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Дисертації з теми "Nanocrystals of CdTe"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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1

Groß, Dieter. "Charge separation and transfer in hybrid type II tunneling structures of CdTe and CdSe nanocrystals." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-162821.

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Halbleiter-Nanokristalle sind eine besondere Materialklasse in den Nanowissenschaften. Sie sind kleinste Halbleiter-Kristalle, die an ihrer Oberfläche mittels organischer Chemie passiviert wurden. Damit können Sie auf völlig neue Arten produziert, prozessiert und zu größeren hybriden Überstrukturen zusammengesetzt werden. In diesen Nanomaterialien treten neue Effekte insbesondere durch die Größeneinschränkung auf. Es stellt sich vielfach die Frage, welche Eigenschaften von den Halbleiter-Materialien übernommen werden und was alleine aufgrund der geometrischen Größenordnung im Nanometerbereich

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2

Darugar, Qusai A. "Surface effects on the ultrafast electronic relaxation of some semiconductor and metallic nanoparticles." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-06272006-160645/.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2007.<br>Zhang, John, Committee Member ; Wang, Zhong, Committee Member ; El-Sayed, Mostafa, Committee Chair ; Orlando, Thomas, Committee Member ; Lyon, Andrew, Committee Member.

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3

Groß, Dieter Verfasser], and Jochen [Akademischer Betreuer] [Feldmann. "Charge separation and transfer in hybrid type II tunneling structures of CdTe and CdSe nanocrystals / Dieter Groß. Betreuer: Jochen Feldmann." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1045152935/34.

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4

Smith, Andrew Michael. "Engineering semiconductor nanocrystals for molecular, cellular, and in vivo imaging." Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/37124.

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Biomedicine has recently exploited many nanotechnology platforms for the detection and treatment of disease as well as for the fundamental study of cellular biology. A prime example of these successes is the implementation of semiconductor quantum dots in a wide range of biological and medical applications, from in vitro biosensing to in vivo cancer imaging. Quantum dots are nearly spherical nanocrystals composed of semiconductor materials that can emit fluorescent light with high intensity and a strong resistance to degradation. The aim of this thesis is to understand the fundamental physi

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5

Britton, Jonathan. "Photophysical studies of zinc and indium tetraaminophthalocyanines in the presence of CdTe quantum dots." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1004993.

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CdTe QDs capped with mercaptopropionic acid (MPA) and thioglycolic acid (TGA) were covalently linked to zinc and indium tetraaminophthalocyanines (TAPcs) using N-ethyl-N(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxy succinimide (NHS) as the coupling agents. The results presented give evidence in favour of formation of an amide bond between the MTAPc and CdTe QDs. Both the linked ZnTAPc–QD complexes and the mixture of QDs and ZnTAPc (without chemical linking) showed Förster resonance energy transfer (FRET), though the linked showed less FRET, whereas the QD interactions with InTAPc yi

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6

Dimitriev, O., V. Petrenko, Yu Slominski, and I. Mazarchyk. "Formation of J-aggregates of Thiamonomethincyanine Dyes in the Presence of CdTe Nanoparticles." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35442.

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The conditions of formation of J-aggregates for three types of thiamonomethincyanine dyes, whose structure is differed by end groups, are studied depending on their concentration and type of interaction with CdTe nanoparticles with size of about 3 nm in aqueous dispersions. The influence of dye structure on the efficiency of formation of J-aggregates in solutions and in films was found. It was found that quantum dots (QDs) of CdTe stabilized by thioglycolic acid can adsorb J-aggregates of the dye molecules on their surface. It was shown for the first time that the hybrid structure of dye-

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7

Emara, Mahmoud M. "Reducing Threshold of Biexciton Formation in Semiconductor Nanocrystals through Their Self-Assembly into Nano-Antennae." View abstract, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3315062.

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8

Bastola, Ebin. "CdTe Back Contact Engineering via Nanomaterials, Chemical Etching, Doping, and Surface Passivation." University of Toledo / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1596813646708798.

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9

ROSINA, IRENE. "Exploiting Cation Exchange Reactions in Doped Colloidal NIR Semiconductor Nanocrystals: from synthesis to applications." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1019427.

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Colloidal quantum dots (CQDs) have tunable optical properties through manipulation of their size, shape, and surface chemistry. Among pholuminescent QDs, near-infrared (NIR) emitting ones are of particular interest since they can be used in several applications, from the labeling in living tissues, to the integration in commercial optoelectronic devices, like photovoltaics for solar energy conversion or photodetectors from visible to the near-infrared and mid-infrared. In addition, the exciting promise of CQDs is that is associated with easy and low-cost device fabrication process. In fact, so

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10

Dias, Eva. "The photophysics of CdSe/ZnS/CdSe core/barrier/shell nanocrystals: light harvesting, single nanocrystal blinking, and optical gain." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107729.

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This thesis investigates the photophysical properties of CdSe/ZnS/CdSe core/barrier/shell nanocrystals using a combination of steady state and time resolved spectroscopy. Interestingly, these materials exhibit photoluminescence (PL) from both the CdSe core and CdSe shell, which can be exploited for a variety of applications, such as white light emission and optical gain. Steady state measurements shed light on the coupling between the two CdSe phases. The CdSe shell is shown to have a significant influence upon the optical properties of the CdSe core. In fact, the CdSe shell acts as a light ha

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11

Ginger, David Stanton. "Optoelectronic properties of CdSe nanocrystals." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621187.

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12

Nirmal, Manoj. "Photophysics of cadmium selenide (CdSe) semiconductor nanocrystals." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10715.

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13

Sutton, Rebecca Suzanne. "Dual-emitting Cu-doped ZnSe/CdSe nanocrystals." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19047.

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Master of Science<br>Department of Chemistry<br>Emily McLaurin<br>Cu-doped ZnSe/CdSe core/shell nanocrystals were synthesized using the growth doping method. Upon shell growth, the nanocrystals exhibit dual emission. The green luminescence peak is assigned as band edge emission and the broad, lower energy red peak is due to Cu dopant. Although, the oxidation state of Cu in the nanocrystals is debated, the emission is explained as recombination of a hole related to Cu²⁺ with an electron from the conduction band. The emission changed in the presence of dodecanethiol. Generally, the band edge emi

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14

Marx, Eike. "Self-assembly of CdSe nanocrystals for molecular electronics." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616244.

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15

Chung, Inhee 1976. "Understanding and engineering the photophysics of single CdSe nanocrystals." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17733.

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Анотація:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2004.<br>Vita.<br>Includes bibliographical references.<br>This 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 specific optical properties of QDs to be applied in various ways. For example, through the study of the emission polarization of single QDs a 2D transition polarization

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16

Fisher, Brent R. "Time resolved fluorescence of CdSe nanocrystals using single molecule spectroscopy." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33649.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2005.<br>Vita.<br>Includes bibliographical references.<br>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 behavior of individual NCs to be resolved from the blurring effect of averaging over the ensemble. Studies of the excited state lifetime of band edge fluorescence from si

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17

Sheremet, E., A. G. Milekhin, R. D. Rodriguez, et al. "Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-161500.

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Surface- and tip-enhanced resonant Raman scattering (resonant SERS and TERS) by optical phonons in a monolayer of CdSe quantum dots (QDs) is demonstrated. The SERS enhancement was achieved by employing plasmonically active substrates consisting of gold arrays with varying nanocluster diameters prepared by electron-beam lithography. The magnitude of the SERS enhancement depends on the localized surface plasmon resonance (LSPR) energy, which is determined by the structural parameters. The LSPR positions as a function of nanocluster diameter were experimentally determined from spectroscopic micro

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18

Weaver, Joseph Edison. "PATTERNING OF CADMIUM SELENIDE QUANTUM DOT NANOCRYSTALS FOR USE WITH PHOTOVOLTAIC APPLICATIONS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/976.

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Анотація:

In this thesis, cadmium selenide (CdSe) quantum dots (QDs) are synthesized and characterized for patterning applications as well as for photovoltaic devices. The QDs were patterned and embedded into various polymers to form fluorescent composites. Their photophysical properties were investigated in detail. Through template assisted deposition the QDs-polymer composites were patterned into fluorescent nanorods. CdSe QDs were combined with multi-wall carbon nanotubes (CNTs) using a synthesized organic perylene derivative dye (N,N'-di(ethanethiol)-perylene-3,4,9,10-tetracarboxyl diimide) (ETP

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19

Toyama, Fumiaki 1977. "Interband and intraband optical studies of CdSe colloidal nanocrystal films." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28653.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.<br>Includes bibliographical references (p. 51-53).<br>We present 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 treated with sodium biphenyl. Bleaching of the visible interband transition is observed upon electron injection into the nanocrystal films. It is expect that, with

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20

Woo, Wing-Keung 1972. "Fabrication and characterization of quantum-confined optoelectronic devices based on CdSe nanocrystals." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8176.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2002.<br>Includes bibliographical references.<br>Colloidal semiconductor quantum dots (QDs), or nanocrystals (NCs), are the subject of intense research for their novel size dependent optical and electronic properties. Since the development of 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 enhanc

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21

Anwar, Monib. "Effect of X-ray Irradiation on the Blinking of CdSe/ZnS Nanocrystals." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-227966.

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Different semiconductor nanocrystals exhibit size dependent properties due to confinement effect. Light emission from these nanocrystals may turn ON and OFF seemingly at random, an effect known as blinking. In this work blinking studies have been done to monitor the effect of X-ray exposure and to investigate the radiation hardness of CdSe/ZnS QD’s. Correct parameters to dilute and spin-coat the obtained sample were found to get access to individual single dots. Blinking of these dots was analyzed using Image J and MATLAB plug-in, where ON and OFF-times distribution power exponents Mon and Mof

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22

Pavlopoulos, Nicholas George, and Nicholas George Pavlopoulos. "Designing Selectivity in Metal-Semiconductor Nanocrystals: Synthesis, Characterization, and Self-Assembly." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/626149.

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This dissertation contains six chapters detailing recent advances that have been made in the synthesis and characterization of metal-semiconductor hybrid nanocrystals (HNCs), and the applications of these materials. Primarily focused on the synthesis of well-defined II-VI semiconductor nanorod (NR) and tetrapod (TP) based constructs of interest for photocatalytic and solar energy applications, the research described herein discusses progress towards the realization of key design rules for the synthesis of functional semiconductor nanocrystals (NCs). As such, a blend of novel synthesis, advance

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23

Malfavon-Ochoa, Mario, and Mario Malfavon-Ochoa. "Characterization of Semiconductor Nanocrystal Assemblies as Components of Optoelectronic Devices." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625902.

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This dissertation presents new insight into the ability of small molecule passivated NCs to achieve intimate approach distances, despite being well passivated, while developing guiding principles in the area of ligand mediated microstructure control and the resulting macroscopic optical and electronic properties that close packing of high quality NCs enables. NC ligand coverage will be characterized quantitatively through thermogravimetric analysis (TGA), and qualitatively by photoluminescence and electroluminescence, in the case of functional devices; illustrating the importance of practitio

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24

Sewall, Samuel Lewis. "Investigations of charge carrier complexes in CdSe nanocrystals using state-selective ultrafast spectroscopy." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86670.

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This thesis is about the use of exciton selective ultrafast spectroscopic techniques in investigations of state-to-state dynamics and biexcitonic interactions in CdSe nanocrystals (NCs). Close to the band edge the electronic states are well-defined spectrally, and can be excited using different pump pulse wavelengths generated using tunable optical parametric amplifiers (OPAs). In chapter 3 the response of nanocrystals samples when excited into the three lowest energy states is compared with traditional UV excitation. This reveals how powerful state-selective techniques are in measurement

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25

Chen, Xiaobo. "Synthesis and Investigation of Novel Nanomaterials for Improved Photocatalysis." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1117575871.

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26

Yuan, Ying [Verfasser], and Michael [Akademischer Betreuer] Krüger. "Colloidal CdE (E= S, Se and Te) nanocrystals: from synthesis to applications." Freiburg : Universität, 2016. http://d-nb.info/1122831633/34.

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27

Tschirner, Norman Verfasser], and Christian [Akademischer Betreuer] [Thomsen. "Raman spectroscopy of ß-carotene and CdSe-based nanocrystals / Norman Tschirner. Betreuer: Christian Thomsen." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1018764976/34.

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28

Herz, Erik. "Colloidal Semiconductor Nanocrystals: A Study of the Syntheses of and Capping Structures for CdSe." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/10147.

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Luminescent quantum dots (QDs) or rods are semiconductor nano-particles that may be used for a wide array of applications such as in electro-optical devices, spectral bar coding, tagging and light filtering. In the case under investigation, the nano-particles are cadmium-selenide (CdSe), though they can be made from cadmium-sulfide, cadmium-telluride or a number of other II-VI and III-V material combinations. The CdSe quantum dots emit visible light at a repeatable wavelength when excited by an ultraviolet source. The synthesis of colloidal quantum dot nanoparticles is usually an organo-metall

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29

Xu, Yang. "Synthesis and Characterization of Silica Coated CdSe/CdS Core/Shell Quantum Dots." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29974.

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A great deal of interest has been dawn on the colloidal chemistry based semiconductor 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 semiconductor QDs ideal candidate for next-generation of bio-labels and drug delivery vehicles. This report presents a user friendly approach to synthesize high quality biocompatible CdSe QDs in aqueous solution. Size of

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30

Kumar, Krishan [Verfasser]. "Electrical, Optical and Structural Properties of CdSe Nanocrystals coupled to Organic π-systems / Krishan Kumar". Tübingen : Universitätsbibliothek Tübingen, 2021. http://d-nb.info/1226756034/34.

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31

Manceau, Mathieu. "Single CdSe/CdS dot-in-rods fluorescence properties." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066362/document.

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Les nanocristaux colloïdaux synthétisés par voie chimique sont des sources prometteuses de lumière non-Classique à température ambiante. Ce travail est consacré à l'étude des propriétés optiques d'un type particulier de nanocristaux colloïdaux, appelé coeur-Bâtonnet, dans lequel un noyau de Seleniure de Cadmium (CdSe) sphérique est entouré d'une coquille de Sulfure de Cadmium (CdS) de forme cylindrique. En étudiant des particules de type coeur-Bâtonnet à température ambiante avec un microscope confocal, une caractérisation complète des propriétés optiques de ces émetteurs est réalisée. Nous ét

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32

Hering, Vitor Renaux. "Interação entre proteínas fluorescentes e nanocristais de CdSe/ZnS." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-15082007-074551/.

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Foram utilizadas proteínas da famÌlia das GFPs e nanocristais fluorescentes de CdSe/ZnS para caracterização da interação e verificação de transferência de energia por ressonância (FRET) entre estes compostos. Formou-se dois pares doador-receptor onde ora uma proteína figurava como doadora, ora um nanocristal ocupava este papel. Verificou-se que, em ambos os casos, o doador sofre supressão da fluorescência após a formação de complexo com o receptor, complexo este motivado por interação eletrostática e dependente de pH. Foi possível comprovar, através da observação de emissão sensitizada

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33

Siebers, Benjamin [Verfasser], Dmitri R. [Akademischer Betreuer] Yakovlev, and Heinz [Gutachter] Hövel. "Spectroscopy of excitons in CdSe/CdS colloidal nanocrystals / Benjamin Siebers. Betreuer: Dmitri R. Yakovlev. Gutachter: Heinz Hövel." Dortmund : Universitätsbibliothek Dortmund, 2015. http://d-nb.info/1101606290/34.

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34

Shen, Yaoming. "Photoluminescence spectral study of single CdSe/ZnS Colloidal Nanocrystals in Poly(methyl methacrylate) and Quantum Dots molecules." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3304209.

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Анотація:

Thesis (Ph. D.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed June 17, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 91-99).

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35

Smirnova, T. N., J. Stumpe, О. V. Sakhno, L. M. Kokhtych, and P. V. Yezhov. "Stimulated emission of CdSe/ZnS nanocrystals in polymer dfb structure obtained by holographic ordering of polymer nanocomposite." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20586.

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36

Shallcross, Richard Clayton. "CHARACTERIZATION OF THE SIZE-QUANTIZED ELECTRONIC AND OPTICAL PROPERTIES OF CdSe NANOCRYSTALS FOR APPLICATIONS IN PHOTOCATALYSIS, SOLAR CELLS AND DIFFRACTION GRATINGS." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194710.

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Анотація:

This dissertation presents novel applications of ligand-capped II-VI semiconductor nanocrystals (i.e. CdSe and CdTe).Hybrid polymer-nanocrystal thin films were prepared using a bottom-up electrochemical crosslinking method, where thiophene-functionalized CdSe NCs were wired to electron-rich 3,4-dioxy-substituded thiophene polymers. Both nanocomposite and effective monolayer (EML) films were achieved by controlling monomer feed ratios during the crosslinking steps. These hybrid thin films showed enhanced photoelectrochemical current efficiencies with a variety of solution acceptor molecules c

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37

Nemchinov, Alexander. "Using Colloidal Nanocrystal Matrix Encapsulation Technique for the Development of Novel Infrared Light Emitting Arrays." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339806993.

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38

Khastehdel, Fumani Ahmad. "QUANTUM CONFINED STATES AND ROOM TEMPERATURE SPIN COHERENCE IN SEMICONDUCTOR NANOCRYSTAL QUANTUM DOTS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1449151739.

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39

Dickerson, Bryan Douglas. "Organometallic Synthesis Kinetics of CdSe Quantum Dots." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27322.

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Анотація:

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 absorbance spectroscopy, in order to characterize synthesis kinetics in stearic acid, dodecylamine, and in trioctylphosphine oxide. The nucleation rate increased with Se concentration, while the growth rate followed the Cd concentration. Emission peak widths, emission redshift rates, nanocrystal gr

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40

Graham, Amy L. "Characterization of Heterojunctions via X-Ray and UV Photoemission Spectroscopy: Energy Level Implications for Single and Mixed Monolayer SAMs, CdSe Nanoparticle Films, and Organic Semiconductor Depositions." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195913.

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This work has centered on the interface dipoles arising at heterojunctions between metals, semiconductor nanoparticles, self-assembled monolayers, and organic semiconductor materials. Alkanethiol self-assembled monolayers, CdSe nanocrystals, and the organic semiconductors zinc phthalocyanine (ZnPc) and Buckminster fullerene (C60) were the basis of these investigations. UV photoemission spectroscopy has proven to be an invaluable tool to observe the vacuum level shifts for these analyses while using XPS to corroborate surface structure. With a full evaluation of these surfaces, the shifts in t

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Weeks, Nathan John. "Efficient Computation of Quantum Dot Properties| Application of Modified Charge Equilibration to Large Inclusive Sets of Wurtzite CdSe Nanocrystal Structures." Thesis, University of Colorado Colorado Springs, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13423566.

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<p> Semiconducting quantum dots (QDs) exhibit tunable size dependent properties, leading some to designate these materials as “artificial atoms”. Synthetic methods of CdSe QDs have been highly refined and typically involve one-pot seeding and growth, resulting in the generation of colloidal crystallites ranging in diameter from ~1nm to ~6nm and with size distributions as low as 10%. Several reports describe the observation of “magic size” QDs during the early stages of growth, characterized by a stepwise increase in QD size—as opposed to the typically-observed con

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42

Al-Brasi, Enteisar. "The growth and characterization of films of noble metal nanocrystals and inorganic semiconductors at the interface of two immiscible liquids." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-growth-and-characterization-of-films-of-noble-metal-nanocrystals-and-inorganic-semiconductors-at-the-interface-of-two-immiscible-liquids(5652496a-6e6d-4e91-a21b-6ae1b3f36a87).html.

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Deposition of noble metal and semiconductor nanocrystalline thin films has received much attention. CdS and CdSe are important semiconductors used in optical devices. A wet chemical route which uses the interface of two immiscible liquids to control the growth and deposition of nanocrystalline thin films forms the basis of the current study. In this method, a metal precursor dissolved in toluene or decane is held in contact with a water layer containing a reducing or sulphiding agent. The reaction proceeds at the interface of the liquids and results in deposits adhering to the interfacial regi

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Sinito, Chiara. "Propriétés magnéto-optiques de nanocristaux de CdSe individuels à basse température." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0282/document.

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Les applications émergentes des nanocristaux de CdSe nécessitent une compréhension approfondie des propriétés d’émission et de relaxation des sous-niveaux de structure fine de l’exciton de bord de bande. Cette thèse porte sur l’étude spectroscopique de nanocristaux individuels de CdSe présentant une photostabilité remarquable aux températures cryogéniques. La distribution spectrale de leur photoluminescence en fonction de la température et d’un champ magnétique appliqué fournit une signature précise des niveaux de plus basse énergie, révélatrice de leur morphologie et leur structure cristallin

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Biadala, Louis. "Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00654493.

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Les nanocristaux de CdSe font l'objet d'applications émergentes dans les domaines de la nanoélectronique, des technologies laser ou du marquage fluorescent de biomolécules. Pour ces applications, la détermination de la structure fine de l'exciton de bord de bande et des mécanismes de relaxation entre sous-niveaux est d'un intérêt majeur. Cette thèse a été consacrée à l'étude spectroscopique à basse température et sous champ magnétique de nanocristaux individuels de CdSe/ZnS. La remarquable photostabilité des nanocristaux étudiés a permis de caractériser les propriétés optiques des deux états

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Riehle, Frank S. Verfasser], and V. Prasad [Akademischer Betreuer] [Shastri. "The rational synthesis of defect-free CdE (E=S,Se) nanocrystals : from precursor reactivity to surface stability = Über die rationale Darstellung von defektfreien CdE (E=S,Se) Nanokristallen : von der Reaktivität der Präkursoren bis zur Oberflächenstabilität." Freiburg : Universität, 2013. http://d-nb.info/111549452X/34.

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46

Sheremet, Evgeniya. "Micro- and Nano-Raman Characterization of Organic and Inorganic Materials." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-188175.

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Die Raman-Spektroskopie ist eine der nützlichsten optischen Methoden zur Untersuchung der Phononen organischer und anorganischer Materialien. Mit der fortschreitenden Miniaturisierung von elektronischen Bauelementen und der damit einhergehenden Verkleinerung der Strukturen von der Mikrometer- zur Nanometerskala nehmen das Streuvolumen und somit auch das Raman-Signal drastisch ab. Daher werden neue Herangehensweisen benötigt um sie mit optischer Spektroskopie zu untersuchen. Ein häufig genutzter Ansatz um die Signalintensität zu erhöhen ist die Verwendung von Resonanz-Raman-Streuung, das heißt

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47

Trenkmann, Ines. "Mikroskopie und optische Spektroskopie an heterogenen Nano- und Mikrostrukturen: Halbleiter-Nanokristalle, molekulare Farbstofffilme und funktionalisierte Hybridstrukturen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-175178.

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In dieser Arbeit wird die Abhängigkeit der Photolumineszenz (PL) von CdSe/ZnS-Nanokristallen von der Umgebung und der Einfluss der Filmdicke und -morphologie auf die optische Absorption von Farbstofffilmen untersucht sowie die Oberfläche von Hybridstrukturen durch Funktionalisierung mit Farbstoff analysiert. Untersuchungen von CdSe/ZnS-Nanokristallen in Toluol-Lösung zeigen, dass die PL-Intensität der Nanopartikel durch Zugabe des organischen Halbleiters TPD gequencht wird. Die zusätzliche Auswertung der PL-Lebensdauer verdeutlicht, dass die Abnahme (fast) vollständig durch statisches Quenchen

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Krasselt, Cornelius. "Dynamik der Photo-Lumineszenz-Unterbrechung von Halbleiter-Nanokristallen in elektrischen Feldern." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-172910.

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Diese Arbeit untersucht die Photo-Lumineszenz (PL)-Unterbrechung (Blinken) einzelner in Polymer-Nanopartikeln eingebetteter CdSe/CdS Halbleiter-Nanokristalle (Quantenpunkte) im Einfluss elektrischer Gleich- und Wechselfelder mittels Weitfeld-Mikroskopie. Hierbei emittieren die einzelnen Quantenpunkte trotz kontinuierlicher Anregung mit einer zwischen hellen An- und dunklen Aus-Zuständen variierenden PL-Intensität. Die Ergebnisse zeigen, dass die Dynamik dieses Blinkens durch Wechselfelder stark beeinflusst wird und von deren Feldstärke, teilweise auch deren Feldfrequenz abhängt. Für zunehmende

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Grimes, 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.

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The American Cancer Society predicts that 1,665,540 people will be diagnosed with cancer, and 585,720 people will die from cancer in 2014. One of the most common types of cancer in the United States is skin cancer. Melanoma alone is predicted to account for 10,000 of the cancer related deaths in 2014. As a highly mobile and aggressive form of cancer, melanoma is difficult to fight once it has metastasized through the body. Early detection in such varieties of cancer is critical in improving survival rates in afflicted patients. Present methods of detection rely on visual examination of suspici

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Koo, Bonil. "CdTe/CdSe/CdTe heterostructure nanorods and I-III-VI₂ nanocrystals: synthesis and characterization." 2009. http://hdl.handle.net/2152/7851.

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Semiconductor nanocrystals are interesting candidates as new light-absorbing materials for photovoltaic (PV) devices. They can be dispersed in solvents and cheaply deposited at low-temperature on various substrates. Also, the nanocrystals have unique optical properties depending on their size due to the quantum size effect and moreover it is easy to uniformly control their stoichiometry. CdTe/CdSe/CdTe heterostructure nanorods and I-III-VI₂ nanocrystals were selected to synthesize and investigate in order to utilize the benefits of colloidal nanocrystals described above. Colloidal nanorods wit

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