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Title: Metal oxide porous single crystals and other nanomaterials : an HRTEM study
Author: Dickinson, Calum
Awarding Body: University of St Andrews
Current Institution: University of St Andrews
Date of Award: 2007
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Three-dimensional porous single crystals (PSCs) are a recent development in the growing world of mesoporous material. The mesoporosity allows for the material to retain their nanoproperties whilst being bulk in size. The current work concentrates on chromium oxide and cobalt oxide PSCs formed in the templates SBA-15 and KIT-6. HRTEM is the main technique used in this investigation, looking at the morphology and single crystallinity of these materials. A growth mechanism for the PSC material is proposed based on HRTEM observations. XRD studies revealed that the confinement effect, caused by the mesopores, reduces the temperature for both cobalt and chromium oxide crystallisation, as well as a different intermediate route from the metal nitrates. The properties of chromium oxide PSC are also investigated magnetically and catalytically. Some metal oxides in different templates are also presented, despite no PSC forming. HRTEM work on other nanomaterials, based on collaboration, is also presented.
Supervisor: Zhou, Wuzong Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: High Resolution Transmission Electron Microscopy ; TEM ; Mesoporous material ; Porous single crystal ; Nanomaterial ; Chromium oxide ; Cobalt oxide ; Nanostructures ; TA418.9N35D5 ; Porous materials ; Nanocrystals ; Nanostructured materials ; Transmission electron microscopy ; High resolution electron microscopy