the main one is that the fluorescence is not lost with time. These QDs have been used to study their interaction with gold ( that increases the fluorescence intensity), they have been encapsulated with polimers to be used as controls in flow cytometry or by silica to use them as sensors for cystic fibrosis (once they have been attatched to the right polymer and dye). Finally, in this thesis, they have been also used to track the movement of a platelet receptor. In the second block we talk about up conversion nanoparticles, which only difference regarding QDs is that they are excited using a longer wavelength than the emission, so they are able to absorb in the infrared and emit in the visible range of light, making them ideal for biological applications. We have use this materials to recognice an specific receptor in neutrophils as well as to be surrounded by hydrotalcite (body friendly material) so it can be released in the organism. Finally, in the third block we have syntesized materials for catalysis (bismuth sulfide) and for solar cells (titanium oxide for perovskite solar cells).
Dooley, Chad Johnathan. "New Nanomaterials for Photovoltaic Applications: A Study on the Chemistry and Photophysics of II-VI Semiconductor Nanostructures". Thesis, Boston College, 2009. http://hdl.handle.net/2345/705.
Texto completoThis dissertation examines the chemistry and photophysics of semiconductor quantum dots with the intent of studying their capabilities and limitations as they pertain to photovoltaic technologies. Specifically, experiments are presented detailing the first time-resolved measurements of electron transfer in electronically coupled quantum rods. Electron transfer from the conduction band of CdTe was measured to occur on the 400 fs timescale (kET = 2.5 x 1012 s-1), more than 500x faster than previously believed. Additionally, the direct optical promotion of an electron from the valence band of CdTe was observed, occurring on the timescale of the pump pulse (~50 fs). Based on the determined injection rates, a carrier separation efficiency of > 90% has been calculated suggesting these materials are sufficient for use in solar energy capture applications where efficient carrier separation is critical. To this end, model photovoltaic cells were fabricated, and their power conversion efficiency and photon-to-current generation efficiency characterized. In devices based of CdSe and heteromaterial quantum rods we observed fill-factors on the order of 10-20% though with power conversion efficiencies of < 0.02%. It was discovered that using a high temperature annealing step, while critical to get electrochemically stable photoelectrodes, was detrimental to quantum confinement effects and likely removed any hQR specific capabilities. Additionally, a detailed study on the role of nucleotide triphosphate chemistry in stabilizing emissive CdS nanoparticles is presented. Specifically it was observed that in a neutral pH environment, GTP selectively stabilizes CdS quantum dots with diameters of ~4 nm while the other naturally occurring ribonucleotides do not yield emissive product. The selectivity is dependent on the presence of the nucleophilic N-7 electrons near a triphosphate pocket for Cd2+ complexation as well as an exocyclic amine to stabilize the resulting product particles. However, in an elevated pH environment, the nucleobase specificity is relaxed and all NTPs yield photo-emissive quantum dots with PLQEs as high as 10%
Thesis (PhD) — Boston College, 2009
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Hellström, Staffan. "Exciton-plasmon interactions in metal-semiconductor nanostructures". Doctoral thesis, KTH, Teoretisk kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93306.
Texto completoQC 20120417
Jiang, Feng. "Ligand Controlled Growth of Aqueous II-VI Semiconductor Nanoparticles and Their Self-Assembly". Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311311.
Texto completoRazgoniaeva, Natalia Razgoniaeva. "Photochemical energy conversion in metal-semiconductor hybrid nanocrystals". Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1465822519.
Texto completoFairclough, Simon Michael. "Carrier dynamics within semiconductor nanocrystals". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:857f624d-d93d-498d-910b-73cce12c4e0b.
Texto completoSchill, Alexander Wilhem. "Interesting Electronic and Dynamic Properties of Quantum Dot Quantum Wells and other Semiconductor Nanocrystal Heterostructures". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11514.
Texto completoKairdolf, Brad A. "Development of polymer-coated nanoparticle imaging agents for diagnostic applications". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31845.
Texto completoCommittee Chair: Nie, Shuming; Committee Member: Bao, Gang; Committee Member: Murthy, Niren; Committee Member: Varma, Vijay; Committee Member: Wang, Zhong Lin. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Zedan, Abdallah. "GRAPHENE-BASED SEMICONDUCTOR AND METALLIC NANOSTRUCTURED MATERIALS". VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/457.
Texto completoDickerson, Bryan Douglas. "Organometallic Synthesis Kinetics of CdSe Quantum Dots". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27322.
Texto completoPh. D.
Lambright, Scott. "Ultrafast Charge Carrier Dynamics in Au/Semiconductor Nanoheterostructures". Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1404741549.
Texto completoKharin, Alexander. "Group IV nanoparticles for cell imaging and therapy". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1032/document.
Texto completoBiomedicine and biophotonics related businesses are currently growing at a breathtaking pace, thereby comprising one of the fastest growing sectors of innovative economy. This sector is truly interdisciplinary, including, very prominently, the development of novel nanomaterials, light sources, or novel device/equipment concepts to carry out photon conversion or interaction. The great importance of disease diagnosis at a very early stage and of the individual treatment of patients requires a carefully targeted therapy and the ability to induce cell death selectively in diseased cells. Despite the tremendous progress achieved by using quantum dots or organic molecules for bio-imaging and drug delivery, some problems still remain to be solved: increased selectivity for tumor accumulation, and enhancement of treatment efficiency. Other potential problems include cyto- and genotoxicity, slow clearance and low chemical stability. Significant expectations are now related to novel classes of inorganic materials, such as silicon-based or carbon-based nanoparticles, which could exhibit more stable and promising characteristics for both medical diagnostics and therapy. For this reason, new labeling and drug delivery agents for medical application is an important field of research with strongly-growing potential.The 5 types of group IV nanoparticles had been synthesized by various methods. First one is the porous silicon, produced by the electrochemical etching of bulk silicon wafer. That well-known technique gives the material with remarkably bright photoluminescence and the complicated porous structure. The porous silicon particles are the agglomerates of the small silicon crystallites with 3nm size. Second type is 20 nm crystalline silicon particles, produced by the laser ablation of the bulk silicon in water. Those particles have lack of PL under UV excitation, but they can luminesce under 2photon excitation conditions. 3rd type of the particles is the 8 nm nanodiamonds
Dubavik, Aliaksei. "Hydrophob/hydrophil schaltbare Nanoteilchen für die Biomarkierung". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-82718.
Texto completoGilstrap, Richard Allen Jr. "A colloidal nanoparticle form of indium tin oxide: system development and characterization". Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33995.
Texto completoOtto, Tobias. "Herstellung und Charakterisierung von Nanokristall-Lichtemitterdioden". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-78977.
Texto completoGrimes, Logan. "DEVELOPENT OF A PHOSPHOLIPID ENCAPSULATION PROCESS FOR QUANTUM DOTS TO BE USED IN BIOLOGIC APPLICATIONS". DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1237.
Texto completoHugall, James T. "On the nature of SERS from plasmonic nanostructures". Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/267496.
Texto completoKorkusinski, Marek. "Correlations in semiconductor quantum dots". Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29128.
Texto completoLarsson, Mats. "Spectroscopy of semiconductor quantum dots /". Linköping : Linköpings universitet, 2005. http://www.bibl.liu.se/liupubl/disp/disp2005/tek976s.pdf.
Texto completoChan, Ka Ho Adrian. "Quantum information processing with semiconductor quantum dots". Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648684.
Texto completoSiegert, Jörg. "Carrier dynamics in semiconductor quantum dots". Doctoral thesis, KTH, Mikroelektronik och tillämpad fysik, MAP, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4019.
Texto completoQC 20100920
Siegert, Jörg. "Carrier dynamics in semiconductor quantum dots /". Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4019.
Texto completoBylsma, Jason Michael. "Multidimensional Spectroscopy of Semiconductor Quantum Dots". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4001.
Texto completoChaney, Darren. "Relaxation processes in semiconductor quantum dots". Thesis, University of Leicester, 2004. http://hdl.handle.net/2381/4521.
Texto completoPuebla, Nunez Jorge Luis. "Spin phenomena in semiconductor quantum dots". Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4026/.
Texto completoKegel, Ingo. "X-ray diffraction from semiconductor quantum dots". Diss., [S.l.] : [s.n.], 2000. http://edoc.ub.uni-muenchen.de/archive/00000330.
Texto completoPlumhof, Johannes David. "Strain-tuning of single semiconductor quantum dots". Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-83517.
Texto completoBrocke, Thomas. "Electronic Raman spectroscopy on semiconductor quantum dots". Göttingen Cuvillier, 2007.
Buscar texto completoGraham, Timothy Carl Maxwell. "Spectroscopy of II-VI semiconductor quantum dots". Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/103.
Texto completoBarker, James Alexander. "The electronic properties of semiconductor quantum dots". Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/1021/.
Texto completoBarbour, Russell James. "A tunable microcavity for semiconductor quantum dots". Thesis, Heriot-Watt University, 2009. http://hdl.handle.net/10399/2298.
Texto completoCheng, Cheng. "Semiconductor colloidal quantum dots for photovoltaic applications". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:07baccd0-2098-4306-8a9a-49160ec6a15a.
Texto completoMalein, Ralph N. E. "Engineering coherent photons from semiconductor quantum dots". Thesis, Heriot-Watt University, 2015. http://hdl.handle.net/10399/3081.
Texto completoKonthasinghe, Kumarasiri. "Resonant Light Scattering from Semiconductor Quantum Dots". Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6527.
Texto completoSchmall, Nicholas Edward. "Fabrication of Binary Quantum Solids From Colloidal Semiconductor Quantum Dots". Bowling Green State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1245257669.
Texto completoHsieh, Chang-Yu. "Quantum Circuit Based on Electron Spins in Semiconductor Quantum Dots". Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20738.
Texto completoLiu, Tai-Min. "Electronic Interactions in Semiconductor Quantum Dots and Quantum Point Contacts". University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1311773375.
Texto completoPang, Hongliang y 庞鸿亮. "Quantum control of spins in semiconductor nanostructures". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208042.
Texto completopublished_or_final_version
Physics
Doctoral
Doctor of Philosophy
Boyer, de la Giroday Antoine. "Solid-state photonic interfaces using semiconductor quantum dots". Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/241720.
Texto completoKroner, Martin. "Resonant photon-exciton interaction in semiconductor quantum dots". Diss., München Verl. Dr. Hut, 2008. http://d-nb.info/989622762/04.
Texto completoSkiba-Szymanska, Joanna. "Electron nuclear spin interaction in semiconductor quantum dots". Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500176.
Texto completoRueda-Fonseca, Pamela. "Magnetic quantum dots in II-VI semiconductor nanowires". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENY015/document.
Texto completoIn this PhD work a novel type of magnetic semiconductor object has been developed: Cd(Mn)Te quantum dots embedded in ZnTe/ZnMgTe core-shell nanowires. The goal was to investigate the growth, by molecular beam epitaxy, and the fundamental properties of these complex heterostructures. For that purpose, two main issues were addressed: i) gaining control of the structural, electronic and magnetic properties of these quantum objects by mastering their growth; and ii) obtaining quantitative local knowledge on the chemical composition of those non-homogeneous nanostructures. To tackle these topics, our research was divided into four stages. The first stage was devoted to perform a quantitative study of the formation process of the Au particles that catalyze the growth of nanowires. The second stage involved the analysis of the mechanisms and parameters governing the growth of ZnTe nanowires. In particular, two different types of nanowires were found: cone-shaped nanowires with the zinc-blende crystal structure and cylinder-shaped nanowires with the hexagonal wurtzite structure. A diffusion-driven growth model is employed to fit some of the quantitative results presented in this part. The third stage focused on the insertion of pure CdTe quantum dots containing Mn ions in the core-shell nanowires. An initial study of the relevant parameters influencing the magneto-optical properties of these objects, such as the quantum dot confinement, the Mn incorporation, and the strain anisotropy, was performed. The four and last stage of this work concerned the quantitative interpretation of Energy-Dispersive X-ray spectroscopy measurements performed on single core-multishell nanowires. A geometrical model was proposed to retrieve the shape, the size and the local composition of the quantum dot insertions and of the multiple layers of the heterostructures. This study was coupled to other complementary characterization measurements on the same nanowire, such as cathodo-luminescence, micro-photo-luminescence and magneto-optical spectroscopy
Dakovski, Georgi L. "TIME-RESOLVED TERAHERTZ SPECTROSCOPY OF SEMICONDUCTOR QUANTUM DOTS". Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1192470456.
Texto completoChen, Pochung. "Quantum optical control of spins and excitons in semiconductor quantum dots /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3061632.
Texto completoFrenzel, Johannes. "Structural, electronic and optical properties of cadmium sulfide nanoparticles". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1170678349152-44850.
Texto completoFrenzel, Johannes. "Structural, electronic and optical properties of cadmium sulfide nanoparticles". Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A23935.
Texto completoSiegert, Jörg. "Semiconductor Quantum Dots Studied by Time-Resolved Luminescence Techniques". Licentiate thesis, KTH, Microelectronics and Information Technology, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1789.
Texto completoIn this thesis time-resolved photoluminescence spectroscopyis presented as a powerful tool to study the carrier dynamicsin various self-assembled quantum dot (QD) structures, whichare potentially attractive for device applications.
The experiments reveal the impact of proton irradiation onInGaAs QDs and comparable quantum wells. Nonradiativerecombination at defectsan important material parameterandmeasureof the structure optical qualityis found to play a much less important role for the QD samples.The superior radiation hardness can be explained as a result ofthe three-dimensional carrier confinement in QDs. Comparisonsbetween the structures show a decrease of photoluminescenceintensity for quantum wells but a slight increase for QDsirradiated at low to intermediate doses. This somewhatunexpected characteristic is described by an enhanced carriertransfer into the dots via the defects introduced in thematerial by the protons.
In a different structure carrier dynamics in spatiallyaligned of InAs QDs are investigated. Alignment along lines isachieved by misfit dislocations deliberately introduced in thesubstrate. Photoluminescence spectra of the dots exhibit muchsmaller inhomogeneous broadening than for the reference sampleas a result of an improved QD uniformity. Samples with varyingbuffer layer thicknesses were grown to study the influence ofdislocation related traps on the observed fastphotoluminescence decay. It is found that the fast carriertrapping is predominantly caused by point defects close to theQDs or at the QD/barrier interfaces.
Additional numerical simulations confirm the roles of thetwo independently acting traps in nonradiativerecombination.
Issac, Abey. "Photoluminescence Intermittency of Semiconductor Quantum Dots in Dielectric Environments". Doctoral thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601267.
Texto completoBetrachtet man die Fluoreszenz einzelner Farbstoffmoleküle oder Halbleiternanokristalle bei kontinuierlicher Anregung, so stellt man fest, dass die im Zeitverlauf beobachtete Intensität einer stochastischen Variation unterliegt, d. h. dass das Chromophor zwischen emittierenden und nicht emittierenden Zuständen, auch Hell- und Dunkelzuständen genannt, hin- und herschaltet. Dieses als Blinken bekannte Phänomen ist physikalisch wie auch technologisch herausfordernd, lässt es doch einerseits die Realisierbarkeit einer Reihe von quantenoptischen Anwendungen, so z. B. auf dem Gebiet der Quantenkryptographie, dem Quantum Computing oder der optischen Schaltungstechnik auf Basis einzelner Quantenobjekte, in naher Zukunft möglich erscheinen. Andererseits setzt es gewissen Anwendungen, die auf die permanente Sichtbarkeit des Chromophors aufbauen, Grenzen, so zum Beispiel der Verwendung als Lumineszenzmarker in der medizinischen Diagnostik. Weiterhin ist festzustellen, dass das Blinken kritisch von den äußeren Bedingungen und von den Umgebungsparametern abhängt. Aus diesen und anderen Gründen ist ein fundamentales Verständnis der physikalischen Ursachen und der Wechselwirkungsprozesse unerlässlich. Die Forschung dazu steckt noch in den Kinderschuhen. Basierend auf umfangreiche Messungen der Fluoreszenzzeitreihen einzelner Nanokristalle aus CdSe und CdSe/ZnS in verschiedenen Umgebungen, zeigt diese Dissertation exemplarisch den Einfluss der Dielektrizitätsparameter auf das Blinken. Zur Erklärung des Sachverhalts wird ein so genanntes Self-Trapping-Modell zu Rate gezogen. Demnach kommt es zu einer Ionisation des Quantenobjekts und anschließender Ladungstrennung, woraufhin die abgetrennte Ladung für eine gewisse Zeit in der Umgebung lokalisiert bleibt. Die Dauer der Lokalisierung und damit der emittierenden und nicht emittierenden Perioden hängt von der dielektrischen Funktion des umgebenden Materials ab. Dies ist als direkter Nachweis für den photoinduzierten Ladungstransfer als Ursache des Fluoreszenzblinkens zu deuten. Die Arbeit demonstriert, dass die experimentellen Zeitreihen die charakteristischen Merkmale eines diffusionsgesteuerten Ladungstransferprozesses besitzen und nimmt dabei den gegenwärtigen wissenschaftlichen Diskurs über geeignete theoretische Modelle des Fluoreszenzblinkens auf
Shahid, Robina. "Green Chemical Synthesis of II-VI Semiconductor Quantum Dots". Doctoral thesis, KTH, Funktionella material, FNM, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104980.
Texto completoQC 20121115