Formation Mechanism of Porous Single-Crystal Cr2O3 and Co3O4 Templated by Mesoporous Silica
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- 作者：Calum Dickinson ; Wuzong Zhou ; Robert P. Hodgkins ; Yifeng Shi ; Dongyuan Zhao ; and Heyong He
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：June 27, 2006
- 年：2006
- 卷：18
- 期：13
- 页码：3088 - 3095
- 全文大小：642K
- 年卷期：v.18,no.13(June 27, 2006)
- ISSN：1520-5002
文摘
Porous single crystals of Cr2O3 and Co3O4 templated by mesoporous silicas, SBA-15 and KIT-6, havebeen fabricated. Specimens at different stages of crystal growth were characterized by using XRD andhigh-resolution transmission electron microscopy. The final products of oxide porous single crystals werealso characterized by nitrogen adsorption/desorption experiments. A multiseed formation mechanism caneventually be established. The present investigation revealed that the original mesostructures in SBA-15and KIT-6 were negatively replicated by the crystals of oxides, and therefore, the dimension of the buildingblocks (nanorods or nanowires) in the porous crystals of oxides depends on the pore diameter of thesilica. It was also found that a mesopore system, regarded as a nanoreactor, had a significant influenceon the size and morphology of produced oxide particles and on the route and temperature of thecrystallization.