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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Field-driven magnetization dynamics of nanoparticles and nanowires /

Lu, Jie. January 2009 (has links)
Includes bibliographical references (p. 154-160).
2

Growth and characterization of metal nanoparticles on nanowire substrates

Lalonde, Aaron David, January 2005 (has links) (PDF)
Thesis (M.S. in materials science and engineering)--Washington State University. / Includes bibliographical references.
3

Nanochemistry, synthesis, characterization and application studies of metal nanoparticles and metalloporphyrin nanowires

So, Man-ho. January 2010 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 270-275). Also available in print.
4

Nanochemistry, synthesis, characterization and application studies of metal nanoparticles and metalloporphyrin nanowires /

So, Man-ho. January 2010 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 270-275). Also available online.
5

Aplikace transmisní elektronové mikroskopie s vysokým rozlišením pro strukturní analýzu nanovláken / Application of high resolution transmission electron microscopy for structure analysis of nanowires

Kachtík, Lukáš January 2016 (has links)
This diploma thesis deals with the structural analysis of semiconductor nanowires by transmission electron microscopy. The construction of microscope is introduced together with its basic imaging modes and with the function of each construction element in these modes. In the experimental part the results of analysis of several germnaium nanowires are discussed, with emphasis on their crystallographic structure and orientation.
6

Absorptive lasing mode suppression in ZnO nano- and microcavities

Wille, Marcel, Michalsky, Tom, Krüger, Evgeny, Grundmann, Marius, Schmidt-Grund, Rüdiger 06 August 2018 (has links)
We conclusively explain the different lasing mode energies in ZnO nano- and microcavities observed by us and reported in literature. The limited penetration depth of usually used excitation lasers results in an inhomogeneous spatial gain region depending on the structure size and geometry. Hence, weakly or even nonexcited areas remain present after excitation, where modes are instantaneously suppressed by excitonic absorption. We compare the effects for ZnO microwires, nanowires, and tetrapod-like structures at room temperature and demonstrate that the corresponding mode selective effect is most pronounced for whispering-gallery modes in microwires with a hexagonal cross section. Furthermore, the absorptive lasing mode suppression will be demonstrated by correlating the spot size of the excitation laser and the lasing mode characteristic of a single ZnO nanowire.
7

Electron Backscatter Diffraction of Gold Nanoparticles / Electron Backscatter Diffraction (EBSD) of Gold Nanoparticles

Zainab, Syeda Rida 11 1900 (has links)
Electron Backscatter Diffraction (EBSD) is a well-developed technique used to perform quantitative microstructure analysis in the Scanning Electron Microscope (SEM); however, it has not been widely applied towards studying nanostructures. This work focuses on the use and limitations of EBSD in the characterization of Au nanoparticles on an MgAl2O4 substrate. Samples under investigation are prepared by depositing a thin film of Au on an MgAl2O4 substrate, and then finally heated in a furnace to induce dewetting and cluster formation. The challenges of obtaining crystallographic information from nanoparticles using EBSD are qualitatively and quantitatively described through an evaluation of the quality of the diffraction pattern at various locations of the primary electron beam on the nanoparticle. It is determined that for a high quality Electron Backscatter Diffraction Pattern (EBSP), the production of diffracted backscattered electrons travelling towards the detector must be high and the depth of the source point must be low. The top of the nanoparticle, where the local geometry of the system is similar to the geometry of a macroscopically flat sample, is found to produce diffraction patterns of the highest quality. On the other hand, reversed-contrast EBSPs are observed when the beam is positioned near the bottom of the nanoparticle. In addition, crystallographic information for each individual nanoparticle is gathered using EBSD. Each individual AuNP is observed to be single crystalline. Finally, the complete ensemble of crystalline orientations for individual nanoparticles is then compared to the global averaged crystallinity of the sample, as measured by X-ray diffraction. These results show that EBSD promises to be a powerful and robust technique in the characterization of nanoparticles. / Thesis / Master of Applied Science (MASc)

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