Metal oxide porous single crystals and other nanomaterials : an HRTEM study

Porous materials;Nanocrystals;Nanostructured materials;Transmission electron microscopy;High resolution electron microscopy

Dickinson, Calum ; Zhou, Wuzong ; Zhou, Wuzong

University:University of St Andrews

Department:Chemistry (School of)

关键词: Porous materials;    Nanocrystals;    Nanostructured materials;    Transmission electron microscopy;    High resolution electron microscopy;   

Others  :  https://research-repository.st-andrews.ac.uk/bitstream/handle/10023/217/CalumDickinsonPhDThesis.pdf?sequence=6&isAllowed=y

来源: DR-NTU

【 摘 要 】

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 andsingle 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 wellas 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 oncollaboration, is also presented.