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Title: Synthesis, characterisation and properties of nanostructured materials
Author: Ho, G. W.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2006
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Synthesis of controlled quality and quantity of nanostructured materials form the basis of future nanotechnology building blocks. The understanding of fundamental properties, creation of complex hierarchical nanostructured materials and development of nanotechnologies are research areas which follow closely after the synthesis of nanomaterials. First and foremost, the key growth parameters of vapour-phase synthesis were identified so as to control the growth of nanomaterials with desired physical dimensions and chemical compositions. The synthesized nanomaterials were characterised using various chemical and structural analysis techniques in a complementary fashion. In addition, various self-assembly growth techniques were used to engineer the growth of complex nanostructures. The use of lithography; photolithography and ion beam lithography to generate micro to nano dimension catalyst patterns proved to be a valuable guide for selective growth of nanowires, whilst the use of zinc oxide polyhedron crystals and grain-boundary textured Cu templates have successfully produced a variety of interesting hierarchical nanostructures. Essentially, the templates act as a structure directing medium to intercede the growth in a confined manner. Success in the growth of one-dimensional single-crystal nanowires is the focus of interest since they offer the potential to answer fundamental questions about the effect of dimensionality on physical properties and are expected to play a central role in applications ranging from molecular electronics to scanning microscopy probes. Finally, with the availability of nanostructures in desirable crystal structures and chemical compositions, studies on their physical properties and phenomena were performed. Interesting properties such as the wettability and electrical properties were investigated. In particular, silicon carbide nanowire flowers show remarkable surface hydrophobicity and elasticity attributed to the unconventional multi-directional assembly of nanowires. The zinc oxide nanowires, on the other hand, exhibit superior electrical conductivity due to their clean surfaces and perfect crystallinity nature.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available