Titel: Applications of Functional One-Dimensional Nanostructures Studied by Light Scattering
Sprache: Englisch
Autor*in: Glier, Tomke Eva
Schlagwörter: Quantum Confinement; Nanowire Networks; Monte-Carlo Simulations; Spin-Berry Phase; Topological Insulator Nanowires; Surface Enhanced Raman Scattering
GND-Schlagwörter: NanodrahtGND
Topologischer IsolatorGND
Erscheinungsdatum: 2021
Tag der mündlichen Prüfung: 2021-11-15
One-dimensional (1D) nanocrystals represent a versatile and functional class of materials characterized through a high transport efficiency along the long axis, and a confined cylindrical surface. Silver nanowires (Ag-NWs) are excellent building blocks for 2D conductive networks, which are used as functional fillers in 3D printing polymer composites. The morphology of randomly oriented Ag-NWs is studied as a function of concentration, as well as during external modifications and within a polymer matrix by, inter alia, grazing incidence X-ray scattering. Flexible and conductive Ag-NW composites are fabricated and investigated under mechanical stress. Key network properties are revealed by a Monte Carlo based model. The electrical nanowire network, dominated by the tunneling resistances between the nanowires, strongly interacts with the supporting polymer matrix. A 3D-printed flexible capacitor is demonstrated as a prototype for 3D-printed flexible electronic devices. Furthermore, in order to investigate the low-energy excitation spectrum as well as the interaction between the electronic system with lattice degrees of freedom within 1D nanostructures, Raman spectroscopy is utilized. We developed a Raman microscope with ultra-small spot sizes down to 200nm - 300nm to study local phenomena on the nanoscale. Surface enhanced Raman spectroscopy (SERS) is used to study a chemical selective system based on the electronic transitions between semiconducting zinc oxide nanowires and 4-mercaptopyridine. Plasmonic enhancements of the Raman response are observed in nanowires of the topological insulator Bi2Se3 as a function of wire diameter. The modification of the quasi-relativistic surface states by geometrical confinement from 2D to 1D results in a gap opening of the spin-polarized Dirac-states as a consequence of the formation of a Spin-Berry phase.
URL: https://ediss.sub.uni-hamburg.de/handle/ediss/9332
URN: urn:nbn:de:gbv:18-ediss-96917
Dokumenttyp: Dissertation
Betreuer*in: Rübhausen, Michael
Roth, Stephan V.
Enthalten in den Sammlungen:Elektronische Dissertationen und Habilitationen

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