Fabrication and microscopic optical characterization of metal-oxide based nanostructures

To date, low-dimensional metal-oxide nanomaterials have attracted intense interests of a great many researchers. In order to better explore the function of such nanostructures in technological applications, it is necessary to understand their characteristics. Most current researches are based mainly...

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Main Author: Yan, Bin
Other Authors: Shen Zexiang
Format: Theses and Dissertations
Language:English
Published: 2011
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Online Access:https://hdl.handle.net/10356/46309
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-463092023-02-28T23:48:34Z Fabrication and microscopic optical characterization of metal-oxide based nanostructures Yan, Bin Shen Zexiang Yu Ting School of Physical and Mathematical Sciences DRNTU::Science::Physics::Optics and light DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Science::Chemistry::Crystallography::Physical properties of crystals To date, low-dimensional metal-oxide nanomaterials have attracted intense interests of a great many researchers. In order to better explore the function of such nanostructures in technological applications, it is necessary to understand their characteristics. Most current researches are based mainly on ensemble-averaged measurements, where a large number of nanomaterials are studied and the average responses are recorded. These experiments yield only polydisperse-collective effects, which very often are different from the intrinsic or fundamental properties of the nanomaterials. Some unique properties of nanomaterials cannot be observed because of the large variations in particle shape, orientation, size, and surface defects. The main goal of this research is to fabricate and test the physical properties of individual nanostructures. In this dissertation, several metal-oxide nanostructures, V2O5 nanoribbons, MoO3 nanoflakes, ZnO nanowires and Fe2O3 nanoflakes are fabricated via the thermal evaporation method. The physical, especially optical, properties are investigated by the micro-photoluminescence and Raman scattering techniques. Waveguiding effects and morphology-induced anomalous polarized Raman properties are investigated on waveguiding V2O5 nanoribbons. By controlling the orientational arrangement of MoO3 nanoflakes, we demonstrate the anisotropic electrical/optical properties and edge-preferred defect distributions. Local exciton-longitudinal optical phonon interaction in a single ZnO nanowire is suppressed by mechanical deformation. In addition, we proposed a mechanism to elucidate the ultraviolet induced change of surface wettability of ensembled Fe2O3 nanoflakes. DOCTOR OF PHILOSOPHY (SPMS) 2011-11-30T01:42:44Z 2011-11-30T01:42:44Z 2011 2011 Thesis Yan, B. (2011). Fabrication and microscopic optical characterization of metal-oxide based nanostructures. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/46309 10.32657/10356/46309 en 123 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Physics::Optics and light
DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Science::Chemistry::Crystallography::Physical properties of crystals
spellingShingle DRNTU::Science::Physics::Optics and light
DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Science::Chemistry::Crystallography::Physical properties of crystals
Yan, Bin
Fabrication and microscopic optical characterization of metal-oxide based nanostructures
description To date, low-dimensional metal-oxide nanomaterials have attracted intense interests of a great many researchers. In order to better explore the function of such nanostructures in technological applications, it is necessary to understand their characteristics. Most current researches are based mainly on ensemble-averaged measurements, where a large number of nanomaterials are studied and the average responses are recorded. These experiments yield only polydisperse-collective effects, which very often are different from the intrinsic or fundamental properties of the nanomaterials. Some unique properties of nanomaterials cannot be observed because of the large variations in particle shape, orientation, size, and surface defects. The main goal of this research is to fabricate and test the physical properties of individual nanostructures. In this dissertation, several metal-oxide nanostructures, V2O5 nanoribbons, MoO3 nanoflakes, ZnO nanowires and Fe2O3 nanoflakes are fabricated via the thermal evaporation method. The physical, especially optical, properties are investigated by the micro-photoluminescence and Raman scattering techniques. Waveguiding effects and morphology-induced anomalous polarized Raman properties are investigated on waveguiding V2O5 nanoribbons. By controlling the orientational arrangement of MoO3 nanoflakes, we demonstrate the anisotropic electrical/optical properties and edge-preferred defect distributions. Local exciton-longitudinal optical phonon interaction in a single ZnO nanowire is suppressed by mechanical deformation. In addition, we proposed a mechanism to elucidate the ultraviolet induced change of surface wettability of ensembled Fe2O3 nanoflakes.
author2 Shen Zexiang
author_facet Shen Zexiang
Yan, Bin
format Theses and Dissertations
author Yan, Bin
author_sort Yan, Bin
title Fabrication and microscopic optical characterization of metal-oxide based nanostructures
title_short Fabrication and microscopic optical characterization of metal-oxide based nanostructures
title_full Fabrication and microscopic optical characterization of metal-oxide based nanostructures
title_fullStr Fabrication and microscopic optical characterization of metal-oxide based nanostructures
title_full_unstemmed Fabrication and microscopic optical characterization of metal-oxide based nanostructures
title_sort fabrication and microscopic optical characterization of metal-oxide based nanostructures
publishDate 2011
url https://hdl.handle.net/10356/46309
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